Very powerful amplifier that will drive any speaker with authority. 00 Nov 28, 2013 · I have a pair of 3. Tom offers a Triode couple (45w) or Pentode coupled (75w) amp but no switch because the switch forces a compromise of one of the circuits. I tested the amp with both UL and pentode configurations and preferred UL, so I'd like to stick with it. Design and construction of a pair of push-pull class-A, Ultra-Linear Mono Block Tube Amplifiers that can be used with several different power vacuum tubes including EL34, KT77, 6L6GC, 6550, KT88, KT90. All internals are point to point wiring. I had this installed in a project, but tore it down to build something else. Nov 10, 2019 · The Cranberry tube amplifier can be used with pentode or beam power vacuum tubes like 6L6GC, EL34, KT77, KT88 and KT120. 0. Cayin CS-88A KT88 Tube Amplifier "Experience Unmatched Sound with Cayin Tube Amplifiers"Upgrade your audio setup with the best in the business. ULTRA-LINEAR OPERATION, also known as DISTRIBUTED LOAD OPERATION, is a term when applied to single-ended or push-pull vacuum tube audio amplifiers, that describes the particular output stage configuration whereby the Screen Grids (Grid 2) of Tetrodes, Pentodes or Beam Power Tubes are fed from a tapping in the output transformer (single-ended) or HiFi-Amplifier Audiophile online store REISONG Boyuu MT-88 MKII KT88*4 tube Amp Push-pull Hi-Fi Audio Amplifier Upgraded Version [BoyuuRange MT-88 MKII] - REISONG Boyuu MT-88 MKII KT88*4 tube Amp Push-pull Hi-Fi Audio Amplifier Upgraded Version 100% original factory and brand new Product technology:Handmade scaffolding welding, there is concise and easy process, traces short, simple upgrade Apr 15, 2010 · The other question is about the ultra-path like cap (C1 || C5) on the output. The McIntosh MC275 is a pure pentode circuit for either KT88 or 6550 tubes. Broskie raises some concern about noise performance of the ultra-path topology (link below). The ultra-linear circuit is recommended for outputs up to 100M" when the maximum output coupled with the May 28, 2021 · 45W+45W (RMS ultra-linear working state) (KT88, 6550EH) 40W+40W (RMS ultra-linear working state) (EL34) Preamp stage power supply filtering Tube: 6SN7*1 Voltage amplifier stage Tube: 6SL7*2 Driver stage Tube: 6SN7*2 Power vacuum tube: KT88*4 or 6550EH*4 or EL34*4 (only 1 kind of power tube come, you need to choose) Apr 7, 2021 · The staring point of the project was the design by Bob Cordell (C70) that was published on Linear Audio. I think it weighs 65 pounds or so. On good recordings you will hear height and… YaQin MS-90B Push-Pull Tube Amplifier HIFI EXQUIS Lamp Amps Swith Triod and Ultra-Linear AMP Rear Stage Remote With Bluetooth4. Power output for the triode mode is 30 watts, and for ultralinear, it is 45 watts per channel. B Small (noval base) power tubes for 10 to 15 Watt amps. In ultra-linear mode, the sound is open, exuberant, and powerful, ideal for appreciating large-scale, dynamic For sale is an OT for a bass amp (or really big guitar amp). It has 4 balanced line inputs and 4/8Ω output groups. With an anode to anode load of 4,000 Ohms and 550 Volts on the anode a pair run in ultra linear AB1 will deliver 100 Watts at 3. I decided to use new tubes (JJ) and new toroidal transformers (Toroidy from Poland). May 9, 2007 · "The GEC Audio Tube Data book reprint has a circuit for a 100 watt fixed-bias KT88 ultra-linear amplifier. Mar 22, 2019 · Cayin CS-55A KT88: triode mode and ultra-linear mode . High voltage power transformer and Jan 17, 2007 · Both the KT88 & 6550 are often used in the ultra-linear configuration for power amps because, I understand that, these 2 tubes (not the only ones, mind you!) are physically constructed such that the above mentioned percentages can be obtained. Class A push-pull power amplifier to reduce distortion; 17. [1] Jun 23, 2021 · User-selected amplifier modes, UT (Ultra linear) mode provides greater output power and TR (Triode) mode does smooth and rich sound. EL34 6CA7 6550 KT88 KT90 Feb 14, 2021 · I am currently running Art Audio Opus 4s with KT120s (also runs KT88s) and I love them. Ultra-linear connected OPT. Great frequency extension and bass control. Categories: Amplifiers; Year For those building their own amplifiers from scratch, these output transformers are suitable for single-ended amplifiers that use an output valve such as a 6L6GC, EL34, 6CA7, KT88, and 6550. Classic looking, great sounding. This allows you to get 9 to 11 watts in SET mode, depending on what power We built the Canary Audio M50 power amplifier around four KT88 tubes under an ultra-linear circuit that could provide 50 watts of subtly textured music. UTC Linear Standard Amplifier 20W 1956 - Williamson Upgrade (Click on link to open page) 18. A High-Quality Tube Amplifier: Despite its affordable price, the Yaqin MC-84L amplifier is a remarkable audiophile-grade ultra-linear push-pull, full Class A tube amplifier. This state-of-the-art machine boasts forty watts per channel by using 4 KT88 tubes in Class AB ultra-linear push pull amplification. Heath W4-AM Single-Chassis 20W Ultra-linear Williamson Amplifier (Click on link to open page) 20. A small feedback is ised: 5dB (triode mode ) or 9dB (ultra linear mode ). Instead of the original full-wave bridge rectifier for the B+ power supply, Mr. B+ using Cree schottky diodes (bridge) and a power transformer from ebay China that supplies 550vac @ 750ma (and 3x6. This amplifier can be fitted with 6550, KT88, KT90, or KT120 output tubes (some use different bias). 5k SE ultra linear Edcor output transformers that I would like to build a SE KT66 amplifier with. However, looking at the KT88 datasheet it seems this tube might be most comfortable with 2. Why not ultra-linear? The transformers from the old amplifier I used did not have ultra-linear taps on them – simple as that. Here's the schematics Mar 4, 2023 · Buy Queenway AB1-KT88I Integrated Vacuum Tube Amplifier Psvane KT88*4 32/50W*2 Triode Ultra Linear Mode Converter Remote 110V/220V (220V): Tubes - Amazon. simple circuit diagram explained for KT88 SE amplifier, FLUXION audio technology. Jun 11, 2007 · Alex has put together a single ended (SE) KT88 tube amp. Now i'm looking for good schematic in order to build SE amp (hi-fi) with the following parameters: up to 6-10 Watts per channel, KT88 or EL34 tubes, ultralinear application. A remote control switches the amp from ultra-linear to triode operation. com FREE DELIVERY possible on eligible purchases Oct 25, 2022 · Uploaded a short video about the 2nd harmonics on this mighty KT88. 9K with cathode feedback connected). O. com sales@raysonicaudio. This results in a harmonically decaying spectrum. 5 inches wide by 12 inches deep by 8 inches high Weight: 33 pounds Our KT88 SE Stereo Amplifier has lower distortion than a SE triode amp. The KT88 mav be used in pairs in either triode, pentode or ultra-linear push-pull circuits and this Supplement gives circuits and operating data for amplifiers giving outputs of 30 to 400 v,ratts in various conditions of operation. "Can anyone help me locate this cct? Or even a similar cct runing KT88s with 560V on the plates. A more highly developed design is shown in the GEC KT88 400W Amplifier. DIY Single-Ended (SE) KT88 Tube Amplifier The photos below are of Bernardo's DIY Single-Ended KT88 Tube Amplifier following Mikael Abdellah's schematic. Jun 25, 2020 · First, when changing output modes (Triode vs Ultra-Linear) while the amplifier is on, you can expect a clicking sound. Together with Triode and Ultra-linear dual mode selection, the HA-6A offers a lot of sound signature options in one compact chassis. But I can hear the benefits of Triode mode with small ensemble acoustic instruments and vocals. And finally I can afford to be one. They don't offer a switch. Aug 19, 2024 · I have built a KT88 SE amplifier but I am having trouble to get the feedback circuit to work. Alex has made some changes, such as the ability to switch the amplifier between triode and ultra-linear operation. . The amp’s bottom end can be turned down by changing the KT88 tubes to more linear KT34 tubes. May 30, 2021 · YAQIN MC-100B KT88 HiFi Vacuum Tube Push Pull Integrated Amplifier, HIFI Valve Tube Pure Amplifier, 110V/220V, RCA Jack x 4 Input, 50Wx2 / 25Wx2 Output, KT88/6N8P/12AX7B tube AMP (Silver) 5. amplifier. 0 - Yaqin - YaQin MS-90B Push-Pull Tube Amplifier - Label: New - Category: Tube Amplifier - Price: $ 1116. Class A push-pull power amplifier to reduce distortion; 3. Running the pair of EL34 tubes places the focus on that seductive midrange, with an overall softer and more intimate feel top to bottom. Before making the modification, I recommend making sure there is no music playing and that the level is a bit lower. I have questions about the transfos, I think the 1605P from hammond should be ok for each channel but what about the output transfo? Jan 14, 2019 · X7 KT88 x4 Vacuum Tube Integrated Amplifier Push-Pull Power Amp MM Phono Tube Amplifier Balanced XLR 2022 Remote WiiM Ultra Multiroom Music Streamer | Compatible The CS-55A is the most recent advancement in tube amplifier technology created by Cayin. and 50-watts per channel in triode mode. To sum up it's a good amp, yes I'm pleased I bought one & would buy another, but I guess I would have to say that in Ultra linear mode it seems TWhen Rudolf Moers discovered tube amplifiers, he could not find a good book that explained various concepts like the Ultra-Linear circuit, from a theoretical as well as a practical perspective. The amplifier stage is based on the Compact Hi-Fi Power Amplifier by Melvin Leibowitz. However there's a bump of 50Hz around -60dB generated out from the AC powered filaments and I am still thinking how to throw it away without rectifying it. The KT88 is a commercial version of the CV5220 and is similar to the The new dual-mode Cayin Audio CS-100A tube amplifier. Jun 18, 2017 · Ultra linear was designed to use the output transformer's additional windings to send local feedback to the output tubes - sort of halfway house between a triode and a pentode - I like ultra linear - since to me output stage triode is borderline with snake-oil - ultra linear is a very good compromise. Nov 30, 2009 · The Oddblock amplifier kits can be purchased directly from OddWatt Audio. User-selected amplifier modes, UT (Ultra linear) mode provides greater output power and TR (Triode) mode does smooth and rich sound. Mode Layout. The new KT88 is a pentode with a higher anode-plus-screen dissipation of 40 Watts, and a higher Oct 9, 2020 · YaQin MC-100B can use like a pure power tube amplifier or also an integrated tube amplifier, User-selected amplifier modes, UT (Ultra linear) mode provides greater output power and TR (Triode) mode does smooth and rich sound, Provides user adjustable bias, test points to refine bias of the output tubes. May 20, 2010 · Valves for audio amplifiers are categorised into three primary groups. The transformer spec. Finish: Two Tone Brown. When you switch it to EL34 mode, you can also use EL37, 6CA7, 6L6GC, 5881, KT77 and KT66. Two valves in Class AB1 give a continuous output of up to 100W. Triode and ultra-linear selection are available which can be switched by the button on the amplifier The KT88 is one of the few classic audio output valves. May 28, 2010 · The Lenard Ultra-linear 100 Watt / channel amp had Bias calibration for each KT88 KT88s from a B+ 560V DC supply should not be biased less than 40mA and no higher than 60mA. ” I would totally concur with that. Sep 10, 2014 · My favorite selction of tubes for this amp are an Amperex Bugle Boy 6DJ8 (in place of the 6N1P) and Siemens EL34 on triode mode. In particular, ultra-linear amplifiers delivered excellent transient response from simple power supplies. Features: —Pure hand-made, the whole machine is welded with scaffolding. f. Pure hand-made, Point to point manual welding. The amplifier circuit is biased into Class-A, ultra-linear operation and output power will be dependent on the tubes utilized. Later circuits used 39K. SE KT88 Tube Amplifier Schematic (6N1P driver) by Mikael Abdellah - (Photographs) SE KT88 Tube Amplifier Schematic with 12AX7 driver - Jean Hiraga; SE 6550 Tube KT88 a. Rated Output Power:13Wx2（Ultra-linear connection mode） Frequency Response:20Hz—25KHz Output Load impedance:4Ω、8Ω Total Harmonic Distortion:≤ 1%(1kHz) Input Impedance:100KΩ Input Sensitivity:500mV-2000mV Signal-To-Noise Ratio（SNR）:90dB Output transformer : 80x40 Power transformer:105x60 240W FOR SALE: Spectacular KT88 Triode/Pentode power amplifier North Audio Stage Master: Tube Amplifiers: $6900. The amplifier achieves good power output and low distortion by employing “E-linear” feedback in the output stage. 00: BC Nov 27, 2023: 2 : FOR SALE: LTA (Linear Tube Audio) UltraLinear Power Amplifier: Tube Amplifiers: $4900. It feels like a solid piece of gear. KT88 SINGLE-ENDED STEREO AMPLIFIER Stereo 6-8 Watt/channel Single-Ended Zero-Distortion *Prototype sold – taking pre-orders for production units. it would be possible to achieve 500w RMS plus, but reliability has to be a consideration and Design and construction of a pair of push-pull class-A, Ultra-Linear Mono Block Tube Amplifiers that can be used with several different power vacuum tubes including EL34, KT77, 6L6GC, 6550, KT88, KT90. So he decided to write one, which he did: an 800 pages+ tome on everything tube (reviewed in Linear Audio Vol 2). com FREE DELIVERY possible on eligible purchases Amazon. Model EVO 200-1 for EL34 / KT88: Power Ultra-Linear: 44 / 45 Watts per channel: Frequency Response: EVO integrated amplifiers come with a high/low bias switch Dec 1, 2008 · Me personally I feel single ended ultra linear with a bit of the added local feedback is a fantastic circuit and may be my favorite amplifier design an performance. Can be used as an Integrated amplifier, power amplifier or Headphone amplifier. Last edited: Jun 28, 2016 RUmad Jun 18, 2014 · Buy Bangk Kt88-98 Vacuum Tube, 42w, Able to Replace Cv5220/6550, for Amplifier/ultra-linear Connection: Tubes - Amazon. You can select the one you prefer. The ultra-linear amps come with KT88 power tubes and Dynaco transformers. There are many pentode good for audio amplifiers but the most common in the current production are the EL34, 6550 and the KT88 so follows a compare table with the main characteristics and price. LM-88IA Amplifier can operate in two different ways Auto-biased or Fixed bias. Heath W3-AM Dual-Chassis 20W Ultra-linear Williamson Amplifier (Click on link to open page) 19. Aug 4, 2023 · The KT88-equipped ultra-linear tube amp heads are the big ticket items here, with the 100S offering guitarists 65 mega-loud watts and a taste of what Hendrix and Townshend were playing through, with 200s a reproduction of the brand’s powerful, straightforward and uncompromising bass amp of the late ‘60s. Ultra-linear electronic circuits are those used to couple a tetrode or pentode vacuum-tube (also called "electron-valve") to a load (e. Jan 22, 2024 · Himing RIVALS Wood Version KT88 tube amplifier bleutooth 5. In triode mode, the sound is soft, pure, and smooth, suitable for enjoying vocals and string music. The conventional ultra-linear configuration is arranged such that the screen grids have maximum DC voltage applied to them (in practice slightly higher than their corresponding plate/anode voltage because of voltage drop in the primary winding) - thus maximising power Feb 27, 2010 · But basically I plan to do a stereo tube amp in a single chassis based on the Class A Ultra Linear (UL) 12SL7 SRPP / KT88 SIPP Tube Amp in diyaudio projects. Phil Switchable from 60 watts Ultra linear to 30 watts pure triode mode. My advice is to make sure no music is playing and that the volume be turned down a little before making the change. 25W+25W (RMS triode working state) (KT88, 6550EH or EL34) 45W+45W (RMS ultra-linear working state) (KT88, 6550EH) 40W+40W (RMS ultra-linear working state) (EL34) Preamp stage power supply filtering Tube: 6SN7*1 Voltage amplifier stage Tube: 6SL7*2 Driver stage Tube: 6SN7*2 Power Supply voltage - 240v The KT88 mav be used in pairs in either triode, pentode or ultra-linear push-pull circuits and this Supplement gives circuits and operating data for amplifiers giving outputs of 30 to 400 v,ratts in various conditions of operation. the Amp does tend to heat up 3 types of amplifier mode; Ultra Linear, Comes with 6L6GC power tubes, but also supports wide range of power tubes, such as KT88, KT90, KT66, EL34, etc. May 13, 2017 · With the help from a program that calculates OPT's to a hifi level, I made 2x Ultra linear OPT for EL34 Push-pull config. 5w for 32ohm headphone Jul 27, 2022 · Hi, I built 2 prototypes of push-pull KT88 amplifiers, with 3. The final amplifier has a maximum output power of about 2x 20W. The amplifier has a stabile power supply with high capacitance energy storage and choke filter, for convenient and precise adjustment of the tube bias. The CS-100A incorporates a 6SN7 tube for voltage amplification, In many ways the amplifier described here is a classic design, using KT88s in a class AB pentode arrangement. EL84 6BQ5 C Large (octal base) power tubes for 30 to 100 Watt amps. User-selected amplifier modes, UT (Ultra linear) mode provides greater output power and TR (Triode) mode does smooth and rich sound. The figures given are for single ended use, but the valve is almost invariably used in push pull pairs. • Triode and ultra-linear selection are available. For DIY-ers, this amp also offers you plenty of room to hot rod and experiment what you can ultimately push the performance to a different level by using different upgrade capacitors. Pure hand-made, the whole machine is welded with scaffolding. The Line Magnetic integrated amplifier LM-216IA is a push-pull amplifier with 4x KT88 tubes in Class AB amplification and delivers 2x22W in triode mode and 2x38W in ultra-linear mode. f. Jul 22, 2006 · What do you think about this quiescent point for KT88 in push-pull ultra-linear operation? Values for TWO tubes - Class A DC Plate Voltage = 395 V DC Screen Voltage = 395 V Cathode Bias Resistor = 200 ohms Peak AF Grid-to-Grid Voltage = 70 V Zero-Signal DC Plate Current = 170 mA Zero-Signal DC The OddWatt 6SL7 SRPP / KT77 SIPP Class-A Ultra Linear DIY Tube Amplifier Project. The rear-illuminated front panel meter is used to adjust the polarization of the tubes. Attached. to a loudspeaker). Discover the exceptional sound quality of Cayin Tube Amplifiers today. Would bypassing R7 likely quiet the amp considerably by increasing the ripple rejection? Any idea how much gain the KT88 has when in Ultra-linear configuration? But under the cover, you will see an extremely well designed and well implemented classic ultra linear push-pull tube amp. Amp list. May 31, 2022 · The amplifier comes furnished with eight EL34 valves, and six 12AU7’s as driver/preamp valves, it will put out 70 Wpc in Ultra-Linear mode and 38 Wpc in the purer sounding Triode mode, achievable by handset control. Oct 15, 2018 · Hi all, I was hoping to get some feedback on the layout for a KT88 single-ended amp that I'm building. The LM-88iA is a push-pull, Class AB Integrated Stereo Amplifier using KT88 output power tubes, 6CL8A and 12BH7 input tubes. This listing is for a Classic Pair of Acrosound ULII UL-II Ultra-Linear Mono EL34/KT88 Tube Amplifiers The UL-II's are very nice sounding amplifiers from one of the most regarded Hi-Fi transformer manufacturer's of the 1950's and 1960's ACROSOUND. New Price $649 ULTRA-LINEAR II. A Small (noval base) pre-amp twin triode 12AX7 and 12AU7. On the left is a power switch, on the right a bias switch for EL34 or KT88, 120 or 150 tubes. For those who would prefer to source their own parts and build a DIY version of the OddWatt amplifiers, full details are available on the DIY 12SL7 SRPP / KT88 Push-Pull Monoblock Tube Amp and the DIY 6SL7 SRPP / KT77 Push-Pull Tube Amplifier project pages. Theme Settings. with KT88 and 5751 tubes. Power transformer is multiple tap so B+ can be anywhere from 400 to 500V. • The power amp stage uses UPGRADED KT88 – T2 collections * 4 nos tubes for class AB Push-pull power amplification. 2 x PSVANE HIFI SERIE KT88. There is a switch on the right hand side of the amp which enables the user to change over KT88’s, or indeed KT120’s. I've built the S-5 K-12G in the past, and been wanting to build a simple single-ended amp for a while, and then I saw blueglow electronics was doing this exact build. Raysonic Inc. I guess that the whole power amp and the power supply have to be correctly and especially designed for the connection in question. Jul 24, 2016 · SE KT88 Tube Amplifier Schematic (12AX7 SRPP input) by Jean Hiraga - [6 Watts, SIPP = Self-Inverting Push-Pull, UL = Ultra-Linear DIY Audio Schematics Page 1 Model: SP-120MKII KT88 Ultra-linear Integrated Stereo Tube Amplifier Owner’s Manual Raysonic Inc. my thought was to do it with KT120 or KT88 and ouput transformator Hammond 1650W Best regards Allan KT88 single ended Amplifier. This doesn’t happen in Triode. Triode and ultra-linear selection are available, which can be switched by the button on the amplifier. This tube amplifier is scaleable and can be used with 6V6, 6CA7, EL34, KT66, KT77 and KT88 output tube. Mar 20, 2022 · Here is my question: The amp is a Cary SLi80 signature, GL Kt88's output is 40 wpc triode-80 watts UL speakers are 4 ohm est 86 db efficient. 2 days ago · NEW Matt presents bias and operation data for the 6V6 tube in SE operation - 6V6 Single-Ended (SE) Ultra Linear (UL) Bias Optimization. I also understand that the EL34 is a tube made for correct ultra-linear operation. com The KT88 mav be used in pairs in either triode, pentode or ultra-linear push-pull circuits and this Supplement gives circuits and operating data for amplifiers giving outputs of 30 to 400 v,ratts in various conditions of operation. See full list on diyaudioprojects. 2. com: Bangk Kt88-98 Vacuum Tube, 42w, Able to Replace Cv5220/6550, for Amplifier/ultra-linear Connection : Musical Instruments Aug 1, 2023 · Ultra Linear. Has two modes, triode and ultra-linear mode 25 (triode) and (ultra-linear) 45 watts respectively. Some of the prices have been officially announced and below is a list of all the new models. DIY Single-Ended KT88 / 6L6 / EL34 / 6CA7 What type of valve is a KT88? The KT88 is a Beam power valve with an anode/plate dissipation [originally] of around 35 watts, it is sometimes referred to as a pentode by some people, but in fact the clue is in the title “KT” which stands for “kink-less tetrode” The main feature differences in the Kink-less Tetrode compared to the Pentode [and early Tetrode’s] was the use of two Jan 4, 2017 · Right out of the box (I bought a wired amplifier – not a kit), the amplifier sounds very, very good; excellent dynamics and tight bass with no glare at all. User-selected pure post-stage and integrated modes; Nov 8, 2019 · When switch the HA-6A to KT88 mode, you can use KT88 variants including KT100, KT90, 6550, 6550A, 6550EH vacuum tubes. 300W is my next goal. Oct 30, 2020 · Swapping out the EL34 set for the KT88 generally mirrors the changes heard when switching from triode mode to ultra-linear. KT88 SE Stereo Amplifier – Hand Wired Dimensions: 18. Atarashi chose the half Mint Acrosound ULTRA-LINEAR II 60 Watt Tube Amp USA 1950's. Feb 4, 2018 · Technical Parameters: Speakers output power: 25W + 25W (RMS triode mode) 45W + 45W (RMS ultra-linear mode) Headphone output power: 300ohm with 900mW ， use 270 like a basic divide to calculate the output power , for example 270 / 300ohm =0. BOX 46565, Toronto, P. I use 12BH7's or the Russian 6N6 instead of the 6SN7's much better drive. 11wpc I'll give a bit more info that may help some that are interested to build what I've suggested. amplifiers using EL34 6L6 6V6 tubes can be tested with the same method The OddWatt 6SL7 SRPP / KT77 SIPP Class-A Ultra Linear DIY Tube Amplifier Project. Nov 26, 2014 · All connections are made at the back, with speaker taps of 4, 8 and 16 Ohm in stereo operation or 2, 4 and 8 in mono mode. You can use El34 or Kt88 power tubes or variants with a flick of the switch on the back. I'm using the Stock KT-88 tubes in both Triode and Ultra-linear mode. P. The ultra-linear circuit is recommended for outputs up to 100M" when the maximum output coupled with the Feb 15, 2022 · For the next amp I was contemplating running KT88's with a 5k transformer, about 400V across the tube and 100mA. The NX-2 is a Japanese inspired KT88 Ultra-Linear 8 Watt Single Ended, Class A Stereo Power Amplifier Tube lineup Our standard Tube Line up Consists of a 12AU7 and a 12BH7A both dual triode's operating both sections in Parrallel. The amplifier stage is based on the Compact Hi-Fi Power Amplifier. From the Super KT’s owner’s manual, “This amplifier represents a departure from the typical push-pull amplifier in that it can be used to produce 20 watts of Triode sound using EL34’s and with the flip of 3 switches can produce 80 watts in Ultra-Linear mode using KT-150’s (and everything in between). I have the HT voltage set to a regulated 500V so I am biasing at 50ma quiescent current. Jul 25, 2018 · This simple single-ended amp project by Pete Millett is a great performer and a very well documented project that was immediately adopted by many DIY'er's. As you could notice by comparing these two amplifiers, there were very minor changes between them except the differences in power supply circuit. This Class-A Push-Pull Tube Power Amplifier uses a Pair of Push-Pull Class A, Ultra Linear Mono Block Tube Amplifiers that can be used with several different vacuum tubes including KT77 / 6L6GC / KT88 with a 12SL7 driver and 6NO30 tubes. It can operate in either triode or ultra-linear modes, allowing the user to select which one they prefer. BOX 46565, Toronto, Ontario M1T 3V8 Canada Ontario M1T 3 V8 Canada sales@raysonicaudio. Jun 22, 2007 · With various KT88 amplifiers we have had good results using the new production JJ KT88 Blue Glass and Genalex - Gold Lion KT88 tubes. M50 KT88 Stereo Power Amplifier : Built Around KT88 Tubes: We built the M50 power amplifier around four KT88 tubes under an ultra-linear circuit that could provide 50 watts of subtly textured music. With an on-board bias meter, the integrated amplifier can run either KT-88 or EL family tubes and uses silver internal wiring. But I want more power! . Class A push-pull power amplifier to reduce distortion; User-selected pure post-stage and integrated modes; A single-ended parallel, ultra linear dual mono integrated valve amplifier featuring KT88 valves used in sophisticated output stage design and improvements over the original model. c o m w w w. is rated at 80 watts per channel in Class AB Ultra-linear mode. Using only a pair of KT88 I have got 25W in triode connection and 35-40W using the ultra linear configuration. Output Transformer for Sunn, Project - 2200 Ohm 120w / 240w UL 4 8 16 taps MADE IN USA Great for HiFi (120w at 20Hz-20KHz), Gu Oct 29, 2013 · Hey Read these threads 6SL7 SRPP / KT77 Push-Pull Class-A Ultra-Linear DIY Tube Amplifier OddBlocks - Class-A Push-Pull KT88 Tube Amplifier (12SL7 Driver) DIY Audio Projects Forum • Oddwatt Push Pull Tube Amplifier Projects This is an interesting implementation of a range of tubes Good luck Nick ••• Feb 22, 2022 · A clicking sound might be expected when switching from Triode to Ultra-Linear mode while the amplifier is running. Great working condition. Nov 30, 2009 · Class-A Ultra-Linear 12SL7 SRPP / KT88 SIPP Tube Amplifier. This amplifier differs from many classic designs in some ways as well. There is a Red selection button on the Back of the amp to switch. 00: QC Nov 26, 2023: 3 : FOR SALE: Onkyo M-5000 Power Amplifier- 105 watts RMS/channel: Solid State Amplifiers: $265. Adjusting the bias also sets the quiescent dissipation (temperature) of the valve. Atarashi modified the amplifier to fit for KT-88 AB1 Push-Pull Ultra-Linear operation. 4 x kt88 with fully regulated 470V B+. calls for a power transformer capable of 325mA supplying the two KT88s, a 6J5 and a 6SN7. This power could be considered low for a pair of KT88 but I want low feedback, low distortion and good damping factor. Dec 28, 2010 · Off the top of my head, there is the Audiospace AS-6m (KT88, ultralinear/triode switchable), Primal Luna Prologue 5 integrated amp (KT88 ultralinear), Cayin A-88 integrated amp (KT88 ultralinear/triode switchable), at least one Ayon integrated amp(KT88?), Rogue Atlas (EL-34 ultralinear), Quicksilver Audio Mini-Mite and Mid Mono (EL 34, KT88 Aug 30, 2023 · Technical Specifications: Tubes: KT88-98 × 4 (Output Tubes) 6N8P × 4 (Drivers and Cathode followers) 12AX7B × 2 (Voltage amplifiers) Maximum Output: 20W per channel (8Ω and Triode Mode) 50W per channel (8Ω and Ultra linear Mode) Output Jacks: Two channels with two groups gold plated jacks Output Impedance: 4Ω and 8Ω Input Jacks: Gold Jan 10, 2017 · If you use a KT88 in a circuit with the same parts and connections, but only change the screen connection to go from Triode, to Ultra Linear, to Pentode (Beam Power) modes, and do not use negative feedback you will get the following: Using a KT88 in Triode mode gives a plate resistance of perhaps 800 to 1200 Ohms, depending on the voltages and Nov 30, 2009 · The Oddblock amplifier kits can be purchased directly from OddWatt Audio. Ultra-linear amplifiers typically used cathode bias, which provides excellent reliability and extends tube life so, in addition to their sonic qualities, ultra-linear amplifiers also developed a reputation for long tube life and reliability. 'Ultra-linear' is a special case of 'distributed loading'; a circuit technique patented by Alan Blumlein in 1937 (Patent No. On good recordings you will hear height and depth. Mar 25, 2007 · Maybe you shouldn’t compare ultra linear and conventional pentode connected screen grids in “comparable circuits or in circuits that otherwise are the same” as I wrote. 12AT7 12AY7 similar but less used. The OddWatt 6SL7 SRPP / KT77 SIPP Class-A Ultra Linear DIY Tube Amplifier Project. 00: ON Feb 14, 2018 · It is one of the few SET designs that uses KT88/KT120/KT150 power tubes and can be run in either SET or Ultra-Linear mode. Feb 1, 2015 · Then, Mr. Mar 16, 2017 · Now i'd like to advance myself in tube amplifier for speakers as Beta22 is more suitable for headphones. The CS-55A is the most recent advancement in tube amplifier technology created by Cayin. A Pair of Push-Pull Class A, Ultra Linear Mono Block Tube Amplifiers that can be used with several different vacuum tubes including KT77 / 6L6GC / KT88 with a 12SL7 driver and 6NO30 tubes. Dec 28, 2018 · It's a dis-service to David Hafler -- who is largely responsible for developing the Ultra-Linear concept here in America, to those who are trying to learn the difference between true Ultra-Linear operation and tapped screen grid operation, and to all those who wonder why their grandfather's HF-20 or W-3M won't generate but a fraction of the Jul 24, 2013 · GEC 4 x kt88 Gingertube I have made several amplifiers using the GEC multiple pair KT88 circuit using 4 Tubes. •Can be used as an Integrated amplifier, power amplifier or Headphone amplifier •Triode and ultra-linear selection are available, which can be switched by the button on the amplifier •Includes a remote control, vacuum tube protective cover, fuse and an English manual. Jul 19, 2011 · This is for KT88 based Single Ended Ultra Linear amp using very good output transformers. I am having a hard time biasing the tubes since the the cathode current keeps drifting up or down. (this is the circuit I use, it has performed extremely well, even on cheap outputs). It does have 4 ohm/8 ohm switches, playing them pretty loud on triode, the volume pot on the amp is about 3 o'clock. To create a push pull amplifier is possible to use triode and pentode but obviously to test many configurations like the ultra linear we need a pentode. The KT88 is also suitable for use as a series valve in a stabilized power supply. A circuit for a 70 watt amp. Running the plates at 600vdc @ 140ma each and a pair of hammond 1650R output transformers. Triode does not have this problem. The American Tube Amp robust 60 watt ultra-linear push-pull tube-type monobloc amplifier was inspired by the venerable EICO HF-60. The triode works in a soft, pure-and sleek sound, suitable for listening to vocals, strings and other types of music. 9K 33% ultra linear / 12% cathode feedback transformer (3. The KT88 can be operated in triode mode or ultra-linear mode. Sounds awesome. While in Ultra-Linear mode, the X7 makes a clicking sound when it is turned off. Willsenton R8 is an integrated Amplifier, it is a Power Amplifier too (there is a group Power amp input), it is a Headphones amp too. The new dual-mode Cayin Audio CS-100A tube amplifier is rated at 80 watts per channel in Class AB Ultra-linear mode and 50-watts per channel in triode mode. His design was based around Mikael Abdellah's KT88 SE Tube Amplifier design from 2003. I’ve heard this amplifier with both the 6550 and the KT120 tubes. Premium Grade Construction at a Fair Price:a majority of the components are of audiophile grade, produced by some of the best companies in the industry . I also added a milliamp meter so that I can measure the current going through the KT88s. More Single-Ended KT88 and 6550 Tube Amplifiers. May 9, 2007 · "The GEC Audio Tube Data book reprint has a circuit for a 100 watt fixed-bias KT88 ultra-linear amplifier. The amp uses a 12AX7 valve configured as a SRPP and the output valve is running in pentode mode. 5K ohm (red - anode, black - HT) with an ultra-linear tap (yellow) that connects to the screen grid (optional). com w w w. r a y s o n i c a u d i o . The saying, “the […] With a total anode-plus-screen dissipation of 28 Watts, when operated with cathode bias, its power output, in push-pull pairs, ranges from the 12 Watts of the original Williamson amplifier, to 32 Watts when used in an ultra-linear output stage. Without feedback the amplifier works fine but with feedback applied the output valves make a loud whistling and arcing noise. It is important to note that the KT88 tubes are tetrodes and are this fitted with 4 electrodes which are essential to delivering power. 5% distortion. Forty-two watts per channel, Class AB Integrated Stereo Amplifier with KT88 (JJ Electronic) output power tubes, 6CL8A (Mullard) and 12BH7 (Electro Harmonix) input tubes. A member on another thread was very critical of this circuit due to the Cathode resistors on the 6SN7’s being 47k he claims it should only be 15k and the 47K grid resistors for the KT88’s. The input stage is a SRPP design and can be used with 6/12SN7 or higher gain 6/12SL7 preamp tubes. Second, the X7 clicks when turning it off while in Ultra-Linear. A picture of his finished KT88 tube amp is shown below. beam pentode 2=300V 255 295 355 375 415 455 A High-Quality Tube Amplifier: Despite its affordable price, the Yaqin MC-84L amplifier is a remarkable audiophile-grade ultra-linear push-pull, full Class A tube amplifier. Yaqin MS-110B KT88 push-pull tube amplifier HIFI EXQUIS lamp amps swith triod and ultra-linear remote - Yaqin - YaQin MS-110B KT88 push-pull tube amplifier - Label: New - Category: KT88 KT120 KTxx Push-Pull Amp - Price: $ 830. 00 This of course is with the amp set in "Ultra Linear" mode, but with the amp switched to "Triode" mode it's a different beast, the bass is better plus the overall sound image is more coloured/deeper. Both are fantastic with the main difference being that it drives woofers with more authority in Ultra-linear mode. Output power: 13W * 2 (ultra-linear The body of the unit is also metal. 496,883), although the name 'distributed loading' is probably due to Mullard. Feb 24, 2015 · My current build is a 125W amp. 100S – 65W Ultra-linear guitar head with KT-88 tube power stage and Dynaco transformers – $3199 Using a modified version of ultra-linear push-pull amplifier circuit, has more than enough 50 watt power each side, output tube KT88 x 4, adopts hand welding to ensure the true reality of the sound quality, High voltage durability; Solid and powerful low frequency, Fine and smooth, vigorous and emotional sound experience. This article was published in audioXpress, April 2005. 0 out of 5 stars 1 The KT88 has an absolute maximum anode dissipation rating of 42W and is designed for use in the output stage of an a. The Cayin CS-55A KT88 can easily go from triode mode to ultra-linear mode; the difference between these two modes is the number of electrodes used by the tube. 5 to 3k and 250V-300V across the tube. 3@5a and a 70v bias tapping)several Rubycon 450uf @400vdc in Aug 12, 2013 · GEc KT88 the circuit I submitted is missing the voltage amp; you need to use a 6SN7 instead of the 6J5 shown; the voltage amp direct coupled to the Phase splitter. Used – Mint. Four oversized power… Apr 20, 2022 · This amplifier is good for the Rock & Roll sound with high bass if you plan on getting the KT88 tubes. Mar 16, 2011 · I built a prototype power amplifier in the lab using KT88 tubes in push pull ultra-linear. 9w for 300ohm headphone , 270 / 32ohm = 8. 1. We are utilizing 10 KT88 beam-tetrode power valves in each output stage, coupled to an ultra linear output transformer, this will ensure a long service life as each output valve will be working @ 80w per device against a maximum for the KT88 of 100w. beam pentode Base: OCTAL Uf = 6,3 V uLTrA - LineAr COnneCTiOn - 40% TAps pLATe ChArACTerisTiCs a. Tones retain their color and body. YAQIN MC-100B 60WPC KT88 Class A Tube Integrated Amplifier *Please ask us about the availability of this product. g. The R8 has a switch to change from ultra-linear mode to triode mode. Features User-selected amplifier modes, UT (Ultra linear) mode provides greater output power and TR (Triode) mode does smooth and rich sound. In its ultra-linear mode, you’ll notice its sound capabilities in full form. Of course our monobloc is a substantial upgrade to the EICO HF-60 boasting higher quality components and substantial improvements to the amp circuitry. The amplifier is pictured in Figure 1. Additionally, it features an external TUBE SEL for KT88/EL34 vacuum tube swapping, offering triode and ultra-linear function selection. Nov 6, 2019 · There is a Red selection button on the Back of the amp to switch. Jul 12, 2007 · I just completed modifying an ELLA kt88 amp to run 100watts rms per channel. I'm officially an Audio Snob. Now, before assembling final variant, would like to get rid of Feb 27, 2011 · Hi All well i am looking for schematic to build a Ultra Linear Push Pull Tube amp with 250 - 300 Watt or more. The primary winding impedance is 3. kwsh oqocv wvt ejla ytorz eqptj zxt xfjtx hqaukqhcu wlrbxc