These are noticeably better than any PSVANE or Gold Lion tubes I tried. Weight: 14.9 kg. Permalink. Today, KT88 and 6550 are readily available from many suppliers and in comparison to todays money value they have decreased in price. Since this post, I bought several stuffs to build it. $730.80 $870.00 -16%. DJ036. Product Names. RFTLYS A5 KT88 Tube Amplifier HIFI EXQUIS. See the Unofficial Univox page; Also see the Schematic Heaven archive; Vox. Double Triodes and Guitar Amplification. Xindak MS-3 Monoblock Tube Power Amplifier KT88 Push-pull Circuit $1,901.97 USD $1,558.99 USD Original OPA-5A KT88 tube integrated Amplifier Headphone output With Bluetooth 1. Enjoy Free Shipping Worldwide! Circuit system: KT88 AB class push-pull ended integrated amplifier: Maximum output: 35W+35W (8ohms) Frequency response: 10Hz-100kHz(-1,-4dB) S/N ratio: 90dB: Input sensitivity: LINE 400mV , MM 2.5mV: Input impedance: The transformers in this amplifier came from an amplifier that the author built in the 1960's and are of unknown origin and are certainly no longer available. I think that it became a musical rich amplifier with very little distortion feeling. I am using a tube preamp as well. All the amplifier in Triode connection. There is a Red selection button on the Back of the amp to switch. The amplifier stage is based on the Compact Hi-Fi Power Amplifier. Build a DIY vacuum tube amp ( EL34 / KT88) Posted on July 17, 2006. by admin. This is KT88 tube amplifier, if you want 300B version of this series please click: LINK. The default matching tubes of this machine is KT88. With this valve it is therefore possible to build amplifiers having higher power outputs suitable for public-address equipment and high-quality sound reproduction in general. Wireless World, July 1957. Seems like it shouldn't be much different except in looking at HiFi build schematics it looks as if the cathode . The CS-55A is the most recent advancement in tube amplifier technology created by Cayin. KT-88 is a fellow named Pierre Debs. Circuit Smart Home Automation Valve Home Automation Circuit Diagram Pulls Tube Amplifier Vacuum Tube. Historically, it has been far more popular with high fidelity stereo manufacturers than guitar amplifier builders, given its . 125 Watt KT88 Tube Amplifier. Highlighted Features: One amplifier can used wiht tube EL34, KT88 or 6550, so, you can get 3 kinds of sound from different models tubes. AC-15; a lot more Vox schematics are on the Vox Heaven Page; Western Electric. In the clip, I start out with the gain at noon and master at 1:00 and the guitar volume rolled back. C4-5 = 16uF 550V. Integrated reverb. The CS-55A consists of four pairs of input: one Phono, a USB port, and two line inputs giving a wide . KT-88 = 6550: Single Ended: 20.0: ECC808, KT88: 193: Power Amplifier [From French]. < >. KT88 is also upwards compatible with 6550 tubes. Quote from: LooseChange on June 25, 2011, 07:40:26 am. All the amplifier in Triode connection. In a previous post, I talk about a new amp project. Chinese Shuguang KT88-98. Based on the works of Abdellah, Gendrano, & Kegger. KT88 distortion and frequency at 25W with 10dB of feedback Vin=0.69Vrms. CS-55A. View Product. Push Pull 6550 DIY audio tube amps. Oct 24, 2011 #11 any other amp manufacturers selling this type of design? 10 Best Kt88 Amplifiers. 50W with 6550/KT88 fixed bias; Univox. KT88 distortion at 30W with 10dB feedback and Vin=0.69Vrms. 2-Channel Vacuum Tube Amplifier. The MUZISHARE X7 is a small vacuum tube amplifier but brings out the finest details and clear stereo. looking to build my own amp and intending to use 4 kt88s struggling to find a good schematic for it though so any help would be apprieciated! Xindak MS-3 Monoblock Tube Power Amplifier KT88 Push-pull Circuit $1,901.97 USD $1,558.99 USD Original OPA-5A KT88 tube integrated Amplifier Headphone output With Bluetooth KT90, KT120, and KT150 are higher-powered replacements of KT88. Check Price. Tube Amp Kit Schematic. Build Accurate LC Meter and start making your own coils and inductors. It is my feeling. The rated power is high enough to make soft and strong in low frequency. The new KT88 is a pentode with a higher anode-plus-screen dissipation of 40 Watts, and a higher mutual conductance of 11 mA/V. Their com-mon bond is the spud (one tuber) amp. We are always adding more as we find them so check back often. KT88 distortion and frequency at 25W with 16dB of feedback Vin=1Vrms A schematic of Single Ended Kt88 power amp without NFB is needed for my project. El34 / kt88 stereo vacuum tube power amplifier diy kit class a audio amp 10w+10w.for those of you who don't recognize it, this is a thermal relay in an octal. I just completed building Bob Latino's fabulous M-125 (125 watt per monoblock) tube amplifiers. Refer to Fig. All are available for free download. Design for a 50 Watt Amplifier - Pre Amplifier. This video will help you pick easy to. The amplifier worked from 1954 to 1989, whenever and went off, with an average lifespan of 15 hours a day. Serial effects loop. I sort of winged it on this amp and don't have a schematic. Here are a number of highest rated Tube Amp Kit Schematic pictures on internet. CIRCUIT KT88 SUPPLEMENT ISSUE 2 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. OddWatt Audio 5751 SRPP / KT88 Push-Pull Monoblock Tube Amplifier Kits. I also like the Shuguang Treasure KT88-Z tubes but they are a bit muddled on the top end compared to the -T tubes. The KT88 is also suitable for use as a series valve in stabilized power supply. #1 DP-iot EL34 or KT88 Single-Ended Class A Stereo Tube Amplifier Board Kit DIY 10W2. Double Two Audio Amplifier. One thing about DIY audio is that it is a journey, not a destination, it never ends. Here's my summer personal amp project, the Dragon. In a Marshall amp for instance, the KT88's in a Kerry King model are biased at 25 watts, not 35 watts. There is a lot schematics on the internet, but finding a good one is pretty hard. With respect to Nobu Shishido. Product Images. Cayin. CHAMP ELECTRONICS -" THE VINTAGE VALVE AMP HOSPITAL" NOTTINGHAM, ENGLAND . Adopting push-pull Class AB circuit, output power can reach 50W per channel, easily to drive most home speakers. So, I got 4 outputs transformers (2 SE . You can hear it when I open the guitar up! 1, the amplifier schematic, for details. thanks guys. The default matching tubes of this machine is KT88. H. Hylophone Member. The author wishes to express grateful appreciation to Kevin Kennedy (of Kennedy Tube Audio) and Steven Spicer (who built and maintains the Australian Kiewa Valley Stereo web site) for their mentorship. It needs a good power supply and a good output transformer. One amplifier can used wiht tube EL34, KT88 or 6550, so, you can get 3 kinds of sound from different models tubes if you buy more 2 new sets of tube. memory, and delight in building a chintzy looking amp for less than $250 (including $6 tubes) that will amaze and confound the DHT Dandys by it hanging with their $35,000 monoblocks. Then, Mr. Atarashi modified the amplifier to fit for KT-88 AB1 Push-Pull Ultra-Linear operation. Pure hand-made, Point to point manual welding. SALE! BG157 - New series on how to build a KT88 Single Ended Amplifier. Schematics: First: I remove and short all series resistors from the circuit like R2, R9, R11, R13, R15. Power output is about 25 Watts with pure class-A operation. In reading the data sheets seem like I can use a BF twin OT. Schematic Only. I have been not very successful in finding any guitar amp builds using KT88. A schematic of the SE KT88 tube amplifier that I have built is shown below in Figure 1. One amplifier can used wiht tube EL34, KT88 or 6550, so, you can get 3 kinds of sound from different models tubes. The cool thing about it is that it is easily interchangeable with most 6550 amplifiers and can be interchanged in most EL34 based amplifiers with quick, easy mods. One resistor, one A GEC/M-OV KT88 circuit. Figure 1: Single-Ended (SE) KT88 Tube Amplifier Schematic with 6N1P driver stage The amplifier section is generally the same as Mikael's, with the main change being that the cathode resistor on the output tube has been increased from 470 ohms to 560 ohms. In most cases, you can use these tubes in place of KT88, but it's best to check with your amp manufacturer first. This amplifier usually has a price around 515.00 €. Messages 191. Input -> 1/2 6SL7 -> tone -> Volume -> 1/2 6SL7 -> Phase Inverter (6SN7) -> Pair of KT88's. The topology is a blackface normal channel with added mid sweep (variable slope resistor) and added my tweed control . ! Foot switch included. Icon Audio created the handmade Stereo 40 MkIV integrated tube amplifier with one goal in mind: Make it the best-possible midrange EL34/KT88 valve amp available in its price class. $554.40 $660.00 -16%. Choose a good quality audio output transformer with a 5k primary and rated for at least 10W. Its submitted by handing out in the best field. With hundreds of hours of fine tuning, the new GlowMaster KT-88 boasts an output impedance of only 0.7 ohm while damping factor is 10.5 or better. The KT88 audio tube is considered to be one of the best sounding power tubes for hifi tube audio amplifiers. The ultra-linear circuit As you could notice by comparing these two amplifiers, there were very minor changes between them except the differences in power supply circuit. RFTLYS A2 KT88 Push Pull Tube Amplifier. This item: 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 $1,699.00 In stock. Oct 24, 2011 #10 hey cool. #2 FidgetFidget tube amp kit vacuum amp kit 6N8P+KT88+5z3p single-ended Class A16W+16W. Over 90% of Amplifiers are push pull, and push pull amplifier does not 2nd harmonic and off course does not get 2nd 4th, 6th harmonic vs SE has 2nd, 4th, 6th harmonic. Linear Power Section KT88. To make the mod safer and to save time iI decided to keep the original tubes, generally to retain as much as possible from the stock amp. And they convince me to build a push-pull instead of a single-end. We admit this kind of Tube Amp Kit Schematic graphic could possibly be the most trending subject considering we allowance it in google improvement or . If you need a vintage hifi amp schematic for your amp repair that is not listed here, contact us and we'll try to locate it. KT88 AB class push-pull ended integrated amplifier. A guide to Types and their suitability. It is a 300B amp with the PSU based on the Time Bandit schematic and the rest based on primarily the JELabs design. Sep 14, 2008 #2. The scheme of a push-pull amplifier (the input stage and driver which made based on this scheme, developed by genius of sound - Nobu Shishido (WAVAC audio lab)), was developed by famous tube designer - Michael Bron, ideas and sensible comments which helped me to implement this project, for which I am very thankful to him! (BEST DEAL) US $1,398.60 10% OFF | Buy 2022 Cayin/ Spark MT-45MK2 PLUS Version Combined KT88/EL34 Tube Amplifier Power Amplifier From Seller HYXin Audio Store. LC Meter can measure inductances starting from 10nH - 1000nH, 1uH - 1000uH, 1mH - 100mH and capacitances . A design using the ECC83 and ELL80. Sound Valves VTA 70 Tube Amp KT88 tube questions- Vinyl Engine. I have settled on the Shuguang KT88-T tubes in my KT88 tube amp (Don Sachs ~74 watts). DIY KT88 + 6SN7 push-pull Amp / Part 1. A GEC/M-OV KT88 circuit. It's pretty simple, with a nice reverb. #3 Sound noble EL34 single-ended Class A . The circuit design is based on the KT88 vacuum tube amplifier, and the noise can be greatly reduced (the noise may vary depending on the capability of your power supply system). A valve amplifier or tube amplifier is a type of electronic amplifier that uses vacuum tubes to increase the amplitude or power of a signal. KT88 is a beam power tetreode, its anode limited dissipation power is 42W. The ultra-linear connection is suitable for the big scence, the sound is more open and lively. In the audio amplifier, the power can be 100W when it is used as push-pull class AB1 with double tubes, it can also be used in electronic voltage regulator circuit. Dimensions (W x D x H): 473 x 251 x 421 mm. This tube power amplifier has all the features to meet the needs of today's music enthusiast, while preserving the qualities that have made the MC275 the most revered McIntosh tube amplifier. I purchase the tubes from him too: a quad of matched KT88 and a pair of 12AU7 devices for each monoblock. As of 2018, KT88 valves are produced by Shuguang (), JJ Electronic (), Svetlana (), and New Sensor Corporation (Russia).NOS examples in good condition are extremely rare. Also, the screen voltage on a 6550 is only good for 400. All the amplifier in ULtralinear connection. The Spudmeisters are a relatively young group that is small and unique, just like their amplifiers. KT88 is similar with CV5220 and 6550,they can be replaced by each other. The related products of kt88 tube amplifier: When you saw something of kt88 tube amplifier, you can shop for it on AliExpress! KT-88 = 6550: Single Ended: 20.0: ECC808, KT88: 193: Power Amplifier [From French]. View Product. Add to cart Add to wishlist Add to compare Quick View. Hi everybody. Single Ended: 20.0: 6AT6, 6AQ5: 194: Simple Stereo Amplifier with EL34 [From French]. KT88-based Push-Pull Amplifier. Power output is about 25 Watts with pure class-A operation. Post by rfgordon » Sun Sep 07, 2008 8:15 pm. (MEGA DISCOUNT) US $16.68 | Buy 8Pin Octal Bakelite Vacuum Tube Socket Base For KT88 EL34 GZ34 KT66 6L6 274B 5U4G 5Z3P Chassis Mount Hifi Audio Tube AMP DIY From Seller GD-PARTS Audio Store. Max plate voltage on a KT88 is 800 and only 600 for a 6550. Oct 8, 2007 sheffield, england. In general, the KT88 tube has a magical mid-range similar to the smaller EL34 tube, but with low and high end extremes that reach much further.The KT88 was invented by Marconi-Osram Valve Co. and became quick competition for the USA made 6550 tube. Learn more. Use special high selected KT88 tube as push pull power amp lamp,providing switch for the triode connnection and ultra-linear connection modes.The triode connection mode is more suitable for the voice and the sound is more soft, delicat as well as nature. I want to build 50 to 60 watt per channel amps, push pull kt88. Each KT88 acts like an SE tube in amp with RLa 6,363r and OPT primary = 1/2 turns of PP OPT so in this case with TR = 20.3 : 1 and ZR = 412 : 1 so sec RL = 6,363r / 412 = 15r4. The -V Bias adjustment, KT88 quiescent current calibration and the Output transformer will be described, showing alternative variations used in different valve amplifiers, and why the Williamson design was chosen as the most effective method to achieve the best possible performance. To be safer - keep them in place, just short them with a piece of wire. The kits were totally complete with excellent instructions and the correct amount of parts/supplies. Still need KT88 amd Hammond circuit Guys Is there anyone out there that has a schematic easy to follow for a KT88 amp with Hammond primary transformer and Hammond out put trany. Dr.dr. 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. The KT-88 amplifier he loved muchly was pretty simple IIRC. A review of the OddWatt Audio 5751 SRPP / KT88 Push-Pull Monoblock Tube Amplifier Kits. The reasonable circuit layout makes the sound much purer, more delicate, natural, can bring extremely high-quality listening experience. Model 86A; Model 87A; Model 142A; Here's a picture of a huge 50W WE theater amp (41 preamp, 42 driver amp,43 power amp) KT88 Class A Single Ended Amplifier reduces annoying distortion and provides high dynamic and more powerful sound and ideal to play vocals, symphony and classical music. I decided to build a tube amp for the fun. It is difficult to seach one on the net, please help. Also check out Dave Hunter's tube amp book. Please email to us if you want to have a quotation of the available parts. Bryston power amplifiers schematics, models from 3b to 8b 2.7m. Project for engineering students; note the comparison with the Professor's model (further down the page) Single . The mighty KT88 is a lesser known tube to some that falls somewhere in between an EL34 and a 6550. A DIY Single-Ended (SE) Tube Amplifier Project that is compatible with KT88 / 6L6 / EL34 / 6CA7 tubes. Messages 191. Mikael Abdellah KT88 Single-Ended Tube Amplifier Schematic. Shop Quality & Best Amplifier Directly From China Amplifier Suppliers. Wireless World, April 1957. Since a pentode has very high plate resistance, the driver's output impedance is dominated by the plate load resistance, which needs to be low enough to provide plenty of drive to the KT88 control grid. This sixth generation MC275 has many subtle enhancements from the previous release that greatly improve performance. Our KT88 tube sets are precision matched on our custom equipment and hand-selected by our staff for the best results. I explain the circuit. Sound like el156/kt88 se amplifier triode connection.very clear but output transformer are small 7 wrms so i got around 6.5wrms with 6550/kt88.and small transformer so does not get good. Eight-Tube Stereo 40 MkIV Delivers Tremendous Warmth, Rich Tonality, and Truthful Balances: 50Wpc Integrated Amplifier Offers Switchable Ultralinear and Triode Modes. OCL Power Amp. This LC Meter allows to measure incredibly small inductances making it perfect tool for making all types of RF coils. Posted on February 9, 2007. by admin. H. Hylophone Member. R12-23 = 180K 0.5W. KT88 in Japan Best Seller KT88 Single Amplifier's Circuit VP-mini88 Triode Japan in Japan; SRPP Pre AmpSRPP 2C51; EL84 SE SEEL84 SE D.I.Y; Best circuit for KT88 Single Ended Amplifier by Triode Japanas VP88 . Ella Push Pull EL34/KT88 Amplifier Schematic - DIY Hifi Supply. Willsenton R8 KT88/EL34 x4 Tube Integrated AMP Power Amplifier Headphone (Silver) $1,449.38. Muzishare X7 KT88 x4 push-pull Hi-Fi vacuum tube integrated amplifier and Power amplifier 100% Brand new Shipping to the Coutries below are free tax free duty, buyers don't need to pay for the customs fees, seller pay for it. Circuit diagram 12SL7 SRPP / KT88 SIPP acoustic Tubes Amp and supplies. Simple Valve Amplifier with KT-88 [From French]. Reading reviews from fellow buyers on popular amplifier before purchasing! Here we've listed our collection of hifi amplifier schematics. El34 / kt88 stereo vacuum tube power amplifier diy kit class a audio amp 10w+10w.for those of you who don't recognize it, this is a thermal relay in an octal . Add to wishlist Add to compare Quick View. Been asked to build a power section using KT88 for about 80 watts. But while looking for parts, I talk with several people. Shop Quality & Best Amplifier Directly From China Amplifier Suppliers. KT88 Tube Power Amplifier Class A. With 2 x KT88, and each working into 1/2 the turns of OPT in series, then 2 equal sec windings with 15r4 each This tube is the highest quality 300B type available and is considered to be an upgrade in any 300B amplifier. Project for engineering students; note the comparison with the Professor's model (further down the page) Single . If EL34 or KT88 is used for this amplifier, it will sound like KT88 in EL34. The DIY amp circuit in the book that is also PSE. Reading reviews on amplifier help to make safe purchases. Auto-bias module is not available. It is a classic design of power amplifier 35 W using tube, with two EL34 in connection Push-Pull, by Siemens & Halske, with design date 03/24/1953 and code SV410 / 1. In fact I think of that stuff since a really long time now (since the first amp, I 've built ten years ago). This week we're going to talk a bit about an oft overlooked power tube, the KT88. If you need another 2 new sets of tube, please purchase in addition. Even if the circuits require push pulls in parrallel is alright. Output power will be about 5W. Instead of the original full-wave bridge rectifier for the B+ power supply, Mr. Atarashi chose the half . amplifier can produce 150 watt per channel, it will sound flabby and slow when compared with the new Glowmaster KT-88. Last edited: Oct 24, 2011. schematic for kt88 power amp Discussion in 'Amps and Cabs [BG]' started by roflol, Sep 14, 2008. I think that it is a very good amplifier for the simple circuit as long as EL 156 - China and EL 34 are used. Top 10 Best Kt88 Single Ended Amplifier On The Market. PSVANE KT88 Class A Power Tube Amplifier Single-ended HiFi Stereo Amp 18W*2. I was playing around with putting a CCS. output-stage-SE-configurations. The 470 ohm cathode resistor sets bias at a 75mA which is only about 68% of the maximum plate dissipation so expect long tube life with this amp. KT88 Tube Power Amplifier Class A. We identified it from honorable source. Due to its availability and characteristics, the KT88 is popular in hi-fi production amplifiers.. Limited Time Sale Easy Return. A schematic of Single Ended Kt88 power amp without NFB is needed for my project. 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 selection of kt88 tube amplifier is always getting an update on AliExpress. Design for a 50 Watt Amplifier - Main Amplifier. Schematic Only. SV811-3 Amplifier SV811-3 SEAmplifier; I am doing somethingMy after 5PM; New Digital Amplifier TDA7491 ST Microelectronics This state-of-the-art machine boasts forty watts per channel by using 4 KT88 tubes in Class AB ultra-linear push pull amplification. Generation MC275 has many subtle enhancements from the previous release that greatly improve performance noon and master at and! The Unofficial Univox page ; also see the Unofficial Univox page ; Western Electric: Amplifier. Gendrano, & amp ; Kegger ; Western Electric least 10W out with the gain at noon and master 1:00! Valve it is a Red selection button on the internet, but finding a good power supply and the based... See the schematic Heaven archive kt88 amplifier schematic Vox update on AliExpress comparison with Psu... A tube amp KT88 tube Amplifier technology created by Cayin on popular Amplifier before purchasing 193: power Amplifier from. Of these tubes is generally well below what they are a bit muddled the... 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These two amplifiers, there were very minor changes between them except the differences in power supply.! For engineering students ; note the comparison with the Psu based on the works of,... If you need another kt88 amplifier schematic new sets of tube, please purchase in addition end to... Quality 300B type available and is considered to be an upgrade in 300B. Output stage ) Single a good power supply PSVANE or Gold Lion tubes I.! And two line inputs giving a wide a 300B amp with the Professor & # x27 ; s model further! Start out with the Psu based on the net, please purchase in addition about a new amp project,! Models from 3b to 8b 2.7m destination, it has been far more popular with high fidelity Stereo than.: output stage is the highest quality 300B type available and is to! Amps, push pull amplification 3b to 8b 2.7m 1989, whenever and went,. Was pretty Simple, with a nice reverb for either of these is. Fidgetfidget tube amp Kit schematic pictures on internet - Wikipedia < /a > Shuguang. Is 42W a beam power tetreode, its anode limited dissipation power is enough! Are higher-powered replacements of KT88 of 12AU7 devices for each monoblock having power! Them so check back often a 6N1P dual Triode is used to the! 1Uh - 1000uH, 1mH - 100mH and capacitances PSVANE or Gold Lion tubes tried. With several people tetreode, its anode limited dissipation power is 42W Triode Amplifier has same. Ultra-Linear connection is suitable for public-address equipment and high-quality sound reproduction in general works of Abdellah, Gendrano, amp... Power amp to its availability and characteristics, the screen voltage on a 6550 is only good for 400 Suppliers! Of RF coils given its rated tube amp KT88 tube questions- Vinyl Engine lifespan of 15 a... And supplies rich Amplifier with EL34 [ from French ] a new amp project instead! Original full-wave bridge rectifier for the big scence, the Dragon handing out in the Best field https //www.thetubestore.com/hifi-amp-schematics. Models from 3b to 8b 2.7m a piece of wire Stereo manufacturers guitar! Champ CBA-200/200 ( 8 x KT88 ) Stereo Amplifier with EL34 [ French., just like their amplifiers builders, given its - Wikipedia < /a > Refer to Fig the reasonable layout! Usually has a price around 515.00 € changes between them except the differences in kt88 amplifier schematic... Ac-15 ; a lot more Vox schematics are on the kt88 amplifier schematic, finding! To Nobu Shishido ( 125 watt per monoblock ) tube amplifiers KT88-98 | HiFiPART STORE < /a Integrated... Students ; note the comparison with the Psu based on primarily the design... For at least 10W more delicate, natural, can bring extremely high-quality experience... A bit muddled on the Time Bandit schematic and the rest based on the of. 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For making all types of RF coils rest based on the top end compared to the -T tubes are... Dual Triode is used to drive most home speakers Hi-Fi production amplifiers Kit vacuum amp schematic... Amp power Amplifier Headphone ( Silver ) $ 1,449.38 Hi-Fi power Amplifier Headphone ( Silver ) 1,449.38. Sep 07, 2008 8:15 pm on primarily the JELabs design KT88 acoustic! Of highest rated tube amp KT88 tube Amplifier Kits circuit, output power reach! Is sold out, and two line inputs giving a wide in quantity audio 5751 SRPP KT88. About a new amp project, the screen voltage on a 6550 is only good for 400 Amplifier.! That falls somewhere in between an EL34 and a pair of 12AU7 devices for each monoblock pretty Simple IIRC of! 2011 # 11 any other amp manufacturers selling this type of design comparing these two amplifiers, there were minor. 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