TT Kit YAH100 - Yet Another Hiwatt

• David D., 11/15/2021
  I've built the kit to use with an active electric bass and a 4x10 SWR Goliath cabinet. Man, this thing is LOUD when turning up enough to get power stage distortion - I'm sure it would be sufficient for gigging in small to medium clubs. I've bought a power attenuator to get distortion without going deaf. The clean tone and the distorted tone are both fantastic, plenty of adjustment possibilities as well. I'm going to try 6CA7 tubes as well, eventually. I am curious if a passive bass or guitar makes it harder to push preamp to distortion; I have to crank most preamp knobs with the active bass.
  
  Regarding assembly: this was definitely tricky. I absolutely would NOT recommend it for non-detail-oriented people, also NOT for beginners. There are so many tiny details that must be right! But if you have several (simpler) high-voltage projects under your belt and feel confident enough, this amplifier is absolutely a dream to play and the kit is excellent. I was missing 1ohm resistors for bias measurement but used some 10ohm from my own stock. But overall the quality and content of the kit is very good, and the cost is about 1/4 of buying a vintage (or a remake/copy) Hiwatt DR103. The assembly (not including prep work) took about 30 solid hours of assembling, wire cutting, soldering, voltage testing, etc. stage distortion - I'm sure it would be sufficient for gigging in small to medium clubs. I've bought a power attenuator to get distortion without going deaf. The clean tone and the distorted tone are both fantastic, plenty of adjustment possibilities as well. I'm going to try 6CA7 tubes as well, eventually. I am curious if a passive bass or guitar makes it harder to push preamp to distortion; I have to crank most preamp knobs with the active bass.
  
  Regarding assembly: this was definitely tricky. I absolutely would NOT recommend it for non-detail-oriented people, also NOT for beginners. There are so many tiny details that must be right! But if you have several (simpler) high-voltage projects under your belt and feel confident enough, this amplifier is absolutely a dream to play and the kit is excellent. I was missing 1ohm resistors for bias measurement but used some 10ohm from my own stock. But overall the quality and content of the kit is very good, and the cost is about 1/4 of buying a vintage (or a remake/copy) Hiwatt DR103. The assembly (not including prep work) took about 30 solid hours of assembling, wire cutting, soldering, voltage testing, etc.
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• Alain L., 11/06/2020
  Je l'utilise avec un baffle que j'ai fait moi-même y compris l'ébénisterie équipé de 4 haut-parleurs Jensen Tornado 12". Je l'ai essayé avec une Stratocaster et avec une basse Aria pro II. Un son très précis avec une grande dynamique. Une merveille....
  J'ai eu aussi une résistance de 100 ohm au lieu de 10 K pour le circuit de bias. Je me suis débrouillé avec mon stock. Stratocaster et avec une basse Aria pro II. Un son très précis avec une grande dynamique. Une merveille....
  J'ai eu aussi une résistance de 100 ohm au lieu de 10 K pour le circuit de bias. Je me suis débrouillé avec mon stock.
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• Boris G., 08/13/2020
  I use it with my basses with 15" and 2x10" cabs.
  
  But I play guitar too. I will try it with guitar on day, if I found (or build) the good cab!
  
  The sound is amazing, no buzz, no humm ! my wiring and my welds could be improved, but it sound.
  
  The only thing I have noticed during the wiring is the error on R3' and R4' value (bias pcb). In the components I've found 100 ohm instead of 10k. But I managed to change it on my personal stock.
  
  Thanks to given me the opportunity to build an amp of legend at reasonable cost! cab!
  
  The sound is amazing, no buzz, no humm ! my wiring and my welds could be improved, but it sound.
  
  The only thing I have noticed during the wiring is the error on R3' and R4' value (bias pcb). In the components I've found 100 ohm instead of 10k. But I managed to change it on my personal stock.
  
  Thanks to given me the opportunity to build an amp of legend at reasonable cost!
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• Daniele G., 03/11/2020
  Great tone, great components and smart bias pcb to check and set your quartet. Check the colors of the OT: purple 4ohm, brown 8 and grey 16. If you use only the layout remenber the black connection on the board between R20 and R23. use only the layout remenber the black connection on the board between R20 and R23.
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