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I built it and was very unhappy. The drive to the 300B is very non-linear. I completely modified it, which involved a lot of track-cutting, joining and totally new components. I also used only one side of the 6SN7, to give a single tube driving circuit.
I converted my first board to change the direct couple between stage 1 and 2 to capacitor couple between stage 1 and 2. No trace cuts. Post 124, 125, in above link.
I am working on a conversion to Cascode per Stephie's design. Here:
Boyuurange A50 300B Review + Mods Series
Again, no trace cuts.
The 5U4 has to be mounted by rotating 1/9 turn clockwise relative to the other tubes. (Post 79 of the thread in my post above).
I am working on a conversion to Cascode per Stephie's design. Here:
Boyuurange A50 300B Review + Mods Series
Again, no trace cuts.
The 5U4 has to be mounted by rotating 1/9 turn clockwise relative to the other tubes. (Post 79 of the thread in my post above).
Typo in previous post, 1/8 turn, not 1/9.
Lots of ways to modify the board.
How did it turn out? Happy with it?
Lots of ways to modify the board.
How did it turn out? Happy with it?
Yes, very happy. I basically changed it to my own design, that I have used on my main amp.
Hi, I built it 2 years ago and it hums quite a lot. I ended not using it anymore and went for the cheaper one mentioned by thegimp