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AVA Ultravalve schematic?

Coupling caps are the caps on the far left and right on the board, 4 identical caps on each side. Look up "yellow sheet mod" for the rectifier diode. I wouldn't experiment with the caps, you may wear out the soldering pads, unless you just want to up the voltage rating. Try to find out what they are rated for. Different brands were used. Honestly mine is probably equipped with descent run of the mill caps and it sounds wonderful as is.
 
Destructor said:
Coupling caps are the caps on the far left and right on the board, 4 identical caps on each side. Look up "yellow sheet mod" for the rectifier diode. I wouldn't experiment with the caps, you may wear out the soldering pads, unless you just want to up the voltage rating. Try to find out what they are rated for. Different brands were used. Honestly mine is probably equipped with descent run of the mill caps and it sounds wonderful as is.
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Thank you for the reply. On my version, there are 4 pairs of blue plastic box film capacitors (8 total). they have a high value for coupling caps (2.2 uf). They look like they are glued onto the board, so I'm not going to mess with them. I'll look into the rectifier diode. Mine sounds wonderful as well, but it has eaten a couple of rectifier tubes.
 
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