Hi all
I've got one of the rev D ST35 boards and I'm planning to put together something using salvage and leftover parts from my parts bin. Here's my plan so far.
I have an old Calbest EL84 amp that I'm going to salvage the iron from. The power transformer is an enormous filiment ps intended for tube rectification. Unloaded the voltage is about 350-0-350. I intend to use a 5U4GB for rectification. I've already got a 33uf 500V cap ready for C9. The OPT's are 8k ohm with 8-16-32 ohm taps. Pentode only. I've also got a JJ 250uF 500V (for C12?), two Panasonic 120uF 500V caps, two .1uf caps of unknown origin, mabey a .1uF orange drop and lots of older (than me) carbon resistors. I bought some tube sockets for point-to-point wiring, but I'll fudge them in somehow.
I'd like to replace the 12AU7 with a 6CG7. I won't be able to solder the tube sockets to the board so it shouldn't be difficult to wire the heaters for 6.3V.
Anyone try a 12AT7 instead of the 12AX7?