Al Wrote:
How are pentode and triode configurations made on the Clemintine board?
For triode mode, you would just put in 100 ohm resistors on the board for R15 and R16. This straps the screen to the plate.
I wouldn't recommend pentode mode for this amp. To do this, you will need to supply some dc voltage to the screen. I don't think Shannon intended this as an option.
Ultralinear mode is a good choice if you have screen taps on the output transformer.
In my project, I am using chassis mount ceramic sockets for the 1625 tubes that are mounted behind the board. The plate cap will be soldered directly to the lead from the output trannie, and the screen tap will be soldered to the tube socket. The other connections (grid, cathode, and filaments) will come from the octal socket holes on the board.
JT