The pentode is controlled with the pre-amplified signal and acts as a power amplifier ... schematic should be all you need to get started. If you want some more background information about tube ...

There’s a mystique among both audiophiles and musicians about vacuum technology, thus having a tube amp still carries a ... triode preamp and a single power output tube. The transformers are ...

After a brief review of the history of the K2-W vacuum-tube op amp, an LTspice model is used to create its schematic in ...

This is the matching preamp for the Eastern Electric Mimimax Power Amp which I reviewed quite a while back ... and one of type 6AX4/EZ90. The rightmost tube (that above the input selector) is for the ...