• WARNING: Tube/Valve amplifiers use potentially LETHAL HIGH VOLTAGES.
    Building, troubleshooting and testing of these amplifiers should only be
    performed by someone who is thoroughly familiar with
    the safety precautions around high voltages.

Using Telefunken EL-156 in Dynaco Mark III amp

A few years ago I slapped in some Chinese EL156 tubes into my rebuilt Dynaco Mark IIIs. If I remember correctly I had to tie G3 to the cathode (pins 1 & 8) since the EL156 is a true pentode. Perhaps this is not an issue with the original Mark III circuit, but as I said this was a rebuild with all new sockets, boards, and hardware.
 
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