EL34 in Bassman?

[Oddvar]

Hi.  Is it enough to change the 470 ohm resistor to 1,5 k 3 or 5 watt resistor on the output tubesockets and do the redo the bias, jump the 1 and 8 pin to use El34 in the Bassman 59?

Could you leave the 470 ohm in there, maybe make it into 5 watt?

[kagliostro]

Do you remember that the 6L6 requires 900mA each for filament and EL34 1.5A each ?


Franco

[HotBluePlates]

Bias will probably come up differently, as the EL34 has more Gm than the 6L6. So you'll want the adjustable bias circuit to have enough range.

In a related issue, because the EL34 has higher Gm it won't take as much drive signal to get full output and into distortion. But you probably wanted that. 

The suppressor of the EL34 is not internally connected to the cathode. So you'll need a wire running from pin 1 to pin 8.