how to modify m15 to accept 6v6?

Re: how to modify m15 to accept 6v6?

I think the only change (except for changing to octal sockets) would be to change the cathode resistor to an appropriate value.

Check some 6V6 tube data sheets, they usually contain recommended cathode resistor values for various lplate voltages.

According to this: http://www.mif.pg.gda.pl/homepages/fran…084/6/6V6GT.pdf
a cathode resistor of about 250 ohms should work in the M15.

(I haven't tried this, so don't take my word for it...)

Re: how to modify m15 to accept 6v6?

Hi,
that's right, just take the appropriate resistor value (5W) and a new bypass cap and wire the octal sockets in parallel to the existing ones (meaning to connect the right pins with each other, not really parallel pin by pin ;)). Doing it that way, you have to remove one pair of powertubes respectively.
Regards,
Martin