Hoffman Amplifiers Tube Amplifier Forum

Amp Stuff => Tube Amp Building - Tweaks - Repairs => Topic started by: dscottguitars on March 06, 2018, 01:10:48 pm

Title: EL84 Quad switch
Post by: dscottguitars on March 06, 2018, 01:10:48 pm

Hi, I am considering building an EL84 PP amp with switchable two tubes to four tubes (parallel). I don't have a schematic to share, but I think the power section is somewhat standard. I plan on using a cathode bias.


What would be the best to use in the switch? the plate wire, input, or cathode? 


Thanks,


Daniel

Title: Re: EL84 Quad switch
Post by: sluckey on March 06, 2018, 01:19:13 pm

I've seen a lot of 36W EL84 amps that switch cathode resistors. Like this...

http://www.ceriatone.com/ceriatone/wp-content/uploads/2016/08/36WNewCeriatone.jpg

Title: Re: EL84 Quad switch
Post by: dscottguitars on March 06, 2018, 02:13:29 pm

That looks good and simple too. Thanks...