Page 1 of 1

Bias?

PostPosted: Tue Jul 08, 2014 6:16 pm
by JimDaBomb
Does the 6B4G GSG need biasing? Can it be biased? I'm clueless about this stuff. I'm guessing it doesn't as there are no pots to do so but perhaps there's another way I don't know of?

Re: Bias?

PostPosted: Wed Jul 09, 2014 3:30 pm
by EWBrown
The bias voltage is generated by the current flow through 900 ohms "cathode" resistor, it sets the 6B4G's biasing (K to F voltage differential)

This is also known as "self biasing", no adjustments necessary, as would be with fixed biasing.

HTH

/ed B

Re: Bias?

PostPosted: Wed Jul 09, 2014 5:41 pm
by JimDaBomb
Awesome, good to know. I was confused since I had read somewhere that SET amps didn't need biasing but then I was looking at Line Magnetic amps and seeing their SET amps with bias pots so I wasn't sure what to expect. The GetSetGo I built is the first tube amp I've ever owned so I still have a lot to learn. Thank you.