Bias question

jamme61 · Post by **jamme61** » Sat Dec 07, 2013 2:16 pm

I have a bogner ecstasy and wanted to make biasing easier can I just add a 1ohm resistor off pin 8 to ground on each tube to measure the bias?

martin manning · Post by **martin manning** » Sat Dec 07, 2013 2:22 pm

Yes, as long as you open the existing ground paths or insert them so that the tube current has to pass through the 1R resistors.

jamme61 · Post by **jamme61** » Sat Dec 07, 2013 3:03 pm

oh that's a problem, I'd have to cut the trace(circuit board mounted). Thanks for the info

tubeswell · Post by **tubeswell** » Sat Dec 07, 2013 4:46 pm

Yes, circuit board amps are a real PITA to mod.

Phil_S · Post by **Phil_S** » Sat Dec 07, 2013 7:12 pm

jamme61 wrote:oh that's a problem, I'd have to cut the trace...

Screw up your courage or set it aside until you conger up a good work around. There's always a way.

YouTube · Post by **xtian** » Sat Dec 07, 2013 8:09 pm

You can make your own socket adaptor for checking bias, or buy one from Weber: "For those on a budget, the Bias Rite adapter head is available separately." See near bottom of page: http://taweber.powweb.com/biasrite/br_page.htm

jamme61 · Post by **jamme61** » Sat Dec 07, 2013 9:45 pm

thanks guys I do have the biasrite with two octals but its a pain in arse.have to buy more. thanks for the time

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