In Reply to: RE: Filament bias and DHTs transformed my system. posted by tube wrangler on August 29, 2012 at 01:04:03:
"IF one buys the best caps, resistors and is VERY CAREFUL-- he can get cathode bias to work. It IS difficult. There are some advantages to it-- the bias provided by the cathode is signal-related, it's not fixed."
Can you please explain how a bypassed cathode resistor causes a signal related bias voltage?
"These [cathode resistors] must be within 1/100th of a percent of each other, so buy a few. If you don't get this close, you'll have two signals there."
If the cathode resistors are bypassed, there is no signal (AC) flowing through them, just DC. The signal (AC) flows through the caps, the DC flows through the resistors. You have two DC paths but (in your case with 6 bypass caps) 6 signal (AC) paths.
Tre'
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Follow Ups
- cathode resistor - Tre' 08:01:44 08/29/12 (3)
- RE: cathode resistor - Cleantimestream 08:37:16 08/29/12 (2)
- RE: cathode resistor - andy evans 09:46:06 08/29/12 (1)
- RE: cathode resistor - Cleantimestream 12:45:38 08/29/12 (0)