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Tubes Asylum Questions about tubes and gear that glows. FAQ |
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Tubes Asylum Questions about tubes and gear that glows. FAQ |
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In Reply to: Question on bias on EL34 PP amp posted by migene on October 12, 2000 at 19:25:02:
Hi,
Wrong sort of tube glow :-)
Has that tube always been like that?
Never the less: Check if there is some sort of low value cathode resistors: if then remove the tube and check its value. Check all the connections at the tube socket: The G1 grid is next to the G2 grid, and if there is any contact you will have +400V on the grid :-). Do also check the decoupling cap for the G1 for that tube (that isolates it from the splitter/drivers b+) as this will also give some +100V of bias ;-).
Shit: where may one find a scheeme???
AND: TAKE CARE, LETHAL VOLTAGES...
/Pär
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Follow Ups
- Re: Question on bias on EL34 PP amp - Pär 23:21:24 10/12/00 (1)
- Almost certainly a dud bias resistor - Simon Linton 00:24:49 10/13/00 (0)
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