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Modular Amps
Egnater / Randall Modular Amps
UPDATED:Please HELP! My RM80 has Failed!
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<blockquote data-quote="kc2eeb" data-source="post: 109060" data-attributes="member: 811"><p>John,</p><p> Just glowing orange is enough to have a problem. </p><p>Try this: After you adjust the bias, leave the meter connected and play through the amp. The current will go up (It's supposed to) the louder you play. The meter is showing you the current the tubes are drawing. (Not absolutely accurate, but close enough.) You should see up to 120-140ma or so. If it still draws that kind of current after you stop playing, then there's a problem. Check the screen resistors (1K 5 watt) big rectangular </p><p>white ones. They should read 1000 ohms +/- 10 %. </p><p>Look very closely at the board for any signs of arching, black traces, tiny bits of soot, etc.</p><p>I also sent a PM to you.</p></blockquote><p></p>
[QUOTE="kc2eeb, post: 109060, member: 811"] John, Just glowing orange is enough to have a problem. Try this: After you adjust the bias, leave the meter connected and play through the amp. The current will go up (It's supposed to) the louder you play. The meter is showing you the current the tubes are drawing. (Not absolutely accurate, but close enough.) You should see up to 120-140ma or so. If it still draws that kind of current after you stop playing, then there's a problem. Check the screen resistors (1K 5 watt) big rectangular white ones. They should read 1000 ohms +/- 10 %. Look very closely at the board for any signs of arching, black traces, tiny bits of soot, etc. I also sent a PM to you. [/QUOTE]
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Modular Amps
Egnater / Randall Modular Amps
UPDATED:Please HELP! My RM80 has Failed!
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