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Modular Amps
Egnater / Randall Modular Amps
Help - Power Tube 1 registers 0 MV on bias
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<blockquote data-quote="Scaryfast" data-source="post: 152519" data-attributes="member: 3362"><p>I have an RM100. It seems to play and sound great, but I wanted to try switching from 6L6GC power tubes to JJ EL34II tubes. I followed the instructions in the RM100 manual and checked the current 6L6 tube bias voltage. Tube 1 read 0 MV. I turned the screw both directions as far as it would go and it made virtually no difference. The tube glows but is not nearly as warm as the others.</p><p></p><p>I switched out the tubes to the brand new EL34II tubes thinking that maybe it was an issue with the tube, but it isn't. The other three tubes bias and adjust fine, but tube number 1 still does not register anything on the tester and is much cooler than the other tubes (but is glowing). I cleaned the contacts in the tube socket (twice) just to see if that was it, but that didn't make a difference either.</p><p></p><p>Any thoughts? Is this a known or relatively common issue? Again, the amp sounds awesome (I think) and is MORE than loud enough.</p><p></p><p>Thank you in advance.</p><p></p><p>[/img]</p></blockquote><p></p>
[QUOTE="Scaryfast, post: 152519, member: 3362"] I have an RM100. It seems to play and sound great, but I wanted to try switching from 6L6GC power tubes to JJ EL34II tubes. I followed the instructions in the RM100 manual and checked the current 6L6 tube bias voltage. Tube 1 read 0 MV. I turned the screw both directions as far as it would go and it made virtually no difference. The tube glows but is not nearly as warm as the others. I switched out the tubes to the brand new EL34II tubes thinking that maybe it was an issue with the tube, but it isn't. The other three tubes bias and adjust fine, but tube number 1 still does not register anything on the tester and is much cooler than the other tubes (but is glowing). I cleaned the contacts in the tube socket (twice) just to see if that was it, but that didn't make a difference either. Any thoughts? Is this a known or relatively common issue? Again, the amp sounds awesome (I think) and is MORE than loud enough. Thank you in advance. [/img] [/QUOTE]
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Modular Amps
Egnater / Randall Modular Amps
Help - Power Tube 1 registers 0 MV on bias
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