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BIAS PROBLEM


 
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BM



Joined: 07 Jun 2007
Posts: 45
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PostPosted: Wed Oct 01, 2008 8:44 am    Post subject: BIAS PROBLEM Reply with quote
The other day I was biasing my Marshall with my SRS duel bias probe, I decided after I was done to check the settings on the Ampeg.
First off for some reason the probe would only report on one of the el 34's...very odd, even after swapping the prob around the only measurement that shows up (when viewing from the back) is the right pwr tube
The amp is still loud as hell with no issues accept that it has the electric razor hum happening

The one tube socket that did register the bias was at 19ma!
both tubes/probe yada yada all work fine
I never bothered to check before because I thought the amp was self biasing...
should i rebias the unit?
anybody have any idea what's up with readings?
Thanks In Advance


Last edited by BM on Thu Oct 02, 2008 2:06 pm; edited 2 times in total
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BM



Joined: 07 Jun 2007
Posts: 45
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PostPosted: Thu Oct 02, 2008 2:03 pm    Post subject: Reply with quote
anyone? I've helped I don't know how many of you guys out with the schematics....
could some one gimme a hand
Thanks
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