Hoffman Amplifiers Tube Amplifier Forum
Amp Stuff => Tube Amp Building - Tweaks - Repairs => Topic started by: Matty_V on July 29, 2011, 08:26:02 pm
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I feel really stupid. I just realized that for the past...I don't know...3 or 4 years my 2204 has only been running on one output tube. I just pulled v5 and sure enough no change in sound. :BangHead: Its never been my main amp so I don't really mess with it. Now I see why I've never really liked how it sounded.
I gotta do some investigating but I'm half thinking I arced the OT way back when I got it. Back then I had no knowledge of tube amps, or that they had to have a speaker load when turned on. The voltages and bias checked out a couple months ago, anything else I should look/test for?
Sometimes I worry about myself :dontknow:
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I would pull the two output tubes and remember which one goes to which socket or you'll want to re-bias possibly. Then with the amp off/unplugged and drain filter caps if necessary - put your VOM on a low resistance setting and check your pt's primaries. Measure both outer legs and then look for appx 1/2 from each leg to the center tap. If there's a descrepancy like finding a short or open then you'll know for sure that you messed it up. If all measures out, then start looking elsewhere for something.
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I'll give that a whirl when I get around to it, thanks! I flew my first cessna today so my head is thinking elsewhere! :icon_biggrin: