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Instruments and Amps Everything that makes music, Especially including instrument amps.

Mesa/Boogie Rocket 44 tube amp repair
Mesa/Boogie Rocket 44 tube amp repair
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Old 16th September 2018, 08:48 PM   #11
cmjohnson is offline cmjohnson  United States
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Join Date: Dec 2004
Location: Florida
I don't think that I can trust the B+ supply to provide enough bias current as well as B+ current if I were to try it.

I do think it's kind of wasteful to be using a 70 volt tap on a transformer to provide power to a circuit that needs not more than 15 volts of bias under any circumstances.

I'm almost tempted to just obtain a much smaller transformer, anything over 15 volts, and drop that in to become a separate bias supply and also tap 3 volts off for the switching, too.

Mesa transformers are cheap, they say...but this particular one from Mesa is about 168 dollars. For that money I can get a Mercury Magnetics version!

561134 is the part number of the Rocket 44 power transformer.
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Old 11th February 2019, 02:56 AM   #12
cmjohnson is offline cmjohnson  United States
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Join Date: Dec 2004
Location: Florida
I forgot to post a resolution to this amp's problem.

Lesson learned: Never assume connections are clean enough especially when it involves high voltages.

On this amp there are three very closely spaced solder pads where the HV and bias supply is jumpered with wires to the power amp board.

For the voltages involved I think it's pretty dumb to have such close lead spacing.

Turns out there was some conductive dirt between those three solder pads.

A good brush cleaning with isopropanol followed by a rinse and dry cycle CURED ALL PROBLEMS in the amp.

That was it.
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Old 13th February 2019, 05:24 AM   #13
djgibson51 is offline djgibson51  New Zealand
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Join Date: May 2010
Location: Hawkes Bay
Thanks for the update. Lesson noted.
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