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Post subject: Custom Vibrolux squeal in reverb
Posted: Mon Feb 22, 2010 12:25 pm
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I just bought a used Custom Vibrolux Reverb. It looks brand new and is probably one of the best sounding amps I've ever heard. The only problem is the reverb. It has a hum (or buzz) until about 2-1/2 on the knob and then it turns into a high-pitched squeal the rest of the way up. Any ideas where I should start looking?


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Posted: Mon Feb 22, 2010 4:32 pm
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I would start by substituting a good tube in the V4, then the V3 position. Art

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Posted: Tue Feb 23, 2010 11:14 am
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I second the suggestion that you try changing a tube first. It is the simplest test you can make without taking the chassis out of the cabinet.


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Posted: Sun Mar 07, 2010 7:06 am
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I had the same problem with my Custom Vibrolux. First, I took out the tank and cleaned all the connections. Second, I purchased a pair of JJ tubes for V3 (ECC81) and the V6 (ECC83S current balanced) phase inverter position. I also replaced the other 4 pre-amp tubes with JJ's (ECC83S) which softens the break-up and warms this amp up considerably. No more sqeal in my reverb and the amp is generally much quieter overall. Hope this helps!


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