New JJ 5U4GB whines on warm up.

melvin

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Join Date: Aug 2009

Posts: 182

Location: Seattle, Washington
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#1

New JJ 5U4GB whines on warm up.

09-28-2010, 07:25 PM

Anybody else have experience with the 5U4 made by JJ making mechanical noise when warming up? I'm wondering if this is normal.

I ask because one I got a couple of months ago would do it and it failed after about an hour. This next batch I just got all do it too.
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tubeswell

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Join Date: Feb 2007

Posts: 4229

Location: Wellington NZ
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#2

09-29-2010, 04:15 PM

Yeah I tried one a couple of months ago and it whined a bit and also buzzed/hummed/rattled a bit. I sent it back.

Building a better world (one tube amp at a time)

"I have never had to invoke a formula to fight oscillation in a guitar amp."- Enzo
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