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I have a vintage Rembrandt 2 channel guitar tube amp model 462 that the 12ax7 tube won't light up. All other tubes light up but that one tube. Any ideas on where to begin?

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It is only a pre-amp tube. try putting a different one in....
is it a head? or a combo. I had one that I liked that I sold because I needed the $$$. if you have a pic of the back...send it to thundervert@charter.net. If you don't have any other tubes, let me know. I've got a bunch, and I'll pop one in the mail. If any tube doesn't light up, you've got either a socket or input problem.

best,


Tom

Posted on Jan 24, 2013

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Posted on Jan 02, 2017

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SOURCE: Have a Crate V50-112.Have had it for 1 year.

Check for bad tube... it HAPPENS that brand new ones fail... USUALLY if they last 50 hours, they will last for the expected life. The bad tube would likely NOT be the main power tubes, as the amp would still run on one cylinder...

Posted on Feb 02, 2010

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SOURCE: I have a Crate v32

I don't know how you know the tubes are good... It is possible they are microphonic... try tapping them with a pencil (only need to worry about the smaller ones).
Beyond this look for cracked circuit board or bad solder... especially near the control pot leads. This is a common problem. Look for cracks near the booard mounting points.

Posted on Dec 24, 2010

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Do you turn on standby every time and wait for the tubes to heat up first? If you don't, it can severely damage the tubes.
But a common cause of this could be just old tubes. Like any other piece of technology, tubes get old. If you like to play your amp LOUD then they wear out a lot quicker. You have to replace tubes every now and then. Because I'm not there to check out your amp, I can't give you an exact answer but it sounds like that's the problem. This isn't always a bad thing. You can make the sound of your amp exponentially better with nicer, new tubes. Your amp has 12AX7 tubes. Very common tubes to use actually. I'm not sure what kind of music you play, I'm assuming mostly rock and blues. But here is a list of tubes and reviews on them.
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