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Is this the sound of tubes going bad or something worse?
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j2dafo
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#1
30th January 2013
Old 30th January 2013
  #1
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Is this the sound of tubes going bad or something worse?

Yesterday I fired up a Traynor YBA 2A. Great bass amp and I love putting p90 guitars and Gretsch guitars through it and turning it up to 11. Alas, doing so yesterday resulted in a weird vibrato to the sound. As soon as the amp started to break up, you could hear a warble that became more distinct as you turned up.

Tubes are a pair of old Mullards for pre and Groove Tubes for power. Bought the power tubes back in 2008 but the amp has very low hours since then.

Thoughts?
#2
30th January 2013
Old 30th January 2013
  #2
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Clips or it didn't happen.

No, seriously, it's hard to tell. A recording would go a long way to help identify the problem over the internet, but even that may not help unless someone has heard that exact same sound before. I've not heard a bad tube create a vibrato sound. Tremolo, maybe. In any event, the first thing I would try is to swap out the tubes for known good ones, and see if the problem goes away. If it does, then you'll know it was a tube problem. If not, take it to a tech.
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4th February 2013
Old 4th February 2013
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That warbly tone reminds me of a MESA amp that went south during a gig. It was the power supply.
#4
6th February 2013
Old 6th February 2013
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Definitely try swapping all the tubes out for known good ones and see what happens. Even with low hours, some tubes just aren't cut out for the test of time.
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