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Post by kruzty on Nov 2, 2005 9:08:04 GMT -7
This isn't about my Z amp, but I thought I'd ask this here because the answer might help someone else out in the future with any tube amp:
The last couple of times I've played my THD BiValve I would play for 10 or 15 minutes, then the volume would drop for 5 or 10 minutes. It then would come back to normal and seem OK for the rest of the night. Has anyone else experienced a similar problem? It doesn't seem like a typical "bad tube" problem, but I suppose it could be. If anyone has heard of a tube problem like that, was it a pre-amp or power tube problem?
Thanks for any info, Andy
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Post by bluzsteel on Nov 2, 2005 9:54:16 GMT -7
could be voltage problem as well
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Post by myles on Nov 2, 2005 11:55:58 GMT -7
This sounds like a tube problem as I have seen this on the Bi Valve and Univalve.
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Post by kruzty on Nov 4, 2005 6:36:56 GMT -7
This sounds like a tube problem as I have seen this on the Bi Valve and Univalve. Thanks Myles. Has it been pre-amp tube problems that you've seen? Also, is that something unique to those amps or can that symptom occur with any tube amp? I just thought it was odd that it started working again instead of just degrading and finally dying. Thanks, Andy
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Post by bluzsteel on Nov 4, 2005 10:52:45 GMT -7
if its at a gig I would say low voltage, its happened plenty of times to me
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Post by kruzty on Nov 4, 2005 11:18:38 GMT -7
if its at a gig I would say low voltage, its happened plenty of times to me Thanks for your suggestion bluzsteel. I thought of that, but it happened on two consecutive nights in two different places. One was at someone's house that I have never been to before and the other was in my basement using the same outlet I have for months. That and the timing of it (both times it happened after a couple of songs and then came back to life for the rest of the night) made me think it is something other than voltage. I've changed a couple of tubes and have used it once since without the same problem. About voltage problems at gigs though - do you use a voltage regulator now, or just deal with it?
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Post by bluzsteel on Nov 4, 2005 13:13:30 GMT -7
Ive been dealing with but just ordered a Furman AR-15, sometimes my amp sounds like crap because of lower than 120V
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Post by bukowski on Nov 5, 2005 20:07:03 GMT -7
hey bluzsteel keep us posted on the ar15 I've been eye balling something like that for a while , its pretty bad some of the crap that comes out of the wall and the amp no likey
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Post by myles on Nov 8, 2005 8:17:32 GMT -7
This sounds like a tube problem as I have seen this on the Bi Valve and Univalve. Thanks Myles. Has it been pre-amp tube problems that you've seen? Also, is that something unique to those amps or can that symptom occur with any tube amp? I just thought it was odd that it started working again instead of just degrading and finally dying. Thanks, Andy Andy, This can happen on any tube amp. You may be losing heater voltage on one of the tubes so maybe remove and re-insert the tubes also. This can be a preamp or power tube problem but in the UV I have seen this mostly as an output tube problem.
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Post by mikekca on Nov 10, 2005 19:40:50 GMT -7
Thanks Myles. Has it been pre-amp tube problems that you've seen? Also, is that something unique to those amps or can that symptom occur with any tube amp? I just thought it was odd that it started working again instead of just degrading and finally dying. Thanks, Andy Try cleaning the tube pins and sockets as per the FAQ on my website. Dirty/oxidized contacts are the number one cause of intermittant problems in tube amps. EVERY tube amp owner MUST have a can of spray contact cleaner like DeOxit on hand. Andy, This can happen on any tube amp. You may be losing heater voltage on one of the tubes so maybe remove and re-insert the tubes also. This can be a preamp or power tube problem but in the UV I have seen this mostly as an output tube problem.
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