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No music was playing, and the volume control was at minimum.
SO no music playing. Suddenly a sizzle sound and a medium thump.
I tried to play music, nothing. Checked the amp and it was off, no lights.
I switched the DAC IC to another preamp, and after a few minutes of fooling around at the amp (Bryston 4B-SSTē) with the power cord and on/off switch, the amp came back on with no damage.
So... I am assuming the tube preamp lost a tube with some major fail? Causing the amp on down the line to self protect and shut down big time. (the amp is fine and I am now playing music.. whew!)
I wonder if the preamp power supply went? or is it like 99% just a tube going to tube heaven?
This just happened.. So no I have NOT pulled it out and inspected the tubes.
I have alternate new tubes.. I had just replaced them about a year ago. And after, once in awhile the preamp would make some 'tube ouch' noises.. But only a few times, then the scratchy noise would go away.
Just wondering. I would hate to have to send the VAC Standard back for repair...
I do not need other advice.. just a thought about 'is it a tube? or probably something in the power supply?'
So yeah I am asking for reassurance it is just a tube... Not a $1,000 repair bill...
I will find out myself at least within a few days.. I have to get up the energy to remove the preamp from the rack, take off the cover, change the tubes, test it... yadda yadda...
Only at times when something goes bad do i again realize what a panic I would be in with NO MUSIC....
I have plenty of sources. And even a few preamps.. But only one amp.
When I could not get the amp back on.. I was staring at weeks with no music... Yikes.
Follow Ups:
While it is possible that there was a tube failure- it is more likely that something else failed and sent DC down the line to the AMP causing the amp to shut-down.
The something else that failed is most likely a cap-
but could also be a regulator or diode -
If you have a DMM - you could try to see if there is DC on the Main Output from the Pre-amp-
Otherwise describe the problem to VAC and see what they say...
Good luck-
Happy Listening
I think it was a tube.
Even one with some problem might shut down the amp.
So I repleed the tubes.. all 4 with new ones.
The old tubed 'looked OK' (to my utterly untrained eye) but new ones went in.
Reconnected everything and playing as I type.
As I wrote, previously the tubes made some crackle type noises.. Every now and then. I actually stopped turning the preamp off to avoid the crackle.
Anyway, it was almost nothing... Just some tube or other.
I have no way to test the tubes...
Other possible things may have been an insect getting on the wrong part in the amp. Or a cosmic whatever event.
So far, the tube swap seems to have solved it.
Beyond that I have no worry about it. "Other possible problems will have to wait until they actually manifest". (I am no worrywart)
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