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In Reply to: RE: Bad Tube Roll posted by John Brandon on October 27, 2014 at 15:36:34
You placed the plate voltage of one the the 6sn7 cathodes.
The heater was connect but only on one side.
The grid circuit was connected to one of the plates.
The only problem I see is placing high voltage on one of the cathodes of the 6sn7.
It could have arced over to the heater but I will guess that didn't happen since you say it's working now.
I think you dodged a bullet.
Plugging the wrong tube into a radio, when I was 14, is what started all this for me.
When I took it to Dwight (K6LOV and my friends father) he made me follow along as he trouble shot it.
Showing me how the wrong tube caused a high amount of current to flow burning up parts along the way.
At 59 years old now, I still can't thank him enough.
Tre'
Have Fun and Enjoy the Music
"Still Working the Problem"
Follow Ups:
Thanks. Yep the amp is working. Sounds the same as before, as far as I can tell. Would I hear distortion, or would it stop working, if there were any damage? Is it worth getting the amp checked? Not worried about having potentially damaged the 6SN7s.
John
I would say if it works and sounds fine, it's fine.
Tre'
Have Fun and Enjoy the Music
"Still Working the Problem"
If you have access to a tube tester, may want to test those 6SN7's before reusing them.
Thanks. I had the 6SN7s tested a while ago, and they were usable but not in great shape. Not really concerned if I busted the 6SN7s. Only concerned about the amp.
For future reference.
Safest way to avoid causing problems elsewhere later, given these 6SN7s weren't valuable or in good shape before the incident.
Agreed. They are in the trash.
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