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Gorm

Ampsandsound - Stereo 15 SE Feedback Issue

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Hi guys,

 

A problem developed with my Ampsandsound Stereo 15 tonight. When I started it for the first time since last weekend, there was now a noticable feedback buzz instead of the usual dead silence. As i approached the unit, I discovered that the feedback became louder when I moved my hand towards the 12AX7 position. As I moved my hand back and fourth from the 12ax7 I could control the "volume" of the feedback. So, I powered down the unit and replaced it with another 12ax7. It also exhibited the same behavior. I don't believe this is any sort of ground issue, as it was perfect for nearly half a year before today.

 

Anyone have any ideas?

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^^^^^

==== I think it best to get with Justin Weber, the amps builder. He should know better than anyone here —

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Just in case....  if you have any lights on a dimmer circuits  try turning them off and see if noise stops.

 

miketn

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I ended up shipping it to Justin. I could slightly tape the 12ax7 tube and the sound immediately reflected in the speakers. I was able to replicate this behavior with multiple 12ax7 tubes.

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So it WASN'T  a bad 12a?

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Could just be a bunch of microphonic tubes... I had some 6922 tubes that I had to filter through to get one that was quiet and non microphonic.

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I haven't received yet, Ill get it on the bench and will find the culprit. 

Im my experience... 150+ amps or so, less than 10 have every had anything actually wrong with the amp... tubes tend to be the culprit. Either way Ill have her back to singing ASAP. 

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^now that's nice!

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