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U67 fading away
Author: Michael Blackburn
Date: 08/19/2017
Have just fired up an old U67 serial no 659 and it works with vocals for about 5 - 10 seconds then the audio fades away, squealing sounds as it fades, a good 30 or 40dB down. This only happens when i talk/sing into it. Without an audio source, it is working. Once it has faded away, it takes about 30 seconds with no audio source to return to full volume. I have replaced the EF86 tube, trying several, they all have the same problem. The mic is original, no parts have been replaced, could it be due for a cap replacement? Any other ideas?
Michael  
 
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