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In Reply to: RE: Now lets try Willie's 26 pre...... posted by vinnie2 on August 02, 2015 at 17:46:30
The 26 is fairly easy to get quiet if you have ST shaped tubes . All the globes I have tried were horribly microphonic . I would suggest looking at the filament voltage , it may need backing off . Are you using AC on the filaments ?
Al
Follow Ups:
Yes, I am using AC. It worked fine on the 27 circuit. How do you back off of 1.5 volts?
Edits: 08/03/15
Suggest going to DC fils , AC fils on a DHT linestage is never a good idea . By backing off I mean reducing , get a DC fil supply going and try at 1.5V , if this gives similar issues use a dropping resistor and try at 1.4V etc . I find that with some DHT this is the only way of killing microphony , with AC fils I would imagine there will be a lot of filament noise which will be difficult to get rid of . Easiest way is to use a high capacity 1.5V alkaline D cell and see if this helps mattersAl
Edits: 08/03/15
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