Home » Audio » Group Build » throw another preamp on the fire, boys!
throw another preamp on the fire, boys! [message #30959] Sun, 13 March 2005 19:03 Go to previous message
Forty2wo is currently offline  Forty2wo
Messages: 163
Registered: May 2009
Master
Just kidding.
I got Gunievere pretty much sorted out.

First the major hum, while I was in there adding the grid stoppers I killed one of the CCS's. My guess is ESD. Thank you Colin for the spares!

Next; back were I started, hum that increases with volume them stops at max. After a bit of pokeing around I found that in my case, the body of the Radio Shzck pot needed to be grounded. Dispite the fact that can find no leakage even with my best meter. Go figure.

Now it is pretty quiet. There is still some hum with volume but considering the amount of gain and the fact I removed the sheilding troble shooting the pot, it will do untill I change to a lower gain tube...John


 
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