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Loud buzz / hum on my Aesthestix Calypso Preamp?

Help needed - Originally it was very soft and now it’s getting loud right from the get go on both channels from the speakers.
Changed tubes from Mullard to EH Gold pins and each time its turned on, the hum does not go away and the volume generally is much softer than normal probably by 5 to 10db give or take. Occasionally its present only at the beginning of start up, probably 2 minutes and it slowly goes away completely. Placed the original Mullard tubes back and the hum is still there. Power amp is via ARC VS110 unbalanced. Its still present, loud enough to frustrate! Did anyone have issues with EH tubes with their Calypso preamp?
Any suggestions?
rapogee

Showing 1 response by sufentanil

sufentanil's avatar
sufentanil
782 posts
 
Try routing the preamps L channel to the R input on the amp, and the R preamp output to the L input on the amp. If the problem switches speakers, then the problem is in the preamp or the source. If the problem does not switch speakers, then the problem actually lies in the amp rather than the preamp.

That's my recommendation before you assume it's a problem with the preamp.

Michael
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