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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
mds's avatar
mds
119 posts
 
I have had a Calypso about 4 years and never had the volume change after the preamp was turned on. Only time it ever changed was substituting a lower gain tube such as a 6dj9 for a 6922. As far as tube hiss goes, I never have had much from any tube I have used. The one time I had some tube hiss from about 2' away from the speakers I changed the jumpers in the calypso and reduced the gain by 12 db which got rid of the tube hiss.

You could call Aesthetix and get their opinion on your problem.
lak's avatar
Ag insider logo xs@2x
lak
4,640 posts
 
Rapogee,
Is your Aesthestix Calypso Preamp plugged into a line conditioner or the AC directly from the wall?
rapogee OP
256 posts
 
My is plugged into a regenerator by PS Audio. Probably going to try a few things there, never thought about my AC but I am pretty sure it coming from the pre...... but will try that for sure
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