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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
rapogee OP
256 posts
 
Please note that there is no sound huming from the preamplifier, its coming through the speakers loud and clear.
sufentanil's avatar
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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
lak's avatar
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lak
4,663 posts
 
Check the voltage coming ot of your regenerator (by PS Audio) and see if it's normal voltage or in the normal range or higher, OR plug your preamp into a wall outlet (just for the heck of it) as see if the problem continues. I have found that my Aesthestix Calypso is very sensitive to any voltage that is elevated. Please report back one way or the other, I'd personally be interested.
hasmarto's avatar
hasmarto
203 posts
 
I have no experience with the Calypso, but when the capacitors in my PS Audio P500 were dying, there was similar loud buzz/hum coming from my speakers.
rapogee OP
256 posts
 
Hmmmm, I will try a few suggestions this weekend and also the suggestion from Aesthestix, told to remote all inputs except the outs to the power amp and see if the hum is still there. I will also check and see if the gain jumpers are fulling locked in. Thanks

Will post once evalueated

R
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