IGC 100 Hz buzz

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I've completed my first unbuffered IGC. I would like to thank to Pedja Rogic and Nick Whetstone for their support. The amp sounds fabulous.
The only thing that irritates me is faint 100Hz buzz that is audible only from close distance from the speaker (~10 cm) and it gradually disappears as the volume control is turned up.
I've used all precautions relating to grounding of the amp. The pot I'm using is cheap carbon 50k log. Could that be a culprit?
Maybe I am too fussy. What is the acceptable level of buzz?
Cheers!
 

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Nuuk,

2 toroids (1 per channel), 2 rectifiers per channel, 4 snubber caps (22nf) per rectifier, PSU box earthed, no connection between PSU and AMP enclosures.
Here's the pic.

Thanks!
 

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