Repair of Cayin HA-2 tube headphone amp


I have a Cayin HA-2 headphone amp which worked for several months, until the audio sound became almost minimal. You can still hear music, but just barely. This may be a problem with the volume control. Does anybody know a reputable repair company with experience to handle this kind of problem?

Thanks.
hayw
Best to ship it back to Steve, the Cayin USA distributor. Steve always provides the best customer service. He will most likely do the repair himself, and is an expert. Go to the CayinUSA web site and e-mail him. I've visited with Steve many times and I am sure he can take care of your problem, at reasonable cost.
Rrog, And you know this how?

Hayw, I agree with Buconero. Contact the USA distributor.