It is my understanding that the Pacific Valve Co only services a product if was sold by them. I would contact Ming Da direct for a service center.
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I have the same preamp, just acquired from a friend. Mine has the extreme mod package loaded up with Vcaps..... These mods were performed by Response Audio out of NY. Wonder if you can google for the link. Maybe they can help. I've owned numerous tube preamps - TAD, Audible Illusions, Counterpoint, VTL. This modded MC-7R betters all of my previous preamps. Get yours fixed and hold onto it. It's a keeper
You won't find the Response Audio web site as it has be closed down. You can contact me directly through a new site www.ra-ny.com
We do not advertise mods but will accept them in from those who inquire. Being the designer for Purity Audio Design, my mod time is limited these days.
Purity Audio Design