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Ming Da MC-7R faulty pre/amp?

I need help resolving a problem with a Ming Da MC-7R pre/amp I just bought from an AudiogoN member. I am using it with a Kavent (Sheng Ya)P-2200 poweramp (it should be a perfect match) When I hooked the pre/amp up, turned it on and then turned the amp on, the problem light shows up on the amp and the speakers produce a high pitched noise and the amp shuts down. This does not happen if I power up the amp only. It is also fine with my Blue Circle pre/amp. I didn't try swapping all the tubes as it uses (2) 12ax7's (2) 12au7's and a 5u4g rectifier. I could only swap out the 12au7's. Any ideas? I am hoping it is only a bad tube. Thanks for the help.

Roy



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Topic - Ming Da MC-7R faulty pre/amp? - lockman 18:19:55 09/30/05 (1)


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