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Receiver shut down only when using phono preamp. I recently added a Music Hall mmf-5 turntable to

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I recently added a Music Hall mmf-5 turntable to my system with a Dynavector MC cartridge DV-10X5. I also added a Antique Sound Lab Phono LUX DT phono stage. I am connecting it to a Denon 2803 AVR using the VCR2 input. After playing the phono at high volume for a relative brief period of time(4-5 songs), the "protection circuit" trips and the unit shuts down. The unit is hot at the time it shuts down, but does not shut down with any other inputs(ie CD, DVD, DVD audio and SACD) at even higher volumes.I have tried the TV input on the receiver, changed out the RCA connections and tried another Phono LUX DT phono stage. All with the same result; the unit shuts down. I had the phono stage bench tested and installed in another system with no problems detected. I added a second ground from the phono stage directly to the ground on the turntable with no success. I put a large floor standing fan to move the air around the unit and it did not help. The Denon receiver is in a cabinet with 5 1/2" clearance on top and 3" on each side.I do not believe I have a problem with the receiver, because it works with all of the other inputs at high volumn. If anyone has any suggestions I would be most grateful.

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