KR 6400 bad preamp?

HeyJB · Mar 24, 2014

My knowledge of older stereo equipment is very limited, so please excuse any ignorance

I dug a KR 6400 receiver out of my parents' basement, circa 1978. When I hook up my turntable to either phono inputs the sound was distorted and volume would cut in and out when jiggling dials. Using the turntable's preamp and connecting to the Aux port works fine.

Is this likely a bad preamp board in the receiver?

EchoWars · Mar 24, 2014

Chances are that the switches need a thorough cleaning with a good deoxidizing cleaner, like Caig DeOxit.

Robisme · Mar 24, 2014

What model turntable? You mention it has a preamp. When you connected it to the phono inputs, did you use the preamp?

Rob

HeyJB · Mar 25, 2014

EchoWars said:
Chances are that the switches need a thorough cleaning with a good deoxidizing cleaner, like Caig DeOxit.

Thanks, I'll give it a try

Robisme said:
What model turntable? You mention it has a preamp. When you connected it to the phono inputs, did you use the preamp?

Rob

The turntable is an AT LP50 (not vintage). I turned the turntable's preamp off when connected to the phono jacks on the receiver... I got nice clear sound for a few seconds at a time when jiggling the dials.

EchoWars · Mar 25, 2014

HeyJB said:
I got nice clear sound for a few seconds at a time when jiggling the dials.

There's your clue that the switches are the issue.

HeyJB · Mar 26, 2014

EchoWars said:
There's your clue that the switches are the issue.

The only reason I thought otherwise is that there are no issues when using the aux ports or AM/FM. Either way, a dioxin survival kit is on the way

HeyJB · Mar 28, 2014

Wouldn't ya know it, dexoit did the trick! Thanks for the info.

Now to find a nice vintage TT...

KR 6400 bad preamp?

HeyJB

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Robisme

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HeyJB

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EchoWars

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HeyJB

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HeyJB

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