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Kenwood KR-6600 Phono Issue

S

Starquest

Super Member
I recently got a basket-case KR-6600 for free. It was filthy like you wouldn't believe -- let's just say a rodent or two did their business more than once.

Anyway! After hours of cleanup, I connected it to some gear, and it kinda works. The main issue is that there is left-channel weirdness on the phono inputs. There is a low frequency pumping on speakers and headphones (left channel only). It's bad enough that I thought it would damage the woofer on my speakers. Additionally, with my iPhone on aux, when I switch to phono, I can hear the aux source in the left channel. Not loud, but it's there.

I did liberally clean the contacts on this amp, but some of the selectors use this rod that connects to a switch at the back of the unit. I sprayed some cleaner back there, but have no idea if they got hit. There is no static or noise when switching sources.

Is this a bad phono stage?
 
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Usual suspects are dry solder joints and caps. Check solder joints with magnifying lamp or...
It's a vintage piece, will need a little work. Will try and dig up sm.
 
As a punt, you could try replacing audio path caps Cd1 (3.3uf/25V) and Cd11 (10uf/25V) both with Nichicon UKL
or wima MKS if you prefer. Phono stage uses an IC (opamp?), I'd be tempted to replace Cd13 (47uf/25V) on the
power rail with SilmicII, Nichi KZ or... however failure here would affect both channels.

Suppose you don't have a scope or Audio probe?
 
mbz said:
As a punt, you could try replacing audio path caps Cd1 (3.3uf/25V) and Cd11 (10uf/25V) both with Nichicon UKL
or wima MKS if you prefer. Phono stage uses an IC (opamp?), I'd be tempted to replace Cd13 (47uf/25V) on the
power rail with SilmicII, Nichi KZ or... however failure here would affect both channels.

Suppose you don't have a scope or Audio probe?
Click to expand...

I don't have either. At first when I noticed the noise and woofer excursion, I figured it was a bad phono board. But hearing the aux in the left channel is a spanner in the works. I have the service manual and will look more in depth at it.
 
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