Scored a KR-6050, but having problems.

[fogmoose]

Found a dirty but otherwise good condition KR-6050 today at a moving sale. De-oxy'd all the pots and switches, but still getting serious spikes and static in both channels. It actually seemed to get worse after I cleaned the Pots! It is so bad that it was tripping the protection, so I don't even want to turn it on till I get some advice on the problem. Good thing I didn't hook up speakers to it!

This is my first Kenwood, and it is in great shape otherwise so I would love to get it going. I seem to remember that the On/Speaker/A/B Switch on this era of kenwoods was a common problem. Am I getting warm? I am far from an expert, but I can swing a soldering iron so any info would be appreciated. If I can't get it running, at least it will be good for parts for someone, I suppose.

Looking forward to hearing from the Kenwood section!

 

[pamook]

Fogmoose, any info on this issue? :scratch2:

I just got a 6050 that has static and spikes problem (not driving it into protect though), distorted bass and God forbid to switch loudness to ON

Also did the cleaning of relay contacts, switches and pots, no luck, still heavy spikes when volume turned over "3"...

Any new info much appreciated :yes::yes:

Thx :thmbsp:

 

[PacificStereo]

Power supply trouble, defective input differential transistors (or other bad silicon), leaky cap(s) putting DC where it doesn't belong, defective solder...

Any or all.

 

[pamook]

Thank you PacificStereo :thmbsp: , I brought it to a local guy who knew what to look for and it happened to be a small power supply trouble (dunno what, he changed some resistors as far as I can see on the board) and rest was lots of solder points gone bad, he said there was lots of them so he re-soldered the whole preamp and psu board

Now it works fine but a re-cap will be in order cos 30yrs didnt do any good to those capacitors, right now it sounds a bit hollow or thin or...

Im looking forward to get it play some music again :yes::yes: