CA1000 woes

[rjsilva]

I had posted another thread after getting back to my CA1000 (the input selector issue). But it has another major issue that I’m unsure about.

All I can describe is the sound. It has a narrow soundstage, sounds like it’s coming directly and only from the speakers. I tested the speakers with a basic Yamaha CRX330 and it sounded 10X better. And the CA1000’s left channel has some notable hiss/noise. I was using Tape A and B inputs since the input selector isn’t working right.

I had done a lot of work on it years ago. It had a total recap (quality caps, included the recommend power supply caps by avionic), relay replacement, transistor replacements, etc. For years it sounded awesome with my Klipsch RB75s.

What are areas I need to look at?

 

[mbz]

Check power supply voltages, +/-B and +/-50 wires on power amp boards.
Both channels affected? If scope is available then run some square wave tests.
Maybe the fusible on the tone board has drifted.
Worthwhile to continuity check the input selector due to past history, one probe in RCA other probe at solder blobs on front (5P?) connector of function board.

 

[avionic]

I had done a lot of work on it years ago. It had a total recap (quality caps, included the recommend power supply caps by avionic), relay replacement, transistor replacements, etc. For years it sounded awesome with my Klipsch RB75s.

Have you properly cleaned the function selector switch?

 

[rjsilva]

Have you properly cleaned the function selector switch?

When I initially noticed the switching issue I used some deoxit on it (didn’t make a difference). I can’t say when the reduced sound quality appeared. Could have been at the same time. It’s been a couple of years since I’ve really used it unfortunately. I loved the amp.

 

[avionic]

I used some deoxit on it (didn’t make a difference).

That slide switch needs to be disassembled.