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Stereo mode in phone stage going out

I have a Pioneer SX-950 that had a near-complete restoration a few months ago.  The issue I had taken it in for was the stereo mode when playing vinyl would cut out on the right channel. Thankfully, the mono mode stayed intact.  Up until recently, all was well with stereo mode, but last week the same issue popped up again.  My question is: would purchasing a separate phono stage correct this issue?  

nicholsr

Showing 3 responses by lewm

lewm
13,458 posts
 

I tend to favor porchlight’s suggestion that the fault is in the selector switch, because OP says it doesn’t happen with other inputs. on the other hand, if the stereo/mono switch is only in the phono stage circuit, in that case it could be that stereo mono switch. But I think most of those old receivers and integrated amplifiers would have the stereo mono switch in the line stage circuit.

 

lewm
13,458 posts
 

Forgot to mention, do you have this problem when switched to any of the high level inputs?  For example, CDP or tuner?  The stereo/mono switch is typically in the linestage circuit, not in the phono stage circuit, in an integrated amp or receiver. By that reasoning, the loss of a stereo signal ought to be happening  when you are listening to any source component, if the switch is at fault. 

lewm
13,458 posts
 

Given the age of the unit, it’s probably a dirty or faulty switch. Before you buy anything, I would query the guys who restored it for you first. If it’s the switch, that is a very easy and inexpensive fix. I have one question along the lines of Elliot’s post, when you are in mono mode, do you hear signal from both speakers?

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