.......And I might be getting ahead of myself. I'm getting a "pop" mostly thru the left channel when switched off, barely hear it on the right side. If it's at a higher volume, yes, the pop is louder but barely so. Anyway, I'll be using a DMM to measure at the speaker connects if I understand correctly. I'm new to this so please jump in and (hold me back), no, advice is certainly welcomed! I suspect some problems because only lately I've had the unit cut out (4-5 seconds max.) and come back on. Protection? seems to happen shortly after power up a few times sometimes only for a few seconds. Last night and today no problem at all. This is at minimum/low volume, maybe 8 or 9 o'clock, doesn't seem to matter. Unit powers up fine and can hear the click/ping. Can's seem to hear anything when it cuts out, just goes dead.
So, what am I in for? I'm willing to dive in but not without some guidance due to the "knowledge deficit" when it comes to this stuff. I have the dmm and the equipment to make repairs and have recapped (with transistors) a few phono boards successfully with AK members' help. So, any help is appreciated....prevent a newbe from running amuck!!

1st tip is always turn the volume to absolute minimum before turning any unit on or off.
Make that a rule to follow.
If you want to check dc offset which is a good place to start, go to vintage forum and click on the first post by Echowars.
It will be your start.
Download the service manual from the database and search for 950 in this forum and you will find many posts with tons of info on procedures and parts etc.
Then if you have questions about what you are trying to digest make a new post.

Just trying to give a little guidance one step at a time.

Wrap the positive probe of your DMM in heatshrink except for just the tip. This will prevent "slips" and more troubleshooting. As stated before, get the service manual and familiarize yourself with the procedure before starting. When setting the bias, volume control down to minimum and no input to the receiver. I always set it to the "AUX" position with nothing connected. Also make sure there are no speakers connected. Hope this gets you started. Good luck!!:thmbsp:

Thanks, a good start. A one-step-at-a-time is a good approach for me. I'll be doing this in fits and starts due to time constraints. I have read EW's thread on this but it's been a little while so I'll have to carefully go back. That's the first thing. You might sense my hesitancy to jump in this but to be honest I'm tired of lugging this equipment around or sending it off for repair. I think that's the motivator. I'll see where I get and report back -- thanks for the tips, Dan

Thanks, a good start. A one-step-at-a-time is a good approach for me. I'll be doing this in fits and starts due to time constraints. I have read EW's thread on this but it's been a little while so I'll have to carefully go back. That's the first thing. You might sense my hesitancy to jump in this but to be honest I'm tired of lugging this equipment around or sending it off for repair. I think that's the motivator. I'll see where I get and report back -- thanks for the tips, Dan

That is no easy unit to lug around. Must have a strong back for sure.
You'll get satisfaction from improving the performance yourself.
I learned a lot with Mark and EW's help putting my 950 back together.

It's worth the effort.
Keep us posted.:thmbsp:

Amen to that. Will keep you posted --ditto, it was Markthefixer who got me going on the phono sections I rebuilt -- and was successful!

Sounds to me like you may have some suspect transisitors on the protection board or in the pre-amp/power amp board. I would check the DC offset on the left channel also.

Try removing the jumper links for the pre-out/amp in on the rear and see if the left channel still pops or plays up, at least you can rule the pre-amp section out by removing it from the chain.

I have had this problem before on a SX1050 as the transistors had gone noisy on the tone board and allowing DC to trickle through and making one channel pop and causing the protection to activate.

Just a thought?

Cheers :)
Glen

Sounds to me like you may have some suspect transisitors on the protection board or in the pre-amp/power amp board. I would check the DC offset on the left channel also.

Try removing the jumper links for the pre-out/amp in on the rear and see if the left channel still pops or plays up, at least you can rule the pre-amp section out by removing it from the chain.

I have had this problem before on a SX1050 as the transistors had gone noisy on the tone board and allowing DC to trickle through and making one channel pop and causing the protection to activate.

Just a thought?

Cheers :)
Glen

Yes, good advice, pull the pre-power jumpers and see if it still does it, and also do a left / right swap there with interconnect cables.

After that prepare to start taking voltage measurements on the power supply.

Also either way (normal or l/r swap) see if cutting in and out the tone circuits or the filters on and off affect it.

Hey, thank you guys. Will try removing the jumpers to r/out the pre-amp. Will also get a baseline measurement dc offset.....I'll be back!