I have just finished restoring my 3rd 800c. All new caps, SDS board, adjustable bias etc. I now noticed that the input selector rotary switch is very hard to turn. It has been cleaned and lubed, and I also added a little grease to the small ball that provides the stops at each selection. Still is hard to turn.
On my 800c, I can easily rotate this knob with thumb and index finger. On this 800c (a friends) I have to grab it with finger wrapped around it to get it to move. I feel like I am going to break the knob off!
It looks to me like the washer that holds the small ball in place is thicker than on others. As you rotate the knob, this washer flexes to allow the ball to move to the next position. This is an early 800c as it has a RCA jack for center channel out that others I have worked on do not have.
Has anyone encountered this or have a possible solution? I don't want to remove the whole switch assembly, but I may have to. I might see if I have a slightly smaller ball that I can use to make it easier to turn. John

John: Sounds like the shaft is binding in the sleeve, possibly bent slightly. You have to take it apart to check for trueness. Could also be binding in the sleeve due to corrosion. You could also thin the washer on a belt sander but I'd do that as a last resort.

Good point. I did add a drop of oil in the sleeve, but a bent shaft is a possibility. I will try to remove the assembly without de-soldering the wires and see what I can discover.

Sounds like the shaft is binding in the sleeve, possibly bent slightly.

Could be.

You may also be able to loosen up the nut a bit that holds it to the faceplate. (less tension from the HD washer on it)

Or, perhaps the model 800C you have there, is one of the specially made model that came with the CPIS option (Child-Proof Input Selector) switch. It kept little Molly and Mikey from flipping the rotary switch around while their parents were listening to whatever THEY had selected. It was also known as the DPMO option for the parents. (Don't Piss Me Off) switch. :D

. . Falcon

Ah... a simple thing to try. I like that! I will see if loosening the nut will do anything. Thanks, John