Classic Hifi Care

That was me that said "what is next" so I guess I started the trip down off topic lane. Sorry.

I believe you mentioned that you are, or were going to work on the 78 changer. That Olympic should sound great playing 78's. I have a few friends that do nothing but listen to 78's and do not even consider 45's and LP's worth listening too. Of course, they think the last really good music was recorded in the 78 era. That is a nice looking unit, and if selling it is down the road having a working 78 changer and adding Bluetooth might help with the sale.

Bill

Great job on the Motorola restoration. Enjoyed following along.

@stbasil This was great restore thread to look through for me. Way, cool, well done. All of these projects on here are amazing and interesting in their own independent ways. I'm just dipping my toe in the water and am VERY impressed with the can do attitude and knowledge and projects this group has. Bravo all around!

Matt, dipping your toe is pretty much where we all started at some point in our lives. Some, started young, others like me started in my retirement years which makes it a little harder to get the learning curve down. I was speaking totally about myself for the learning curve thing. As I have mentioned before, if I can do it anyone can. Keep reading and enjoying everything that has been posted, there is a lot of information that really does help as we enjoy this hobby.

Bill

Shortly after moving the SK111 to our living room and my tweaking of the coils on the MPX unit, the stereo light quit working. Still had FM sound, but it was mono, no audible separation. Didn't want to mess with it since I don't use FM that much.

But, we relocated it in our living room for a better sounding location, and after that, the radio became very weak, both FM and AM. Finally got around to checking that out this morning. I took off the back and started wiggling some of the interconnecting cables and connectors, but no effect. Then I noticed that the MPX tubes were cold, no filaments glowing, even though the MPX was putting out audio!

I'm guessing the filament voltage was not getting to the MPX unit, but the input transistor was still getting its DC, so the mono audio had a path to the center tap of the final transformer, and subsequently to the outputs. This schematic, (one of three different ones) most clearly shows that path in the upper horizontal line. So, I de-oxed all the Amperex connectors for the MPX power cable that goes to the tuner and the one from the power amp to the tuner. Now, the stereo light works (its not very selective, stays on or flashing most of the time while tuning) and stations actually have decent stereo separation! BTW, that output transistor stage, V4, is not actually present on my MPX.

For those of you who have the "wonky stereo light" you might try this fix. Will it last? We shall see.....