Silvertone 9186A diagnosis and repair

[MuzzcoVW]

After being away from the hobby for decades I acquired a beautiful 1959 Silvertone Medalist with the 24 inch CRT. This unit has super low hours and the story is that the unit hasn't been used since the early 60s. The current situation is this. After replacing a corroded sand resistor at the beginning of the tube string and performing a soft start I have this... can't quite bring the horizontal in before the screen starts bugging out. I'll be running through performing some voltage tests while I wait for an order of capacitors to arrive but I was hoping to get at least something for a baseline, but maybe this is as good as I can get for now.

[MuzzcoVW]

Having trouble posting pictures, i hope this works

[Chris K]

Originally Posted by MuzzcoVW

After being away from the hobby for decades I acquired a beautiful 1959 Silvertone Medalist with the 24 inch CRT. This unit has super low hours and the story is that the unit hasn't been used since the early 60s. The current situation is this. After replacing a corroded sand resistor at the beginning of the tube string and performing a soft start I have this... can't quite bring the horizontal in before the screen starts bugging out. I'll be running through performing some voltage tests while I wait for an order of capacitors to arrive but I was hoping to get at least something for a baseline, but maybe this is as good as I can get for now.

That's a pretty darn good start! So the electrolytic caps responded well to reforming? I am a stumbling, bumbling noob at this stuff and there are many experts here who will give you advice you should follow but I wouldn't start problem solving issues like horizontal lock and the like until you're reasonably certain enough components are working as they should. But like I said, take a noob's advice at your own risk!

[MuzzcoVW]

They did, so far as I can tell. Nothing is overly hot however I don't know that something isn't open or way off value. I plan on re capping the entire set but I always like to see my starting point. As far as being a noob... well I may as well be myself. I haven't been inside a set since 1988 and even then as a teenager I had only a very basic knowledge of testing and diagnostics. The only tool I still have is my old CRT tester

[Yamamaya42]

Does it have a selenium horizontal phase detector? Those are always the first suspect for horizontal stability problems, shaking and rolling horizontally.
Looks like a 24ALP4, I have a tired 24AHP4 on my maggot box!

[MuzzcoVW]

Originally Posted by Yamamaya42

Does it have a selenium horizontal phase detector? Those are always the first suspect for horizontal stability problems, shaking and rolling horizontally.
Looks like a 24ALP4, I have a tired 24AHP4 on my maggot box!

It has a 24AEP4 that tests like new. I'll check on the selenium, I haven't really dug deep yet into the schematic

[Electronic M]

With it like that I'd recap the horizontal osc and output stages first and address the H AFC selenium pack mentioned, try to get synced picture then do the general recap 2-5 caps at a time if I was a beginner. Once you've recapped several dozen TVs and aren't prone to making mistakes/inexperienced finding them, then shotgunning caps becomes a more viable approach for time saving.

[MuzzcoVW]

Originally Posted by Electronic M

With it like that I'd recap the horizontal osc and output stages first and address the H AFC selenium pack mentioned, try to get synced picture then do the general recap 2-5 caps at a time if I was a beginner. Once you've recapped several dozen TVs and aren't prone to making mistakes/inexperienced finding them, then shotgunning caps becomes a more viable approach for time saving.

Well it turns out after a little more studying, turns out I have the wrong Sam's. The set I have is similar, but there are a couple differences.. namely where my set shows Selenium Diodes the back of my chassis doesn't have them. I have a set from 7-1959 and it looks like I have a slightly later set. Problem is the Sam's site doesn't have the exact number and lists the set as a "659 Servicer". I'll have to call them tomorrow to order the correct set.

[Yamamaya42]

I was able to DL a OK copy from here

https://www.radiomuseum.org/r/sears_..._52852166.html

[MuzzcoVW]

Originally Posted by Yamamaya42

I was able to DL a OK copy from here

https://www.radiomuseum.org/r/sears_..._52852166.html

Thanks! The number isn't exact, but closer than what I have now. I'll check it out. Maybe it's a range of chassis like the current Sam's I have