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  #46  
Old 07-07-2015, 02:15 PM
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63bird 63bird is offline
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Here's some pics of the schematic and list of tubes. I'm not sure these will show on here but here goes nothing.
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  #47  
Old 07-07-2015, 02:16 PM
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Well I guess the list is readable at least.
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  #48  
Old 07-08-2015, 11:52 AM
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the caps used in zenith sets are pretty good, esp the film caps.

the ones that give the most trouble are the single black low value electros, like 5-10uf. Not sure if your set has those, I see them in later rectangle sets.

You can change the cans if want but I generally check them, and if they test good I leave them be.

Most of the time there is a problem with dirty tube sockets, sometimes cold solder joints on video amp tubes, and maybe those .1 and .15 1kv films (again not sure as I cant test them).

Best thing to do with a zenith is to use it. That seems to keep them happy.
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  #49  
Old 07-08-2015, 12:16 PM
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Apologies in advance...

Butthead: Hey Beavis, can you reach around and turn up the BUZZ control on the back of this really big TV?

Beavis: Like....there's also this one that says "color killer"...what will that do?

Butthead: Leave that alone Beavis, it could transport us back to the old days of black and white!

.
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Last edited by DavGoodlin; 07-08-2015 at 12:21 PM.
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  #50  
Old 07-08-2015, 02:22 PM
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If you see any white tubular caps or black tubular ones (usually striped like resistors) I'd suggest changing them. Orange drops, and other lookalikes tend to be good and should be changed only if after other work and checks the circuit they are in is misbehaving.
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  #51  
Old 07-08-2015, 04:41 PM
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What do you use to check or test the caps?

I have a pair of smart tweezers it tells me the capacitance. But does not test them.

I have a old Sprague tel ohmike tester but no clue if its useful or works.
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  #52  
Old 07-08-2015, 08:26 PM
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that tel ohm is the best! It may need caps itself but once working very nice.

The thing you need to test is leakage at rated voltage. Most old testers have an eye tube, IIRC the tel ohm uses a meter to show uA leakage.

They also test value (capacity). You have to be careful on low volt electros, as the test voltage may damage them, but for most vintage stuff its should be your go to tool.

I generally test the old cans and then compare to a new cap. If they test nearly the same, I assume the old is good to go and just hook it back up. Thats the one thing you need to do is remove it from the circuit, unlike modern ESR meters.

Post up a pic of the cap tester so I can see exactly what you have.
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  #53  
Old 07-08-2015, 09:58 PM
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It's a TO-5 I'll take a pic soon
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  #54  
Old 07-08-2015, 10:46 PM
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Here's the cap tester and some other stuff I have.
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File Type: jpg IMG_20150708_213658249.jpg (70.1 KB, 18 views)
File Type: jpg IMG_20150708_213813452.jpg (74.2 KB, 13 views)
File Type: jpg IMG_20150708_213819926.jpg (51.9 KB, 15 views)
File Type: jpg IMG_20150708_213825252.jpg (83.1 KB, 15 views)
File Type: jpg IMG_20150708_213859878.jpg (84.4 KB, 16 views)
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  #55  
Old 07-08-2015, 10:49 PM
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And more random testers I have. Let me know what's junk or good. Either way they make for a nice display.
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File Type: jpg IMG_20150708_213926756.jpg (64.8 KB, 14 views)
File Type: jpg IMG_20150708_213953508.jpg (49.9 KB, 14 views)
File Type: jpg IMG_20150708_214023087.jpg (51.4 KB, 13 views)
File Type: jpg IMG_20150708_214046542.jpg (37.9 KB, 12 views)
File Type: jpg IMG_20150708_214153497.jpg (80.1 KB, 14 views)
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  #56  
Old 07-08-2015, 11:27 PM
DaveWM DaveWM is offline
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the cap tester is TOTL, should be serviced and used.
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  #57  
Old 07-08-2015, 11:40 PM
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Thanks Dave! I found a manual online for it. It don't seem too complicated to go through and calibrate.
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  #58  
Old 07-09-2015, 01:59 PM
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if you decide you don't need it, clean up the tel ohm and get it working, list it on ebay, those bring in $$$. Go look at some completed sold listings.
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  #59  
Old 07-09-2015, 03:21 PM
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Wow one sold for 200 bucks and as is condition. It's gotta be good to have if people pay that much. I got it years ago as a lot sale at a flea market for like 30 bucks. Hopefully it works still.
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  #60  
Old 07-09-2015, 07:30 PM
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All eye type cap checkers I know of are old enough to need a recap to work PROPERLY....The good part is most have fewer caps than an AA4 radio so the recap is a breeze to do (less than a half hour going at a good pace).
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