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  #46  
Old 01-22-2016, 08:58 AM
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Quote:
Originally Posted by zeno View Post
Back cross it in an ECG catalogue. Look at the list of Zenith
numbers that start with 221-###-# ( IIRC its 221-, maybe 212-) &
find it that way. Sorry for bad memory.......

73 Zeno
I'd like to, but I don't have a ECG catalogue.
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  #47  
Old 01-22-2016, 05:31 PM
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And IIRC you cant run a list from the digital version.
An ECG or NTE hard copy is needed. I dont think I
have one but I will scratch around tomorrow........

73 Zeno


Quote:
Originally Posted by Jon A. View Post
I'd like to, but I don't have a ECG catalogue.
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  #48  
Old 01-22-2016, 09:02 PM
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http://www.ebay.com/itm/ECG-556-Coll...cAAOxyOMdS2ZdC

just came across this on ebay-free shipping
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  #49  
Old 01-23-2016, 02:24 PM
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Quote:
Originally Posted by sampson159 View Post
http://www.ebay.com/itm/ECG-556-Coll...cAAOxyOMdS2ZdC

just came across this on ebay-free shipping
Not for me. Thanks for the heads-up though, I didn't know I could also search for ECG.
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  #50  
Old 07-24-2016, 06:47 AM
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Now I need a focus pot. Any idea what to look for in a replacement? Mine says:

37-39627-3
TRW 7919
35MEG 10%
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  #51  
Old 07-24-2016, 01:13 PM
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You need to find one with the well insulated mounting.
If you find say a 20K you can mess with resistors to get
it in range. The mounting is the key.

73 Zeno
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  #52  
Old 10-28-2016, 03:43 AM
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So I don't need one with a plastic shaft? Also, the "35 meg" indicates 350k ohms, correct? I've been looking for a suitable replacement for many hours and it's been very frustrating.
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  #53  
Old 10-28-2016, 09:02 AM
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Quote:
Originally Posted by Jon A. View Post
So I don't need one with a plastic shaft? Also, the "35 meg" indicates 350k ohms, correct? I've been looking for a suitable replacement for many hours and it's been very frustrating.
In the case of focus pots the ones that look like normal pots
are almost all plastic cause there is 6KV on them. There are
also newer styles. A pix of it would help.

When you see "meg" add 6 zeros to it so 35 meg is 35,000,000
ohms or 35 million. 350k add 3 zeros so 350,000 ohms.
35 meg sounds high maybe its 3.5 meg ??

73 Zeno
LFOD !
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  #54  
Old 10-28-2016, 03:33 PM
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I may need the schematic. I've been googling like mad trying to figure this out.

Unfortunately I tossed the original control *very* recently. However, I took photos of the nearly identical control in my Electrohome console. The biggest difference in its appearance is how it's adjusted. The Sylvania unit had a short shaft.

No value on the Electrohome's control, but the schematic says 17M5. Not sure what that means either.
Attached Images
File Type: jpg image.jpg (114.7 KB, 20 views)

Last edited by Jon A.; 10-28-2016 at 10:17 PM.
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  #55  
Old 10-28-2016, 03:36 PM
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Found two on eBay that are physically identical to the Sylvania unit.

http://www.ebay.com/itm/221372494259

http://www.ebay.com/itm/391167737957

Last edited by Jon A.; 10-28-2016 at 10:17 PM.
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  #56  
Old 10-29-2016, 12:36 PM
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meter the old one. if its 5 meg you can measure it.
If 35 meg probably not. The 35 meg would have a printed
resistor on it as part of a divider. Of course thats if its not
wide opened. You can also measure with a HV probe.
One end will have apx 7KV DC center 6KV other end
probably much less than 5KV.

73 Zeno
LFOD
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