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Old 02-27-2018, 09:09 PM
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Adam Adam is offline
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1970 Zenith 21" color with the SC600 remote

14A9C50 chassis (one of the early hybrids with no modules) in the metal cabinet…

When I got this set (at the fall etf) I was told it had no HV. But I plugged it in today, and the HV is fine. Although there are several problems with it, which are as follows:

1. color oscillator - It has those color bars rolling up and down the screen

2. no sound - and, yes, I already tried flipping the auto/manual switch to manual

3. power tuning doesn't work

4. none of the remote stuff works at all

5. cosmetic stuff: missing a few knobs (which I might have), The back and bottom of the cabinet is rusty, the inside of the cabinet is rusty, chassis is a little rusty. But nothing so bad that it actually has eaten away any metal, and the outside fake woodgrain part of the cabinet looks good, and strangely, the antenna is actually unbroken. If this wasn't a rare remote set I wouldn't bother, but I suspect I'll probably wind up repainting the back, bottom and inside of the cabinet.

I'll post some pics later...
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Old 02-28-2018, 09:36 AM
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Marco-nix Marco-nix is offline
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First of all, you need to de-rust all grounds and clean all around the chassis ..
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Old 06-19-2018, 06:15 PM
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Adam Adam is offline
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So I've fixed the sound, the color (except for a broken blue convergence pot - I have a spare convergence board for this, but the same pot is bad on that one too!), and the remote issues that were electronic (not yet the ones that are mechanical, which are many).

But it's developed an HV regulation problem I have not been able to sort out. At first the picture was blooming out, then going black, when the brightness went up. After changing the HV rectifier, it stopped doing that, but the HV still drops as much as 5KV with variations in brightness and the picture pulls in on the left side. I've been working on this set on and off for months, yet have not been able to find a single defective component that could be causing this beyond that one tube.
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Old 06-20-2018, 07:52 AM
zeno zeno is offline
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Location: New Hampshire
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For the HV 1st be sure the damper & reg tube match the
tube chart, do not sub. Sometimes they show 2 different
pairs you can use. But most likely its the VDR. Trouble is
even the NOS ones are going bad in the package. Doug,
DRH4683 did great work finding a modern sub. Find
that thread ! Also watch out for high ohm resistors in
the reg area.

IIRC it was the left blue horz control & went bad in all of them.
Came as a kit with a power resistor. I dont remember the
details but probably subbed from a 63- number to an 800- number.
There are a few lists out there of NOS parts FS out there & you
may find one.

For remote the only things I remember was the rocker SW on the
rear of the TNR.

73 Zeno
LFOD !
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  #5  
Old 06-20-2018, 06:40 PM
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Jon A. Jon A. is offline
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I saved the VDR replacement info to a text file a while ago.

Quote:
The best performing modern MOV varistor was made by KOA Speer, type NVD14UCD430
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