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 Post subject: Re: Zenith H2447R 19" Porthole TV
PostPosted: Dec Thu 07, 2017 5:30 pm 
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Joined: Jan Sun 18, 2015 5:01 am
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Location: Waxahachie Texas
And the chassis labels are done.


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 Post subject: Re: Zenith H2447R 19" Porthole TV
PostPosted: Dec Sat 09, 2017 1:02 am 
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Joined: Jan Sun 18, 2015 5:01 am
Posts: 920
Location: Waxahachie Texas
There was a discussion of the E-Caps getting hotter when enclosed in my method using PVC sleeves on the other forum. Now that the chassis is up and running I made some temperature checks.

I checked the temps today using my HF infrared thermometer. I took a measurement when I started, then 2 hours later. Here are the results:

E-Cap - Start - 2 Hours later with Can - 2 Hours later without the can
C1 - 22C - 46.1C - 49.3C
C2 - 22C - 63.1C - 43.9C
C3 - 23C - 45.7C - 40.4C
C4 - 22C - 38.0C - 32.9C

C2 is located on the power supply chassis next to V11 6BF5 audio output tube. This tube glows brightly under normal operation and gets very hot. IIRC it measured @268 F.

It looks like the can and sleeve actually acts as a barrier to the surrounding heat of the chassis as shown by about a 3 to 5 degree difference between the can being on or off. The exception is C2 due to being close to the 6BF5.

This test wasn't very scientific but does demonstrate that enclosing them in the PVC and their cans actually proves to reduce the heat of the E-Caps. In any case, all of these E-Caps are 105C and are no where near their rated temperature.

I did a life span estimate from the Nichicon website of C2 22uf 500V E-Caps at 45C, and their life span was 131,400 hours. That's about 45 years at 8 hours a day, every day!

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 Post subject: Re: Zenith H2447R 19" Porthole TV
PostPosted: Dec Sat 09, 2017 3:00 am 
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Joined: Jan Sun 18, 2015 5:01 am
Posts: 920
Location: Waxahachie Texas
Crist Rigotti wrote:
A very generous member of this another forum gave me a B&K 415 and a 1077B along with most of the cables. I wanted to use the 415 to align this set and after making up the missing cable and converting the mic connectors to BNC, I found out that the 415 doesn't work on the "sweep" function. So over the next week I'll dive into that to see if I can get it going. I'll make a post in the Test Equipment section when that happens.


I started a repair thread in the test equipment section here:

http://www.antiqueradios.com/forums/vie ... 8#p2781048

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 Post subject: Re: Zenith H2447R 19" Porthole TV
PostPosted: Dec Sun 10, 2017 4:06 am 
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Joined: Jan Sun 18, 2015 5:01 am
Posts: 920
Location: Waxahachie Texas
I decided to start work on the cabinet today. I removed the bezel and started to clean it up. I noticed that the "brass" area around the On-Off-Volume knob was quite well worn. It even has the thin plating worn off.

When cleaning the door the plating rubbed off with very little rubbing. And I mean very little. I then took all of the "plating" off. I thought Philco was the only one that skimped on the thickness of the plating. It looks like the aluminum door is bright nickel plated? Probably needs to be that way before it was brass plated. I guess I'll have to find a plating company to plate the door and the knob pieces. As a matter of fact, the bezel brass plating is gone along the most outer edge from repeated cleaning through the decades. I'll get an estimate on getting it all re-plated bright brass. Might even take my Predicta parts along too.


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