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  #1  
Old 02-22-2015, 04:50 PM
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tubesrule tubesrule is offline
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TRK12 chassis' in original crates

I'm selling my TRK12 main video and power supply chassis' that are in the original shipping crates. They are in excellent condition. I am looking for $2K OBO. They weigh 63# and 47# and I would rather not ship them. I will deliver them to the ETF convention in May.

Darryl
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  #2  
Old 02-22-2015, 07:37 PM
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dtvmcdonald dtvmcdonald is offline
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Quote:
Originally Posted by tubesrule View Post
I'm selling my TRK12 main video and power supply chassis' that are in the original shipping crates. They are in excellent condition. I am looking for $2K OBO. They weigh 63# and 47# and I would rather not ship them. I will deliver them to the ETF convention in May.

Darryl
I'm very interested. What else is necessary to make a working TV?
Obviously a CRT and Yoke. Presumably unobtanium??? It uses 60Hz HV for the CRT and a simple output transformer for the horizontal.
Could, then, some later tube/yoke be fitted, somehow?

Cabinet is unimportant ... I would have one made out of Plexiglass.

I would present it as "100% original looks" for the two chassis only,
full restuff of everything ... and the undersides would be VERY visible.
But it has to work!
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  #3  
Old 02-22-2015, 09:15 PM
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tubesrule tubesrule is offline
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9AP4's and 12AP4's are extremely hard to find. Yokes for these sets are not hard to find. 12LP4/KP4 tubes have been subbed. This is the complete setup for the video portion of a TRK12 or TRK9. There was also a radio included with these sets that is not here.
It does use mains derived HV at 7000V and is therefore very dangerous. I have never powered them up so I don't know how the caps have held up. Assume the chassis need normal restoration as they are all original.
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Old 02-22-2015, 09:23 PM
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Quote:
Originally Posted by tubesrule View Post
9AP4's and 12AP4's are extremely hard to find. Yokes for these sets are not hard to find. 12LP4/KP4 tubes have been subbed. This is the complete setup for the video portion of a TRK12 or TRK9. There was also a radio included with these sets that is not here.
It does use mains derived HV at 7000V and is therefore very dangerous. I have never powered them up so I don't know how the caps have held up. Assume the chassis need normal restoration as they are all original.
I'll have to think about it. I've never done a cosmetic
restuff job, so it would be learning. Is a 12K/LP4 as long as a
12AP4? The CRT would be mounted horizontally. No mirror.

I will be at the convention.
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Old 02-22-2015, 10:20 PM
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Quote:
Originally Posted by dtvmcdonald View Post
I'll have to think about it. I've never done a cosmetic
restuff job, so it would be learning. Is a 12K/LP4 as long as a
12AP4? The CRT would be mounted horizontally. No mirror.
The 12AP4/9AP4 are longer than the 12KP4/L4. The 12AP4 was 40 degree deflection while the 12KP4 was 54 degree. These chassis' have plenty of deflection capability to drive the extra angle.
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Old 02-23-2015, 05:48 AM
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You'll need to rewire the yoke to do that, since the CRT normally fires into a mirror.
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Old 02-23-2015, 07:16 AM
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Quote:
Originally Posted by dtvmcdonald View Post
I'll have to think about it. I've never done a cosmetic
restuff job, so it would be learning. Is a 12K/LP4 as long as a
12AP4? The CRT would be mounted horizontally. No mirror.

I will be at the convention.
You have totally piqued my curiosity. When you said a cabinet made of plexi I assumed a "Phantom Teleciever" replica.

What are you up to .
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Old 02-23-2015, 08:12 AM
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Sorry to go a little off topic here, but the chassis in the original shipping container is cool enough! As someone who grew up with everything packaged in cardboard and styrofoam, you could really display this as is....I'd call it a museum piece.
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Old 02-23-2015, 10:21 AM
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Quote:
Originally Posted by dishdude View Post
Sorry to go a little off topic here, but the chassis in the original shipping container is cool enough! As someone who grew up with everything packaged in cardboard and styrofoam, you could really display this as is....I'd call it a museum piece.
I could adapt the crates as tables.
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  #10  
Old 02-23-2015, 10:55 AM
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Quote:
Originally Posted by vts1134 View Post
You have totally piqued my curiosity. When you said a cabinet made of plexi I assumed a "Phantom Teleciever" replica.

What are you up to .
Yes, but not quite as fancy a case. Mine would use the shorter
K/L tube and be a table model. No radio either.

I've always wanted a prewar set, and a set with a clear case. This is
a good chance at a good price. And I need to learn how
to restuff capacitors and make fake dogbone resistors.

My personal philosophy is to have everything work to show off
what the old sets did, using modern signals. I'm very impressed with
the picture quality of my own 9T-246 and CT-100 sets as well as
some (but not all!) of the prewar sets at the ETF. I'm not
a cabinet fetishist. I'm a circuit fetishist.

Oh, one question ... do NOS dogbone style ceramic caps still exist?
Does this chassis use them? I would never use a NOS dogbone
resistor, but the ceramics seem OK.
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  #11  
Old 02-23-2015, 11:19 AM
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Can resistors degrade with age the way capacitors do? I thought it was heat and usage that necessitated resistor replacement.
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Old 02-23-2015, 11:24 AM
dieseljeep dieseljeep is offline
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Quote:
Originally Posted by tubesrule View Post
9AP4's and 12AP4's are extremely hard to find. Yokes for these sets are not hard to find. 12LP4/KP4 tubes have been subbed. This is the complete setup for the video portion of a TRK12 or TRK9. There was also a radio included with these sets that is not here.
It does use mains derived HV at 7000V and is therefore very dangerous. I have never powered them up so I don't know how the caps have held up. Assume the chassis need normal restoration as they are all original.
Looking at the under chassis view, I see it uses those ratty brown capacitors. Did RCA make them themselves? I never saw any brand name on them, only the value. I don't even remember how the outside foil was marked.
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  #13  
Old 02-23-2015, 01:27 PM
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The resistors in the chassis' are mostly likely in fine shape. Ceramic and mica caps will probably be as well. The RCA brown paper caps will most likely need to be rebuilt. This style is the easiest out of all the different types to rebuild. The ends are simple rolled and the insides are easily pushed out, a new cap inserted, the end cap put back on and the cardboard rolled over again.

Darryl
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Old 02-23-2015, 05:16 PM
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Truly, the right thing to do here is to make a cabinet out of the shipping crate.
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  #15  
Old 02-23-2015, 05:23 PM
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Quote:
Originally Posted by dieseljeep View Post
Looking at the under chassis view, I see it uses those ratty brown capacitors. Did RCA make them themselves? I never saw any brand name on them, only the value. I don't even remember how the outside foil was marked.
Most likely. RCA did make rather lousy capacitors for years, until one of the chassis in Sarnoff's custom home sound system failed as a result of one of those capacitors going bad...I read a more humorously worded version of that story in ARC a few years before they went to hell.
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