Westinghouse H-223 restoration

[bandersen]

A customer dropped off this lovely Westy H-223 with original stand for restoration.

It's a crying shame someone cut a hole in the back because otherwise it is pristine. Looks like they used a saw. Why I can't imagine.

Here's a video on the initial checkout: https://youtu.be/VagQF4KD8tM









It has a rather unusual interlock that fits into the top of the chassis.




CRT tests good

[bandersen]

Here's a look at the chassis.


This thing is a real trip underneath. It does not use a flyback! The horizontal yoke windings are driven directly by a pair of 7A5 tubes.




The 7A5s are in the bottom left above that strange looking transformer.


The HV is generated by an RF supply similar to electrostatic sets.

[Chris K]

Is that a 10BP4? How does the CRT test?

[bandersen]

Yes, it tests good.

[dieseljeep]

Originally Posted by bandersen

Yes, it tests good.

I got one of those chassis from a fellow electrician. They were cleaning out the old family home, when it was sold. IIRC, the CRT was bad and the cabinet was missing. It did come was a four tube amplifier, that was original. I looked it over , pulled the tubes and dumped the rest! I kept the small amp, :
At the time, I looked like a strange design, HV osc, horiz deflection!

[Pio1980]

I think I recall this set being desirable for the ability to change the scanning rates without affecting EHT crt voltage. Only one of two postwar magnetic deflection sets I recall that did not use flyback EHT, the other had a prewar brute force AC transformer source and one of the first post-war US production sets, don't recall make model.
Germany had at least one flyback EHT set ca 1939, the E-1 as a "peoples" television receiver.
https://www.earlytelevision.org/Etzold/e1-e.html

[Electronic M]

It would be interesting trying to get it to scan 720P or 1080i.

[bandersen]

and so it begins...

Just by chance I was recently given a pile of Sams photofacts that included this set

I wonder if Philco was involved with this chassis design since it has their typical rubber corner shock mounts. Also has a couple loctal tubes.


Very solid construction. Handy that they stamped all the control functions into the chassis.


The 10BP4 and almost all the tubes are Westinghouse branded




Time for a slow, controlled power up.
After about an hour, I got up to 110 volts and was treated with this on the screen.
Very strange to have high voltage with no horizontal deflection. A side effect of the odd design.


Probably also why there are some spots burned into the screen.

[bandersen]

All three 12AU7s were nearly dead. Replacing them rested in a raster of sorts.


Adjusting the width freaked the set out a bit.


A few more weak IF tubes replaced and control tweaking got me this. There is some faint sound and a faint image.
Off to a great start
\

[nasadowsk]

Originally Posted by Pio1980

I think I recall this set being desirable for the ability to change the scanning rates without affecting EHT crt voltage. Only one of two postwar magnetic deflection sets I recall that did not use flyback EHT, the other had a prewar brute force AC transformer source and one of the first post-war US production sets, don't recall make model.
Germany had at least one flyback EHT set ca 1939, the E-1 as a "peoples" television receiver.
https://www.earlytelevision.org/Etzold/e1-e.html

Philco’s 48-700, had a brute force supply. DuMont had a set that was magnetically deflected and had brute force supply, too. I think they had a retrofit kit for it that they sent out to owners.

I think a few Sylvanias had RF power supplies for the HV, and also, DuMont, being DuMont, had a set that derived the HV from an RF style supply that synchronized to the horizontal…

[Pio1980]

Originally Posted by nasadowsk

Philco’s 48-700, had a brute force supply. DuMont had a set that was magnetically deflected and had brute force supply, too. I think they had a retrofit kit for it that they sent out to owners.

I think a few Sylvanias had RF power supplies for the HV, and also, DuMont, being DuMont, had a set that derived the HV from an RF style supply that synchronized to the horizontal…

Thanx much for the fascinating response to my post, the Philco is a very interesting set. Like to know more of the others.
Did Philco have a subsequent 7" electrostat model (50-702) with a troublesome oscillator EHT supply? It was Jim, an old friend that mentioned it to me. I mentioned adapting a salvaged Motorola electrostat EHT oscillator coil into it, but he wanted to solve the problem with the original, which at last commo, didn't happen.
https://www.antiqueradios.com/forums...c.php?t=112520

[bandersen]

I was told Westinghosue and others didn't use a flyback to avoid paying royalties to RCA.

[bandersen]

So...many...caps... These are just some of the 0.1uF bumblebees. Still many to go.



Barely any signal is making it through the tuner, but I can feed a signal into the IF just fine.

[dieseljeep]

Originally Posted by bandersen

I was told Westinghosue and others didn't use a flyback to avoid paying royalties to RCA.

They was some input in the design from Philco. In Riders, there is one model badged Westinghouse, that is identical to the Philco 48-1001.

[Pio1980]

Originally Posted by bandersen

I was told Westinghosue and others didn't use a flyback to avoid paying royalties to RCA.

How could RCA claim a patent on prior art, their superheterodyne downconversion claim notwithstanding?