I bought this at an auction about a month ago. In the pre auction pictures you could see the front magnifier assembly but somehow it got lost when it was auctioned. It was a large estate sale and I looked but could not find it.
Knobs are also missing along with the speaker. Just not sure how to replace the front assembly. The entire set looks like a lot of work. And the CRT has a burn mark on the inside.
Bob

That's gotta be a rare set.

It's electrostatic deflection so no flyback, and I also don't see an RF osc HV circuit so it probably uses a several KV 60Hz AC winding on the power transformer....Those are as deadly as the transformers in microwave ovens (very deadly). I would avoid working on the chassis while powered or exercise extreme caution.

It has a 4000 VAC winding in series with normal B+ for the high voltage.
And maybe an oil filled filter cap? Not sure about that. But its 1 UF so it would have a little kick.

A "llittle" kick? :eek:

Looking at it again it says .1 uf and .05 uf. 60 hz filter requires more capacitance than in a flyback circuit.

In other words, it will knock you into the next world, at least, if you let it!

Sent from my VS501 using Tapatalk

That's one of the rarest 7" early post-war TV's. Easily as rare as many pre-war models. The thing that would scare me is the missing front lens panel. The only thing you can hope for is to get dimensions from some other collector that has one and search for a vintage magnifier that resembles the original. A big task. My two 7" electrostatic Philco TV's have slight ion burns in the center of their CRT's. When you're watching something it isn't too obtrusive. Good luck restoring it. It would be worth the effort.

Amazing find! Good luck with the missing bits. The burn mark inside the neck shown in your photo looks like the getter flash.

Be really interesting to see the schematic of the HV area. Trying to decipher from the photos is not overly productive. Just wunnerin' if maybe it follows oscilloscope practice with the CRT anode grounded and negative HV to the cathode.:saywhat:

In that case, the average plate potential of the deflection plates would also be near ground and those 4 huge HV caps in the deflection circuit would not be needed, i’m guessing. :scratch2:

jr

Good point.

Early TV has the SAM's for it. It does have the 4 big HV caps.

I restored this one over 20 years ago, was the first and only killer HV that I have done. Wish my magnifier was in better condition, weeps the mineral oil along the edges.

A picture of my Temple in my storage area. I haven't been over to the storage area in awhile but could go over and bring the mask home to measure some time in the near future. I am in the process of 3D printing a 5 inch mask for my TT5 but my 3D printer has a max of 7.6X7.6 in.

Well I'll be durned. There is a Sams for it. HV supply is pretty straightforward.
http://earlytelevision.org/pdf/temple_tv1776_sams_66-16.pdf

Looks like they used the Motorola Horz sweep circuit, or maybe it wasn't Motorola's?

I finally made it over to my storage unit and took some pictures of my Temple's mask. There is an inner mask for the CRT and an outer mask to hold the bubble. That's a 12 inch ruler with about 1/8 inch extra space on each side of the ruler.

I finally made it over to my storage unit and took some pictures of my Temple's mask. There is an inner mask for the CRT and an outer mask to hold the bubble. That's a 12 inch ruler with about 1/8 inch extra space on each side of the ruler.
That is so unique. I could easily see finding an old magnifier that could be modified for it. The frame and brackets should be fairly easy to replicate. For a set as rare as that, it's worth all the effort.