Vintage Hoffman

[charokeeroad]

I would appreciate any feedback on this Early 50s Hoffman. The channel selector is of particular interest it has many of the channels showing the station id. like KRON channel 4 and KTLA channel 5. Is the tube a 12UP4? How about the year, 1951-1952? I there a chassis number?

Thanks

[Eric H]

Originally Posted by charokeeroad

I would appreciate any feedback on this Early 50s Hoffman. The channel selector is of particular interest it has many of the channels showing the station id. like KRON channel 4 and KTLA channel 5. Is the tube a 12UP4? How about the year, 1951-1952? I there a chassis number?

Thanks

I suspect the CRT is an early rectangular model, maybe a 14 or 16"? Possibly/probably metal? it looks like it has an insulator around the front.

The 12UP4 is a round 12" metal tube, used in Zenith Portholes only afaik.

My Hoffmans have the channel tabs with the stations also, mine are from Los Angeles.

I don't know what the chassis is like on this one, probably similar.
They are really nice sets in my opinion.

[jr_tech]

The early rectangular CRTs (14", 16" and 20" ) were not made in metal... but indeed, it appears that perhaps this set has an insulator around the CRT opening in the bezel. Perhaps a 16" metal round tube lurks behind the bezel? Nice set!
jr

[charokeeroad]

Originally Posted by jr_tech

The early rectangular CRTs (14", 16" and 20" ) were not made in metal... but indeed, it appears that perhaps this set has an insulator around the CRT opening in the bezel. Perhaps a 16" metal round tube lurks behind the bezel? Nice set!
jr

That's what I think too. it a big roundie behind the bezel... (that woud be nice) but an early rectangular would be a treat too especially if it's strong.

[charokeeroad]

Originally Posted by Eric H

I suspect the CRT is an early rectangular model, maybe a 14 or 16"? Possibly/probably metal? it looks like it has an insulator around the front.

The 12UP4 is a round 12" metal tube, used in Zenith Portholes only afaik.

My Hoffmans have the channel tabs with the stations also, mine are from Los Angeles.

I don't know what the chassis is like on this one, probably similar.
They are really nice sets in my opinion.

This is exciting. When I go to pick up this set I will be anxiously awaiting the first sight of the CRT. Is it round is it rectangular? What is the number on the CRT? Is it Good? how strong is it? How do I get it into my car and drive away without giving away my excitement to this generous giver.. After I'm away for a few blocks I'll stop and just look at it and realize it's mine.

[charokeeroad]

"The cabinet measures 37.5 inches high from the floor, it is 22 inches deep and 26 inches wide. I couldn't find a year on the back, but the model number is 877 and chassis number is 171. There is also an interesting 4 prong plug in the back that says "UHF adapter for future channels"

Notes from the giver..

[bandersen]

I found it in Riders Vol 6 and Beitman's from 1951.

They show the UHF converter plug carries Ground, 6.3 VAC (filament supply) and +265 Volts.

[charokeeroad]

Originally Posted by bandersen

I found it in Riders Vol 6 and Beitman's from 1951.

They show the UHF converter plug carries Ground, 6.3 VAC (filament supply) and +265 Volts.

Thanks for looking. Tom Albrecht found it in Sams and although Sams shows that model number with a 19AP4 it also mentions that there are some variations on that model. It doesn't look like a 19" but I guess it could be based on cabinet size.

[bandersen]

Beitman's lists the 171, 171, 173 and 175 chassis together because they are so similar. Here are the CRTs they use.

170 - 14CP4
171 - 16TP4
173 - 17BP4
175 - 19AP4

[charokeeroad]

I see I have my homework cut out for me. Are all these tubes roundies?

[jr_tech]

The 19AP4 is a metal roundie. The rest are glass rectangular.
jr

[Eric H]

I'm almost certain it's not a round tube, they wouldn't have masked it off like that if it was, it'd probably have a double D screen if that was the case.

[bandersen]

If Beitman's is correct, then you've got the 16" glass rectangular 16TP4. I can scan the schematic if you'd like.

[charokeeroad]

Originally Posted by bandersen

If Beitman's is correct, then you've got the 16" glass rectangular 16TP4. I can scan the schematic if you'd like.

I'm inclined to think it's a 16TP4,all glass, based on the look and the model # 171.

http://www.shinjo.info/frank/sheets/093/1/16TP4.pdf

I'm hoping the CRT comes out with the chassis and that the CRT isn't bolted to the cabinet.

I would appreciate the schematic. where will I find it?

[jr_tech]

Originally Posted by Eric H

I'm almost certain it's not a round tube, they wouldn't have masked it off like that if it was, it'd probably have a double D screen if that was the case.

Most likely... the service literature (Beltmans) indicates that it is a 16TP4, but I wonder why the cabinet is so deep?

Several Admiral models from 1949 did use a rectangular mask in front of a metal 16" roundie.
http://www.tvhistory.tv/1949_Admiral_AD3.jpg

I have an Admiral branded 16AP4 that was from a similar model.

jr