First, I lost the schematic. It's a straight tv only. Console with half doors. Don't remember model number. Secondly, can somebody help me with a good correct replacement power transformer for it? Either new, or on a chassis??
Please help, guys. Thanks.
Bill Cahill

Uses single 5U4 rectifier tube on chassis. Power transformer is completely under chassis.

Finally, I found the Chassis number to the set. It is 21D1. I desperately need the power transformer for this set, and, schematic. The rectangular version isn't very close. Can somebody please help me?? Maybe you have a chassis with a good transformer?? Or, can someone find me a new old stock replacement?
Thank You..
Bill Cahill

Got a part # on the xfmr?

Actually, I have several part numbers. Here they are.........

Merit P 2867

Stancor P 8164

Triad R 66F35

Hope you can help. Thanks.
Bill Cahill

Play Things of the Past lists two Admiral TV power transformers - you didn't give the original number (which would help!), but the two they list are:

80B58-1 and 80C26-2

Also, what are the secondary windings? Sometimes a tranny with an additional winding will work, you just don't need/use the additional winding.
Or, one without the rectifier filament winding will do if you convert to a silicon diode.

I've got Triad, Thordarson, and Merit Transformers, but need more info to see if any of mine might even be close.

Cheers,

The part numbers I gave are exact replacements. John didn't give me the Admiral part number.
No, I don't wish to go to silicon rectifiers.

. . . . 21D1. . . . I desperately need the power transformer for this set, and, schematic.

The schematic is the last schematic in the 26 page 21D1 Rider manual:

http://www.earlytelevision.org/tv_schematic_diagrams_postwar.html

Jas.

Working backwards, both Admiral part number 80C26-1 crosses to the Merit P 2867.

Thordarson lists the original transformer number for the 21D1 as 80C26-1, and crosses it to a Thordarson 26R71. The 80C26-2 carried by Play Things of the Past also crosses to the 26R71. The 80C26-2 is listed as used used in the 20V1 and 20T1 chassis.

I have neither, and can't go any further.


Cheers,

According to what I can find out, the Thordarson transformer is for a set that used a 5V4 damper. My Admiral uses a 6W4 with an isolated hv winding for the filament, due to cathode being tied to it like RCA did.
Who was the big internet company that carried new old stock tv transformers?
I was told to call Mark Oprat. I did. He was friendly, but, doubted he'd have one, and, said he couldn't look for 3-4 weeks. He said to talk to Gary at play things of the past, and, he didn't even want to take the time to look up part numbers. He said I must have all the factory data, including exact sizes, ratings, etc....
Not having much luck here...Hasn't anyone got a spare set they could part out??

All of the transformers you have listed and the Thordarson have 3 secondary windings - B+, 6.3V and 5V. No difference between them that I can see.

Look at the schematic on ARF (page 26 of 26) - the damper filament is fed by the power transformer.

Cheers,

Why not use a stand-alone 6.3V xfmr for the damper heater?

I had two new old stock stand alones, and, they were both shorted.
They have to be rated at 2KV insulation due to the pulse.
I know the damper gets it's filament power from the transformer. It's a separate 6volt winding rated for hv insulation....
Called Moyer electronics. They are going to call me back on availability.....
I'm also looking for a power transformer for my RCA 8TR29. It works, but, due to past severe dampness, has a lot of leakage from primary to chassis.
See my post on it in my forums. I actually had the set playing last year...

According to the schematic, the 6W4 damper tube filament is in parallel with all the other tubes - no separate filament winding :scratch2:

So apparently Bill's is not really a 21D1 chassis? Seems like that chassis number should be stamped on the back side of his chassis.

After jogging the old memory cells, i don't recall ever seeing damper tubes such as 6W4, 6AX4 etc. using a dedicated heater winding. They had adequate H-K breakdown rating and ran the heater off the common 6.3V winding.
(6W4 does not have the heater tied to the cathode. )

I suppose there's a possibility that at some point someone subbed a non original transformer with an extra damper filament winding.

Well, I could be wrong on the Admiral, then. Been awhile since I've looked at it.
But, RCA sure did have a separate winding for the 6W4 on their sets. Look at the schematics for the later 9T246, and, the KCS 47.
Thanks for the help, guys. I'm waiting for a replay from one company on both this transformer, and, the one for my RCA KCS26A.
In the meantime, I called a dealer in Livonia Michigan, whom, while it's doubtful he has the parts, remembered my old boss, Craig W Knox, being there occasionally to buy parts many years ago... He even remembered our shop name, Rainbow Television Service... Sure miss Craig. He's the best boss I've ever had.
Bill Cahill

Bad news on getting transformers... Moyer called me yesterday with bad news. They no longer carry antique power transformers, and, flybacks. They have run out at all three stores.
They still carry more modern stuff, but, are pretty much out of antique numbers, according to the message they left.
Can't anyone help me??

Unless you're concerned about 'absolute' authenticity, and still leery about running the 6W4 without heater isolation, why not run a 6AX4 on the common heater supply? it has the same basing and heater current (1.2A) as the 6W4.
If still concerned about H-K breakdown, put a fuse in the B+ line to the damper.

6AU4 is a little beefier, has the same basing, but higher H current (1.8A).

Bill
the RCA 8TR29 if it uses the same power transformer as a 9-t-246 or t-100 i should have one
mike

Bad news on getting transformers... Moyer called me yesterday with bad news. They no longer carry antique power transformers, and, flybacks.

I REALLY hate to hear that! They were a big bail out for me more than once and I don't know ANYONE left retailing vintage transformers!!!:no:

It's bad news for me also. I'm not worried about the damper anymore. I'm just worried about finding a transformer.
On the RCA they put in two 6 volt filament supplies, switched. One for tv., other for radio. I doubt the T100 tranny will work.
I don't know what to do now..........

Looked further - the 80C26-2 has a higher current rating on the 6.3V winding, else it's the same as the 80C26-1. The additional current capability was to power the phono amp tubes. Both cross to the same Thordarson and Triad part numbers, so the mounts are apparently the same, and both sets used a 6W4 damper, with the filament fed from the power tranny, no separate filament transformer for the damper.

Triad's cross reference is online if you need it:

http://www.triadtransformers.com/tv81.html

So if you need a transformer, give Play Things of the Past a call. They are likely the only ones out there with a tranny.

http://www.oldradioparts.com/2a23efl.txt
4593-003 POWER ADMIRAL 80C26-2 300-0-300V @200ma, 5V @3A, 6.3V @8A, FIG 2, BOT WIRES,USED 1 4 1/8 3 1/8 3 3/8 $17.00

And no, I have no affiliation with PTOP, except being a customer in 2010, for a part for my Dad's RCA 721TS.

Cheers,

Your RCA transformer should be a part #74046. Crosses to Stancor P-8153 and Thordarson 26R75. Keep your eyes on ebay and one will show eventually.

I tried calling playthings two days ago, and, they weren't friendly. They said they don't go by part numbers. Said I would have to give them All factory specs on it.

I tried calling playthings two days ago, and, they weren't friendly. They said they don't go by part numbers. Said I would have to give them All factory specs on it.

Actually, they were quite friendly with me - I sent them an email with the listing from their webpage for the coil I needed, gave them the info from their page, and within a hour had a response with shipping quote. Six days later, I had my part. (And the day we got it going? Another, somewhat-working 721TS, GIVEN to us:D)

Read my earlier post - the page and info from their page is right there. Factory specs, part number, their reference, and their dimensions...... They put it out there, they should be able to supply it.

**I just noticed they may be on vacation... website shows no communication from 6-10 September.

Cheers,

:oOPPs. Wrong thread. Dumb, dumb.