1940's Thordarson transformers

[shzmm]

Hello,

I have a few 1940's era Thordarson transformers that I picked up recently from a strange piece of equipment and was hoping to find out what I may be able to make of them.
The most obviously interesting one would be the T-49436 Output transformer.
The face plate reads "Audio Transformer class output ratio p/s .485/5.9"
When I put a 12VAC line on the "p" and "b" (plate and base?) I read 2VAC on the "600 ohm" output. The transformer also has two "S2" connections and a center tap. These read 12VAC off each leg referenced to the center tap.
It seems to me that this would be used both as a line output and some sort of interstage PI transformer? Am I correct in my calculations that the turns ratio is 6:1, then the impedance ratio is 36:1 meaning the reflected load will be around 22k at 600ohms?
What type of tube would like to see that sort of load? I'm hoping I understand this correctly if not please let me know! Thanks for any replies.

[6267]

Is it a big output transformer? Medium? 22k is a very high load for most power tubes. That would be a reasonable load for a 6sn7 or other medium-mu triode with similar plate resistances. "P" is plate, which would go to the 6sn7 plate. "B" is most likely for B+, i.e. this is a single ended transformer. That means you could use it as a phase inverter, running each 600-ohm lead to a power tube's grid with a small (10k or so) resistor to ground. This would be capable of driving the power tube grids positive, thus allowing full class A2 or B. This means LOUDER. Your calculations appear correct wrt the impedances, I would double check all terminals though. There is hopefully a DC bias current max written on the transformer, as well as frequency response? You really only need 150hz or so as a the low knee, especially for guitar or vocals.
*(I've only seen one thordarson output in person, and it was mil surplus...it was potted and had tons of info on the top).

[shzmm]

Thanks for the reply 6267,
The transformer is medium large actually. It's around 5cm (2") square and 7cm (3") high. I also thought it might have that purpose of a PI transformer, although interesting that you would take the signal off the 600ohm outputs. What then are the second secondary outputs for do you suppose?
I'm guessing that it would be suitable for a mic preamp output.
There is no further information on the faceplate other than what I wrote before: the ratio of primary to secondary, class, etc.
I guess I'll just have to hook it up to see.