UTC LH-519/FH-757 xfmr info?

[multi-volti]

Hi:

I have a pair of UTC transformers marked FH-757 and North Atlantic 202348.
I found an expired auction on eBay for UTC LH-519 transformers that also displayed North Atlantic 202348 so I know they're equivalent.

They are marked 10k ct: 5k ct, 50 cps - 20 kc, 0.13W

I'm curious if these might be usable as tube/valve interstage transformers, and if so, what kind of DC current would be reasonable.

I found a schematic for the North Atlantic Instrument they were used in and they were used in a (solid-state) phase angle voltmeter, so I cannot infer what kind of DC current they might tolerate, or make too many analogies to tube circuits.

P=E^2/R for 10k and 130 mW = 36 v...not too encouraging, but I don't know what the power rating context was.

Thanks for your thoughts.

Murray

[multi-volti]

I found a Philco Radio history site that had a post recommending capacitor coupling to a IS primary to eliminate the DC. for longer life (probably referring to already-ancient radios).

That's another option...if they can handle much voltage...

[multi-volti]

I think these are not intended for tube/valve voltage levels...so they must wait for another opportunity to surface...