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5mA DC transformer - tube output stage?

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I have a transformer labelled as follows:

PRI 15,000 OHMS AT 5ma D.C.

plus a bunch of secondary taps, 62.5, 150, 250 and 600 ohms.

Can this be used for transformer-coupling a line output stage in a tube circuit? It's that 5mA specification that concerns me ... a little too low for tubes? And I'm guessing a cathode follower would still be necessary for impedance matching to the 15K primary?
 
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