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OP Tx for signal tubes in Headphone amps

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Just a quick question,

What Output Tx's have you used for small signal tubes like 12au7 or EF86 to drive Headphones?
Thinking single ended..

I have only seen line driver Tx's with 63k to 300 Ohm?
What primary impedance have you used..25K etc
Any ideas where can you get them?

Regards
M. Gregg

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