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Single Ended Triodes (SETs), the ultimate tube lovers dream.

My real interest is basic.

Since you understand OPTs better than I do, can you at the very least can you tell me what is the primary impedance of those OPTs and why is it not problematic to use 2A3, 45, 50, 300B, PX25 and 845 tubes with the same OPT?

If anyone else knows the answer please feel free to reply. I don't understand it and I would appreciate it if someone at least held shed light on the subject (sincerely).


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