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In Reply to: RE: Transformer ratio?? posted by Tubenstein on March 10, 2017 at 05:59:37
It depends on the load impedance (an earphone I suppose).
If both triodes have a nominal bias close to @15 mA/@ -2V and the earphone nominal impedance is 32 Ohm than I would guess something close to 1:4/1:5 voltage ratio.
What about the primary impedance of such a line output transformer?
IThe primary impedance is equal to load impedance (32 Ohm in the example) times the voltage ratio (1:4 to 1:5 in the example) squared, that is, from 4 X 4 X 32 = 512 to 5 X 5 X 32 = 800 Ohm.
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