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What's the Turns Ratio of the TFA-204?

72.192.68.101

In Reply to: RE: TFA-204 300B Operating Points posted by jdrouin on March 09, 2017 at 18:50:31

I'm trying to model a circuit in LTSpice and the B+ is dropping way too much as it goes through the 3K primary of the TFA-204 to the plate of the 300B. Either I'm using the software incorrectly or 3Kohm might not be the actual value affecting voltage.

A Help Page at DIY Audio Projects says, "To determine the load resistance for the desired given speaker load, square the turns ratio you calculated and multiply that number by the desired speaker load (i.e. 4, 8, 16 ohms)."

Can you tell me the turns ratio of the TFA-204 so I can calculate this?

Thanks,

Jeff

Follow Ups:

RE: What's the Turns Ratio of the TFA-204? - mqracing 20:56:50 03/09/17 (0)
The turns ratio is the square root of the impedance ratio.

The nominal impedances of the 204 is 3k primary and 16, 9, and 4 ohms.

Therefore the turns ratio from primary to say the 9 ohm secondary tap is 18.26 to 1.

MSL

Builder of MagneQuest & Peerless transformers since 1989

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