In Reply to: TFA-204 300B Operating Points posted by jdrouin on March 7, 2017 at 12:34:03:
The dc plate current rating on the TFA-204 is conservative and can run at 60 mils all day long without breaking a sweat. All the while preserving adequate AC (the musical signal) headroom.
The operating points you posted but appear to be wary of... actually don't look all that bad (at all I might add).
re: power rating. the difference between four watts, six watts, or eight watts output translates into very little difference in loudness in terms of driving a speaker. It's most likely that any speaker that is not happy with four watts output will be equally unhappy with eight watts driving it.
Also bear in mind that a set of operating points with reduced idle current
can be optimized by regapping (with a smaller gap) the output trans and hence gaining valuable primary L.
Remember your "real" impedance is the product of the primary L in parallel with the reflected load impedance from the secondary.
Re: recollection of George's operating points for the amp in question I do not have that data.
MSL
Builder of MagneQuest & Peerless transformers since 1989
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Follow Ups
- RE: TFA-204 300B Operating Points - mqracing 14:33:19 03/09/17 (3)
- RE: TFA-204 300B Operating Points - jdrouin 18:50:31 03/09/17 (2)
- What's the Turns Ratio of the TFA-204? - jdrouin 20:10:37 03/09/17 (1)
- RE: What's the Turns Ratio of the TFA-204? - mqracing 20:56:50 03/09/17 (0)