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RE: TFA-204 300B Operating Points

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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