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In Reply to: RE: Triode outputs on a Futterman... posted by Lew on February 24, 2015 at 10:29:52:
LewIt is not surprise for me that Fourier do not have big success by replicating original Futterman amplifier concept .
Since even if that early triode based Futterman OTL amp looks very simple on the paper ( schematic ) basically they are not so simple , since surprisingly they are designed almost as some modern SS PP amps , with very high OLG ~60db ,with~ 35 dB of GNFB , with one extra bootstrap loop around of phase splitter and with final target to represent close as possible pure voltage source for at that time standard 16ohm load(speaker).
Even simple wrong layout of passive and active elements on amp chassis can cause unstable operation for that type of amp, sometime inserting of some extra compensation elements is needed to suppress amp oscilation ...
Any way to make long story short ,original Futterman OTL amp concept can not successfully replicate anyone , pretty big knowledge and experience is needed for that , and even bigger for original Futterman OTL amps based on TV power pentodes.
Edits: 02/24/15
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- RE: Triode outputs on a Futterman... - Banat 15:54:52 02/24/15 (0)
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