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That's very cool, Zero Cool..

Posted by Lew (A) on June 6, 2008 at 07:32:17

In Reply to: RE: Someone Please Explain. posted by Zero Cool on June 5, 2008 at 19:27:55:

But I suspect that in this case what we have is a balanced all-tube voltage amplifier stage driving a solid state output stage, either MOSFET or other. By their very nature (low output Z, high current capacity), such devices do not need to be capacitor- or transformer-coupled to the driven speaker. So they are/were within the bounds of truth to call it an "OTL". Tenor made their bones by building an all-tube true OTL that made about 75W per channel. Toward the end of their existence they also built this hybrid amp (tube input/ss output) that made about 200W. Lots of reviewers drooled over the all-tube OTL, but I never saw a review of the hybrid. The Moscode amplifiers built by George Kaye, which represent the fall-out of the NY Audio Lab company that used to make Futterman-type all-tube OTLs, are very similar to the hybrid Tenors, though I don't know that the Moscode has a balanced topology. Counterpoint also made hybrid amps of this type, and I'm sure there are others. The point is that there is nothing brand new about the Tenor hybrids, though the execution may be excellent.

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