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OTL, Output Transformerless Amplifier User Group.

I have an idea...

The operating instructions for a Zero suggest placing them at the speaker, not at the amplifier end of the speaker wires. So think of them as a modification to the speaker, not a conversion from OTL to OTC operation. Semantics can make anything feel better.

Otherwise, I think this is beating a dead horse. If one doesn't need the Zeros, then one should not use them. If one does need them, then one can either get a different pair of speakers more suitable to one's particular OTL, or use Zeros to mate the OTL to the speaker. (Or buy an OTL with more output tubes, more power, and lower output Z.) I don't think anyone ever said that the Zeros are needed as a matter of course, or as an upgrade, with an OTL. My experience was as stated: the combo of OTL + Zero sounded better than any of several OTC tube amps I tried, but I do prefer the sound now that I have eliminated the need for the Zeros. (On the other hand, the speakers are way different now that I modified them; I daresay they would sound better now even WITH the Zeros than they sounded prior to the speaker mods, with zeros.)

I've got a used pair that I would sell cheaply, by the way.

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