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In the Forum: Audio Discussions
In the Thread: Cool running AB amplifier.. with good sound.
Post Subject: Monitor project for summer listeningPosted by cv on: 8/4/2006
R,
Please excuse me if this is straying from the subject... feel free to move.

Anyway, I was in NYC until Wednesday evening, and I assume I know what is motivating you to abandon Macondo/Melquiades in the hot summer months... what I don't understand is this:

You have a system which is, lower midrange and up, something like 109 db/W efficient, and very splendid with it (as is the bass, which, optimally,  requires Super M).

Why not build some low power solid state amps?

I would be very, very tempted to take 1 or 2 12V batteries, and use them to power some MOSFET followers, single ended class A.

For the source load, I would have some 1:1 bifilar transformers wound on nickel or amorphous cores, 2 such amps per stereo channel, one coupled to the Fane, one to the S2/T350. Effciency would approach 50%, you would only need to dissipate a few watts per channel and your 7 ohm Placette output could drive them with ease.

Ok, 3 per channel, an extra one for the fundamentals horn...

You wouldn't get the unique "reality-reconstruction" effect of the 6E5p, but it should be super transparent and would free you from the ravages of daytime electricity.

Ie each amp circuit consists of a mosfet, transformer and cap couple biasing circuitry (depending on DCR of transformer). Shared lead-acid psu. Not much at all.

For the bass - well, I think you may have to bite the bullet and find a non-insulting, more conventional solid state amp. If the Zarathustra is truly 150W in class A, I shudder to think how much power it is blasting into the room (ie not via the speakers).

I have no experience of the proposed scheme, but am very close to trying, given the 110 degree weather...

cheers
cv

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