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RE: Doing SET Backwards

My initial thoughts about that pre are that there some nice technical solutions to keep costs down and it would probably provide nice technical performance in a wide variety of systems... though gain is what I would call high. Whether one would like the sonics is personal.

A gryrator (often referred to as an electronic choke) has been used in place of a physical choke (inductor). The output is capacitor coupled, with the 510k resistor providing the load in parallel (I think) with the input R of the amp being driven. Gut feel is that I'd prefer a transformer in place of the gyrator and coupling cap... but that demands a bit more planning and could be less flexible.

the Coleman regs are supposed to be good-sounding. BUT, IIRC Jac does not warrant his EML tubes for use with them. I'd use something like the custom low noise version of the Tent Labs filament supply and a more typical cathode bias arrangement; more expensive though. I'd also use the 20B version that has a CT connection for the filament.

Just my rushed 2c - others will differ in their take.

Cheers,
91.

"Confusion of goals and perfection of means seems to characterise our age." Albert Einstein


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  • RE: Doing SET Backwards - 91derlust 04/29/1920:35:00 04/29/19 (1)

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