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A 6Y6GT/6922 P-P Amp with MOSFET Concertina Splitter

Nearly two years ago, Eli coached me on starting this amp, providing some "hen scratches" for the various sections. I had asked the forum about driving 6y6GT tubes in push-pull, and Eli responded with the idea of using a 6922. He also knew of several transformers and passive components that I already had on hand in my bins. (I'm frugal when possible.) So he sketched out the stages with those components in mind.

Besides using available parts on hand, I added some new parts options in the event that others might be interested in building this. For example, I found a couple of nice Edcor power transformers that are cheaper than purchasing both the Triad N-77U isolation transformer AND a needed booster transformer. These Edcors have sufficient specs at a good price, and they come with end bells if you need the cosmetics. :-)

This amp was also designed to allow experimentation with some other features I had either not yet built or had not experienced by listening. Here are some of those features:


The result is a great-sounding amp that is highly tunable on the bench.

In this thread, I'll report the bench measurements of a working breadboarded amp along with the current schematics. The original thread with Eli's hen scratches is here:

Driving 6Y6GTs with El Cheapo 12AT7 front end?

Thanks also go to Michael Samra, Jim McShane and Don Sachs for their input and help as well. Miles Prower, Tim Robbins and Mark Weiss on diyAudio helped with on-bench 'scope measurement questions, too.

--Jeff Yourison


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Topic - A 6Y6GT/6922 P-P Amp with MOSFET Concertina Splitter - jyourison 10:32:15 03/28/15 (26)

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