• WARNING: Tube/Valve amplifiers use potentially LETHAL HIGH VOLTAGES.
    Building, troubleshooting and testing of these amplifiers should only be
    performed by someone who is thoroughly familiar with
    the safety precautions around high voltages.

What circuit to build with MQ TL-404

If you had a pair of Magnequest TL-404 autoformers for output iron, what circuit would you build?

I want to build a headphone amp with these beauties but I can't seem to find a parafeed circuit to start with.

I've seen the espressivo, but $400 WE output tubes are not where I want to start.

I'd like to keep the tubes to something I can obtain regularly and a circuit that isn't too complicated with room to tweak.

Any Ideas?
Look at the L'espressivo, and just sub these in. http://www.ecp.cc/less-pressivo-build.html

There are gobs of tubes that will work fine, many of which areprobably a better choice than the originals used both in terms of cost and performance.

I also have a L'espressivo + with some clever tweeks, and I am working on a L'espressivo ++ with some very clever tweaks that should put it as a much better design than the original, for less money. Send me an email dsavitsk at ecp.cc and we can discuss.

I liked the look of that design earlier today...

I want to try a parafeed circuit with this iron because I'm looking for a big step up in sound quality.

My problems are that I don't know enough about tubes to be able to change tubes in a circuit and make it work. I pretty much take existing designs and put them together hoping they sound good enough.

I'll send you an email