What circuit to build with MQ TL-404

[sbelyo]

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?

[Gluca]

You can use 6C45pi and many, many other cheper tubes to built that headphone amp. You really need to modify only a little bit the circuit.

Ciao
Gianluca

[dsavitsk]

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.

[sbelyo]

Thanks...

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