Solid state phase inverter

[shredator]

Hello, does anyone know of a good solid state phase inverter design? Ideally, I would like something that has a low output impedance, so that I can drive the next stage's grids positive. Is it possible to design a conventional gain stage that has no gain, but low output impedance? That and a regular source follower would probably do the trick.

If anyone has any suggestions, I would appreciate hearing them
Thanks

[Steve Conner]

Yes, you can design a gain stage that has no gain but a low output impedance. It's called a source follower.

[J M Fahey]

As Steve says, yes, you can make your SSPI , maybe roughly copying the traditional Fender type, but coupling each "plate" to a 400V Mosfet´s "grid", their "plates" to +B and their "cathodes" to ground through 47K resistors or even 22K, if you want more current. They will source far more current than they will sink, but it´s OK because you need a beefy "upswing" to drive the output grids positive , and a normal "downswing". You´ll need to do your homework biasing the beast, protecting MosFets gates, etc. As a side experiment, you might use MJE340´s in a similar configuration. Try it and post results here.