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anybody know of an Amplifier that uses a combination of Valves and SS (Bipolar or Mosfets) in signal stage? Maybe in parallel or such that the SS runs in the class A bias "world" and the Tubes take over for those big voltage swings. I'm imagining a circuit with a reference amplifier and a "big swing" amplifier - maybe in the Stasis topology?
Heck i never think of anything new - in audio it's always been done before ... Twice!
Three most important things in Audio reproduction: Keep the noise levels low, the power high and the room diffuse.
Follow Ups:
Do you mean tubes as drivers or tubes (power?) acting in concert (somehow) with discrete SS devices in the SS output stage.
It is most common to see tubes as drivers in hybrid amps, but I don't know about the second options.
"You don't need to be a Weatherman to know which way the wind blows"
no sorry, I was thinking of the primary output stage of the amplifier made with cascaded and mixed devices. lets just say The Solid state output runs class A to 10 volts and the Tube device take over to 1000 Volts. Both devices connected to the load (or transformer) it would take some interesting bias workings to do it.
Three most important things in Audio reproduction: Keep the noise levels low, the power high and the room diffuse.
I can think of two examples using different output device strategies: AVA and Audio Research
Frank Van Alstine has been a hybrid advocate for some time. His Fet Valve amps use tubes for voltage gain followed by mos-fet drivers before the mos-fet outputs.
AVA 400R
Audio Research has also made quite a few amplifiers (along with line stages) that use a mix of FETs and tubes in the signal stage while using tubes for output. Here is one of many:
ARC VTM200
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