VOX valve reactor

[panchodiaz]

You'll never get 15W or more from a 12AX7, even if the valve is in the first stage of the amp section, the effective output power doesn't come from it, but from an IC power section...

Absolutely right, Didier, but you first said that the 12AX7 was in the pre-amp section, which is not correct, because it acts as a power tube in this case, amplifying the signal up to 1 watt only. Later, this signal will be amplified by the VR circuit up to the final power.

[Didier]

You'll never get 15W or more from a 12AX7, even if the valve is in the first stage of the amp section, the effective output power doesn't come from it, but from an IC power section...

Absolutely right, Didier, but you first said that the 12AX7 was in the pre-amp section, which is not correct, because it acts as a power tube in this case, amplifying the signal up to 1 watt only. Later, this signal will be amplified by the VR circuit up to the final power.

I only considered that anything ahead of the final output power stage is "preamp"...

Didier

[Bojan]

I love it when everybody's right!!

[ELET]

Just the opposite, Didier. Copied from the Vox website:

VR Valve Reactor
Originally designed for the critically acclaimed Valvetronix modelling amplifiers, the Valve Reactor circuit places a 12AX7 vacuum tube (or “valve”) into the power stage. Known as a dual-triode tube, the 12AX7 is actually two tubes in one. Our engineers have configured this tube to act as a small power amplifier...

http://www.voxamps.com/valvereactor/

You'll never get 15W or more from a 12AX7, even if the valve is in the first stage of the amp section, the effective output power doesn't come from it, but from an IC power section...
Have a look here, and you'll have confirmation : http://www.valvetronix.net/docs/AD15_30 ... manual.pdf

Didier

Yep! it's a solid state output. Manufacturers of solid state guitar amps have been trying to make buyers believe that they sound just like valve amps for years. The valve in the circuit is just the latest fad, (do you remember the FET phase?). I have some, (old USA built Peavey), solid state amps and they sound great for clean stuff but if I want a real authentic valve sound I use one of my all valve amplifiers. I must say that the Reactor circuit diagram looks very complicated, I can usually fix any problems with my old valve amps but I think that if I had a problem with one of those I'd bin it.