Voltage Swing

[Lost'n Found]

Hello.

I am using PSPICE to simulate the output stage of a tube amplifier. I am
using a 420v DC and an output transformer.

The voltage on the plate of the tube swings between 840v and 420v. I know
that the output transformer opposses the current change, but I thought that
the voltage should swing up and below the 420v, not between 840v and 420v.

Is it operating correctly? I mean can the voltage swing between VDC Max and
higher?

 

[Robert Baer]

Hello.

I am using PSPICE to simulate the output stage of a tube amplifier. I am
using a 420v DC and an output transformer.

The voltage on the plate of the tube swings between 840v and 420v. I know
that the output transformer opposses the current change, but I thought that
the voltage should swing up and below the 420v, not between 840v and 420v.

Is it operating correctly? I mean can the voltage swing between VDC Max and
higher?

Insufficent information.
Push-pull?
*SOMETHING* is driving the xfmr to increase the plate voltage that
you speak of.
A single-ended class A tube driving a transformer primary with a
matched load will (a) have a plate voltage swing equally above and below
the supply voltage, and may have a problem saturating the transformer
due to the DC current.