Re: Voltage Swing

Lost'n Found wrote:

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.
.