[TenTec] Centurion Amp - early model, looking for advice

[kr2q at optimum.net]

Hello,

I recently purchased this amp.  I read in the QST review that their review model showed
idle current when in standby.  I also read that TT later came out with a fix for that.

Well, the amp I just bought must have been very early and never updated, because it
shows idle current when in standby.  It gets hot pretty fast and the bottom "donut" on the 
tube glows red (while in standby).  Prior owner says, "Yup.  No problems with the amp."  No
problems, but I'd like this updated.

Can anyone help me identify how to fix this?  If your amp doesn't show idle current when in
standby, can you identify the circuitry that controls that and maybe share the schematic?

Something else?

Thanks,
de Doug KR2Q