That would be a new issue, right? I mean, if the amp at least partially worked before, this must be something that's happened while it's been inactive over the years? Oh...I should mention: My dmm isn't automatic. It was manually set on 1000 volts DC the whole time, and doesn't measure fractions of volts at that setting. Maybe that's why it read zero.
Edit. Nah. Turned down to 200v range, where it measures to a tenth of a volt, and nothing on the cathode of the first stage. On 20v range and 2v still nothing (with 2 and 3 decimal places). I'm assuming I'm supposed to be measuring relative to ground, right? IE, the chassis?