Observed something interesting. The chittering I hear on startup is the horizontal oscillator flipping out for a few moments. This is with the horizontal output tube removed, so the fly is not involved. (Still does it with the HOT installed, you just hear it more)
Anyone seen this before? Doesn't seem to matter if it's a hot start or a cold start, it always does this.
I scoped the waveform. The second trace is just on the B+ for reference so I can see when it comes up.
https://youtu.be/1-Gz7kmtnkY