I bought a[nother] 7704A that is dirty but shows promise as it's a later S/N and has Option 9. It had blown fuses and I traced the main 4A fuse to a shorted bridge rectifier. After finding a temporary replacement, the power supply was working on an external load. I then connected it to the scope and, aside from the Z-Axis not working properly (big, bright, uncontrollable blob on the CRT), things appeared to at least be working. After about a minute of run time, one of the tants on the horizontal amplifier board went out in a blaze of glory. Nasty. I now know what you guys were talking about regarding the stink! At least it didn't explode and create even more of a mess.
Fun stuff...
Thanks,
Barry - N4BUQ
