Your issue 1. has not been addressed yet. The diagram around K600 is somewhat mysterious. Forget the text "to term. 12". The relay tube is probably either a 18NO45T or a 6NO45T. Only in the latter case R600 (33R, 2W) is present and soldered directly at the tube socket. The tube designation is printed along with it number K600 near the tube socket. The relay is a normally open type. Note that pins 8 and 9 are internally connected, and also 3 and 4. You can check the crude 20V immediately after switching on the scope since the supply is solid state (so you can switch off before the relay gets closed).
The heater is specified to take about 2 W, maybe you can check the heater that way. A tired bi-metal inside is possible also.
Once the relay K600 closes K601 is activated and its contact K601-1 connects 20V directly to its coil. The heater of K600 is switched off and K600 is not needed anymore. So if you are brave (and careful!) you can take the role of K600. Attach a momentary push button make switch between pins 4 and 9 of K600 and push (and release) it some 45 seconds after switching on the scope.
Albert
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On Mon, Nov 5, 2018 at 09:23 PM, YudaMan3 wrote:
1. start up time delay relay can be approx 30 seconds up to more than several
minutes or not at all. I guess this means the 20VDC from the regulated heater
supply is faulty or the thermal time-delay relay is having some issues
