Heathkit SB-401 Assembly Manual page 121

or modern DMM or scope
this shuts down the finals.
V9 is removed
Step 1, Het OSC.
warning 800vdc present
This is the banana Jack on top of chassis , on top
of the Y bank of crystals.
In my case I used a scope to the other side of
R27 100k ohms away from the banana pin.
or scope
THE BANDS WILL BE DEAD IF THE CRYSTAL IS MISSING
E pin is small coax pin.
Key means the rear 1/4" phone
jack morse key
Still in CW mode
STEP2