Check whether the HV LID crowbar makes a reliable short-circuit across the HV
wiring when the cover is missing.
4. Old Tube Removal.
W A R N I N G HIGH VOLTAGE!
===========================
Prior to continue you must be absolutely sure that there are no residual voltages
in the amplifier - see (2) and (3) above!
Be careful - the tube may be VERY HOT!
First unthread the temperature sensor (which looks like a small transistor), out
of the rubber chimney. Push gently the chimney towards the tube center while
taking care not to bend the three leads of the sensor and fully unthread it.
Now unscrew both M3 screws that hold the anode clip to the UHF suppressor (look at
the two red arrows in the picture below). Save the two screws and washers.
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