The 25 ohm 25 watt resistor in HV power supply B- line is a very common failure with Henry RF Amplifiers. This resistor connects from the negative HV rail to chassis ground. It is used for HV current imitating in case of a HV over-surge (kind of like a fuse). When it opens the HV plate voltage will drop to zero when the amplifier is keyed.
To test the resistor, remove all AC power from the amplifier, then remove the covers to expose the HV power supply. You must remove the wires from one end of the resistor, taking it out-of-circuit, then you can use a simple OHM meter to check the resistance. A good resistor should read ~25 ohms in both polarity directions.
2K Classic - R109 (25 ohm / 25 watt)
Enhancement Modification Recommendation:
On my Henry 2K Classis I removed the 25 ohm 25 watt resistor totally, and connected D106/C114 direct to the B- HV rail. I then added four 10 watt pulse resistors in serials with the B+ HV side as current limiter. This modification was suggested to me by Tom W8JI.
