[AMPS] Alpha 77 PS Parts

[Mark Stennett]

I had to replace the step start and HV bleeder resistors in my Alpha 77 
recently. The step starts had failed due to dirty connections on the 
shorting relays and the first bleeder in the string had developed an open on 
the HV side which would arc and glow when the rig was on. Finding suitable 
replacements for the step start resistors was not difficult. Locating 
suitable replacements for the bleeders however was a real challenge. Heads 
up to the list - Clarostat has stopped making the 150K - 250K resistors in 
the VP50K package. They told me that they have 30 on the shelf. When they 
are gone to the next distributor, they will no longer stock them. My 
research into suitable replacements leads me to believe that other 
manufacturers of 50 watt/150K wire wound vitreous enamel resistors make them 
larger than the original Clarostat components used in the Alpha which could 
prove to be a challenge for mounting. Anyone here had similar experiences?

On another note - the Magnecraft HV contactor can still be acquired new from 
Allied.

73 de NA6M


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