I have an Alpha 89 I am selling here for a friend who is no longer able to use
his equipment. I have a sale pending but the buyer is sceptical about the
condition of the finals. I have carefully tuned it up on all bands into a Bird
load with a Bird wattmeter, 2500 watt slug. Typical readings are 2500 volts, 1
amp, 60 ma grid current, and 1600-1700 out with 50 watt drive. Increasing
drive a little gets more grid current, but peaking the tune and load for max
out doesn't improve things. Power out doesn't sag. It's as if there was a
governor on the amp !
Some say that amp should produce an easy 2200 watts and the tubes are soft. If
so what kind of life could be expected from them? A tough question I know,
depends on the use. So maybe in percentage terms could it be estimated how
much of the original life is left?
Rick K2XT
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