The optional Powwer Supply cooling fan on my Alpha 87A Amplifier (externally
mounted on rear of cabinet) needs to be replaced. The normal thing to do would
be to replace it with another of the same brand, size, ratings. It is an EBM
PABST Model 4580Z, and they are still available from a few suppliers.
It is disconnected now, and it is amazing how much quieter the amp is without
this fan. I have had other owners tell me they don't have one installed for
that reason. I have also had others tell me then have one installed, but have a
switch so that they can have it off most of the time, but on for high duty
cycle modes like RTTY.
Has anyone found an equivalent blower of the same size that is quieter, but
that still does the job?? Since ETO/Alpha didn't install one on the amp to
begin with, its need must be marginal. They advertise full time key down
operation at 1500 watts so you have to wonder why it is needed in the first
place. Your help and information would be appreciated.
Thank You
John Owens - N7TK
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