[Amps] Excessive Henry Amp Hummmmmm

[Mike Krzystyniak]

    I recently checked out a Henry 2002A 2M amp and 2004A 432 amp for a
friend.

    Compared to my Commander II the 2004A amps noise (blower noise and
residual hum) is a good 10dB louder.  But the 2002A is at least 6-10dB
louder than the 2004A amp.  It sounds like more like mechanical resonances
and I hear some droning with the blower.  I have tightened up a few loose
screws but overall the noise is still unacceptable.

    Has anyone had a similar experience with high residual noise from these
amps?  Has anyone had any success in reducing the noise?

   Thanks in advance.

73  Mike   K9MK/5