Cecil:
Not having heard the tone of the buzzing, I am taking a shot in the dark.
However, I have had two pieces of older equipment, 35+years old that also
buzzed.
I finally found on the first one after a bit of hunting, that the power
transformer through bolts were loose! Upon tightening them to a proper
level, the buzz disappeared. The same proved true with the second
transformer, several years later.
Just one possibility -----
Chuck W9POU
-----Original Message-----
From: amps-bounces@contesting.com [mailto:amps-bounces@contesting.com] On
Behalf Of Cecil Acuff
Sent: Saturday, January 30, 2010 9:45 AM
To: amps@contesting.com
Subject: [Amps] 30S-1 Questions
Hi Folks,
I have had the good fortune to have a near mint 30S-1 given to me. It is a
real piece of art for sure. All original and reported to only have around a
150 hrs. of operation on the clock. Still sporting the plastic on the front
door of the power supply.
I cleaned it up and gave it a serious visual and found a jumper in the 3
minute time delay relay socket. Had a new one so I fixed that. Amp came
with a spare tube, a pull stamped as having 1000 hours on it so I assume it
was a military pull. (4CX-1000A)
I have read for years how quiet the cooling systems are in these things and
all I have read is true. But if this amp is typical, all that design was
wasted because the loudest thing is the HV power supply buzz...not the
fan/cooling system.
Is this typical for these amps. With no load it's noisy...under load it
quiets down a good bit but is still audible. I really expected that part to
be pretty much silent.
Any history or experience on quieting this thing down would be helpful.
Otherwise I love the amp.
I get around 700w out on CW on 400ma and 1kw on voice peaks on my bird 43
with 300ma peaks on the Plate meter. Never a sign of grid current. Not
pushing it too hard.
Thanks..
Cecil Acuff
K5DL
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