I have an usued Rotron blower, model 4140-00-853-2138, with a Series 331AS
motor, that I've built into a new homebrew amplifier. The blower, which I've
had for years, is perfectly matched to three GU74Bs, and is very compact.
It's the perfect blower for my application. However, I fired it up for the
first ime yesterday, but I hear a high-pitched whine from it (in addition to
the air noise) that doesn't sound right to me. The blower seems to rotate
smoothly, draws the correct power from the AC line, and takes many seconds
to coast to a stop when the power is removed. The motor has ball bearing
movements, and the blower itelf is mil-spec rated. The data sheet says it is
"humidty proof and salt spray resistant and shock proof and vibration
proof."
I'm wondering if the sound I'm hearing is normal, possibly ball bearing
noise or something associated with the humidity/vibration/saltwater
proofing? I sure hope so, because I've not got a spare and have no idea
where to find one. My assumption, possibly misguided, has been that a new,
mil-spec Rotron blower, should last forever. I found one company that says
they can sell me one for $1500, but I doubt they really have one, even if I
was willing to pay their absurd price. Any suggestions. I'd love to find
another one somewhere, or just the 331AS motor.
73,
Jim W8ZR
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