[AMPS] CW amplifier progress (well, daydream progress) -- long

[Peter_Chadwick@mitel.com (Peter Chadwick)]

Vic says;

>My SB1000 uses a muffin fan to cool the tube and seems quite noisy.  I
would
>like the one I'm building to be quieter.  

They get noisier as they get older, especially if they have ball races
rather than  plain bearings. I scrounged a nice blower - more than  enough
air flow to give 0.6 inches water gauge on a 4CX 1000 - but oh! so noisy.
The ball races were shot, and so I turned up some phosphor bronze plain
bearings for it. It's very quiet now. Incidentally, surprising how much
swarf you can produce with  a lathe and some 1 inch diameter steel
bar........On noise, the same thing applies with muffin fans.

73

Peter G3RZP


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