When I rebuild or upgrade power supplies for the L4, L4B, and L7, I have some "special" fans that I use. A few years ago, after trial and error experimentation, I found some muffin style fans rated for 220 vac BUT they start reliably and run consistently and totally quiet on 110 vac. Some stick-on thin felt dots on the corners, and just the small amount of air being pulled out of the power supplies, and RF decks, on those amps really brings down the temperature. Haven't had a capacitor, diode, or bleeder failure since using these fans. No reason why it wouldn't help for the receivers and transmitters.
Enjoy those Drakes! -----Original Message----- From: Dennis Monticelli <[email protected]> To: Richard Knoppow <[email protected]> Cc: drakelist <[email protected]> Sent: Sat, Jul 17, 2010 12:23 am Subject: Re: [Drakelist] Fan on R4B I do the same thing with my R4B. You'll find that even if you slow it down significantly to allow it to run even quieter, the cooling effect is almost the same. A 5" fan moves a lot of air. Dennis AE6C On Fri, Jul 16, 2010 at 5:51 PM, Richard Knoppow <[email protected]> wrote: Its too hot in Los Angeles so decided to try the fan I made up for my T4XB on the receiver. It works like a charm. The R4B tends to run hot anyway, I put the fan on top of the cabinet, over the power transformer, blowing out. It keeps the cabinet quite cool and even the transformer stays reasonably cool. This is about a 5" AC fan just connected to the line though a power cord switch. I will have to build another so I have one for each unit. This fan makes very little noise. I wrapped some foam type weather stripping around the case so it sits on the foam. This both seals it to the cabinet and cushions any vibration. -- Richard Knoppow Los Angeles WB6KBL [email protected] _______________________________________________ Drakelist mailing list [email protected] http://mailman.zerobeat.net/mailman/listinfo/drakelist _______________________________________________ Drakelist mailing list [email protected] http://mailman.zerobeat.net/mailman/listinfo/drakelist
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