Boys and girls, this was a timely subject
I should have by the end of the month a few prototype pcbs for a fan controller for the drake radios. They will work with ANY TR series as well as any of the R series receivers Without getting into too much details, the circuit is contained on a small double sided pcb. Two wires are required with a third one optional power is stolen from the 6.3 v ac filament from the back of the dial light here's how it works when you turn your radio one, the fan will come up to full speed for three seconds then automatically drop down to a speed you set by a trimmer. The high to low speed is designed to give older fans or larger fans enough juice to start. After they get spinning, they drop to the other lower speed, again that one is adjustable, too. if you use the third wire connection, it goes to the external amp key line and when you go to tune, or transmit, the fan will automatically go back to high speed, again you set how fast 'high' speed is the pcb is about 2" square. will drive any 12 vdc fan up to 500 ma. will work on any tube base radio be it a transmitter or receiver. cost TBD, but about $25ish dollars mike Mike, WB8VGE SunLight Energy Systems The Heathkit Shop http://www.theheathkitshop.com/ J e e p o|||||||o A man with one clock knows what time it is. A man with two clocks is never sure. On Aug 22, 2011, at 11:49 PM, Don Cunningham wrote: > It's a VERY good idea to run fans on the tops of our tube Drakes. Tubes are > getting higher and higher and harder to find. A slow moving fan, sucking air > out of the cabinet will lower the temperature to cool to the touch, in my > experience!! I put rubber feet on the fans or a piece of insulating foam > around the rim, and let them run. Good 220v ones will run slowly on 110v, > and provide plenty of cooling. > 73, > Don, WB5HAK > > _______________________________________________ > Drakelist mailing list > Drakelist@zerobeat.net > http://mailman.zerobeat.net/mailman/listinfo/drakelist
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