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[AMPS] Rotary Inductors in Amps

To: <amps@contesting.com>
Subject: [AMPS] Rotary Inductors in Amps
From: 2@vc.net (2)
Date: Wed, 12 Dec 2001 10:39:51 -0800
>
>What qualities should someone look for in a Rotary
>Inductor intended to be used in an amplifier Tank
>Circuit?

?  Keep in mind that the tank L carries approx. the [DC anode current x Q 
]amperes of   RF circulating current.  Thus, the tank for a pair of 
3-500Zs carries  0.8A x approx. 10 = 8Arms pf RF - which is equivalent to 
c. 30ADC in terms of conductor heating.  This is likely why Heath used 
two, paralleled 15A rated contacts for the SB-220 bandswitch.
-  When I build an Ugly amplifier, I drill 3mm holes in a grid pattern 
under the tank L to provide air cooling from the pressurized chassis.  

cheers, Bill. 

-  R. L. Measures, 805.386.3734,AG6K, www.vcnet.com/measures.  
end


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