[Amps] Help constructing filament choke for pair of 3-500Zs on 6 m

[Carl]

Do the math.

A reactance of 10 times the input impedance of the tubes is sufficient to 
have the choke "invisible" to the input RF.

Carl
KM1H




----- Original Message ----- 
From: "John Farber" <kg6i at comcast.net>
To: <amps at contesting.com>
Sent: Friday, June 28, 2013 12:02 PM
Subject: [Amps] Help constructing filament choke for pair of 3-500Zs on 6 m


>I could use some info on constructing a suitable filament choke for a pair 
>of 3-500Zs on 6 m, my current amp project. My gut feeling is a standard 
>choke design for 80-10 would not be correct due to too much inter-winding 
>capacitance would effectively bypass the RF around the choke and into the 
>filament transformer. Use of the standard ferrite rod as a coil 
>form/inductance magnifier would also be excessive. So what are folks using 
>in this type amp?
> Thanks, John
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