There is substitute for experience.
73
Bill wa4lav
________________________________________
From: Amps [amps-bounces@contesting.com] on behalf of Paul Baldock
[paul@paulbaldock.com]
Sent: Friday, June 28, 2013 6:23 PM
To: kg6i@comcast.net; amps@contesting.com
Subject: Re: [Amps] Help constructing filament choke for pair of 3-500Zs on 6 m
The standard ferrite rod that you use for 10-80M works fine. I've
moded quite a few amps for 6 M and I remove half the turns from the
original choke. This reduces the inductance by a factor 4 and works
great for 6M.
- Paul
- At 10:20 AM 6/28/2013, Carl wrote:
>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@comcast.net>
>To: <amps@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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>>
>>
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