Raj,
Thanks,
I have a fairly big toroid with me and my interest in 40M and up , so will try with that and see if its failing will come to you.The chasis is an old 486 machine cabinet, planning for a double decker construction with tubes on top and rest below.
73
Hari
From: Raj <vu2zap@gmail.com>
To: HamBrewers@yahoogroups.com
Sent: Sunday, April 21, 2013 6:22 AM
Subject: Re: [HamBrewers] 811 Filament choke value
Hari,
Try about 500 ohms (cathode input impedance x 10) inductive reactance at the lowest frequency of interest. That worked for me for my
4x811 amp.
I got better results from a ferrite rod but not one from a radio. I can give you a few of them. Probably 25 years ago I did not have the right toroid cores.
811A amps are very easy to rig up and run.. you can be a bit bold in experimenting..
73 Raj vu2zap
94 8384 3939
At 20-04-2013, you wrote:
>Hi,
>
> Can anyone guide me to some documents which gives the inductance needed for the filament choke, i don't think running behind ferrite rods is going to work. I need o figure out an alternate way using some big toroids.
>
>73
>hari
Try about 500 ohms (cathode input impedance x 10) inductive reactance at the lowest frequency of interest. That worked for me for my
4x811 amp.
I got better results from a ferrite rod but not one from a radio. I can give you a few of them. Probably 25 years ago I did not have the right toroid cores.
811A amps are very easy to rig up and run.. you can be a bit bold in experimenting..
73 Raj vu2zap
94 8384 3939
At 20-04-2013, you wrote:
>Hi,
>
> Can anyone guide me to some documents which gives the inductance needed for the filament choke, i don't think running behind ferrite rods is going to work. I need o figure out an alternate way using some big toroids.
>
>73
>hari
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