[Amps] FW: 3-500z Silly question

[MIKE DURKIN]

From: patriot121 at msn.com
To: w7ry at arrl.net
Subject: RE: [Amps] 3-500z Silly question
Date: Sat, 5 Sep 2009 10:25:16 -0700








Center Tap ??

Measurements have been made from the choke to each 3-500z filament ... then divided by 2 ...
I have solved my issues with marginal voltage for my 24V relays. I was hoping that the 12V witch was running 17V would be enuff to energize them .. but alass no .... so a voltage doubler was added and now i have good voltage and action from/for the relays.

New question .... im using a MFJ 259 analyzer to check the input C-L-C network's for each band ... and its not good.
The question is - does not having plate voltage affect the input impedance and frequency that much ( alot !!!) - im thinking that the input caps have been overloaded and now cooked ( wich might mean that the tubes in this amp were over driven too )

KC7NOA



> Subject: Re: [Amps] 3-500z Silly question
> Date: Sat, 5 Sep 2009 07:32:23 -0700
> 
> How are you derive the center tap for the cathode connection with DC 
> supplied to the filament?
> 
> 

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