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Re: [Amps] 3-500Z heater voltage reduction

To: "'MIKE DURKIN'" <patriot121@msn.com>, "'amps fourm'" <amps@contesting.com>
Subject: Re: [Amps] 3-500Z heater voltage reduction
From: "Phil Clements" <philc@texascellnet.com>
Reply-to: philc@texascellnet.com
Date: Tue, 15 Sep 2009 22:55:37 -0500
List-post: <amps@contesting.com">mailto:amps@contesting.com>
> Or some other common junk drawer stuff that would do the trick ... the
> last thing i tried was a .27Ohm 10W cement resistor and that was too high
> of a resistance ( was a bit surprised but oh well i dont know the internal
> resistance if the filaments anyways)
> KC7NOA ... i think i even have some nichrome sitting round some where.....
> 

Put the resistor in the primary of the filament transformer. This gives you
a free step-start; the in-rush current will be reduced. Get a 25 ohm 50 watt
resistor with a slider to adjust the voltage. You want to set 5 volts at
each tube pin. Not the socket, but the pin where it protrudes out the bottom
of the socket.

(((73)))
Phil, K5PC



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