[R-390] atf4 ballast tube

[wglevy]

Roy,
Just out of interest what size resistor do the boys put into place of th 
ATF7?
Bill
N2WL

----- Original Message ----- 
From: "Roy Morgan" <roy.morgan at nist.gov>
To: <doorbar61 at tiscali.co.ukm>; <R-390 at mailman.qth.net>
Sent: Monday, December 20, 2004 11:18 AM
Subject: Re: [R-390] atf4 ballast tube


At 06:44 AM 12/19/2004, you wrote:
>hello to everyone happy xmas. have just fitted atf4 ballast tube in 390a
>and it seems to be working fine.it glows a little more than a atf7. can
>anyone tell me will this give me any problems. many thanks brian

Brian,

The current delivered to the regulated tubes is likely to be wrong. Do test
the voltage at the output of the ballast tube to find out.

The ballast tube is likely to not last very long. It is being operated way
above it's current design range. That's why it "glows a little more".

You would be better off with a fixed resistor.

Roy


- Roy Morgan, K1LKY since 1959 - Keep 'em Glowing!
7130 Panorama Drive, Derwood MD 20855
Home: 301-330-8828 Cell 301-928-7794
Work: Voice: 301-975-3254,  Fax: 301-948-6213
roy.morgan at nist.gov --

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