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[Amps] Heathkit HA-14 filaments

To: <amps@contesting.com>
Subject: [Amps] Heathkit HA-14 filaments
From: Bill Fuqua <wlfuqu00@uky.edu>
Date: Tue, 31 May 2005 09:29:49 -0400
List-post: <mailto:amps@contesting.com>
     To my surprise I found that the filaments of the HA-14 were not driven 
by a center-tapped AC filament transformer when using the AC power supply. 
I can see that this can be a real source of 60 Hz modulation on a 
signal.  Has anyone used these for CW using the AC power supply?

73
Bill wa4lav

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