They are in series since they have only one wire in common. If they
had two wires in common, they would be in parallel. However the
CT-return allows one filament to light if the other filament is open or
if the other tube is removed. cheerz, Gene
On Jan 2, 2005, at 8:21 AM, Gene Bigham wrote:
Well now, let's look more carefully here. Filament transformer is
center
tapped, where does the CT go? In the middle of the two tube filaments
is a
choke labeled L11 which goes to #4 on a connector and a R1 which can be
shorted out by relay contact on RY1. Then in series is a parallel D1
R2 and
c36 to a f1(fuse) which connects to #5 on a connector. Son of a gun
connector point #4 goes to center tap on the filament transformer.
Thanks
Rich, guess the filaments are not series after all!
----- Original Message -----
From: "R. Measures" <r@somis.org>
To: "Gene Bigham" <jbigham2@kc.rr.com>
Cc: <amps@contesting.com>
Sent: Sunday, January 02, 2005 9:21 AM
Subject: Re: [Amps] Henry 2K
On Jan 2, 2005, at 5:45 AM, Gene Bigham wrote:
I own a 2K Classic X and a quick check of my schematic shows the
filaments are series, if one is out, both will be out.
Gene KB0GU
Is there a RFC between the filaments' mid-point and the neg. HV /
filament xfmr CT?
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Richard L. Measures, AG6K, 805.386.3734. www.somis.org
Richard L. Measures, AG6K, 805.386.3734. www.somis.org
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