I can sell you a filament transformer from a SB-220 and that would solve the
filament problem.
-----Original Message-----
From: Peter Voelpel <dj7ww@t-online.de>
To: 'Jim Durham' <jimdur@gmail.com>
Cc: amps <amps@contesting.com>
Sent: Mon, Aug 15, 2016 2:17 pm
Subject: Re: [Amps] SCR to adjust 240v to 200v
There is and was no European country with 200V mains.
You don´t need a variac, just use a 40V transformer and put it in the
primary of the hv transformer with the proper phasing to subtract 40V.
73
Peter
-----Original Message-----
From: Amps [mailto:amps-bounces@contesting.com] On Behalf Of Jim Durham
Sent: Freitag, 12. August 2016 19:07
To: amps@contesting.com
Subject: [Amps] SCR to adjust 240v to 200v
Hello all,
This is my first posting, so Howdy..
I have a Henry 2k-2 (modified to take 3-500Zs). After I bought it, some
years back, I fired it up and tube filaments were very bright and HV was
high.
Talked to Henry. They asked me the plate transformer number, which they
looked up and said "Oh, that's the 200v European transformer". So, I put
a hefty variac on the 240v AC incoming and all is fine, except I'd like
to ditch the variac and was wondering about if anyone on here had any
wise words about using an SCR instead to back the AC voltage off.
My experience with big SCRs (TV studio lighting) was that they tend to
put out a lot of RF hash. I also wonder about how the choke and filter
cap in the power supply would like non-sinusoidal AC waveform?
Anyone have any experience with this?
Thanks and 73,
Jim, W2XO
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