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Re: [Amps] SCR to adjust 240v to 200v

To: amps <>
Subject: Re: [Amps] SCR to adjust 240v to 200v
From: Ron Youvan <>
Date: Fri, 12 Aug 2016 15:00:00 -0400
List-post: <">>
  On 08/12/2016 01:07 PM, Jim Durham wrote:

/* snip */
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.

  I would measure the incoming line Voltage RMS then I would locate a
used 240 Volt to (normal Voltage - 200) Volt transformer and buck the:
240 - 200 = 40 Volts at enough Amps with it.
  SCRs are headaches just waiting for you.

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?
  Ron  KA4INM - Youvan's corollary:
                Every action results in unwanted side effects.
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