[Amps] soft start, how to determine if needed?

[Randall, Randy]

No so.  I had a RCA CTC-9 (Circa 1959-60) with a 21" round crt that used a ‎thermistor‎ in the transformer's primary and it did open up.  Not having a ‎replacement handy I just shorted the leads and powered on.  The set never made ‎a sound powering up before, but after there was a loud bummmmmmm when the ac ‎was applied.  This set did not have an automatic degaussing circuit.‎

Randy AB9GO ‎

-----Original Message-----
From: amps-bounces at contesting.com [mailto:amps-bounces at contesting.com] On Behalf Of Bill, W6WRT
Sent: Monday, March 01, 2010 8:17 PM
To: Alex Eban
Cc: 'Amplifier Reflector'
Subject: Re: [Amps] soft start, how to determine if needed?

ORIGINAL MESSAGE:

On Sun, 28 Feb 2010 09:58:56 +0200, "Alex Eban" <alexeban at gmail.com>
wrote:

>By the way, an old trick that was used in tube type TV sets was to install a
>thermistor in series with the mains.

REPLY:

That thermistor was not used for soft start. It was part of the
degaussing system and had very poor reliability. I changed hundreds of
them over the years. Not recommended.

73, Bill W6WRT
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