From: David Gow<6146guy@gmail.com>
Subject: Re: [Amps] Harbach SB-220 Soft Start Relay Part # or
replacement
Message-ID:
<CA+1A67SRN6bm2QFffKshYnsyyvcC1CQiQu4QCamCL+f94zb8KA@mail.gmail.com>
Content-Type: text/plain; charset="UTF-8"
Pull it all out, as has been well documented there is no need for a soft
start mod for th SB-220, it is built into the transformer. You are only
protecting the switch and an outlet strip will do that.
I thoroughly agree, I removed from mine soon after receiving. I also connected
the
Filament transformer primaries directly together bypassing the shared HV
primary ssb/cw switching to protect
against switch fault or HV primary failure also taking out the filament
transformer primary, by overloading
one side in such a fault.
It seems the soft start idea was more that most did not know the real reason
for the 3-500z grid/filament shorts sometimes discovered,
and put it down to filament start current, which when tested is only 60% of
Eimac max recommendation.
73
vk4tux
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