Date: Wed, 27 Dec 2017 13:03:08 -0500
From: "WK1W-Ivan Shapiro" <WK1W@ivanshapiro.com>
To: <amps@contesting.com>
Subject: [Amps] How about INRUSH CURRENT PROTECTOR
<I followed WA8SAJ's advice for protection.
All my tube rigs "see" a 110/120 INRUSH CURRENT PROTECTOR made by Ameritron.
That is fed by a variac, also suggested by WA8SAJ.
My L4B, though it has step-start, it "sees" a 220/240 ICP from Ameritron.
The latter might be overkill, but is insurance.
73 Ivan Shapiro WK1W
## The outboard, external ameritron inrush current protector IS a step start
circuit, uses the same resistor + relay to
shunt the resistor. Only difference is its in an external box, used on amps
that never came with step start.
## Be careful when using a variac to control the main 240 vac going Into a kw
tube amp. If its not sized big enough,
it can easily harm the dynamic regulation of the B+ supply. The peak current
every 8.3 msecs through the diode board
is huge, a lot higher than your plate current.
## and be careful if using a 240 vac variac to feed an amp like a SB-220,
L4B, ameritron etc. Lower the b+,
and you will also have lowered the fil V !!
## On my hb amps, I use a variac to control the fil V only, not the B+ supply.
Jim VE7RF
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