[Amps] Step start, is it needed ?

[Bill, W6WRT]

ORIGINAL MESSAGE:

On Tue, 23 Feb 2010 22:08:15 -0800, "Jim Thomson" <Jim.thom at telus.net>
wrote:

>
>The SB-1000 does not require a step-start. The transformer is designed so that the 
>secondaries have enough impedance to protect the diodes and tube filament at startup. It 
>also has a relay to protect the switch (at least mine, which is a late model, does).

REPLY:

My SB-1000 had a terrible "thump" at turn on. The thump was actually
the cabinet, which is steel. Electrically, it was probably not an
issue, but I installed a step-start circuit to keep peace in the
shack.  :-)

73, Bill W6WRT