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Re: [Amps] SB220 step start blows fuses

Subject: Re: [Amps] SB220 step start blows fuses
From: Joe <>
Date: Sun, 23 Jul 2017 17:47:42 -0500
List-post: <>

On 7/23/2017 4:23 PM, Geert Jan de Groot wrote:
Sorry for raking up an older topic; I don't always have time
to keep up with mail.
If the thing is wired for 220V, and instead of powering with 220V
one powers with 5V AC in the primary, then the secondary circuit
works except that instead of messing with 2000V, one now works with
50V on the HV circuit. That is plenty to test diodes, measure caps etc,
and it's a while lot less nerving.

One has to realize that the filaments of the tubes will represent
a dead short (5V, 15A when in operation; cold resistance is less)
but I found this to be a lot less nerve wrecking and a lot safer
than trying to put line voltage on, with or without lamp,
with or without variac
So what is happening with the tube power supply? When running with this minuscule voltage?


73, Geert Jan PE1HZG

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