-----Original Message-----
From: Tom Rauch <w8ji@contesting.com>
To: Ian White, G3SEK <G3SEK@ifwtech.co.uk>; amps@contesting.com
<amps@contesting.com>
To: <amps@contesting.com>
Date: 06 May 2002 19:28
Subject: Re: [Amps] Rectifier diode strings
big snip
> > However, that argument cannot hold up forever as the spikes get
>> longer, and turn into voltage "surges" that last for more than one
>> mains cycle. It only takes a couple of half-cycles at a new, higher
>> primary voltage to pump the capacitor up to the new rectified DC
>> voltage (within a few percent)
>
>The MOV won't do much good when it explodes from the dissipation.
>Fortunately the transformer of any amplifier beyond sissy-class will
>generally be large enough to protect the thin-lead frail MOV from
>damage.
If you employ step start, then the line fuse can be fast blow, and rated
just above maximum expected current. Will a reasonable size MOV survive long
enough to take out the fuse?
Steve
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