Re: Latest magnifier results (variac)
Subject: Re: Latest magnifier results
Date: Mon, 10 Mar 1997 19:05:41 +0000
From: "Bert Pool" <bertpool-at-flash-dot-net>
To: Tesla List <tesla-at-pupman-dot-com>
> > Subject: Latest magnifier results
> > Date: Sun, 8 Jun 1997 09:15:37 +0000
> > From: "Bert Pool" <bertpool-at-flash-dot-net>
> > To: Tesla List <tesla-at-pupman-dot-com>, jgore-at-onramp-dot-net
> > CC: bemery-at-why-dot-net
> > Our variac stcak suffered a very violent demise, complete with
> > fireball and acrid smoke. We crawled into the power cabinet and
> > bypassed the variac so we were running directly off the contactors.
> > "Variac? What variac? We don't need no stinking variac!" Instant
> > on, instant off. Worked great. We tripped our 60 amp circuit
> > breaker countless times, usually when the output spark hit the
> > transmission line and triggered a safety gap firing.
> Sure sounds like you had one great night! Super job on the neat sparks,
> you must have had the neighbors pretty impressed. The big sparks do
> tend to make peoples jaws drop abit, especially when they are coming
> from an individuals drive-way!
> Sorry to hear about the smoking variac stack, what size were they? I'm
> just wondering if you were really pushing them or was it something else
> that caused the unexpected failure. I had enough smoke already this
> month so I just hope to learn from your test too! Actually, sounds like
> you might have won the smoke contest for this week! (feeble attempt at
> humor). Great job, I am really interested in your next report. I'm
> still trying to get enough time to repair my coil, not yet done.
> Chuck Curran
We are/were running two 115 volt, 30 amp variacs wired for 220 volt
operation. Since we kept kicking out a 60 amp breaker, one might
say we were over-driving them a tad bit, but who doesn't? I suspect
the brushes have toasted, and they are likely repairable. I have
repaired one other variac using the Richard Hull video guide and it
is still good, so maybe we'll be lucky with these as well.