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Re: Expensive hobby

Original poster: "Paul B. Brodie" <pbbrodie@xxxxxxxxxxxxx>

Thanks for the info. How are you going about measuring the impedance of the primary? Do your MOT's have shunts? All of mine do. If so, are there just not enough to limit current like the NST's do? Thanks.
Think Positive

----- Original Message -----
From: "Tesla list" <<mailto:tesla@xxxxxxxxxx>tesla@xxxxxxxxxx>
To: <<mailto:tesla@xxxxxxxxxx>tesla@xxxxxxxxxx>
Sent: Thursday, April 21, 2005 1:56 PM
Subject: RE: Expensive hobby

> Original poster: "Mark Dunn" <<mailto:mdunn@xxxxxxxxxxxx>mdunn@xxxxxxxxxxxx>
> Paul:
> I have many MOT's. A number are marked 4000 Volt. They are not. All
> of my MOT's have a ratio between 16:1 and 20:1. Most of my MOT's have
> an impedence with the secondary shorted of about 3 to 4 Ohms. Thus they
> will pull 30 to 40 amps from 120 Volt mains with the secondary shorted
> -Don't try that. You test at 10 VAC with the secondary open I have done
> many times to verify ratio. Note you will be reading 160 to 200 VAC on
> the open secondary. Hook up meter before applying power so you avoid
> shock risk.
> Mark
> Original poster: "Paul B. Brodie" <<mailto:pbbrodie@xxxxxxxxxxxxx>pbbrodie@xxxxxxxxxxxxx>
> Mike,
> I doubt it because this MOT is substantially larger than the other coils
> and it has a lot more turns on the secondary. Also, the 4000 V is
> labeled
> right on the transformer with the manufacturer's data. Since the
> manufacturer doesn't know how the end user is going to wire the
> transformer, they wouldn't put the 4000 V assuming it is going to be
> driving a voltage doubler or anything else, for that matter.
> I'm curious, where did you get the 1650 vac figure? Almost everything
> I've
> read on this list and on countless web sites say that the majority of
> MOT's
> are 2000 vac and the heavy duty ones 4000 vac. I am going to drive them
> with my variac set to 10 vac and measure the output from the secondary.
> Then, I can extrapolate the output at 100 vac on the primary. Anyone
> have a
> better idea of determining the secondary voltage on MOT's??
> Paul
> Think Positive
> ----- Original Message -----
> From: "Tesla list" <<mailto:tesla@xxxxxxxxxx>tesla@xxxxxxxxxx>
> To: <<mailto:tesla@xxxxxxxxxx>tesla@xxxxxxxxxx>
> Sent: Wednesday, April 20, 2005 6:31 PM
> Subject: Re: Expensive hobby
> > Original poster: "Mike" <<mailto:mike.marcum@xxxxxxxxxxxx>mike.marcum@xxxxxxxxxxxx>
> >
> > Odds are the 4000v is dc after the 1650vac or so from the mot is
> rectified > and doubled under the load of the magnetron. > > Mike