Well, yes you would need a bulb in each side of the 220 circuit or two bulbs
in series (rather than parallel) on one side,
assuming that the amp is not a 4 wire amp that also uses 120 volts.
If something in the amp shorts you would have 220 volts across a single bulb
and the bulb would burn out.
73
Gary K4FMX
> -----Original Message-----
> From: Amps [mailto:amps-bounces@contesting.com] On Behalf Of Joe
> Sent: Monday, July 10, 2017 9:26 AM
> To: amps@contesting.com
> Subject: Re: [Amps] SB220 step start blows fuses
>
> If you were to use this light bulb current limiter safety thing, but on
> a 220 variac, I assume you would have to put a light into each leg true?
>
> Joe WB9SBD
> Sig
> The Original Rolling Ball Clock
> Idle Tyme
> Idle-Tyme.com
> http://www.idle-tyme.com
> On 7/10/2017 7:50 AM, donroden@hiwaay.net wrote:
> > Agree with Gary !!
> >
> > Make a tester out of a garage light with a 300 or 500 watt halogen
> > element.
> > ( or pair ) relatively inexpensive and I always need an extra light
> > when looking for things in my garage.
> >
> > Don W4DNR
> >
> >
> >
> > Quoting Gary Schafer <garyschafer@largeriver.net>:
> >
> >> You don't have a big enough bulb.
> >>
> >> I use two 300 watt bulbs in parallel. 300 watt bulbs are about the
> >> largest
> >> you can find easily.
> >>
> >> I made up the bulb unit using a square electrical box and mounted two
> >> outdoor light sockets on it, an outlet and a regular house switch to
> >> short
> >> out the bulbs when I want to bypass the series bulbs.
> >> It works great for checking amps. It is really nice if you have an
> >> intermittent arc or want to let suspect capacitors cook for awhile
> >> with the
> >> amp is in standby as no harm is done if something arcs, the bulbs
> >> just light
> >> up bright.
> >>
> >> I sometimes plug the light bulb setup into a variac too.
> >>
> >> 73
> >>
> >> Gary K4FMX
> >>
> >>> -----Original Message-----
> >>> From: Amps [mailto:amps-bounces@contesting.com] On Behalf Of Warren
> >>> Volz
> >>> Sent: Sunday, July 09, 2017 9:53 PM
> >>> To: amps; gudguyham@aol.com
> >>> Subject: Re: [Amps] SB220 step start blows fuses
> >>>
> >>> I may shortly be looking to purchase a variac.
> >>>
> >>> After building a dim bulb tester this weekend I have a minor update.
> >>>
> >>> With 120V connected, the HV primary disconnected and one tube in a
> >>> socket (doesn't matter which I use) the 100W bulb in my tester
> >>> lights up
> >>> bright. No fan and the meter lights aren't on. If I take out the
> tube
> >>> the fan and meter lights work. So I guess I have a shorted tube?
> Would
> >>> it be good to double check the DC/AC voltage on the filament supply
> >>> with
> >>> the tubes plugged in? That would show any sags that might exist.
> >>>
> >>> -Warren
> >>>
> >>> > On Jul 7, 2017, at 12:58 PM, gudguyham--- via Amps
> >>> <amps@contesting.com> wrote:
> >>> >
> >>> > I know I sound like a broken record but yes, a Variac is the way
> to
> >>> go. Especially with amps that can have power supply problems and
> gassy
> >>> tubes. You will hear the plate transformer groan and won't see HV
> >>> climbing on the meter if there is a problem in the PS long before
> the
> >>> smoke Genie appears. My Variac gets used daily several times after
> >>> doing ANY work on an amp. It's saved me loads of time fixing blown
> >>> parts that would normally occur if I had just turned an amp on with
> >>> problems. Best investment I ever made. 0-250 volts at 20 amps.
> >>> >
> >>> > Sent from AOL Mobile Mail
> >>> >
> >>> >
> >>> > -----Original Message-----
> >>> > From: Bill Turner <dezrat@outlook.com>
> >>> > To: Amps group <amps@contesting.com>
> >>> > Sent: Fri, Jul 7, 2017 12:34 PM
> >>> > Subject: Re: [Amps] SB220 step start blows fuses
> >>> >
> >>> >
> >>> > ------------ ORIGINAL MESSAGE ------------(may be snipped)
> >>> >
> >>> > On Fri, 7 Jul 2017 10:21:36 -0400, Mark B. wrote:
> >>> >
> >>> >> A variac varies voltage. It is not designed to limit current.
> >>> >
> >>> > REPLY:
> >>> >
> >>> > At the very low end of its range, a Variac limits current just
> >>> fine. I
> >>> > worked as a calibration technician at Tektronix for years, taking
> >>> > brand new scopes off the assembly line and powering them up for
> the
> >>> > first time. Believe me, a Variac is the only way to go with a unit
> >>> > which could have any number of problems at first. Over the years I
> >>> > powered up literally thousands of scopes this way and never a
> problem
> >>> > with current limiting.
> >>> >
> >>> > 73, Bill W6WRT
> >>> > _______________________________________________
> >>> > Amps mailing list
> >>> > <a href="mailto:Amps@contesting.com";>Amps@contesting.com</a>
> >>> > <a href="http://lists.contesting.com/mailman/listinfo/amps";
> >>>
> target="_blank">http://lists.contesting.com/mailman/listinfo/amps</a>
> >>> > _______________________________________________
> >>> > Amps mailing list
> >>> > Amps@contesting.com
> >>> > http://lists.contesting.com/mailman/listinfo/amps
> >>>
> >>> _______________________________________________
> >>> Amps mailing list
> >>> Amps@contesting.com
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> >>
> >> _______________________________________________
> >> Amps mailing list
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> >
> >
> >
> > DonR
> > _______________________________________________
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> >
> >
> >
>
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