Tim, thanks for the info, I have tried this with a 2
cell flash but not with a 4 cell unit. Your reply
confirms what I thought would be ok to try, think I'll
stick with "C" cells for the first try and see how
they perform. John
--- HI100@xxxxxxx wrote:
> omrobison@xxxxxxxxx writes:
>
> << Hi All, I just purchased a vivitar 283 used
> and was
> wondering if any of the list members would know if
> I
> could power it with a 4C or 4D battery pack routed
> through a dummy battery holder. The voltage would
> still be 6v, but of course the amps would be
> higher. I
> wonder if this would be safe for the unit >>
>
> John,
> this should work just fine and is
> essentially what happens with the
> Quantum battery packs. Except they use lead acid
> batteries which can produce
> much higher current still. Check their
> website:http://www.qtm.com/
> You could even buy one of the Quantum
> battery cables and dummy cells
> designed specifically for your flash. (283,4600 etc
> needs MA2 or XA2). This
> connects with a coax connector which you should be
> able to get from Radio
> Shack. (You need the correct internal and external
> diameter connector, which
> vary for different voltage Quantum packs, but these
> are available.)
> With Lead acid cells it may be possible to
> cycle the charger rapidly
> enough that in sequence shooting you overheat the
> flash-tube/or transistors.
> Quantum actually has suggested rest time between
> shots for this reason. (see
> instruction manuals on website) With conventional
> Alkaline Leclanche cells
> this may be less likely since the recycle time will
> tend to be longer anyway.
> Interestingly the larger Alkaline cells
> often do not produce *much*
> higher current on the first few cycles but will be
> better over many cycles
> where the small cells become polarised quickly. The
> small inter electrode
> distance of the smaller cells keeps the initial
> current relatively high
> despite the smaller volume and plate area. Lead acid
> gel cells can produce
> large currents until they are largely depleted. This
> makes them more
> consistent in heavy use and is why the wedding
> photographers and other pro's
> etc like them.
> If you buy a Quantum cable/adapter and
> make your own battery box
> don't buy the "Turbo" cables by mistake, they are
> for high voltage use only.
>
> Regards,
> >>>Tim Hughes<<<
>
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