On Apr 22, 9:41=A0am, John Byrns <byr...@[EMAIL PROTECTED]
> wrote:
> Your comment "one at 3A (a pair of EL34's)" suggests that you are
> contemplating running the EL34 heaters in parallel, this seems like a
> singularly bad idea to me. =A0Unless the heaters in both tubes are
> identical the current will divide unequally between the two heaters. =A0
> There is also no guarantee that you will get 6.3 volts across the
> heaters, so the heaters will likely not be operating at either rated
> voltage or current. =A0If I were using current regulation I would
connect
> the two heaters in series so that I would be guaranteed that the heaters
> would operate at their rated current.
Are you sure?
Parallel devices see the same voltage along the entire circuit, don't
they? Like ties on a railroad track? I am thinking of the dozens of
lamps in our house, each one "dividing" current unequally between the
heaters (filaments)... and they are not hardly identical.
Now, series devices may see problems depending on the nature of the
two (or more) devices in the string?
Peter Wieck
Melrose Park, PA
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