[ARC5] Heater voltage split in "command" receivers

[Ian Wilson]

Why spend thousands of dollars on tubes with matched filament
strings when the Filament Temperature Levelizer (tm) is available?

The FTL is a robust two-terminal device that is readily attached to
one of a pair of series-filament-string audio tubes. A precision
adjustment device is provided to guarantee accurate balance and
ensures retention of unmuddied highs.

The FTL is available in trial packs of two for a limited period at the
unrepeatable price of $575 per pack. Limit two per customer. An
enhanced version with gold-plated legs will be available later this year.

73, ian K3IMW


On Fri, Jan 25, 2013 at 4:43 AM, Mike Hanz <aaf-radio-1 at aafradio.org> wrote:

> Sounds like a perfect opportunity for those audio guys who sell matched
> pairs...getchur matched filament strings here!  More transparent white
> noise guaranteed!  Hear everything you're missing with existing poorly
> matched filament voltages!  :-)
>
> On Jan 25, 2013, at 5:13 AM, Leslie Smith <vk2bcu at operamail.com> wrote:
>
> > Yes, Ken, I did the same, and made the same observation.
> > The heater resistances are unequal.
> >
> >
> >
> >  Les
> >  vk2bcu at operamail.com
> >
> >
> > On Fri, Jan 25, 2013, at 3:21, Kenneth G. Gordon wrote:
> >> On 24 Jan 2013 at 1:17, WA5CAB at cs.com wrote:
> >
> >> Just to check (and because I am intensely curious about most things), I
>  took
> >> the time to measure the AC filament voltage at each tube socket: in no
>  case
> >> whatever was the 24 VAC source evenly-divided across any two sets of
> >> seriesed tubes: it would be 11 volts on one tube and 13 volts on its
>  partner,
> >> or 11.5 V on one and 12.5 on its partner, etc.
> >>
> >> I found that interesting, but not particularly important.
> >>
> >> Ken W7EKB
> >
> > --
> > http://www.fastmail.fm - Or how I learned to stop worrying and
> >                          love email again
> >
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