[ARC5] 12 V Power pentode.

[Dennis Monticelli]

I like wise love the 6AG7.

Ken:  I know there isn't room for an 837 but maybe in one direction there
is room for two 6AG7s stuffed into an in-line adapter that wires the
filaments in series and the electrodes in parallel.

Dennis AE6C

On Sun, Apr 10, 2016 at 5:12 PM, D C _Mac_ Macdonald <k2gkk at hotmail.com>
wrote:

> The 6AG7 is truly a great one.  Is there a 6 Volt version with same
> filament draw as the 6AG7 that could substitute for one of the 12V tubes to
> follow the 6AG7??
>
> 73 - Mac, K2GKK in OKC
>
> Sent from my iPad
>
> > On Apr 10, 2016, at 18:22, Kenneth G. Gordon <kgordon2006 at frontier.com>
> wrote:
> >
> > On 10 Apr 2016 at 15:27, Arden Allen wrote:
> >
> >>> Does anyone here know of a power-pentode, which is 1) not a beam-tube,
> 2)
> >>> has a 12.6 V filament, and 3) might have an octal base?
> >>
> >> Two tubes immediately come to mind, Dave.  The 12V6 and the 12A6.  But
> both
> >> are beam tubes.  So what's the matter with a beam tube for your
> application?
> >
> > It wasn't David who needed it, Arden: it was I.
> >
> > And I want such a tube for an ECO VFO in a rig in which all the other
> tubes have a 12 V
> > filament. Also, I am just plain curious if there ever was one.
> >
> > Beam-tubes do not make very effective ECOs because their construction
> defeats the
> > entire purpose of an ECO.
> >
> > In addition, in most cases, what is shown on the tube-base diagram as
> being a
> > screen-grid, is in fact a pair of "beam-forming" plates,
> >
> > Trying to use such a tube as an ECO results in the oscilator energy
> being coupled
> > around the "screen" directly to the plate.
> >
> > In an ECO, the screen grid is supposed to be the "plate" of the
> oscillator.
> >
> > As I remember it, the ECO also requires a tube with a suppressor grid,
> so tetrodes don't
> > make good ECOs either: not enough isolation between the
> oscillator-section and the
> > amplifier-section of the tube.
> >
> > The 6AG7 makes a superb ECO tube, but there isn't a 12AG7. The 12BY7 is
> also
> > excellent in this regard, but it is a 9-pin miniature. Although I could
> make an adapter for
> > this one, I would rather not.
> >
> > Ken W7EKB
> > ______________________________________________________________
> > ARC5 mailing list
> > Home: http://mailman.qth.net/mailman/listinfo/arc5
> > Help: http://mailman.qth.net/mmfaq.htm
> > Post: mailto:ARC5 at mailman.qth.net
> >
> > This list hosted by: http://www.qsl.net
> > Please help support this email list: http://www.qsl.net/donate.html
> ______________________________________________________________
> ARC5 mailing list
> Home: http://mailman.qth.net/mailman/listinfo/arc5
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:ARC5 at mailman.qth.net
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mailman.qth.net/pipermail/arc5/attachments/20160410/9b1c6699/attachment-0001.html>