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Re: very basic tube questions--twin triode, "mu" rating; heptode

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hancock4@bbs.cpcn.com wrote:
>In reading C&A, I found an ad by Sylvania with specs for
>various tubes.  Knowing extremely little tubes, could
>someone expand a little bit on the following...
>
>1) What is a "twin", as in the difference between a 5844
>triode and a 5965 _twin_ triode?  How would they be
>used?

That describes two units built into one envelope.

The 5844 is a twin triode with a 7 pin base, where both of the
triodes share a common cathode.  The specifications suggest it
would be useful for a DC switching function.

The 5965 is a twin triode with a 9 pin base, where the two
triode have separate cathodes.  It has a higher mu (gain), but
in several ways is similar to the above 5844.

>2) What does "mu" mean, as in 6211 Medium mu twin
>triode, and 5687 Low mu twin triad?  How would they be
>used?

Essentially mu is the gain.  It is the change in plate current
divided by the change in grid voltage that caused the change.
Higher values are useful for higher gain applications, while
lower values are useful for switching applications (or higher
output for power amplifiers).  Note also that higher gain would
usually mean shorter life and less stable operation.

Tubes varied significantly between manufacturers, between batches
off the same production line, and with age.  With circuits where
manual adjustment was not desired, it was not uncommon to stick with
one manufacturer, to "burn in" tubes for at least 48 hours, and then
to hand pick tubes within a given mu range.

-- 
Floyd L. Davidson                         http://www.apaflo.com/
Ukpeagvik (Barrow, Alaska)                      floyd@apaflo.com

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very basic tube questions--twin triode, "mu" rating; heptode hancock4@bbs.cpcn.com - 2015-08-25 13:24 -0700
  Re: very basic tube questions--twin triode, "mu" rating; heptode floyd@apaflo.com (Floyd L. Davidson) - 2015-08-25 13:35 -0800
  Re: very basic tube questions--twin triode, "mu" rating; heptode David Wade <dave.g4ugm@gmail.com> - 2015-08-25 23:19 +0100
  Re: very basic tube questions--twin triode, "mu" rating; heptode "Osmium" <r124c4u102@comcast.net> - 2015-08-25 17:36 -0500
  Re: very basic tube questions--twin triode, "mu" rating; heptode "Joe Morris" <j.c.morris@verizon.net> - 2015-08-25 19:41 -0400
    Re: very basic tube questions--twin triode, "mu" rating; heptode tracymnelson@gmail.com - 2015-10-26 09:16 -0700
      Re: very basic tube questions--twin triode, "mu" rating; heptode Quadibloc <jsavard@ecn.ab.ca> - 2015-10-26 09:47 -0700
        Re: very basic tube questions--twin triode, "mu" rating; heptode hancock4@bbs.cpcn.com - 2015-10-26 10:00 -0700
          Re: very basic tube questions--twin triode, "mu" rating; heptode Charlie Gibbs <cgibbs@kltpzyxm.invalid> - 2015-10-26 21:18 +0000
            Re: very basic tube questions--twin triode, "mu" rating; heptode Michael Black <et472@ncf.ca> - 2015-10-26 17:37 -0400
              Re: very basic tube questions--twin triode, "mu" rating; heptode Charlie Gibbs <cgibbs@kltpzyxm.invalid> - 2015-10-27 19:55 +0000
            Re: very basic tube questions--twin triode, "mu" rating; heptode Walter Banks <walter@bytecraft.com> - 2015-10-27 08:31 -0400
            Re: very basic tube questions--twin triode, "mu" rating; heptode "Charles Richmond" <numerist@aquaporin4.com> - 2015-10-27 14:41 -0500
              Re: very basic tube questions--twin triode, "mu" rating; heptode Charlie Gibbs <cgibbs@kltpzyxm.invalid> - 2015-10-27 20:17 +0000
                Re: very basic tube questions--twin triode, "mu" rating; heptode Jon Elson <jmelson@wustl.edu> - 2015-10-28 15:59 -0500
                Re: very basic tube questions--twin triode, "mu" rating; heptode hancock4@bbs.cpcn.com - 2015-10-28 19:01 -0700
                Re: very basic tube questions--twin triode, "mu" rating; heptode Jon Elson <jmelson@wustl.edu> - 2015-10-29 13:46 -0500
                Re: very basic tube questions--twin triode, "mu" rating; heptode Charlie Gibbs <cgibbs@kltpzyxm.invalid> - 2015-10-29 19:37 +0000
          Re: very basic tube questions--twin triode, "mu" rating; heptode Jon Elson <elson@pico-systems.com> - 2015-10-26 21:00 -0500
            Re: very basic tube questions--twin triode, "mu" rating; heptode Quadibloc <jsavard@ecn.ab.ca> - 2015-10-26 19:41 -0700
              Re: very basic tube questions--twin triode, "mu" rating; heptode hancock4@bbs.cpcn.com - 2015-10-27 07:28 -0700
                Re: very basic tube questions--twin triode, "mu" rating; heptode Quadibloc <jsavard@ecn.ab.ca> - 2015-10-27 12:47 -0700
                Re: very basic tube questions--twin triode, "mu" rating; heptode Charlie Gibbs <cgibbs@kltpzyxm.invalid> - 2015-10-27 20:17 +0000
              Re: very basic tube questions--twin triode, "mu" rating; heptode David Wade <dave.g4ugm@gmail.com> - 2015-10-27 23:02 +0000
                Re: very basic tube questions--twin triode, "mu" rating; heptode Ahem A Rivet's Shot <steveo@eircom.net> - 2015-10-28 09:38 +0000
                Re: very basic tube questions--twin triode, "mu" rating; heptode hancock4@bbs.cpcn.com - 2015-10-28 07:47 -0700
                Re: very basic tube questions--twin triode, "mu" rating; heptode Ahem A Rivet's Shot <steveo@eircom.net> - 2015-10-28 19:24 +0000
                Re: very basic tube questions--twin triode, "mu" rating; heptode hancock4@bbs.cpcn.com - 2015-10-28 13:42 -0700
                Re: very basic tube questions--twin triode, "mu" rating; heptode David Wade <dave.g4ugm@gmail.com> - 2015-10-30 15:57 +0000
                Re: very basic tube questions--twin triode, "mu" rating; heptode David Wade <dave.g4ugm@gmail.com> - 2015-10-30 15:54 +0000
                Re: very basic tube questions--twin triode, "mu" rating; heptode Ahem A Rivet's Shot <steveo@eircom.net> - 2015-10-30 18:44 +0000
            Re: very basic tube questions--twin triode, "mu" rating; heptode "Charles Richmond" <numerist@aquaporin4.com> - 2015-10-27 15:19 -0500
              Re: very basic tube questions--twin triode, "mu" rating; heptode Jon Elson <elson@pico-systems.com> - 2015-10-27 18:58 -0500
                Re: very basic tube questions--twin triode, "mu" rating; heptode Quadibloc <jsavard@ecn.ab.ca> - 2015-10-27 17:57 -0700
                Re: very basic tube questions--twin triode, "mu" rating; heptode Quadibloc <jsavard@ecn.ab.ca> - 2015-10-27 17:59 -0700
                Re: very basic tube questions--twin triode, "mu" rating; heptode hancock4@bbs.cpcn.com - 2015-10-27 18:26 -0700
                Re: very basic tube questions--twin triode, "mu" rating; heptode "Charles Richmond" <numerist@aquaporin4.com> - 2015-10-28 14:57 -0500
                Re: very basic tube questions--twin triode, "mu" rating; heptode "Osmium" <r124c4u102@comcast.net> - 2015-10-28 14:09 -0600
                Re: very basic tube questions--twin triode, "mu" rating; heptode Jon Elson <jmelson@wustl.edu> - 2015-10-28 15:52 -0500
                Re: very basic tube questions--twin triode, "mu" rating; heptode Jon Elson <jmelson@wustl.edu> - 2015-10-28 15:46 -0500
                Re: very basic tube questions--twin triode, "mu" rating; heptode Charlie Gibbs <cgibbs@kltpzyxm.invalid> - 2015-10-28 21:09 +0000
                Re: very basic tube questions--twin triode, "mu" rating; heptode Jon Elson <jmelson@wustl.edu> - 2015-10-28 15:38 -0500
                Re: very basic tube questions--twin triode, "mu" rating; heptode Peter Flass <peter_flass@yahoo.com> - 2015-10-28 06:06 -0400
              Re: very basic tube questions--twin triode, "mu" rating; heptode Charlie Gibbs <cgibbs@kltpzyxm.invalid> - 2015-10-28 01:22 +0000
                Re: very basic tube questions--twin triode, "mu" rating; heptode "Charles Richmond" <numerist@aquaporin4.com> - 2015-10-28 15:22 -0500
                Re: very basic tube questions--twin triode, "mu" rating; heptode hancock4@bbs.cpcn.com - 2015-10-28 13:49 -0700
                Re: very basic tube questions--twin triode, "mu" rating; heptode Quadibloc <jsavard@ecn.ab.ca> - 2015-10-28 15:51 -0700
                Re: very basic tube questions--twin triode, "mu" rating; heptode hancock4@bbs.cpcn.com - 2015-10-28 19:28 -0700
                Re: very basic tube questions--twin triode, "mu" rating; heptode Charlie Gibbs <cgibbs@kltpzyxm.invalid> - 2015-10-28 21:34 +0000
                Re: very basic tube questions--twin triode, "mu" rating; heptode Ibmekon <Ibmekon> - 2015-10-28 22:11 +0000
                Re: very basic tube questions--twin triode, "mu" rating; heptode David Wade <dave.g4ugm@gmail.com> - 2015-10-30 15:59 +0000
                Re: very basic tube questions--twin triode, "mu" rating; heptode scott@slp53.sl.home (Scott Lurndal) - 2015-10-30 16:31 +0000
                Re: very basic tube questions--twin triode, "mu" rating; heptode hancock4@bbs.cpcn.com - 2015-10-30 20:07 -0700
                Re: very basic tube questions--twin triode, "mu" rating; heptode "Osmium" <r124c4u102@comcast.net> - 2015-10-31 03:57 -0600
                Re: very basic tube questions--twin triode, "mu" rating; heptode Ahem A Rivet's Shot <steveo@eircom.net> - 2015-10-31 10:20 +0000
                Re: very basic tube questions--twin triode, "mu" rating; heptode "Osmium" <r124c4u102@comcast.net> - 2015-10-31 04:51 -0600
                Re: very basic tube questions--twin triode, "mu" rating; heptode Peter Flass <peter_flass@yahoo.com> - 2015-10-31 07:08 -0400
                Re: very basic tube questions--twin triode, "mu" rating; heptode Ahem A Rivet's Shot <steveo@eircom.net> - 2015-10-31 12:29 +0000
                Re: very basic tube questions--twin triode, "mu" rating; heptode David Hume <David.Hume@example.com> - 2015-10-31 12:04 +0000
                Re: very basic tube questions--twin triode, "mu" rating; heptode "Osmium" <r124c4u102@comcast.net> - 2015-10-31 06:11 -0600
                Re: very basic tube questions--twin triode, "mu" rating; heptode David Hume <David.Hume@example.com> - 2015-10-31 12:37 +0000
                Re: very basic tube questions--twin triode, "mu" rating; heptode Ahem A Rivet's Shot <steveo@eircom.net> - 2015-10-31 13:20 +0000
                Re: very basic tube questions--twin triode, "mu" rating; heptode David Wade <dave.g4ugm@gmail.com> - 2015-11-01 16:18 +0000
                Re: very basic tube questions--twin triode, "mu" rating; heptode "Osmium" <r124c4u102@comcast.net> - 2015-11-01 10:41 -0600
                Re: very basic tube questions--twin triode, "mu" rating; heptode Morten Reistad <first@last.name.invalid> - 2015-10-31 15:21 +0100
                Re: very basic tube questions--twin triode, "mu" rating; heptode "gareth" <no.spam@thank.you.invalid> - 2015-10-31 15:13 +0000
                Re: very basic tube questions--twin triode, "mu" rating; heptode Dave Garland <dave.garland@wizinfo.com> - 2015-10-31 12:49 -0500
                Re: very basic tube questions--twin triode, "mu" rating; heptode "Charles Richmond" <numerist@aquaporin4.com> - 2015-10-31 15:09 -0500
                Re: very basic tube questions--twin triode, "mu" rating; heptode Greymaus <mausg@mail.com> - 2015-11-01 12:04 +0000
                Re: very basic tube questions--twin triode, "mu" rating; heptode "Osmium" <r124c4u102@comcast.net> - 2015-11-01 07:48 -0600
                Re: very basic tube questions--twin triode, "mu" rating; heptode Huge <Huge@nowhere.much.invalid> - 2015-11-01 13:56 +0000
                Re: very basic tube questions--twin triode, "mu" rating; heptode Greymaus <mausg@mail.com> - 2015-11-01 18:33 +0000
                Re: very basic tube questions--twin triode, "mu" rating; heptode Charlie Gibbs <cgibbs@kltpzyxm.invalid> - 2015-11-02 17:17 +0000
                Re: very basic tube questions--twin triode, "mu" rating; heptode Ibmekon <Ibmekon> - 2015-10-31 11:30 +0000
                Re: very basic tube questions--twin triode, "mu" rating; heptode hancock4@bbs.cpcn.com - 2015-10-28 19:15 -0700
                Re: very basic tube questions--twin triode, "mu" rating; heptode Charlie Gibbs <cgibbs@kltpzyxm.invalid> - 2015-10-29 02:55 +0000
                Re: very basic tube questions--twin triode, "mu" rating; heptode hancock4@bbs.cpcn.com - 2015-10-29 07:36 -0700
                Re: very basic tube questions--twin triode, "mu" rating; heptode Charlie Gibbs <cgibbs@kltpzyxm.invalid> - 2015-10-29 17:19 +0000
                Re: very basic tube questions--twin triode, "mu" rating; heptode Lawrence Statton <lawrence@senguio.mx> - 2015-10-29 11:33 -0600
                Re: very basic tube questions--twin triode, "mu" rating; heptode Charlie Gibbs <cgibbs@kltpzyxm.invalid> - 2015-10-29 19:37 +0000
                Re: very basic tube questions--twin triode, "mu" rating; heptode Dave Garland <dave.garland@wizinfo.com> - 2015-10-29 18:03 -0500
                Re: very basic tube questions--twin triode, "mu" rating; heptode "Osmium" <r124c4u102@comcast.net> - 2015-10-29 11:44 -0600
                Re: very basic tube questions--twin triode, "mu" rating; heptode Charlie Gibbs <cgibbs@kltpzyxm.invalid> - 2015-10-29 19:37 +0000
                Re: very basic tube questions--twin triode, "mu" rating; heptode Michael Black <et472@ncf.ca> - 2015-10-29 16:03 -0400
                Re: very basic tube questions--twin triode, "mu" rating; heptode Lawrence Statton <lawrence@senguio.mx> - 2015-10-29 14:15 -0600
                Re: very basic tube questions--twin triode, "mu" rating; heptode Charlie Gibbs <cgibbs@kltpzyxm.invalid> - 2015-10-29 21:51 +0000
                Re: very basic tube questions--twin triode, "mu" rating; heptode Quadibloc <jsavard@ecn.ab.ca> - 2015-10-29 15:20 -0700
                Re: very basic tube questions--twin triode, "mu" rating; heptode Peter Flass <peter_flass@yahoo.com> - 2015-10-30 07:28 -0400
                Re: very basic tube questions--twin triode, "mu" rating; heptode "Charles Richmond" <numerist@aquaporin4.com> - 2015-10-30 14:57 -0500
                Re: very basic tube questions--twin triode, "mu" rating; heptode hancock4@bbs.cpcn.com - 2015-10-29 13:26 -0700
                Re: very basic tube questions--twin triode, "mu" rating; heptode Jon Elson <jmelson@wustl.edu> - 2015-10-29 15:40 -0500
                Re: very basic tube questions--twin triode, "mu" rating; heptode Quadibloc <jsavard@ecn.ab.ca> - 2015-10-29 15:32 -0700
                Re: very basic tube questions--twin triode, "mu" rating; heptode Charlie Gibbs <cgibbs@kltpzyxm.invalid> - 2015-10-29 23:10 +0000
                Re: very basic tube questions--twin triode, "mu" rating; heptode Quadibloc <jsavard@ecn.ab.ca> - 2015-10-29 19:09 -0700
                Re: very basic tube questions--twin triode, "mu" rating; heptode Charlie Gibbs <cgibbs@kltpzyxm.invalid> - 2015-10-30 16:35 +0000
                Re: very basic tube questions--twin triode, "mu" rating; heptode scott@slp53.sl.home (Scott Lurndal) - 2015-10-30 18:35 +0000
                Re: very basic tube questions--twin triode, "mu" rating; heptode Quadibloc <jsavard@ecn.ab.ca> - 2015-10-30 12:05 -0700
                Re: very basic tube questions--twin triode, "mu" rating; heptode Quadibloc <jsavard@ecn.ab.ca> - 2015-10-30 12:22 -0700
                Re: very basic tube questions--twin triode, "mu" rating; heptode scott@slp53.sl.home (Scott Lurndal) - 2015-11-02 14:15 +0000
                Re: very basic tube questions--twin triode, "mu" rating; heptode Walter Banks <walter@bytecraft.com> - 2015-10-30 17:31 -0400
                Re: very basic tube questions--twin triode, "mu" rating; heptode Walter Banks <walter@bytecraft.com> - 2015-10-30 17:44 -0400
                Re: very basic tube questions--twin triode, "mu" rating; heptode Michael Black <et472@ncf.ca> - 2015-10-30 23:38 -0400
                Re: very basic tube questions--twin triode, "mu" rating; heptode "Charles Richmond" <numerist@aquaporin4.com> - 2015-10-31 15:08 -0500
                Re: very basic tube questions--twin triode, "mu" rating; heptode Charlie Gibbs <cgibbs@kltpzyxm.invalid> - 2015-11-02 17:17 +0000
                Re: very basic tube questions--twin triode, "mu" rating; heptode Alfred Falk <falk@arc.ab.ca> - 2015-11-03 16:44 +0000
                Re: very basic tube questions--twin triode, "mu" rating; heptode Jon Elson <jmelson@wustl.edu> - 2015-11-05 15:28 -0600
                Re: very basic tube questions--twin triode, "mu" rating; heptode Walter Banks <walter@bytecraft.com> - 2015-11-05 17:05 -0500
          Re: very basic tube questions--twin triode, "mu" rating; heptode Morten Reistad <first@last.name.invalid> - 2015-10-26 22:12 +0100
  Re: very basic tube questions--twin triode, "mu" rating; heptode hancock4@bbs.cpcn.com - 2015-11-16 18:48 -0800
    Re: very basic tube questions--twin triode, "mu" rating; heptode Chris <xxx.syseng.yyy@gfsys.co.uk> - 2015-11-25 16:00 +0000
      Re: very basic tube questions--twin triode, "mu" rating; heptode hancock4@bbs.cpcn.com - 2015-11-30 09:43 -0800
        Re: very basic tube questions--twin triode, "mu" rating; heptode floyd@apaflo.com (Floyd L. Davidson) - 2015-11-30 10:42 -0900

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