[Amps] 813 efficiency
Carl
km1h at jeremy.mv.com
Tue Feb 26 14:09:10 EST 2013
Mount 4 up and 4 hanging down. Feed the cathodes thru a 2 port splitter and
200W+ drive.
10-4 and Yee Haw
Carl
KM1H
----- Original Message -----
From: "Robert Groh" <rgroh at swbell.net>
To: "k7fm" <k7fm at teleport.com>; "Amps" <amps at contesting.com>
Sent: Monday, February 25, 2013 1:12 PM
Subject: Re: [Amps] 813 efficiency
> Love your comments, Colin. I visualize a 'ring' of 813's (like the
> cylinders of
> an old radial airplane engine) - bases all toward the center. All behind a
> big
> window (you just have to be able to see the plates glowing red as you
> throw the
> RF to them). No, maybe a better idea to flip the tubes end-for-end
> (better to
> combine the RF outputs). Cooling - maybe a big fan (box fan??) directly
> behind
> the tubes and pull the hot air out radially. Actually maybe set up for 13
> tubes
> but the 13th tube position doesn't have a tube there - this is just a
> place to
> have the tuning controls coming out. Crazy? Maybe. Great idea for the
> April
> 2014 issue of QST. Wow. I've got to work on that.
>
> 73
> Bob, WA2CKY
>
>
>
>
> ________________________________
> From: k7fm <k7fm at teleport.com>
> To: Bill Turner <dezrat1242 at yahoo.com>; Amps <amps at contesting.com>
> Sent: Mon, February 25, 2013 8:58:54 AM
> Subject: Re: [Amps] 813 efficiency
>
> REPLY:
> To get the plate dissipation of a single 8877 would take 12 813s.
>
> Would you put them all in a row? Or a matrix of 3x4? Or 6x2?
> Or maybe in a circle? Can't wait to hear. :-)
>
> Good question. With 12, you could place them like a clock face, then be
> able to
> identify the bad tube by the time - except that the modern folks may not
> be able
> to read a clock face. To a digital guy, 12 o'clock high means having a
> joint
> with lunch.
>
> 73, Colin K7FM
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