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@swbell.net>
To: "k7fm" <k7fm@teleport.com>; "Amps" <amps@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@teleport.com>
To: Bill Turner <dezrat1242@yahoo.com>; Amps <amps@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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