[Amps] 813 efficiency

[Robert Groh]

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