|[AMRadio] Push-pull Triode HF PA layout question|
brett.gazdzinski at verizonbusiness.com
Mon Feb 6 22:14:22 EST 2006
I would say keep it symmetrical, you can get rid of any problems
with the input/output when you neutralize the circuit.
The push pull stuff is very forgiving.
> -----Original Message-----
> From: amradio-bounces at mailman.qth.net
> [mailto:amradio-bounces at mailman.qth.net] On Behalf Of ne1s
> Sent: Monday, February 06, 2006 3:31 PM
> To: AM Radio Reflector; glowbugs at piobaire.mines.uidaho.edu
> Subject: [AMRadio] Push-pull Triode HF PA layout question
> Hello all,
> I humbly request the experience-based advice of this esteemed group.
> I am working on a project, part of which involves completion of 1930s
> Push-pull trode PA deck for 80M - 10M. Notice I said
> "completion," not
> "construction." This deck already has the plate tank components, tube
> sockets, and neutralizing capacitors mounted on a beautifull
> chassis & panel. The axis bisecting the holes for the tubes
> is parallel to
> the front panel, the plate tank air variable (split stator)
> is perpendicular
> to the front panel, and the plate tank coil (plug-in jack-bar style -
> actually I'll be using BC-610 coils, link-coupled to the antenna) is
> centered directly behind the plate tank capacitor, with its
> axis parallel to
> the front panel. What this deck lacks is a grid tank circuit,
> which I need
> to add. The tubes will be 812s or T-55s, and will be
> plate-modulated for 250
> - 300W output.
> What is the worse sin: lack of physical symmetry, or proximity of the
> gazinta to the gizouta? It seems that I'll have to compromize
> one or the
> other in adding the grid tank circuit, based on the present
> layout. The grid
> tank will be link-coupled to the exciter.
> Thanks for your assistance,
> AMRadio mailing list
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