[AMRadio] Push-pull Triode HF PA layout question


Brett gazdzinski 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.

Brett
N2DTS 

> -----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. 
> 
> Background:
> 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 
> black-wrinkle 
> 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. 
> 
> Question:
> 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, 
> 
>  -Larry/NE1S
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