Fw: [AMPS] How to build the ultimate HF amplifier ?

[bob alexander]

doshhan wrote:
> 
> > ADDED TOPIC
> > Why not use two PI-networks? One for, let's say 6-10-15-20m and the other one
> > for the 40-80-160m bands? Switched with a vaccum relay.
> > Of course more parts and more space, but alot easier to handle the few C1-C2
> > pF's
> > needed for 6 and 10m, and the many pF's needed for 80 and 160m.
> >
> > I think the really ultimate home brew amp would have different PI-tanks for
> > each
> > band arranged around the tube. (If size isn't a BIG matter)
> > One tube with 7 PI-tanks, each one tuned to your favourite QRG on the band,
> > switched
> 
> I have an old QST article (maybe it was HRM) from the 70's called 'The Ecology Linear amplifier' where the author did just what you're thinking about.  A single 4-1000 feeding 5 or 6 separate Pi tanks.  He used some weird scheme with a telephone dial to switch the tanks in and out as he changed bands.
> 
> Phil T
> VE3OZZ
------

Why not switch in fixed values of C in place of a plate tuning 
cap and use a roller inductor for the "plate tune".
Come to think of it, Henry radio did that a decade or two ago.
73, Bob, W5AH

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