[Amps] Question on an amp.

[Will Matney]

Bill,

That's the way I figured it. The one with all the tubes can be designed and built, 
but the other is much easier to design and build. There's another way on this
where the three drivers are ran grid driven, and the eight finals are G-G. I would
think though that designing one with a couple of 3-500Z's, etc would be much
easier to design and build, even if its band is 160 to 10 meters. The one in question
really wasn't per say G-G (all grids tied directly to ground). The eight finals have 
bias on the control grids, and some screen voltage applied but are cathode driven. 
The drivers and pre-driver were similar. That makes for a complicated design. In
other words, to do it you better have all your ducks in a row, and know what your
doing or you'll end up with a mess that don't work.

Best,

Will

*********** REPLY SEPARATOR  ***********

On 7/31/06 at 11:51 PM Bill L. Fuqua wrote:

>That is why you may consider a grid-driven AB1 tetrode for the  final or
>maybe for the driver, so that you can get lots of gain in one stage or two
>if you insist that the output be grounded grid.
>
>73
>Bill wa4lav
>
>
>-----Original Message-----
>From: "Will Matney" <craxd1 at verizon.net>
>To: amps at contesting.com
>Date: Mon, 31 Jul 2006 13:34:44 -0400
>Subject: [Amps] Question on an amp.
>
>All,
>
>How hard would it be to build a multi-stage amp using sweep tubes? This
>would need four tuned circuits including the input tune. It would have a
>pre-driver, driver, and final set of tubes (1 driving 3 driving 8). Would
>this be a lot harder to design and build than using a couple of 3-500Z's
>or 4CX800's, etc even if it's a monoband? From looking at a project on the
>net, I'm just wondering on this.
>
>Thanks,
>
>Will
>
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