Hello,
Status of the Pi-L in the amp.
The L2 toroid was replaced by an air core coil and the Pi-L can be
adjusted to for a SWR of ~ 1 to 1 at 50 Ohms output with 2700 Ohms
across the tube (no voltage on the tube). Some minor adjustment of
L1 had to be made to get the 10 and 15 meters to properly work.
Plan is to apply the voltage and RF drive and see what happens.
Thanks to all who responded.
Merry Christmas and Happy New Year
At 11:05 PM 12/14/2006, Mike wrote:
>Hello,
>
>Just finished(?) a homemade GS35-B amp. for 80, 40, 20, 15 and 10
>meters. All the control, metering, input and filament circuits are
>working the way they should. Unfortunately, the PiL output network
>isn't working as assembled and tested on the bench. A description
>of PiL network's design, assembly, bench and in the amp testing
>techniques are below. The question to the group is what are the
>variables I'm not taking in to account that could be throwing off my
>measurement from the bench to the amp? Also, what are the proven
>technique(s) for adjusting (finding the taps on the L1 coil) a PiL
>output network?
>
73,
Mike, K4GMH
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