Hi all you experts, have been meaning for some time to upgrade the tuned
input cct on my two 813’s in gg. Am going to try the cct by ZL1AXB using
a copper coil with the wire inside paralleled with a 900pf or
thereabouts air cap. Sure you have all seen it. Now if I put a nice
graduated scale for the cap, to record the relevant tuning points, what
is the best way to tune it. Am thinking of the explanation by Vic
Rosenthal, strapping a resistor equal to the input impedance of the
tubes across the cathode to ground.
So do I put a good SWR meter in between the solid state set and the
linear and adjust the variable cap for min SWR on each band and mark off
the points on a scale on the variable with the linear switched off ?. I
have had the odd triple bi-pass and the memory is just not what it was.
Cliff G4VJI MAIL@CLIFFLINDSAY.PLUS.COM
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