[Amps] Tank Coil spacing

[Steve Thompson]

> With 10.5pF on an 8877 for instance a pair of them and 21pF is almost the
> necessary 35pF or so to resonate.  That makes a bread slicer not be able to
> get the job done and vacuum pretty close to the minimum also.
Something I found with external anode valves (4CX250 - 8877 sizes) is 
that the actual capacitance from anode to ground when they're mounted in 
a chassis, not close up against side panels, is roughly double the Ca 
value in the data sheets. The data sheet value is measured in very 
isolated conditions.

Steve