[Amps] Parasitic Oscillations in RF Amplifiers

[Tom Rauch]

> **  A dipmeter shows that a directly-grounded 3-500Z grid is not grounded
> throughout the VHF range.

Making a measurement that is meaningless won't help much.

A dip meter does not tell you impedance. It will dip where impedance is
minimum, or maximum, depending on the system being tested.

The only correct way to measure shielding of the grid, or impedance of the
grid structure to ground is by measuring the anode-to-cathode feedthrough or
transmission loss. Otherwise, you could be measuring almost anything.

73 Tom