[Boatanchors] OA2 Voltage Regulation Question

[wa9wfa]

For a properly biased OA2, what would you consider normal for changes in regulated voltage over small changes in load current.  I’m working on a Hallicrafters HA-5 VFO, and when I key the VFO, I’m seeing small changes in the OA2 regulated voltage (148V) on the order of 200-300 millivolts, and it’s kind of drifting up and down.  Is this normal? Now with that said, I need to yet investigate if the OA2 is supplied with enough current, and what the input voltage looks like while being keyed.  I’m hunting down minor changes in output frequency when it’s keyed.  Thanks. 73, Scott WA9WFA