This is an addition to my previous video: [ Ссылка ]
After finishing all adjustments, this old analog HP8444A generator is even better than I thought. Flatness well within +/- 1 dB over the whole 100 kHz to 1.5 GHz range. Very well engineered analog unit, and still working great today. Laboratory quality HP equipment might have lost most of its value, but none of its performance (that is, after you repair it...).
