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Radio Wrangler · 26th Mar 2020, 10:29 pm

Yup, you have an expensive ultrasonic oscillator there. Something is badly wrong. The senses of the feedback arrangements and the inversion sense of the amop from the feedback insertion point to the output are the first things to check.

This shows why a lot of experienced engineers treat their scope as their primary bit of test gear, not their multimeter. It tells you a lot more per stab of a probe.

David

26th Mar 2020, 10:29 pm	#39
Radio Wrangler Moderator Join Date: Mar 2012 Location: Fife, Scotland, UK. Posts: 22,905	Re: Quad 11 test run Yup, you have an expensive ultrasonic oscillator there. Something is badly wrong. The senses of the feedback arrangements and the inversion sense of the amop from the feedback insertion point to the output are the first things to check. This shows why a lot of experienced engineers treat their scope as their primary bit of test gear, not their multimeter. It tells you a lot more per stab of a probe. David __________________ Can't afford the volcanic island yet, but the plans for my monorail and the goons' uniforms are done