What's Wrong with the DC300A ?

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The D150A is a low cost, readily available, consumer stereo amplifier for driving loudspeakers at home, in a small studio or cinema.

Your contraption is none of the above.

..... Phil

Nice.. I was much lower end. Who makes the nmr stuff now? Japan? China? Germany? George H.

Oh thanks, I thought you said no schematic searching is needed? George H.

I think the only big NMR operation left is Bruker, a German company with a big US NMR operation.

I think NMR is fading away as an analytical chemistry technology. It's too expensive to run those big magnets.

Dunno about fading, but when our chemist retired, we gave away our NMR machine, which was in excellent condition, and in steady use right up to the end. It didn't have the highest magnetic field, but had many good features.

I have been to labs that had a high-field magnet in the corner, warm and collecting dust. It's really expensive to keep one charged with liquid helium.

My many MRIs were done on a machine with a reliquifier in the next room, gently chugging away. And an MRI makes $1000 an hour or something like that.