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The idea of couplets always intrigues me. When I used to repair colour TV's in customers homes back in the 70's there was a Thorn model 4KA set which used a similar component called a Thick Film Unit which was essentially a couplet. It used maybe half a dozen of them and they were notoriously unreliable. You'd replace one only to have it fail a week later. Made techs look like fools unfairly. Yours will last forever I'm sure.
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