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==Links== | ==Links== | ||
* [https://www.pa4tim.nl/?p=3398 General Radio GR-1620A capacitance ratio bridge] @ Fred PA4TIM's site | * [https://www.pa4tim.nl/?p=3398 General Radio GR-1620A capacitance ratio bridge] @ Fred PA4TIM's site | ||
* [https://www.youtube.com/watch?v=0HgORsPr01Q GR-1620 operation] @ YouTube | |||
* [[Media:GR Exp 1615-A 1620-A 08_1962.pdf|Experimenter August 1962 describing Types 1615-A and 1620-A]] | * [[Media:GR Exp 1615-A 1620-A 08_1962.pdf|Experimenter August 1962 describing Types 1615-A and 1620-A]] | ||
* [[1240-A|1240-A Bridge Oscillator-Detector]] comprising | * [[1240-A|1240-A Bridge Oscillator-Detector]] comprising |