Not sure about mods, but I would really make sure that the problem is with the tunnel diodes in the unit you have. It seems strange that all four of them would have failed. There are other parts of the circuit are worth checking, and the Tektronix repair documents are very helpful.
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On 11/28/2021 1:24 PM, nanovnauser@... wrote:
well i have ordered 4 of these,is there any mods need doing to the 453 to use these diodes,or will they work as is?,cheers Paul.
