Cobra 2000 frequency counter diode equivalent?

Cobra 2000 frequency counter diode equivalent?
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Greetings everyone. Does anyone know if there a modern equivalent diode available to replace D528 (XZ057 Zener) in the Cobra 2000 frequency counter? AI recommended the 1N4734A, which did not correct the problem. I wound up pulling a XZ057 from a parts 2000 counter. I would much rather install a new part, if available. Thanks to all.

Equivalents from the Sam’s 251 manual:

SK3057
ECG136A

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Author: iz4wnp