Thanks to Sverre Holm for giving me the test approach to find my problem. Scratching Q21 on the main board gave me sufficient noise pulses to trace the noise blanker operation using my OLD scope. My problem was Q5, the noise gate transistor. Good drive pulses to the base, but since there is no collector voltage on Q5, I couldn't test it. Replacing Q5 with a 2N4124 (npn) transistor I had on hand cured the problem. KNB2 works just fine.
Thanks for everyone's help
Rich W3ACO K2 S/N 4023
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