Rob, Bob, and Michael,
???? Thanks for your suggestions.? Looks like the problem noisy tube was V5 (6BA6) Last IF Amp tube. I had a spare on hand so I should be good for now. I had not had the covers off my R-4C for a while and had forgotten how much Drake had packed into such a small space. What a great receiver, especially with the Sherwood mods!
--Ed, N3CW--
