I picked up an R-4C in the flea market this year at Dayton. It was a later one, made sometime in 1977. I noticed that the mixer tubes, 6EJ7's are original and GE with date codes 1977 and were made in Great Britain. The plates on these 6ej7's are mesh, not solid. I've always thought that Drake used Sylvania tubes and that their 6EJ7's are quieter than most - less crackling noise. Did Drake try these mesh plate tubes to address the noise issue and are they any better?
Finally, the PTO has metal gears on it, not molded nylon. Was that a design change? 73 NO8J
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