I got my two new 6BZ6's today and put one each in my two R-4B's. My station receiver's performance has improved dramatically. I now get background noise that is believable compared to what I see on my K3/P3. The roughness seems to be gone, but I'll wait before pronouncing a cure on that due to its intermittent nature in the past.
The recently-acquired R-4B now seems more deaf than when it had the defective 6BZ6 and I've tried re-aligning the AGC and S-meter calibration. The AGC now easily resets to -1.35V but I can't get the AGC (by turning down the RF GAIN) to -15V with the new tube. Not sure if I could with the old one, either, but it held the AGC to -0.75V with the old 6BZ6 and I could not get any more than that. It's likely this receiver needs some more tubes as well. I'll check all the resistor values going to the S-meter as well, as I've seen fried ones before. So it looks like I can put the cover back on my station R-4B and that cuts the number of naked receivers by 25% 73, Steve Wedge, W1ES/4 Time flies like an arrow; fruit flies like a banana. All my computers have my signature with various pearls of wisdom appended thereto.
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