Thanks to ALL and everyone for help with this month old problem. The 160 meter CW contest drove me over the edge with my TS-480 on receive, and had to sort out the C line xmitter issue so I could easily use the R-4C, or be in the depths of AGC pumping for the weekend.
Took a hair dryer and heated the under chassis area of V9 (Osc) and V7 (Amp) on T-4XC and initially the problem did not arise. I continued to heat to the point I was concerned it was getting to hot, and the output power went to zero and sidetone was gone. I sprayed "freeze it" on the componenets in the area of V9 and V7 and no change. I then wiggled V9 and noticed the power was intermittent. I replaced tube and had the same issue. I resoldered all solder joints on V9 and still had the same issue. I took a "pick" and "adjusted" the pins of the tube socket and the problem was solved. Occam's Razor baby........................just Occam's Razor! Jim WA9ZBV
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