Hi Group My name is Bill KB9IV. I'm having a heck of a time with my now refurbish R4B .
After I replace most major caps and electrolytic I found the T8 Notch assembly had a shorted cable to 145 VDC! I bought a used T8 with cables........great success. The R4B had now superb receive although T8 notch had to be re-centered. Also I adjusted the S-meter per the manual...all went well. section (6.4.9 page 35). The real trouble began when I needed to adjust the PB tuning to re-center the function, after the Cap change it now has shifted to the left of center (straight up). With a attempt to adjust 50Khz Oscillator (step 6.4.2) page 30. I could not find TP3 as indicated?? What TP3?? on Calibrator Brd?? I Only find TP1, TP2 who wrote these lame instructions? What other error typo's are there? Must be a easier way? I do have the cap & resistor load. Now I've lost the -1.35 DCV AVC..........only a narrow AVC voltage 0 to -1.0 Max, the S-Meter has little movement was OK before adjusting T11 a bit and returning it to original position.........it does nothing. The Bias will adjust with AVC Off but little with AVC on...........did "Murphy's Law" strike? All Tube Voltages and Resistive readings look normal, perhaps a Diode or Transistor went bad in the AVC loop. The Tubes were retested also. Any suggestions or comments are welcome. Desperate in Minnesota Bill KB9IV
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