OTL tube amplifier production

6N5P is a low internal resistance tube with an output impedance of more than 400 ohms. It is used as a parallel push-pull tube. Its output impedance is half that of a single tube. If
two or three plate tubes are used in parallel , the impedance will be further reduced, so it is unnecessary to use double tubes at the output transformer port. Power supply and reasonable bias
adjustment can eliminate the need for output capacitors. The complete circuit is shown in Figure 1-33.
    The figure shows the working voltage o RPl between each stage. RP2 is set to the maximum resistance value, which is used to adjust the final stage screen current and midpoint output.
Set the multimeter to 1V and measure the voltage across the 5,(! resistors of the upper and lower tubes respectively. Adjust RP1 and RP2 to reduce the voltage at both ends of the resistor to 0.2V.