Your DX60B final PLATE current is way too high!! The LOAD control should be set fully CCW and the PLATE control set within the selected band's label on the PLATE control. Switch to CW, adjust the PLATE control for a maximum dip in plate current. Adjust the LOAD control to increase the plate current to approximately 100ma then rotate the plate control again for a maximum dip in plate current. Alternate between dipping the plate current and increasing the load control until maximum power output of 50 watts is obtained and maximum plate current of 150ma, NOT over 200ma as your video shows. The DX-60B is a 90 watts DC input power transmitter with a typical maximum power output of 50 watts on 80 thru 15 and about 30 watts output on 10 meters into a 50-ohm load with a maximum plate current of 150ma. If you continue tuning your DX-60B to a maximum plate current of over 200ma, the final tube life span will be significantly reduced, and that current level puts excessive stress on the power supply!!
Your DX60B final PLATE current is way too high!! The LOAD control should be set fully CCW and the PLATE control set within the selected band's label on the PLATE control. Switch to CW, adjust the PLATE control for a maximum dip in plate current. Adjust the LOAD control to increase the plate current to approximately 100ma then rotate the plate control again for a maximum dip in plate current. Alternate between dipping the plate current and increasing the load control until maximum power output of 50 watts is obtained and maximum plate current of 150ma, NOT over 200ma as your video shows. The DX-60B is a 90 watts DC input power transmitter with a typical maximum power output of 50 watts on 80 thru 15 and about 30 watts output on 10 meters into a 50-ohm load with a maximum plate current of 150ma. If you continue tuning your DX-60B to a maximum plate current of over 200ma, the final tube life span will be significantly reduced, and that current level puts excessive stress on the power supply!!