Blackburn code. Vacuum Tube. sections of a single tube. Within 3% I consider to be 'Balanced'. Heat Radiators. Dissi milar Sections Tested at 82/61. Clean tubes will radiate heat better & operate cooler.
Blackburn code. Vacuum Tube. sections of a single tube. Within 3% I consider to be 'Balanced'. Heat Radiators. Dissi milar Sections Tested at 93/68. Clean tubes will radiate heat better & operate cooler.