UK Vintage Radio Repair and Restoration Discussion Forum - View Single Post

kalee20 · 11th Apr 2019, 8:39 am

It's a voltage doubler rectifier creating DC for HT, with the heaters powered directly from the transformer (so yes, running on AC).

These valves are indirectly heated, so are designed to run on AC. Directly heated valves are often restricted to DC only on the filaments (as for battery valve receivers) but can also be AC (eg 2A3 output triode; DY81 rectifier).

11th Apr 2019, 8:39 am	#3
kalee20 Dekatron Join Date: Feb 2007 Location: Lynton, N. Devon, UK. Posts: 7,088	Re: Dc filament / capacitor It's a voltage doubler rectifier creating DC for HT, with the heaters powered directly from the transformer (so yes, running on AC). These valves are indirectly heated, so are designed to run on AC. Directly heated valves are often restricted to DC only on the filaments (as for battery valve receivers) but can also be AC (eg 2A3 output triode; DY81 rectifier).