25-05-2024, 04:11 PM
The Va and Vg2 are both rated about 170V on some diagrams.
I imagine there are more mainstream audio valves with plenty of design examples. You'd be a bit on your own unless you found a schematic for the B&O, which is likely push-pull, so a centre tapped or dual winding mains transformer will work for audio out. Maybe 20W to 30W depending on class AB bias level for push pull if really 9 W Pa. I'd imagine it gets hot with 5.7W heater too.
I imagine there are more mainstream audio valves with plenty of design examples. You'd be a bit on your own unless you found a schematic for the B&O, which is likely push-pull, so a centre tapped or dual winding mains transformer will work for audio out. Maybe 20W to 30W depending on class AB bias level for push pull if really 9 W Pa. I'd imagine it gets hot with 5.7W heater too.
