Re: Paillard 768
Yes, the bias for the 2A3 is developed across the loudspeakers field coil winding as per Post#7, the 1uF capacitor across the bias supply doesn't have to be a polarized type (electrolytic) it's outer foil should be connected to the ground line (chassis) in order to minimize stray hum pickup.
If measuring the heater voltage remember that the heater winding is center tapped to ground which means the heater voltage measurements should be done between the heater tags on the valve holder and not with respect to ground.
If the secondary winding voltages are notably low with full mains applied and the secondary's disconnected then the transformer is faulty.
EDIT: Post crossed.
Lawrence.
|