[RodB]

Hi Rob,

The bias battery can be 3 AA cells connected in series. You should get almost 5 volts. The vibrator can be thought of as an oscillator in the primary of a transformer. The 2 volt battery voltage is applied to the vibrator coil which pulls the armature. The armature contacts are wired to the transformer and as the armature moves the contacts make and break the 2 volts simulating an AC supply. The transformer steps up the voltage supplying a high voltage supply that can be used for B+. It appears the 2 volt rechargeable cell is a cell from a sulfuric battery like an automobile battery. Each cell of your car battery produces 2.1 volts fully charged. I don't believe you'll find a rechargeable one cell battery nowadays. That's about the extent of my knowledge.