845 Tube Amplifier Schematic. The amp is 95 finished controls and connectors not mounted yet but quite listenable. The 845 vacuum tube have low amplification factor and it need high impedance transformers to get a good damping factor.
These larger tranmitter triodes need very high 800v to 1200v b plate voltage and lots of grid drive grid bias voltage x 2 for peak to peak audio signal. The transformer is a vacuum tube design. Since it is not rated for 2000 volts it is placed in the ground leg of the power supply circuit.
These larger tranmitter triodes need very high 800v to 1200v b plate voltage and lots of grid drive grid bias voltage x 2 for peak to peak audio signal.
An 845 or 211 amp isn t going to be the typical simple voltage amp power stage design like for a 6em7 or a 2a3 or 300b. The se amp board is being used to drive a 211 or an 845 through a powerdrive board. The completed amp and power supply. The b supply is similar to the power supply used in the simple 45 amp except for a bigger transformer and 500 volt rated capacitors.
