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Dave, would you mind sharing the circuit of your set up to give me a few ideas how to go about the addition of the display?
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The X and Y amplifiers were copied from the Y amplifier of a Radio Constructor design around 1975 by Robert Penfold, the tube was a 3RP1A and the biasing was from the data sheet the power supply was a simple series regulator. The schematic was hand drawn I will photograph it in the next few days and post here. A capture of the X and Y amplifiers is attached.
Dave
GW7ONS