Re: Standard Beam Approach - Rebuild update
Looking at the R1124 schematic, I am not surprised you had difficulty finding the oscillator signal. Grid 2 of V2 effectively operates as an anode for the oscillator (its fed HT+ via R7). And that's probably the point where you finally find some sign of oscillation taking place.
Unfortunately merely attaching a scope (or other) probe to random bits of circuit is enough to stop an oscillator operating at all due to the loading the probe introduces.
Richard
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