[Argus25]

Regardless of the quality suitability of the integrator and interlace diode design in this set, I would expect the interlace to be pretty poor. The set looks like its still running original electros and the HT rail will be buzzing with H pulses and probably C67 is high ESR too letting these into the vertical oscillator and fouling up the interlace. Clearly the V oscillator is getting triggered by H pulses and not the leading edge of the V sync pulse, so your half line delay is going down the toilet.