Prototype set is here

[old_tv_nut]

Originally Posted by Penthode

I
It appears of the two options, the 1952 field test used field alternation rather than line alternation. Is this correct? Slight phase errors would introduce flicker on image edges or chroma transitions due to the crosstalk not being properly integrated or cancelled.

Yes, field alternation was used. Wentworth's book on color television engineering states that flicker was bad due to difficulty of maintaining the exact relationship between the alternate phases in transmitter and receiver. The air-core coil that Nick found looks suspiciously like it was built to reduce variations with temperature, spacing to the shield can, etc., etc., but we won't know until we discover whether there is a phase switching circuit.

Also, the crystal appears to be missing, so we don't have that confirmation.