[Findm-Keepm]

It would be nice to have some concrete results - all I'm hearing is "I believe," "I think" and "I've heard"...

A schematic of the mod, a screenshot, and a narrative would be nice.

I have dug out bad HV rectifiers from potted flybacks ('twas nice to have a dentist office next door with an underused Xray machine) and I've seen an doubler added to generate HV in a Conrac color monitor with a bad (internal arcing) potted doubler. That one was in an ATE station aboard the USS Theodore Roosevelt and our NDI shop Chief did the Xraying. We used a doubler originally used in a Xerox machine, after first frying a Tektronix doubler from an oscilloscope - it didn't have the current capability. The arcing caused tearing of the raster, and with text being the primary display, it made it unusable.

To try a tripler in a tube RCA with the usual 6JE6, 6DW4, and 6BK4C would be problematic - coming off the plate of the 6JE6 would provide HV only - no horizontal sweep, and coming off the top end of the primary would add capacitance ( a tripler is all caps and diodes, with a possible resistor if a focus tap is provided) - you might be able to use a doubler in lieu of a HV rectifier if the HV is low, but regulation might cause issues - shunting a doubler would take a bit more current through the 6BK4C, and I dunno what that might do. A donut swap from a good flyback might work, but I've never seen two RCA flybacks with the same donut (PRI/SEC) schematic - I'll post the Thordarson schematics to show what I see...

RCA flybacks, as some have mentioned, provide much more than just HV - they provide Horizontal sweep to the yoke, focus voltage, sync pulses to the Chroma circuits, and convergence signals for the set. True they all operate at 15,750 Hz or so, but inductances, winding counts, and resistances all differ, making it all but impossible to easily swap out.