[Findm-Keepm]

American Radionic made the original white caps - Zenith and GE used these. Magnavox used a grayish American Radionic cap in their modular chassis (703744-X regulator sets, remember those?) Both Maggie and GE used ERO (Roederstein of Germany, ERO on the cap, now part of the Vishay group) as replacements - both were Blue bodied 4-lead caps. Zenith used 4-lead polypropylene orange drops - basically, their 716P dielectric, with heavier foil and a 4-lead fail safe configuration. Most were issued in kits, 800-something. The fail-safe opened the B+ to the Horizontal Output Transistor.

The American Radionic and the older CDE ceramic caps (two two-lead ceramic caps) failed open, detuning the flyback, causing the Horizontal drive to increase, increasing the HV to a point of failure.

Only the BLUE ERO/Roederstein and Sprague Orange Drop 4-lead caps were ever used by manufacturers as replacements. Orange EROs exist, and were the early GE replacements, but failed often. Only BLUE EROs were cleared in the GE chassis. Admiral used a multiple cap arrangement, similar to the 22-5001 Zenith .0018uF/1600V caps. Sears went with the Blue EROs (smaller values than the GEs, IIRC) in their sets as replacements - I have one NOS somewhere, but don't expect to find one of the old 528-prefixed Warwick sets.

The American Radionic caps and some Orange ERO 4-lead caps still show up on Fleabay, most in Workman or other discount blister packs. We dumped them at Cain Electronics in the mid-80s, after doing the research with help from Bluefield Distributing (a Zenith Distributor...). I still have one of the gray American Radionic caps, NOS in a Workman package, I merely kept it as a joke.....