Zenith Roundie Craigslist Score!

[Findm-Keepm]

Originally Posted by old_coot88

There's an early version of this coil which is OK. The coil form is brown phenolic and does not disintegrate with age. Later versions ARE a problem. The coil form is easily identifiable as an off-white, semi-translucent plastic (nylon?) material. This is the stuff that disintegrates.

Ah, yes - the translucent "natural" colored coil forms that failed - not to be confused with the pigmented white and yellow ones. Miller made the replacements - for themselves and Zenith. Miller used white for themselves, and yellow for Zenith.

Admiral addressed the natural nylon problem in some of their tall chroma coils and transformers - they would break up at the base - we always assumed it was from getting too hot, but they said otherwise - the nylon simply dried out - constant heat and low humidity was the problem.

Funny how Zenith moved from phenolic and fiber coil forms to avoid the seizing problems that plague those materials, and created another more serious problem...