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I didn't think there were any series strung Predictas in a metal cabinet ? Aren't all the 17" metal cabinet (Princess, Siesta, Debutante) based on the 10L43 transformer chassis ?

As for the 21" series sets (9L37 chassis), they are really nothing more than the same chassis Predicta used in their console models (9L35) rearranged a bit. The only common issues I've encountered so far is the previously mentioned unreliable 21" CRT and bad power switches.

Ideally, you can get your hands on a 21FAP4, FDP4, EVP4 or similar reliable CRT that is the same size.