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There are some strange sets out there with transformers for filaments and voltage doublers for the B+. Zenith had some sets like this, which appear to be "safe" when you see the (relatively large) power transformer, but turn out to be hot chassis designs. A particularly dangerous design for the unsuspecting technician. The Emerson 606 and related designs with all the 25Z6s are also of this type -- exactly as you remembered.
The Emerson 614D and 637A were early cases of 10" Emersons with no power transformer at all. Other examples of relatively early 10" completely transformerless sets include the GE Locomotive (models 800, 805, 10T1, etc.).
Last edited by Tom Albrecht; 08-28-2014 at 01:02 PM.
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