The model 5 prototype was IIRC the last before the CT-100 (and nearly identical to it), and I hear the 4 used selenium rectifiers for the B+ so it was probably an earlier prototype....
What a shame that it was destroyed, CT-100 and Model 5 sets have fetched as much as $10K in the past...There may not be another one like that left.
About the only pre-model 5 proto type in existence that I know of is owned by my friend Nick Williams (Miniman82) and probably is still on display at the Early Television Museum.
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