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I have seen 3 15HP22s, including Dave's. They all had engineering sample labels on their neck.
I have also seen several CBS RX90 15" sets, which were designed to use the 15HP22 (according to the schematic). The RX90s were also all labeled as engineering samples.
So I speculate that Hytron, who made the 15HP22, and was owned by CBS, knew that in several months (summer of 1954) they would be releasing the 19VP22, so they and CBS only released the 15HP22 in very limited quantities, and probably none of them were used in commercially produced sets sold to the public. And CBS knew they would be releasing the CBS model 205 using the 19VP22, so all their 15" sets were labeled as engineering samples to prevent them from being sold commercially.
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John Folsom
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