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XA and XB are NOT hybrids...but totally SS. Hot chassis too. Uses a class A audio with one large transistor out and large sink--I thnk near H-out. I have at least one--a 13" or so. Works...not sure about tube...do NOT think it is real good. (GE BW tubes at least...were NOT all that long-lived...at least by the 1970's anyway..)
I thik the XA came out around 1974 or so...the nearly indetical XB followed a year or two later--and REMAINED till I think the early 1980's or so.
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