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C.M.I. SG-215/200

David Riggs

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Hi All!


New here, and I've got a puzzler for you.


I recently made a deal which included an inop SG System amp. The rear control plate states that it is an SG-215 but the literature Gibson sent me includes a spec sheet that says the SG-215 is all solid state. The problem is that there is a 12AX7 PI and two great hunkin' 8417 output tubes!


The spec sheet indicates that the only model which uses those tubes and has a master volume is the SG-200. So I asked for the SG-200 schematic and they sent it straight away (Aren't these folks great?) but it seems to have six power tetrodes! :- Can anybody shed some light on the subject for me?




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