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My Motorola literature agrees with yours. V17 is the 6BG6, V16 is the horiz osc 6SN7 and the 6AL5 (V15) is the horiz phase detector.
It could be possible, not very likely, the 6AL5 may have been replaced, socket and tube, with a 6H6. I have seen some weird 6H6G tubes.
On the tube in question, does it have two 100K ohm resistors connected to the socket?
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