01-18-2018, 02:34 AM
The 6L6G is basically of similar size to a 5U4G, it that is of any help. You could also use a 6L6 in place of a 6L6G but it will look out of place in a Philco. I would consult a tube manual if you want to know whether a GA or GB could be used electrically and physically in place of a 6L6G.
Regards
Arran
Regards
Arran