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07-06-2013, 11:13 AM
electroking
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Join Date: Dec 2007
Location: Montreal (QC), Canada
Posts: 743
Dating is based on the following:
1 - Octal tubes were introduced in 1935-36.
2 - Metal tubes with top grid caps (6K7, 6Q7, etc.) were nearly obsolete
by about 1940-41.
Bye for now.
electroking
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