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Always use the latest suffix letter of a tube type when getting new tubes. It is the most advanced and has the best ratings, such as increased current and voltage ratings.
The 6L6 GC is probably the most dramatic of these evolutions...the metal 6L6 or the curved sided 6L6G is a 19 watt plate dissipation tube while the 6L6 GC is around 30 or so watts. Some of the later model equipment such as a Bogen PA amp relies on the higher ratings of the GC and will overload an old 1930's 6L6G.
Some of the HV tubes such as 6BK4C and 3A3C I believe were designed in the 1970's to control x-ray emission to a certain standard level wheras the older versions were not certified as to x-ray emission.
Last edited by Chad Hauris; 08-11-2005 at 11:23 PM.
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