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RE: Thanks, great info...it also explains a lot...

If you don't count the rectifier the tube complement /count of a 30 and 40 are the same. A 240 almost doubles the count of the 40. The difference is the input 12AX7. In a 40 (30 too), only one of the two triodes is used the other is disabled. On a 240 one of the triodes is used for the right channel and the other for the left. So the tube count for a 240 is (2X40)-1 or 11 vs 6.


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