Quote:
Originally Posted by emu!
Billm:
This is great info. I didn't know that there was such an animal. I googled 12dw7 and found the tube data. Looks like triode 1 has an amplication factor of 100 and triode 2 has an amplication factor of 17.
Do you know of any other preamp tubes that have different triodes in the same bottle...that can fit in a 12ax7 socket?
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There is a "mirrored" 12DW7 too, where triode 1 has an amp. factor of 17 and triode 2 has 100. I just can't remember what it is called, perhaps Billm does?
In a circuit such as the 5E3 with a concertina PI this could make a difference if you either want to push the PI triode of v2 with 17 % and the other with 100 % or vice versa. Never tried it myself though.