What is the 6x4 tube use for in a hammond organ?

Answer:
its 1 of 8 tubes from the Hammond Preamp AO-28 (in B3, C3, A-100 console models)
Its a rectifier tube. you can read here, what a rectifier is:
http://en.wikipedia.org/wiki/Rectifier
First answer by ID1530097302. Last edit by ID1530097302. Question popularity: 14 [recommend question].