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Interchange with a 5751 and a 6FQ7.

I'm hoping to upgrade and replace my 5751s. One RCA went bad and so have the GE Jan stock
CJ tube in place now. The 6FQ7s are RCA  Cleartops . The amp is a CJ PR12 with 5751 input tube and 2 6FQ7s as the driver.  12AX7?  12AU7? Thnx
cjlover
marco1's avatar
marco1
496 posts
 
Used mullard as drivers and ge jan 5751 in my 12's.  Tried many. This was one of the best combos.
marco1's avatar
marco1
496 posts
 
Sorry meant to Mazda as drivers
atmasphere's avatar
atmasphere
11,615 posts
 
The 5751 is a rough equivalent to the 12AT7.

The 6FQ7 is the same as a 6CG7; the 12AU7 is similar but with 1/2 the plate current capacity.

They use a different filament connections (the 6FQ7 is 6.3 volt filament with no centertap) so they are not interchangeable.
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