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will E80CF fit into yaqin 100b

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How could it possibly?
12AX7 is a dual-triode and E80CF is a triode-pentode.
At least you need to rewire the socket an strap the pentode for triode-use.
Since the 12AX7 contains hi-mu triodes and the E80(C)F triode is a low-mu you'll loose a lot of gain.
I strongly suggest you drop the idea....


rgds,

/tri-comp
 
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