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Did someone nick your speakers?

Nice pic, but no speakers?

I've never used an AT7, but the 5751 in place of and AX7 is very common sub many folks like. Some designers, like Ken Stevens of CAT, specifically warn against using a 5751 in the spots in his preamp that are designed for the 12AX7. At least in part, Mr. Stevens warning is also based the claim that the 5751 constrains dynamics of his preamp. He designed it, so I see no reason not to take him at his word.

In the past I've used a 5751 in place of an AX7 more like a tone control in my CD player which has a tubed output stage. Used the 5751 to balance the sound of an RFT 12AU7 in the circuit with it. Although I no longer use the 5751 in that CD player, it did provide an excellent counterbalance to the rather clinical sounding RFT.





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