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Perhaps this is because of the severe starvation the ax7 will feel here. One might adjust some values in the circuit to get more appealing results with it. Maybe it's just too far out of its range to get the desired output.
The filament of both the 12ax7 and 12au7 use 12v. You can starve the plate voltage of any of this group: 12ax7, 12at7, 12ay7, 12au7. They have different gain factors 12ax7 having the most with 100 and the others are 60, 40, and 17 in that order. The 12ax7 can handle 330v on the plate but can also use less "starving" it. That causes it to distort, which is the purpose of this circuit. They all should operate but they will sound different, I predict the 12ax7 should distort earliest out of these tubes because it's starving the most in this application.
From what the author and others have said the 12ax7 may just be too starved to get any meaningful result.
I cast one like this instead of machining it once. But it will tarnish black if you don't clear coat it.
Rapid Fire Mouse Button
Smokey Shitake Chicken Ramen.
DIY In Ear Monitors
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