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RE: 12ax7...seeking darkish, romantic and lush sounding

I wouldn't worry about the reduced gain or overworking the amp. The in-circuit gain that you get from a 12AX7 is usually much less than the datasheet's factor of 100, so a 30% reduction ends up being a pretty marginal difference in the calculated/resulting gain. The difference in settings will exist, but shouldn't be drastic.

As for the overworking of the amp, it won't happen. If 10 o'clock gets you your desired volume with a 12AX7, it's only natural that a 5751 might require a bit more signal input to allow the overall same volume output from your power amp and speakers. Also, by the data sheets, they have a similar input voltage rating, so I don't think you'd encounter a grid-current scenario and "overdrive" the tube by letting more signal into the tube; if 12 o'clock didn't cause your signal to break up with a 12AX7, I doubt the 5751 will be an issue. If you do encounter problems, reduce your source signal so that it doesn't lead to grid-current in the 5751.

Hope that helps!
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May your tubes be lively, warm, and long-lasting. Holy be thy heater.


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  • RE: 12ax7...seeking darkish, romantic and lush sounding - TubeAcolyte 08:27:37 03/18/16 (0)

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