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Questions about tubes and gear that glows. FAQ

To worry about which variety of 12AU7 is better, seems a bit pointless to me

Unless a 12AU7 is used in follower mode (mu or cathode follower) with full degeneration ie 100% local feedback, they aren't a good audio tube at all. Not good for gain duty. Any working 12AT7 or AY& will eat them for breakfast.

This information has been around for a long time, and you haven't noticed?

If you want to improve the sound of a device with 12AU7s 'designed?' into them and used to provide signal gain, replace them with something else within the power transformer's heater limits.

If those limits won't allow you to do that, get rid of the device.

Rolling 12AU7s, in gain stages, is a waste of money and time.






Warmest

Tim Bailey

Skeptical Measurer & Audio Scrounger


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