• WARNING: Tube/Valve amplifiers use potentially LETHAL HIGH VOLTAGES.
    Building, troubleshooting and testing of these amplifiers should only be
    performed by someone who is thoroughly familiar with
    the safety precautions around high voltages.

12AT7 vs 12AU7 (interchangeable?)

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Jake,

That's an interesting question here. In many cases, you could drop in lower gain 12au7 and in those cases, it would probably work fine, if not under optimum conditions.

However, in what looks like a direct coupled phono stage with the equalisation wrapped around the tube in question, I would imagine that it's probably not a good idea. The operating point wont be exactly right for direct coupling and the different tube would likely change up the equalization some... how much, I don't know... it might not matter, it might change it quite a bit.

In this case, I would think it much smarter to spend $10 or so on a 12AT7 from somewhere and avoid the headache all together. Yeah?
 
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