Can preamp tubes be replaced individually?

Talk about tubes and their effect on your tone

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Bottle Rocket
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Joined: Thu Apr 12, 2012 12:53 pm

Can preamp tubes be replaced individually?

Post by imc2111 » Mon May 28, 2012 3:17 pm

Tube amp newbie here.. Heard that power tubes should be replaced in pairs (correct me if wrong), what's the deal with preamp tubes? Is it ok to replace individually?

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Mark IV
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Joined: Sat Dec 11, 2010 5:49 am

Re: Can preamp tubes be replaced individually?

Post by Jackie » Mon May 28, 2012 4:24 pm

No, preamp tubes don't need to be matched, nor do you have to adjust any voltage or watch for any ratings. Just pop it in, that's it. Make sure it's a 12AX7 or ECC83 (same thing, different name, the former is US, the latter European) though. If you use for example a 12AT7 or 12AU7 (aka ECC82 and ECC81), you might get a thin sound, or lower gain.
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