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Kora Explorer 90 amp- are 12ax7 tubes ok?

I have a Kora Explorer 90 that's in need of some new tubes. I just wanted to make sure that it's ok to replace the two 12at7 tubes with 12ax7 tubes. I googled some info that appears to say this is ok as a "tweak" but I can't seem to download the manual from the Kora website to make sure it won't harm the amp. Any help or advice is GREATLY appreciated. Thanks!
toddsheels

Showing 1 response by cyclonicman

cyclonicman
693 posts
 
In most cases it is okay, as long as the ciorcuit can handle the 12AX7 which has a gain factor of 100, while the
12AT7 has a gain factor of 60. I would be certain before you make the switch. The amp may get more noise with the 12AX7.
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