Tube Rolling the 12AT7 for the 12AX7, or substituting a 12AT7 in a position designed for a 12AX7.
Link to Quality Vintage Tubes: [ Ссылка ]
NOTE: Anytime you want to substitute a different tube than what your tube amplifier calls for, do some research first, check the data sheets and proceed at your own risk! Some positions will not work well, an example of this is a Phono Preamp, the EQ circuit is often linked to these tubes and a 12AT7 may change the sound!

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