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Best Mullard 12AU7?

Posted by aarocks on June 2, 2017 at 19:39:52:
I'm using the Mullard CV4003 and I was about to buy a backup when I thought I should check for a better Mullard 12AU7 version so I can use the better version and keep the CV4003 as the backup. Any recommendations? Are the M10 or the CV491 better than the CV4003?