MULLARD 12AT7 ECC81 NOS UK MADE Valve Tube. Will often replace ECC83/12AX7
MULLARD 12AT7WA NOS UK MADE Valve Tube. These are the best! Superb sounding double triode. Has slightly lower gain which may not even be noticed. In most cases will replace the hard to find and expensive 12AX7/ECC83.