Mallards should work great however it depends on the circuit you will just have to try.Good luck.
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Update: Over the past year, I’ve rolled several tubes in my preamp. The Psvane 12au7-TII have it all. Quiet, clean & dynamic - with sweet/smooth highs, solid midrange body and deep, punchy bass. (No bloated midrange of the Mullard 8136) The search is over. Great sounding new production tubes without the outrageous prices of NOS.