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Where does Mesa put the serial number on an Express? My vision stinks but I can't see one anywhere.

I've been swapping tubes around since I got my Express 5:50 last month; was basically happy with what I got from Doug's Tubes: V1 Tung Sol 12AX7 V2 NOS JAN GE 5751 V3 Penta 12AX7 V4 Sovtek balanced 12AX7 V5 Penta 12AX7 I had also tried a few other NOS tubes in V1 and V2 (Ge 5751s and a balanced...