UP FOR SELL IS A LOT OF 2 PIECES HEATHKIT MADE BY MULLARD 12AX7/ECC83 LONG GRAY PLATE O GETTER WITH CODE NUMBER. X2 F92 X2 B9C. WITH TESTED GOOD. MADE IN GREAT BRITAIN. WITH RETURN ACCEPT WITHIN 30 DAYS EBAY POLICY AND FAST SHIP. THANK YOU FOR LOOKING.