For your consideration are two Mullard 12AX7 ECC83. These tubes were tested on a TV-7U where the minimim reading is 32 and the reading for a new tube is 49 or better.
Item Tag: Mullard 12AX7 ECC83
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2-Mullard 12AX7 ECC83 Grey Ribbed Vintage Electroncs
For your consideration are two Mullard Shield 12AX7 ECC83. The tubes tested at 48-50 & 52/56.
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2-Mullard 12AX7 ECC83 Labeled for Fisher Vintage Electronics
For your consideration are two Mullard 12AX7 ECC83. These tubes were tesed on a TV-7U where the minimum reading is 32 and the reading for a new tube is 49 or better.