Matched pair 1957 Mullard 12AX7 Tubes, Blackburn, UK, tested

For Sale: Set of vintage tubes just tested good on a Precision 912 tube tested. Made in 1957 in Gt. Britian Blackburn plant.

They each tested in the Good range at about 60-63 on both tests. On this tester anything that tests 45 or below is considered bad and should be replaced. Also tested for noise, no issues.  Also checked audibly by putting in a vintage guitar amplifier and playing for about half an hour, amp sounded great.

I think these have the long plate and square getter but not an expert on them. They are marked MC1 B7C and MC1-B7B. The lettering is in pretty nice shape on both.

Additional higher resolution photos are available on request.

Send your zip code and city for a ship quote- should be between $4.99 and $6.99 if you are in USA. (Nov. 2022).