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In Reply to: Mullard CV4004 or Mullard ECC83? posted by acass on October 15, 2014 at 10:56:28:
Mullard CV4004 were originally built for Britih military and are constructed using a different physical geometry. Tube fanatics call it the box plate, because the plate structure is a rectangle when looked at cross section wise. Grid windings are different, too, extremely fine and barely visible to the naked eye, although electrical characteristics are identical to a 12AX7 or ECC83.
Obviously they were manufactured with a slightly different 12AX7 characteristic in mind
Most Mullard consumer 12AX7's had a plate structure which was pinched at the ends. I have seen a few 4004's in consumer boxes and label ECC83, however
YMMV and FWIW
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Follow Ups
- RE: Mullard CV4004 or Mullard ECC83? - unclestu 11:33:10 10/15/14 (16)
- RE: Mullard CV4004 or Mullard ECC83? - Al Noakes 08:19:49 10/16/14 (8)
- RE: Mullard CV4004 or Mullard ECC83? - Tre' 08:51:03 10/16/14 (7)
- RE: Mullard CV4004 or Mullard ECC83? - Al Noakes 07:45:47 10/17/14 (6)
- RE: Mullard CV4004 or Mullard ECC83? - ralpheburns 21:14:11 10/21/14 (5)
- RE: Mullard CV4004 or Mullard ECC83? - ralpheburns 06:34:47 10/22/14 (4)
- what preamp - unclestu 23:34:47 10/23/14 (3)
- RE: what preamp - ralpheburns 07:57:23 10/24/14 (2)
- RE: what preamp - unclestu 00:57:14 10/25/14 (1)
- RE: what preamp - ralpheburns 07:34:56 10/25/14 (0)
- RE: Mullard CV4004 or Mullard ECC83? - acass 11:52:54 10/15/14 (6)
- what tube(s) - unclestu 13:48:20 10/15/14 (5)
- RE: what tube(s) - acass 15:37:32 10/15/14 (4)
- RE: what tube(s) - unclestu 16:59:39 10/15/14 (1)
- RE: what tube(s) - acass 17:17:32 10/15/14 (0)
- Link... - FenderLover 16:54:55 10/15/14 (1)
- RE: Link... - ralpheburns 07:36:23 10/25/14 (0)