Tubes Asylum

Yes. PX4 and occasionally PX25 (nt)

70.68.233.188

bouncy ball

In Reply to: RE: Who uses European tubes? posted by andy evans on October 05, 2021 at 02:21:12

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Follow Ups:

Tell us more about the PX4 and PX25.... - andy evans 02:00:54 10/14/21 (4)
The PX4 is a very nice tube by reputation. There's TJ Fullmusic new production version with 15W dissipation. So is it any better than a 2a3 sound-wise? All the versions, NOS or new, are very expensive, so it would need to sound superior to a 2a3 to have any viability.

The PX25 has brilliant specifications - better than the 300b. So why did it die out and the 300b become so influential? There are KR and TJ versions, but again very expensive compared with 300b.
- RE: Tell us more about the PX4 and PX25.... - bouncy ball 15:42:09 10/16/21 (0)
  My PX4 is ST shape, nickel plate.
  I also have a pair of Cunningham mono plate 2A3.
  After years of comparison, ECC35 direct couple to both, I prefer px4.
  thicker and warmer tone.
  If you happen to like Ortofon SPU, you will get what I mean.
  
  Mono plate 2A3 is a fantastic tube. It is really the king of 2A3.
  I like it but I still prefer px4 for her midrange glory.
- Which spec is better n the PX25 than the 300B? - maxhifi 10:15:22 10/14/21 (2)
  Going over the data sheet, the 300B has higher ratings, and comparable linearity. Plus it doesn't have the hard to find socket.
  And, the 300B didn't die out because it continued to be made through the 80s for replacement use in the AT&T telephone network, whereas the PX25 had a much shorter original production life.
  The PX25 looks more comparable to the US type 50, than to the 300B in terms of performance.
  What am I missing?
  
  Edits: 10/14/21
  - 300B were made through the 80s for AT&T... - andy evans 13:23:23 10/14/21 (1)
    Interesting piece of history - so that's what kept the 300b alive.
    What kept the 2a3 alive? That is still made in decent numbers?
    Ah - these legendary tubes - PX4, PX25, AD1, 50.... Nothing saved them even though they sounded great.
    
    Edits: 10/14/21
    - RE: 300B were made through the 80s for AT&T... - maxhifi 13:41:01 10/14/21 (0)
      2A3 was made in massive quantities for replacements in radios and amplifiers, probably also some military use. Still fairly easy to find on the used or NOS market.
      
      Those vintage UK tubes you're talking about are rare and precious. The closest thing I have is a pair of original GEC KT66. Absolutely beautiful tubes, I hope I can find another pair some day!

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