chinese Mullard 12AX7?

Discussion in 'Amps/Cabs Tech Corner: Amplifier, Cab & Speakers' started by Niblos, Jan 8, 2008.


  1. Niblos

    Niblos Member

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    I have a quick question for you guys. I am trying to discover exactly what tube is being described in the text below. They describe it as a "chinese Mullard 12ax7" but I haven't ever heard of such a tube. I have several NOS Tung-sol 5881 or Phillips 6L6GWB put away but I am trying to figure out the remaining to achieve this tone.

    "Brian Setzer is using either the Phillips NOS 6L6WGBs or Tungsol NOS 5881s, the amp is almost 10 watts less efficient hence the earlier breakup of the power section coupled by the "gainier" Chinese tubes that carry a bigger voltage than most NOS tubes and many Soviet reissues. It's running closer to 40 watts." and "The nature of the EQ in the normal channel is such that when the treble is dimed, the bass is slightly attenuated which cuts down on the speakers farting out in the lows - although the V30s don't give up the ghost very easily."

    More from TV - "The reason for the Chinese tubes from that period is that on a voltage ratings,they were the highest. Not necessarily the "sweetest and cleanest," but the best for gritty rockin. From what I am aware of the Chinese Mullard is the only thing to get close to the fabled tube. Tophat amps, the company that rebuilt my blonde told me to stick with the Mullard Chinese 12ax7 in the front and either the NOS Phillips 6G6WGB or the Tungsol 5881. If you compromise in the vintage power tubes, it'll be difficult to get close to Setzer's tone clip. The marriage of the small bottle power tubes with their bubbly jangle and the gain structure of the the Chinese pre amp tubes are "that" thing. You can fake it by having the treble bleed off caps removed from the first channel and then just using a jump patch cable from that channel to the normal channel..but...the Setz'...the Setzer master does it the right way. Not to mention that TV Jones confirmed that he is still keeping drilled aluminum saddles in the ABRr bridge of his Hot Rods. FWIW..What's funny is many think Brian uses blonde fenders to grab a 60's surf thang..but that's far from the truth. The fact is that the amp, when tubed right, is like a Marshall JTM45 on fatass steriods...

    btw.. this is the basic info about the fabled Setzer Chinese preamp tube: The factory in Beijing, China that produced our popular 12AX7AC and 7025STR tubes, has stopped production. They have decided to devote their resources to computer screens, energy efficient light bulbs and other electronic devices. They viewed the tube market as too small with not enough profit. Interestingly enough, these were the same arguments made by American companies like Phillips and GE. Tom McNeil participated in many long hours of discussion with leaders of the Beijing factory, but nothing could be done to avoid the closing.


    At first I thought they were speaking about Ruby 12AX7A-C4 but this is not the case. Any ideas?

    I have been searching the web for the last six months or so but I haven't come close. I am currently seeking some NOS 12AX7s but honestly I don't really know what it is I need. This is the site I found the information:

    http://www.cathyandnick.com/Nick_pag...tzer_sound.htm
    [​IMG] [​IMG] [​IMG] [​IMG]
     
  2. Kelly

    Kelly Member

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    Groove Tubes and Sovtek have offered reissue Mullard tubes lately, but Ive never heard of Chinese Mullards.
     
  3. teleamp

    teleamp Senior Member

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    +1

    MikeY
     
  4. custom24

    custom24 Member

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    ..What's funny is many think Brian uses blonde fenders to grab a 60's surf thang..but that's far from the truth. The fact is that the amp, when tubed right, is like a Marshall JTM45 on fatass steriods...
    [​IMG] [​IMG] [​IMG] [​IMG][/quote]
    I will try for myself in moments, but would you say that orig Mullards from Brit stuck in my '65 RI Twin may have a similiar result? Or am I missing the point and these chinese are completely different?
     
  5. custom24

    custom24 Member

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    I really don't know exactly what the Marshall sounds like, but these vintage Mullards in my Twin are fantastic! Glad I tried!
     
  6. Groovey Records

    Groovey Records Member

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    TV is the moderator @ the TopHat forum. http://www.tophatamps.com/forum/

    Forum Name TV the Wired Turtle, I am sure he would clear it up for you.
    watch out though - he's a snappy guy

    also there was a recent thread on 12ax7's by the Groove Tube guy I can't put my finger on it but it said there is a 70'S NOS chinese 12ax7 cult because they have the highest gain and sometimes exceed spec

    TV'S YOUR GUY he's a rockabilly cat that knows where its at

    regards

    Joe Tee
     
  7. Jose Luis Garci

    Jose Luis Garci Member

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    Recently i've recieved a THD Flexi 50 with this tube in V1


    [​IMG]


    It is a NOs Beijin 12ax7/6n4, produced in the 90s, known also as Sino 12ax7, as far as i know ...
    Well, this tube rocks in V1 in my amp, incredible tones, full of life.
     
  8. zombiwoof

    zombiwoof Supporting Member

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    I just got a Ruby branded 12AX7 from Ebay, it looks and tests new, and looks just like that tube. Triple micas. And I got it for $.99!, no one else bid on it. Maybe I scored big. Haven't had a chance to try it out yet, but you've got me itching to do it now.

    Al
     
  9. Rosewood

    Rosewood Member

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    I've got a few of these older chinese 12ax7's with the square getter. Are all the Chinese square getter tubes the the same? They sure look it.
     
  10. zombiwoof

    zombiwoof Supporting Member

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    Is that the 12AX7 that is referred to as a "silver", or something? If so, when the Chinese factory stopped making them, Ruby got them produced again, it took them a year or more.

    Al
     
  11. Blue Strat

    Blue Strat Member

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    No, that's not the "silver special".
     
  12. zombiwoof

    zombiwoof Supporting Member

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    Thanks Mike for the clarification. Do you know which tube this Chinese one is that he's posting about? Seems like the stuff he quoted above is a little bit of "gobblety-gook" (Chinese "Mullard"?).

    Al
     
  13. dick wiewy

    dick wiewy Member

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    You sure they're not refering to the tubes with Mullard printed on them &
    the logos and crap wipe right off if you brush against it? I've heard of "Bugle Boy" branded tubes that are of India origin and highly suspect too.

    Look for double seams on the top off the glass, halo support welded to the wrong side of the plate and ill shaped holes in the plates. I wasn't aware of a higher voltage capacity. The uniform description regarding their sound was poor bordering on hammered dogshit.;)
     
  14. rockon1

    rockon1 Member

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    Surely the author of "Chinese Mullard" meant it to mean its the "Mullard of Chinese 12AX7 tubes". There is no such thing as a Chinese Mullard or even any Plillips style short plate 12AX7 that was made in China that I know of. Now on the other hand the Japanese Matsushita is often refered to as the "Japanese Mullard" but with good reason. The plate structure of the Matsushita is virtually identical to the rest of the Philips family of short plate 12AX7's of which the Blackburn Mullard 12AX7 is part. I have read that Matsushita used Philips tooling which would made sense considering the structure of the tube.

    Bob
     
  15. zombiwoof

    zombiwoof Supporting Member

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    I have some "made in India" tubes that I've found out were made by BEL, a couple are 12AX7 and two 12AT7's (with different brand names on them), and they seem to be very good tubes. One is actually a 6681 and has Philips codes on it, and has high gain. So, everything from India is not bad!

    Al
     
  16. rockon1

    rockon1 Member

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    Yes there are Made in India tubes similar to Phillips family 12AX7's made by Bharat Electronics, Ltd. (BEL)-Never actually owned by Philips but used Philips tooling. This is not the case with any known Chinese tube Ive heard of,seen,etc. Bob
     
  17. zombiwoof

    zombiwoof Supporting Member

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    I'm wondering why Mike K. hasn't responded about the Chinese tube in question, he posted in this thread and I think he might be able to ID the tube the OP is talking about.

    Al
     

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