Home › Forums › Help/Technical Questions › replacing english muff’n tubes

Viewing 9 posts - 1 through 9 (of 9 total)
  • Author
    Posts
  • August 7, 2009 at 10:07 am #78738
    Tampa_B
    Member

    I’ve been able to get some quality U.S.A blackplate raytheon 12AX7 tubes from my electrical engineer Grandpa the other day and now i’m considering putting one in the good ole muff’n.

    is this a gernrally good idea to do, i know the amount of gain will prolly go up considerably considering the kind of tubes are going in.

    anybody done this before?

    August 7, 2009 at 1:58 pm #100381
    B.Daws
    Participant

    What replaced the tubes? or replaced them with AX7’s? It’s easy to replace them just unscrew that metal cover pop em out and insert the new ones. As for the 12AX7’s I have heard it sucks with them. The AY7 has a lot less gain than than the AX7. The AT7’s might be ok I have just heard the AX’s make the Muff’n buzzy and muffled.

    August 10, 2009 at 8:42 pm #100478
    Tampa_B
    Member

    well, i stuck an AX7 in to see what would happen and my tame english muff’n turned into the metal muff’n from hell. its a bit harsh sounding but not unusable.

    August 11, 2009 at 2:01 pm #100494
    B.Daws
    Participant

    Yeah I have heard AX7’s make the Muff’n out of control. Try some AT7’s or maybe even some 5751s if you can find them!

    http://thetubestore.com/gainfactor.html if you use this you can see what tubes are switchable with which. The Muff’n has 12AU7’s so AX7’s aren’t even suggested for use in the circuit!

    August 11, 2009 at 5:01 pm #100496
    adumo
    Participant

    I don’t know if this has been mentioned but cover your hand with a sock while doing this. This prevents the oils from your hand from going onto the tube. These oils can “crack” the tube after a while.

    August 11, 2009 at 8:16 pm #100503
    puretube
    Member
    Quote:
    I don’t know if this has been mentioned but cover your hand with a sock while doing this. This prevents the oils from your hand from going onto the tube. These oils can “crack” the tube after a while.

    Or even better: use the Tube-Glove instead of a sock…

    [img]http://www.newsensor.com/images/product_258/untitled.bmp[/img]

    August 11, 2009 at 8:19 pm #100504
    B.Daws
    Participant

    That is freakin’ sweet!

    March 11, 2011 at 3:36 am #114619
    MadDave12
    Member

    Regarding “use gloves/socks/paper/etc.” when handling tubes, I’m pretty darned sure that’s a myth; by the time the tube gets hot enough for foreign substances to matter, all the volatiles in your fingerprint will have long since evaporated.

    I mean, think about it… they put colored paint on the tubes, don’t they?

    I realize that’s not popular wisdom, but “popular” and “wisdom” never went well together anyway… ;-)

    March 11, 2011 at 4:07 pm #114621
    melx
    Member
    Quote:
    Regarding “use gloves/socks/paper/etc.” when handling tubes, I’m pretty darned sure that’s a myth; by the time the tube gets hot enough for foreign substances to matter, all the volatiles in your fingerprint will have long since evaporated.

    I mean, think about it… they put colored paint on the tubes, don’t they?

    I realize that’s not popular wisdom, but “popular” and “wisdom” never went well together anyway… ;-)

    I agree….

    …I’ve never bothered and I’ve never had a valve crack or blow up or whatever because of it. If you are worried I’m sure just washing your hands before would suffice.

  • Author
    Posts
Viewing 9 posts - 1 through 9 (of 9 total)
  • You must be logged in to reply to this topic.