i know i'm dumb....but i need help

Discussion in 'Microphones (live or studio)' started by clay, Jun 8, 2005.

  1. clay

    clay Guest

    does anyone here know how to retube an amp? i mean i know how to put the tube in the socket but what is biasing? and is there anything else i should know?
  2. McCheese

    McCheese Well-Known Member

    Mar 24, 2005
    There's a bit here on biasing and stuff, it's aimed at owners of Fender Hot Rods, but it should give you an idea

  3. clay

    clay Guest

    ok but do the power tubes need to be "matched"?
  4. Tommy P.

    Tommy P. Well-Known Member

    Jan 10, 2002
    Matching is a good idea, but manufacturer claims of "matched " sets are sometimes inconsistent. Groove Tubes has a "hardness" rating, scaled from 1-10, with "10" being the hardest tube. I use 10's in my Twin, because I want maximum headroom and loudness without distortion in my power section( the preamp section is another story). I don't like power tube distortion in my "clean" amp. Its my personal preference. Contrarily, blues players will usually go the opposite way, and try to get tone by breaking-up the power tube section earlier.

    Great link McCheese. Thats one of the better biasing references I've read. I like the advise of the 7581A/KT66 substitution, for the 6L6GC. Makes my Twin a monster( using quad set of GT KT-66HP hardness-"10").
    I was barley able to get the red glow out of the plates when biasing with those!
  5. Treena Foster

    Treena Foster Active Member

    Jul 4, 2003

  6. Tommy P.

    Tommy P. Well-Known Member

    Jan 10, 2002
    Thanks Treena, thats another good link.
    I've bought some hard to find power tubes from them for my old Gretch 6156 amp.
  7. clay

    clay Guest

    Thanks to everybody for hte help, clay.

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