• RE: M3 Line board 1 x 5687 and 1 x ECC82 - CaBong 12:03:06 11/18/10 (5)
  In Reply to: RE: M3 Line board 1 x 5687 and 1 x ECC82 posted by Tubeheadz on November 18, 2010 at 01:48:48

  I have the hardware board. Is the circuit still the same?
  

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  • RE: M3 Line board 1 x 5687 and 1 x ECC82 - CaBong 15:59:47 11/18/10 (4)
    In Reply to: RE: M3 Line board 1 x 5687 and 1 x ECC82 posted by CaBong on November 18, 2010 at 12:03:06

    The M3 Mk III circuit is the same as the M3 kit which is the same as M3 MK2.
    Except that M3 kit's R1 use 470k and the M3 MKIII uses 1M for R1.
    V1(a) will the half of the 12AU7 and the V1(b) is half of the 5687.
    

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    • RE: M3 Line board 1 x 5687 and 1 x ECC82 - Bambadoo 11:42:53 01/04/11 (0)
      In Reply to: RE: M3 Line board 1 x 5687 and 1 x ECC82 posted by CaBong on November 18, 2010 at 15:59:47

      Is this really the only difference?
      
      Sincerely.
      

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    • RE: M3 Line board 1 x 5687 and 1 x ECC82 - Tubeheadz 01:04:34 11/19/10 (2)
      In Reply to: RE: M3 Line board 1 x 5687 and 1 x ECC82 posted by CaBong on November 18, 2010 at 15:59:47

      Exactly.... so now you need to rewire the signal path according to the new M3 circuit. Instead of looking at the lineboard as as a stereo image with each tube used discreetly by one channel in two gain stages... now see it as two stages where the signal for each channel goes through the respective triodes of the first tube, and then through the second tube. Draw it out on a piece of paper.
      
      Enjoy.....
      

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      • RE: M3 Line board 1 x 5687 and 1 x ECC82 - CaBong 13:06:53 11/19/10 (1)
        In Reply to: RE: M3 Line board 1 x 5687 and 1 x ECC82 posted by Tubeheadz on November 19, 2010 at 01:04:34

        Thanks!
        I guess I will use a piece of plywood to hardwire the new line board. (Just like the new M6/M8) It's easier.
        

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        • RE: M3 Line board 1 x 5687 and 1 x ECC82 - horny 04:18:08 11/20/10 (0)
          In Reply to: RE: M3 Line board 1 x 5687 and 1 x ECC82 posted by CaBong on November 19, 2010 at 13:06:53

          It is not ordinairy plywood what AN used.
          It is panzerholtz or delignit these are bulletproof panels also used in the transformer building
          the material is also used in formula 1 racing cars.
          

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