Marshall 2203 100k feedback resistor and 8ohm tap

Discussion in 'Amps and Cabs' started by lespaul6, Feb 21, 2012.

  1. lespaul6

    lespaul6 Senior Member

    Messages:
    1,335
    Joined:
    May 6, 2007
    anybody connect the negative feedback wire to the 8ohm tap instead of the 4ohm (stock). With EL34's it seems to sound really nice and tight with a just little sag. any opinions?
     
  2. john l

    john l Member

    Messages:
    2,025
    Joined:
    Feb 5, 2010
    Location:
    OC Socal
    I could be wrong but if your amps running EL34s thats the tap your supposed to use, you would use the 8ohm tap if you ran 6550s.
     
  3. lespaul6

    lespaul6 Senior Member

    Messages:
    1,335
    Joined:
    May 6, 2007
    I thought 6550's would need less negative feedback using the 4ohm tap to help them give a little whereas el34's will distort quicker and work better with a little more neg feedback 8ohms? no?
     
  4. cisspcism

    cisspcism Member

    Messages:
    2,080
    Joined:
    May 6, 2008
    Location:
    Downers Grove, IL
    The lower the ohm tap the less negative feedback in the loop.
    So 4 ohms tapped would be louder, gainer, rawer as there is less feedback.

    and 16 ohms would be more softer and seem looser(even though you are dampening excursion more this way)
     
  5. Roe

    Roe Member

    Messages:
    6,953
    Joined:
    Jul 12, 2005
    Location:
    tromsoe, norway
    actually, less negative feedback -not more - is usually preferred with 6550s. 100k@4 is about as low as you wanna go anyway
     
  6. Roe

    Roe Member

    Messages:
    6,953
    Joined:
    Jul 12, 2005
    Location:
    tromsoe, norway
    16 ohms have tighter bass and broader bandwidth
     
  7. lespaul6

    lespaul6 Senior Member

    Messages:
    1,335
    Joined:
    May 6, 2007
    So what do you think about using the 8ohm tap with el34's and the 100k resistor? is this so much different than the 4ohm?
     
  8. Bruce Clement

    Bruce Clement Gold Supporting Member

    Messages:
    1,046
    Joined:
    Jan 4, 2010
    Location:
    San Francisco
    You can run just about any amount of NFB you wish. It's a matter of taste. I personally like lots of NFB on Marshalls. (Try 27k on 16 ohm tap - a la JTM45 - and dig the smoothness.)
     
  9. lespaul6

    lespaul6 Senior Member

    Messages:
    1,335
    Joined:
    May 6, 2007
    yeah, that might be too clean for me!
     
  10. Roe

    Roe Member

    Messages:
    6,953
    Joined:
    Jul 12, 2005
    Location:
    tromsoe, norway
    I prefer 8 ohms, although the best solution is a resistor in series with a pot so that the NFB is adjustable. I also like lots of NFB like the early amps had.
     

Share This Page