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SWR Bass 750 Loosing power

Discussion in 'Amps and Cabs [BG]' started by iriegnome, Dec 6, 2005.


  1. Dec 6, 2005 #1
    iriegnome

    iriegnome Bassstar style Supporting Member

    Nov 23, 2001
    Kenosha, WI 53140
    Well, I have had my Pre-Fender Bass 750 for 5 years. It has been in a rack since it was new. Never pulled out of the rack. I baby my stuff. In the last couple of weeks, I have noticed a pretty great decrease in power and in performance of the head. Could this be my Pre-Amp Tube going bad? Over the last 5 years we have averaged practice twice a week and played probably 300 shows. I always take the time to cool down the amp and I always carry my own gear. :help:
     
  5. Nov 19, 2006 #2
    KirkW

    KirkW

    Apr 16, 2006
    Casco, ME
    I'd try replacing the 12AX7 tube. All tubes wear out over time. If that doesn't do the trick, there is a possibility of a blown output transistor. SWR usually uses multiple transistors in parallel to achieve the required power output. It's possible the amp can still run with some blown transistors. There is also the possibility of a power supply problem. An amp tech can check it out.
     
  10. Nov 19, 2006 #3
    Ale

    Ale

    Jul 5, 2006
    Europe
    Endorsing Artist: IGiG Cases
    Could be you ears to , from playing to loud :D
    Seriously , try to replace your tubes. How long was it you changed tubes ?