What is the difference between EZ80 and EZ81?

Discussion in 'Amp Central Station' started by Bill Ashton, Jan 17, 2005.

  1. Bill Ashton

    Bill Ashton Tele-Afflicted Gold Supporter

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    I just discovered that my '64 (?) Vox AC-4 has been running with a 6CA4 (EZ81) rectifier rather than the EZ80 called for. It gets infrequent use, and over the past six years I certainly haven't had any problems...
    What is the difference between these two rectifiers??
     
  2. Jef

    Jef Tele-Holic

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    The EZ81 can deliver a bit more DC current
    EZ80: 90 mA
    EZ81: 100 mA
    DC current is being drawn by the tubes, it's not 'pushed' by the transformer/rectifier so it's no problem to use an EZ81 in your Vox AC4.

    Jef
     
  3. David Barnett

    David Barnett Doctor of Teleocity

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    Is there any difference in the amount of heater current that the two rectifier tubes draw?
     
  4. Jef

    Jef Tele-Holic

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    Yes, there is:
    EZ81: 1A
    EZ80: 600mA

    Jef
     
  5. Bill Ashton

    Bill Ashton Tele-Afflicted Gold Supporter

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    Thank you, Jef

    Interestingly, when I picked this little jewel up, the power transformer had overheated and spewed melted beeswax all over the insides...you could watch the varnish boil on the transformer when it was running!

    Had a really hard time finding a replacement, and just before cutting the chassis for a new Hammond, I was able to get Mercury Magnetics in California to rewind it...or I should say, Don Butler got them to do it, as this was before they did guitar amp stuff on a regular basis.

    I had just stumbled on the fact of the 6CA4 replacment yesterday and was wondering, thanks again.
     
  6. Jef

    Jef Tele-Holic

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    That seems to be a hot little amp, Bill. De you have some pics?

    Jef
     
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