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How much filtering for this amp..

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  • #1

    How much filtering for this amp..

    SO, I have a little 8" Combo I used some years ago as a test amp.. I've decided to use the Crunch Channel of my JCA50 as the latest version (with a few tweeks) Last weekend I did some modding to the JCA and have it sounding to my liking.

    It (Crunch) has enough gain for practicing and it will fit into the amp as I only have 3-9 Pin spots to make it happen. 2-12AX7's a 1-EL84 Cathode biased is the recipe.. I've sourced a PT and I'll even put a little 10H Choke in there!


    https://www.hammfg.com/part/269EX

    https://www.hammfg.com/part/157J

    So as far as filtering, I don't think I need everything per the schematic as I'm only running 1 humble EL84, but I want it to be as tight as the real amp.

    What would you do??


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  • #2
    Tight? Switching from push pull to single ended means you are going to class A. Push pull stages have a natural hum cancellation effect. Single ended amps do not. Thus you need MORE filtration, not less.
    Education is what you're left with after you have forgotten what you have learned.
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    • #3
      Okay, how much?? LOL They reason is only for lack of real estate.The amp was a Crate V5. It originally only had 1-12AX7 and an EL84..
      Here are some old pics from when I did the conversion.. I have since put it through numerous revisions..
      3 Photos

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      • #4
        Here's what it looks like now. I haven't looked at this thing in a while..
        I think I figured out just by trial and error that more filtering worked.. Look at all of this..

        1 Photo

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        • #5
          you need a wooden chopstick, brotha'
          If I have a 50% chance of guessing the right answer, I guess wrong 80% of the time.
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          • #6
            It's been in the closet for years.. But thanks. I think I got this..

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            • #7
              Originally posted by leadfootdriver View Post
              So as far as filtering, I don't think I need everything per the schematic as I'm only running 1 humble EL84, but I want it to be as tight as the real amp.

              What would you do??
              I'd always use a pi filter on a single ended amp.

              And I'd change those 47u input caps to 47n

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