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Back from the dead...

Discussion in 'Shock Brother's DIY Amps' started by Preacher, Feb 17, 2021.

  1. Preacher

    Preacher Friend of Leo's

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    Many moons ago I picked up a little Epiphone Valve Jr. head to mess around with. This had to be back in the early 2000's and I wanted a little tube amplifier to satisfy that want.

    But I am also one to not leave anything alone, so I decided to do some minor modding from the information I found on the webs regarding trace issues and such. I added a three band EQ, decided to scrap the old PCB and made a new eyelet board and rewired the whole thing. Eventually I got sound out of it but the EQ was bad and not really useable and the JR went onto the shelf for other options.

    A few weeks ago I was playing around on the 5E3 and was really wishing I had a little less volume. So I started researching a volume cut on the 5E3 but then realized I finally got it where I liked it and did not want to mess with it. It was then I remember the unloved JR on the shelf in the garage.

    I went and dug the JR out, the face all cut up with the multiple holes for the 3 band EQ and the extra hole for the standby switch I was going to add (yeah I was not very amp savvy back then). I checked out the guts, oh my, I need to do some lead trimming on that unit!!

    Anyway, long story not so short, I re-soldered a bunch of joints, shortened some leads, ditched the 3 band EQ in favor of a single tone knob, and bought some new JJ tubes for it. After that I used robrob's start up procedure with a LBL and it did not appear to have any issues. Plugged it into a 10" stand alone cabinet with a Jensen Special speaker I built years ago and now I have low watt tube bliss.

    I can't believe how good this little thing sounds so far as such quiet volumes.

    I made a hand written face plate to cover all the surgeries this little thing endured in the past. I will probably update that later on with an engraved plate of some sort but for now it will just get played.

    IMG_3072.jpg
     
  2. robrob

    robrob Poster Extraordinaire Ad Free Member

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    Very cool. It's a time tested and simple circuit that just works.
     
  3. Preacher

    Preacher Friend of Leo's

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    Agreed and it cost me nothing to get running. I salvaged the face plate from some packing materials my wife got on a jewelry armoire I bought her. The width was just right!

    Now I am thinking I need to build a champ unit... but first I need to finish the 18Watt unit on the shelf in the garage.
     
    robrob likes this.
  4. gigante

    gigante Tele-Meister

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    what did you use for the tone circuit?
     
  5. Preacher

    Preacher Friend of Leo's

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    I pretty much copied the tone control on my 5E3 and added it to the schematic, It looks like this.

    [​IMG]
     
    gigante likes this.
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