Ampeg J-20 Jet

Model/Circuit Number: Ampeg J-20 Jet
Years of Production: 2007 – 2009
Era: Diamond Blue
Configuration: Combo
Controls: Chrome front facing w/ white screen labels numbered 1 through 10
Knobs: Black oven type with white pointers

  • Front: Normal In, Bright In, Volume, Tone, red dome pilot, Speed, Intensity, Standby switch, Power switch
  • Rear: 1.5A fuse, Int speaker jack, Ext speaker jack, Footswitch jack


  • Dimensions: 17.5″ H X 20″ W X 9.75″ D
  • Handle: Black leather dog bone style
  • Feet: Round black rubber
  • Corners: Bottom, nickel plated

Covering Material

  • Tolex/Tweed: Blue diamond checkered Tolex
  • Grill Cloth: Silver/black

Logo: Cabinet mounted silver rocket style
Weight: 25 lbs.
Speakers/Load: 1 x 12″ / 8 ohms

  • Speaker Model: Ampeg Special Design 12″ alnico
  • Effects: Tremolo
    Watts: 20 Watts

    • Pre amp: 1.5 X 12AX7 preamp, 0.5 12AX7 tremolo oscillator, 1 X 12AX7 phase inverter
    • Power: 2 X 6V6GT

    Bias: Fixed
    Rectifier: 1 X 5AR4


    7 thoughts on “Ampeg J-20 Jet

    • July 24, 2014 at 7:40 am

      Heavily based on the Fender 6G3 Brown Deluxe. Basically just had one set of controls for both channels.

    • March 17, 2015 at 6:42 pm

      Crazy dirty, loud little bugger. I’m happy with the stock speaker. Nice round bottom end. P90s through this amp have a piano like quality.
      Beg, borrow or steal…….just get one.

    • January 6, 2018 at 9:19 am

      I would like to put to together a band this year 20018 I so I would like to know the price of ampeage J 20 jet so like know A,S.A.P PLEASE

    • January 6, 2018 at 9:33 am

      i would know the price of of the AMPEG J 20 ASAP BECAUSE I WOUL LIKE TO KNOW A.SA.P

      • July 31, 2019 at 7:34 am
        Permalink will have some listed. Anywhere from $400 to $700 depending on condition, the market, and the seller.

    • July 31, 2019 at 7:31 am

      I own this amp and it’s awesome. Lowering the value of the bypass capacitor reduces bass and makes the amp vastly more usable at higher volumes, i.e. it does not “fart out” as much.

    • November 8, 2022 at 8:48 am

      This is a very sweet amp I’ve had about every fender/vox/Marshall and the ampeg j20 jet is at the top of the list. I’m sure that this well kept secret won’t stay a secret for long. And it holds its own against any and all in stock form. I’ve left mine alone other than changing the speaker to a cannabis Rex. By eminence and it gave it a little more room up top , this amp is a sure keeper no matter what your collection is. I have not seen many of these for sale and I see and hear why the ll everytime I plug in to it. I would hate to have to replace it , the only amp that could take its place would be another ampegj20 jet and to all the ampeg j20 owners keep this jewel on the down low. And keep it locked up this amp will eventually be sought after no doubt


    Leave a Reply

    Your email address will not be published. Required fields are marked *