Fender Prosonic

Schematic(s) prosonic.pdf
Production: , , , , , , , , , , , , , ,

Model/Circuit Number:
Years of Production:
1996 – Present
Configuration: Combo
Controls: Black, forward facing w/ white screened labels, controls numbered 1-10
Knobs: Black Pointer

  • Front: In, In, Channel Sw, Vol, Gain 1, Gain 2, Treb, Bass, Mid, Master, Reverb – Pilot Lamp
  • Rear: Rectifier Sw, Power Sw, Standby Sw, Ex. Speaker Jack, Footswitch


  • Dimensions: 18½ x 24 x 10½
  • Hardware: Medium Chassis Straps 4 5/8”
  • Handle: Black strap handle or black leather handle w/ footman loops
  • Feet: Glides
  • Corners: Corner Protectors


Covering Material

  • Tolex/Tweed: Snakeskin, Red, Sea-foam green lizard skin, and black Tolex
  • Grill Cloth: Silver Sparkle Grill Cloth

Logo: Grill mounted, flat, chrome & black script
Weight: 54 lbs.

Effects: Reverb, Channel Switching
~Watts: SS Rect/AB: 60 Watts ; Tube Rect/AB: 50 watts; Tube Rect/A: 30 watts

  • Pre amp:
  • Power: 2 x 5881

Bias: Fixed Bias
Rectifier: Class A/5AR4, Class AB/5AR4, Class AB/Solid State (switchable)

Comments: The Prosonic includes a switch for changing the operation class of the amplifier. (see Rectifier)

14 Responses to “Fender Prosonic”

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  1. Comment by Prosonic Fan — November 18, 2011 at 11:55 am   Reply

    Prosonic discontinued in 2002. Several models were made in the Custom shop before assembly line mass production.

    You know you have a Custom Shop Prosonic if it has four things.
    It will say “Fender Musical instruments” under the jewel lamp.It might say “Fender Custom Amp Shop” on the tube diagram inside the amp.The serial number that starts with LO instead of CR. It has a green jewel light (not a red one).

    • Comment by Don — May 20, 2016 at 8:08 am   Reply

      I know this is a late reply, but just read this post today (5/20/16) and wanted to note the differences in my Prosonic amps.
      I have one in the red snakeskin that has an “LO” serial number, “Fender Amp Custom Shop” on the tube chart label, and “Professional Tube Amplifier” on the front plate under the light jewel.
      I have a seafoam green one that has an “LO” serial number, “Fender Amp Custom Shop” on the tube chart label, and “Fender Musical Instruments” on the front panel under the light jewel.
      I have a black tolex one that has a “CR” serial number, no mention of Custom Shop on the tube chart label, and “Professional Tube Amplifier” on the front plate under the light jewel.
      Just found that interesting that none of the three of them matched with respect to those parameters.
      In side-by-side comparisons of my 3 amps, all using matched Groove Tubes in power section and Groove Tube pre-amp section, (subjective to variances introduced by tube age, etc), they sound almost exactly alike at the A and AB rectifier settings. However, on the SS rectifier setting, both the ones with the Custom Shop indicated on the tube chart label sound ever so slight smoother than the black tolex one that does NOT have the Custom Shop indicated on the tube chart label. Note again that both the “custom shop” labled ones have different serial number/factory/faceplate designations.
      Just observations to share and digest.
      Having said all of that, I like my Prosonics better than any amp I have ever owned, played, or heard. I own approx 25 Fender, Ampeg, Univox, Gretch, Marshall, etc. amps, and for my likes, nothing matches a Prosonic.
      As much of a “Prosonic Fan” I am, I have found my recent attention stuck on my new Fender Super Champ X2. What a fun little amp!!

  2. Comment by Michael Bauer — September 28, 2013 at 7:52 pm   Reply

    Just to set the record straight, the Prosonic was designed by Bruce Zinky of the Custom Shop, but none of these amps were actually built there, nor were they sold as Custom Shop amps. The “LO” prefix to the serial number indicates that the amp was made at the old Sunn Amp factory in Lake Oswego, OR. Late, production was moved to Corona, and those amps are indicated by the prefix “CR.” The Lake Oswego amps are supposed to have better-quality components than the later models, though. Fender is said to have made modifications to Zinky’s original design, but with a few circuit and tube mods, these amps go from good to really great!

    • Comment by Barry Amundsen — October 23, 2013 at 6:17 pm   Reply

      Mine is loudest when the rectifier switch in back is on number 1 labeled “Tube” and quietest when switched to 3 labeled S.S. AB2. Isn’t that backwards from what it is supposed to be? In the 2 middle position it is mid loudest too.

  3. Comment by Peter Smith — June 11, 2014 at 3:01 am   Reply

    These amps are sensational, especially the early “LO” series. Highly underrated and highly desirable IMO. The gain channel is amazing with cascading gain and compression. The clean channel is more like an AC30 sound, a little darker than traditional fender clean channels. These amps are becoming rarer and collectable as the word gets out.
    If you can get a red snakeskin or sea foam green custom shop model, (only 500 made) go for it, you will not be disappointed.

  4. Comment by Colleen — December 11, 2015 at 11:12 am   Reply

    My friend just purchased a sea foam green lizard skin amp. The backplates that protect the tubes are missing. Is there somewhere I could get replacements manufactured or ordered?

  5. Comment by Ontol — November 2, 2016 at 2:01 pm   Reply

    I love my “new” Prosonic combo. I want to use it with my Marshall SE-100, but it takes 8 Ohm input. The Prosonic’s output is 16 Ohms. Is that right? Is it possible to add a switch, like the head version, to choose between different impedances?

    • Comment by rik — December 6, 2016 at 5:55 pm   Reply

      Ontol….total output on combo is 16 ohms…however, you can use a dummy plug to plug into either the main speaker or ext speakr jack…that divides the jacks into 8 ohms each…plug your 8 ohm speaker into the remaining jack..I have an 8 ohm setup with two texas heat speakers that I use with mine…

    • Comment by Dan Gerous — May 23, 2017 at 1:30 pm   Reply

      When usien 8 Ohm Speakers –
      2×8 in Series = 16 Ohms
      2×8 in Parallel = 4 Ohnm

  6. Comment by Dan Gerous — May 23, 2017 at 1:30 pm   Reply

    When using 8 Ohm Speakers –
    2×8 in Series = 16 Ohms
    2×8 in Parallel = 4 Ohnm

  7. Comment by Dan Gerous — May 23, 2017 at 1:31 pm   Reply

    When using 8 Ohm Speakers –
    2×8 in Series = 16 Ohms
    2×8 in Parallel = 4 Ohms

  8. Comment by Rob — July 8, 2017 at 7:33 pm   Reply

    The prosonic in my opinion is a turdcake. I own a beautifully modded Vibrolux (1980-81). Side by side there’s no comparison. I’ve probably owned about 10 or so different amps. The best being my Vibrolux, followed by a Carvin, etc. Although the Prosonic is a turdcake stock, I do believe it could be modded to be a quality, gig-worthy amp. But considering it’s weight, to me it is not worth the trouble to mod. This amp was given to me–myself, I would have never bought it. Needs a lot of fixin’ up!

  9. Comment by ChuckJuly 12, 2017 at 11:47 am   Reply

    I love how people cry, whine and defame a great Fender high gain amp.^^^^ It’s possible that this isn’t the amp for you! I own 3 of these amps, 2 heads and one combo. I’ve been through all sorts of amps including vintage to modern, a Friedman , Mesa Express 5:50+, Super, JCM, and others. I tried to like the Super Sonic combo, but ended up with my used prosonic combo instead. Very happy and the verb sounds great.
    I sold all of those other amps and keep playing the Prosonic. These amps require time and patience to attain your sound. Tiny increments on the active eq shapes tone, along with which class you choose. I use all mine stock, and they preform great on stage and recording. They sound great simply plugged in without a bunch of pedals in the way. The gain is over the top past a certain point, but it’s up to the user to figure it out, whine about or sell it. I personally figured it out in a good way, and it’s ……….
    I have both a red snake skin LO model along with 2 CR models. The tonal difference is negligible to me. And- a post above is correct, None of these were ever Custom Shop amps. Only CS designed by Zinky.

    The Combo weight according to my Fender manual says 48 us pounds. To clear up some strange post above, the combo is wired to 16 ohm load. When using an extra external cab with the internal speakers using the external speaker jack, it taps to an 8ohm load (all in my manual). Granted you are smart enough to use a 16 ohm external cab! Read up on mis matching impedance.
    Bottom line is, the Prosonic is a very unique and special high gain amp that isn’t for everyone. The community that has these rarely will sell them, so that should tell you something. The price will only go up on these so I’m hoarding mine as long as I can carry them. People who choose to slam and defame this special amp clearly have not chosen the correct amp for the music, or simply can’t figure it out. It’s a high gain rock amp, so if that’s not your thing, move along quietly. Savvy?

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