Fender Super Twin

Fender Super Twin
Schematic(s) super_twin_180w.pdf
Brand:
Era:
Line: ,
Configuration:
Production: ,

Years of Production: 1975 – 1976
Era:
Configuration: Combo
Controls: Black, forward facing w/ white labels
Knobs: Black skirted w/ chrome center, numbered 1 – 10 (EQ knobs numbered -5 to +5)
Faceplate

  • Front: Power Sw, Standby Sw, Pilot Lamp – In, In, Vol, Treb, Mid, Bass, Presense, Bright Sw – 2300 Hz, 1250 Hz, 485 Hz, 235 Hz, 100 Hz – Distortion, Output Level
  • Rear:

Cabinet

  • Dimensions: 20 x 26 x 10½
  • Hardware: Large Chassis Straps 5 5/8”
  • Handle: Black Strap
  • Feet: Casters
  • Corners: Corner Protectors

 

Covering Material

  • Tolex/Tweed: Black Tolex
  • Grill Cloth: Black acoustic foam cloth with white trim

Logo: Grill mounted, raised, chrome & black script
Weight: 95 lbs.
Speaker

Effects: Active EQ, Distortion
~Watts: 180 watts
Tubes

  • Pre amp: 2 x 7025
  • Power: 6 c 6L6

Bias: Fixed with Bias Pot.
Rectifier: Solid State

Comments: Active EQ: 12AU7

8 Responses to “Fender Super Twin”

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  1. Comment by Ruk — July 19, 2011 at 2:07 am   Reply

    Terrible Ted Nugent used these amps into a showman or bassman cab. These buggers are L-O-U-D!!!! And that’s about it. The master volume sounds like ass. I own a non-reverb version of this amp. The RCA 6L6s in it (SIX of them!) are worth about 5x what the amp alone is worth.. Lol. One interesting aspect of the circuit is that the e.q. is parametric, not graphic.

    • Comment by Jeffrobinson416 — November 6, 2011 at 8:55 am   Reply

      yeah i’ve got the non reverb and it took me a while to adjust the sound. I was thinking to let a tech put in a rectifier tube and maybe a switch system to turn on 2,then 4,then 6 tubes if it’s possible.

      • Comment by Morrell, JohnJanuary 19, 2012 at 9:37 am   Reply

        You are better off with the solid state rect as the currents for SIX 6L6s would need at least 3 GZ 34 types (expensive and HOT!). To switch the tubes off in pairs, is simple using mosfet cathode switches controlled by 12v dc – this can provide for LED indicators to show 2, 4 or 6 tubes (or better still, low med or high). You only need to switch off 2 pairs, as one pair will be in circuit at all times.
        You can have separate switches with it’s associated LED over it OR a rotary selector to do the same job. Not that a LED showing the low condition will be on at all times, you are simply adding extra pairs to this ‘normal’ pair. The mosfet types are IRF 680           and are fitted from the cathodes of each pair to ground. Mosfets switch dc very well and are ideal for this application. I have built 4 heavy amplifiers for customers with this very feature. very good for tube life – 6 6L6s burning away for a smallish gig or practice is cutting tube life drastically. IF you have Kevin O’Connor’s book The Ultimate Tone there  is a simple circuit in there.
        Good luck!    Stratman (John)

    • Comment by RobbieNuke — November 16, 2011 at 5:12 am   Reply

      They are graphic, not parametric. Parametric controls not just the boost/cut of a certain frequency (which this amp does), but also the frequency set-point and the band-width (which this amp DOES NOT do). If this were a parametric there would be 12 additional knobs. Why 12 when there are only 5 graphic EQ knobs? Well, the Presence knob is actually the uppermost section of the EQ circuit, just located over on the tone control section (not actually part of the tone circuit as are the Bass/Middle/Treble). Don’t know why they did this since a true Presence control actually adjust the amount of negative feedback from the output transformer… 

      • Comment by Shrigg — December 13, 2011 at 3:21 pm   Reply

        Thanks for your insightful reply. Helps me understand what’s going on with my vintage Fenders (1962 6g6B Bassman and 1979 Princeton non-reverb which I disconnected the negative feedback and found it became AWESOME)

  2. Comment by Alphahophead — September 20, 2012 at 2:28 pm   Reply

    I can’t seem to get the distortion on mine to work. It has the Jack for a foot pedal. Is that the problem? Do I have to have the foot switch?

  3. Comment by oldvintagerules — March 23, 2014 at 6:38 am   Reply

    This amp takes a beating on reviews it seems. Okay, it is loud. There are more controls (more ways to shoot yourself in the foot). The guy that designed it has his own amp company now Rivera. True, some Fenders are better than others. This is NOT a bad amp though. If you can’t get a good sound out of it, you probably don’t know what your doing anyway.

    Pros: Takes pedals well, good clean sound, EQ section is praise-worthy.

    Cons: No reverb, all Twins are heavy.

  4. Comment by Hawkeye — April 9, 2014 at 9:09 am   Reply

    “The guy that designed it has his own amp company now Rivera.”

    Actually, the ST and STR were both designed by Ed Jahns, not Paul Rivera. Rivera didn’t have charge of amp design until 1982.

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