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OLDAMPS
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Hotpup 5F1  Champ

Picture
This is a bit of a mystery really, but I believe it's a home built project in a Harley Benton cabinet.  It was a bargain, but had an unacceptable hum, and a crappy, farty, elliptical speaker.  I spent many hours trying to solve the hum problem, rewiring the heaters, installing an artificial centre tap and using screened input cable.  None of this made any real difference.  In the end, as an experiment, I disconnected the feedback wire from the OT and the hum all but disappeared. It also really improved the tone and touch sensitivity.  Later I added a cathode bipass cap to the 1st stage of the 12ax7 and the hum was gone! 

The first speaker I tried was an old 10" Celestion I had kicking around.  This boosted the volume, but too much bass.  Next, it was hooked up to a lovely old 12" Bell & Howell cinema speaker which sounded awesome clean but a bit too brittle to punish.  A hunt on Ebay and I had a vintage alnico 10" taken from a Decca radiogram.  Now I think it has a really good tonal balance.  I added a speaker jack under the chassis to hook up different speakers and a three way mini toggle on the front that gives it a fat boost, a mid boost or no boost.  I may add 2 more jacks for the 8 and 16 Ohm taps at some point.

Champs are extremely versatile, great for jamming and recording, and considering the asking price of over £900 for even the reissues, I think I got a great deal.  I also use it to test pre-amp valves.
Musicman RP 112 Sixty-five            JMI Vox AC 10
Elpico AC52                                     Carlsbro CS 60
Filmosound Amplifiers                      Hiwatt Lead 50R
Lab Series L2                                   Burns
Lab Series L5                                   Fender Twin Reverb
Selmer Constellation 20                   Fender Musicmaster Bass
Selmer Treble & Bass Mk 2              Impact 60
Schaller KV40                                   Northcourt 50
Fender 5F1 Champ                           RSC Bass Major
Traynor YGL 3 - Mark 3                     Mystery Amp
Watkins Westminster                         Denco 912-Plus
Denco 912-Plus                                 Interesting Waveforms
Wem Dominator Mk 3                        Mullard 5-10
Wem Watkins Copicat Mk 3               Decca Amp
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  • Repairs & Servicing
    • Guitar Amp Service & Repair
    • Business Card
  • Contact
  • Amps & Stuff
    • WEM / WATKINS >
      • Watkins Clubman
      • Watkins Westminster
      • Watkins Westminster Mk 9
      • WEM Control ER15 No. 1
      • WEM Control HR 30
      • WEM Dominator Mk3
      • Watkins Copicat Mark 2
      • Wem Watkins Copicat Mk 3
      • Wem ER100
      • Wem PA100
    • Baldwin Burns Amplifier
    • Carlsbro CS 60 PA
    • Elpico AC52
    • Leo Fender >
      • Fender Concert Repair
      • Fender Twin Reverb 1977 Silverface
      • Fender Twin Reverb 1972 Silverface
      • Fender Blues Deluxe
      • Fender Musicmaster Bass Amp
      • Musicman RP 112 Sixty-five
    • Gibson >
      • Gibson Mercury
      • Gibson Falcon GA19RVT
      • Lab Series >
        • Lab Series L2 Service and Repair
        • Lab Series L5 100W Combo (Gibson/Norlin)
    • Hiwatt Lead 50R Combo
    • Marshall >
      • Marshall Artiste
      • Marshall Superbass Mk2 100W Head and Cab Service Repair
    • Miscellaneous Amps >
      • Harmony H307x
      • Hotpup 5F1 Champ
      • Impact 60
      • Mystery Amp
      • RSC Bass Major
    • Orange >
      • Orange OR120 1970s Service and Repair
      • Orange TH 30 repair
    • Schaller KV 40
    • Selmer >
      • Selmer Constellation 20
      • Selmer Treble & Bass Mk 2
      • Selmer T&B 50R SV
    • Traynor YGL 3 Mark 3
    • Tripletone Amp Conversion
    • VOX >
      • Vox AC 10 (JMI)
      • Vox AC 30 TB Restoration
      • Vox AC 50 Repair and Overhaul
  • Blog
  • Other
    • Marconi C10A radio
    • Interesting Waveforms