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OLDAMPS
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Musicman RP 112 Sixty-Five

Picture
RP stands for reverb phasor.  To my knowledge this is the ony amp that has a phasor effect built in.  You could actually freeze the phase at any point through it's sweep and create the most unique voicings.  It is a hybrid amp, having a solid state preamp and 2 EL34L power tubes for output.  To get 65 Watts the HT is very high and ordinary EL34s just won't do. You have to us the higher rated ones.  I can't remember the exact voltage but 700 - 800 VDC on the plates.  Leo Fender, what a genius!

This was my first proper valve amp I bought and it worked and sounded good except the reverb was dead.  Being a 70s amp, it certainly needed a recap.  The previous owner didn't use it for guitar but to play taped music outside for Morris Dancing.  It had been looked after, though there was some surface rust on the outside metal parts.

The phono wires on the reverb pan needed replacing and the reverb driver chip was missing.  I discovered what looked like a water stain on the main pcb and it looked like someone had taken the reverb chip to get the amp working again.  Probably a sudden downpour.  The rain probably got in down one of the top handle bolts

A visit to my local shop and a 50p replacement got the reverb sounding just as it should.

Lots of really good info here on these amps and how to service them.  http://www.musicmanamps.com/

I replaced some of the old preamp chips (dual op amps) with lower noise ones with better RF noise rejection.  I also experimented with some equivalent dual op-amps recommended by others until I got the best distortion sounds.  The solid stete preamps are super quiet making these fantastic recording amps.

Eventually I had to sell it.  The guy plugged in a Telecaster equiped with P90s and it sounded so good I almost asked for it back!! 

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
  • Filmosound
    • Filmosound Guitar Amps
    • Filmo New Style
    • Filmonator Prototype
    • Testimonials
  • 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
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      • Vox AC 50 Repair and Overhaul
  • Blog
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