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1968/1969 Marshall JMP Model 1992 Super Bass with 1935 and 1935A cabinets in very good condition.

Purchased together in Maxwell's music shop in Woking, Surrey in 1969.

Carefully kept and used. The only known change to the amplifier's fixed circuit is a replacement of the Bulgin mains socket with an IEC.

The amplifier was serviced by Marshall Amplification on 12th December 2022. The valves have been tested on an AVO VCM MKIII and test book value or close.

The 1935 cab was used only a handful of times since 1969 and was otherwise kept in storage under its vinyl cover. The quality of the basketweave fret cloth is exceptional. The cabinet contains two 1968 Celestion T1511s with 34 102 014 Pulsonic cones and two 1967 Celestion T1281s with 39 102/014 Pulsonic cones. The cones on the T1511s have not been broken in yet. The reason two T1281s have been installed in the cab and G12M labels applied to the magnet covers is uncertain although it's considered likely these are the labels from the stock speakers. One of the T1281s has been cleaned internally by R&CC to correct a voice coil rub. This means the dust cap has been lifted from the cone, the spider lifted from the frame, the chassis and coil gap cleaned, the cone re-centred, the spider re-glued and the dust cap re-glued. The same process was undertaken on the two T1511s as a preventative measure to correct lifting spiders.

The 1935A cab was used regularly for gigging since 1969. This is reflected in the exterior condition of the fret cloth and covering. There are patches of missing vinyl to the rear panel and base. The cabinet contains four 1968 Celestion T1511s with 34 102 104 Pulsonic cones. One of the speakers has been cleaned internally by R&CC to correct a voice coil rub. The same process was undertaken on two other speakers in this cabinet as a preventative measure to correct lifting spiders.

Provenance and technical details are available on request.

Comes with:

  • Service records
  • PAT certificate
  • A PAT certified IEC cable
  • A Bulgin socket with brass domed head machine screws (plus nuts and washers)
  • A custom made 12ft mains lead with Bulgin terminal and brown MK mains plug
  • A custom made flight case with three-compartment base and two part lid. The dimensions are 124cm x 100cm x 95cm and the loaded mass is 167kg

Shipping costs are approximate; please contact us for an accurate quotation for delivery to your location.

Equipment of this age and type changes as time goes on; resistor values drift, electrolytics fail, basketweave fret cloth turns to tan and speaker adhesive dries and crumbles. This is a rare opportunity to own a Marshall 100W Super Bass plexi full stack retaining an extraordinary amount of its original spec and character.

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Listeda year ago
ConditionVery Good (Used)
Very Good items may show a few slight marks or scratches but are fully functional and in overall great shape.Learn more
  • JMP 1992 Super Bass 2-Channel 100-Watt Guitar / Bass Amp Head
  • Black
  • 1967 - 1975
Made In
  • United Kingdom
  • Tube
  • None


Warwick, United Kingdom
Joined Reverb:2023

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