JMT45 Mk II (2)

Marshall (Brand), Marshall, J & T, (Musical Instruments) Ltd.; Hanwell & Bletchley

Daten
Forum
Bilder
Sammlungen

  • Jahr
  • 1963–1966 ?
  • Kategorie
  • NF-(Niederfrequenz-) Verstärker oder -Mixer
  • Radiomuseum.org ID
  • 356651

 Technische Daten

  • Anzahl Röhren
  • 6
  • Hauptprinzip
  • NF-Verstärkung
  • Wellenbereiche
  • - ohne
  • Spezialitäten
  • Gitarrenverstärker
  • Betriebsart / Volt
  • Wechselstromspeisung / 230 Volt
  • Lautsprecher
  • - Dieses Modell benötigt externe(n) Lautsprecher.
  • Belastbarkeit / Leistung
  • 45 W (Qualität unbekannt)
  • Material
  • Leder / Stoff / Plastic / Segeltuch über div. Material
  • von Radiomuseum.org
  • Modell: JMT45 Mk II - Marshall Brand, Marshall, J &
  • Form
  • Tischgerät-gross, - Querformat (breiter als hoch oder quadratisch).
  • Bemerkung

  • Introduced shortly after the initial JTM45 Offset release in 1963

    Key Changes from Original JTM45:

    • Wider input jack spacing
    • Elimination of the Bassman-style polarity switch on the front panel
    • "JTM 45 MK II" branding added to the front panel

    Front Panel:

    • Aluminium or white plastic construction
    • Controls (left to right): Presence, Bass, Middle, Treble, High Treble/Loudness 1, Normal/Loudness 2 (all labelled 0-10)
    • Four instrument inputs: two "High Treble" (channel 1) and two "Normal" (channel 2)
    • Chrome baton power and standby switches
    • Round amber indicator light

    Rear Panel:

    • Single speaker cable socket (for use with 16 ohms speaker cabinet)
    • Bulgin power cable socket
    • 2A fuse

    Circuit:

    • Two KT66 power valves (switched from original 5881/6L6)
    • One GZ34 rectifier valve
    • Three ECC83 preamp valves (including one phase splitter)
    • Radiospares RS De Luxe output transformer (30 watts maximum rated output)
    • 45 watts RMS power rating
    • Perforated Tufnell circuit board

    Chassis:

    • 2½-inch aluminum chassis with external cabinet anchors

    Cosmetics:

    • Black Tolex cover
    • Two-tone black-and-white "sandwich" front
    • Gold front strip
    • Metal "coffin badge" with red-on-silver capitalized Marshall logo
    • Four original black-plastic vee knobs
    • Leather handle

    Model Variants (introduced 1965):

    • PA version (model 1985)
    • Bass version (model 1986)
    • Lead version (model 1987)
    • Organ amplifier (model 1989, added later)

    Production:

    • Produced from 1963 to early 1966
    • Phased out with the introduction of 50-watt designs featuring EL34 power valves and solid-state rectification

    The JTM45 Mk II represented an evolution of Marshall's first amplifier, refining the design and establishing the foundation for the company's future iconic models.

  • Autor
  • Modellseite von Gary Cowans angelegt. Siehe bei "Änderungsvorschlag" für weitere Mitarbeit.

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