Marshall JTM30 Schematics

In 1994, Marshall introduced the JTM30 amps, which were discon­tinued in 1997. These amps were built as a 2×10″ combo or as an 1×12″ combo.

JTM310, 30W 2×10″ combo

These amps were in pro­duction from 1994 to 1997. It used three ECC83 tubes and two Sovtek 5881 tubes. It offered 2 footswitchable channels with a shared EQ section, a spring reverb, a series FX loop and a Speaker Emulated output.

These amps were fitted with two Eminence Marshall Heritage LE10-508 8Ω speakers connected in series.

Owners manual for the JTM30.

Schematic of the pre amp PCB, JTM3-60-02 Issue 4, (Marshall, 1995).

Schematic of the power amp PCB with 3x ECC83 & 2x 5881, JTM3-61-02 Issue 4, (Marshall, 1995).

Photograph of a JTM310 combo (thanx to Rolando).

Close up photograph of the JTM30 logo (thanx to Rolando).

JTM312, 30W 1×12″ combo

These amps were in pro­duction from 1995 to 1997. It used three ECC83 tubes and two Sovtek 5881 tubes. It offered 2 footswitchable channels with a shared EQ section, a spring reverb, a series FX loop and a Speaker Emulated output.

These amps were fitted with a 12″ Celestion Marshall G12 Heritage T4612 16Ω (S403) speaker. The JTMC12 exten­sion cabinet matches nicely with this amp.

Owners manual for the JTM30.

Schematic of the pre amp PCB, JTM3-60-02 Issue 4, (Marshall, 1995).

Schematic of the power amp PCB with 3x ECC83 & 2x 5881, JTM3-61-02 Issue 4, (Marshall, 1995).

Photograph of a JTM312 combo.

JTMC12, 70W 1×12″ 16Ω extension cabinet

These JTMC12 extension cabi­nets were fitted with a 12″ Celestion Marshall G12 Heritage T4612 16Ω (S403) speaker. This JTMC12 exten­sion cabinet is sometimes confusingly also referred to as a JTMC112 cabinet, but as far as I know a JTMC112 cabinet doesn’t exist.

Owners manual for the JTM30.