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ELECTRIC TUBE AMPLIFIERS: JTM 45 SERIES

This was Marshall's first line of amplifiers released in 1962. Since this was Marshall's first attempt at mass producing amplifiers, the cosmetics changed quite frequently. When parts would run out, they would just go out and buy whatever was handy. For a series of amps there are many different looking models that bear the same name. The electronics didn't change much except for small tweaks and occasional tube differences. JTM stands for Jim and Terry Marshall; Terry is Jim's son. The JTM-45 combo amps are known as the Bluesbreaker models and are listed under the Bluesbreaker Series.

Models (8)

JTM-45 (NO MODEL NUMBER) 45W LEAD

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- 45W, head unit only, lead guitar application, tube chassis, preamp: 3 X 7025, 2 X 6L6, GZ34 rectifier, two channels, front white control panel, 4 inputs, typically six knobs (p, b, m, t, high t (loudness 1), normal (loudness 2) black leather covering, brown grille, mfg. 1962-64.
The first Marshall amplifier, very desirable and hard to find. The offset chassis is very rare.
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JTM-45 (MODEL 1963) 50W PA

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- similar to the JTM-45 lead except Super PA version, 50W output, four channels, eight normal inputs, eight knobs (p, b, m, t, v1, v2, v3, v4), bears the name MK III on front panel, mfg. 1965-66.
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JTM-45 (MODEL 1985) 45W PA

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- similar to the JTM-45 lead except PA version, 45W, output, bears the name MK II, mfg. 1965-66.
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JTM-45 (MODEL 1986) 45W BASS

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- similar to the JTM MK II except in bass version, high treble and normal channels, mfg. 1965-66.
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JTM-45 (MODEL 1987) 45W LEAD

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- similar to the JTM-45 MK II except in lead version, high treble and normal channels, mfg. 1965-66.
Also available with Tremolo as an option, model number T1987. This model replaced the original JTM-45 in 1965. The JTM-45 Model 1987 was replaced by the 50W Model 1987 in 1966.
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JTM-45 (MODEL 1989) 45W ELECTRIC ORGAN

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- similar to the JTM MK II except designed for electric organs, mfg. 1965-66.
Also available with Tremolo as an option, model number T1989.
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JTM-45 MODEL 1987 REISSUE (MODEL 2245)

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- 30W, head-unit only, tube chassis, preamp: 3 X ECC83, power: 2 X 5881, GZ34 rectifier, two channels, front gold control panel, four inputs, six knobs (p, b, m, t, v1, v2), black covering, 32 lbs., original reissue of the JTM-45 (Model 1987) re-released in 1989, mfg. 1989-2020.
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JTM-45 LIMITED EDITION HALF STACK (MODEL 2255HS)

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- reissue of the original offset-chassis JTM-45 with matching 4-12 in. speaker cabinet, mfg. 2000-03.
Back in 1962, three JTM-45 heads were built with an off-set chassis. Recently they went to work recreating this model piece by piece all hand-wired and made to look original. This model was a limited edition run of 300 half stacks that were numbered in sequence - 250 were sold in the U.S. with the remaining 50 sold in Japan.
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