1969 Marshall JMP model 1930 combo

JMP amplifiers, 1959/ 1987/ 1992/ 1986 (non-MV) 2203/ 2204 (MV)

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Gridlock
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1969 Marshall JMP model 1930 combo

Postby Gridlock » 20 Jan 2017, 18:13

Here is a rare JMP amp that I am guessing not many have seen. It is a 1969 model 1930 "Popular" combo.

The amp is similar to the same vintage 1958 2x10 combo,with two channels and tremolo, but the amp was originally 10 watts instead of 18 watts.

My amp has been converted to the 18 watt circuit. My tech said that the conversation appears to have been professionally done and with period correct components.

I have read that this conversion to 18 watts was somewhat common for this amp.

I've never seen or heard of this model Marshall, until I found this amp, and I have been a Marshall guy since buying my first JMP 2204 half stack as a kid.

This amp is still running the original 2x10's (Celestions?) and to my ears, it sounds better than the two 1974x's that I have owned.
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Amps:
1967 Fender Super Reverb-Amp
1994 Fender '63 Vibroverb RI
2016 Fender ‘68 Custom Princeton Reverb
2016 Marshall 1962hw Bluesbreaker
2016 Marshall Astoria Combo
Guitars:
1973 Gibson SG Standard (Cherry Wine)
1999 Fender American Standard Telecaster
2009 Fender American Standard Stratocaster
2012 Gibson Les Paul Traditional (Desert Burst)
2014 Fender American Standard Stratocaster

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Re: 1969 Marshall JMP model 1930 combo

Postby Alpeggio » 21 Jan 2017, 03:36

From the book, The history of Marshall.
The 1x12 used a greenback. 2x10 doesn't say.
Made from 1972 to 1973 only.
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JTM45, YJM plexi, KK800, JTM60, JTM1, JMP1, JCM1, DSL1, JVM1. Laney Lionheart 5w, Laney Ironheart 15 studio.

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Re: 1969 Marshall JMP model 1930 combo

Postby Gridlock » 21 Jan 2017, 06:16

Alpeggio wrote:From the book, The history of Marshall.
The 1x12 used a greenback. 2x10 doesn't say.
Made from 1972 to 1973 only.
20170121_113233.jpg


I've read that there is an error in that book with the dates for this amp.

I am pretty confident in the date of manufacture.

I need to purchase that book.

Thanks.
Amps:
1967 Fender Super Reverb-Amp
1994 Fender '63 Vibroverb RI
2016 Fender ‘68 Custom Princeton Reverb
2016 Marshall 1962hw Bluesbreaker
2016 Marshall Astoria Combo
Guitars:
1973 Gibson SG Standard (Cherry Wine)
1999 Fender American Standard Telecaster
2009 Fender American Standard Stratocaster
2012 Gibson Les Paul Traditional (Desert Burst)
2014 Fender American Standard Stratocaster

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Re: 1969 Marshall JMP model 1930 combo

Postby Alpeggio » 21 Jan 2017, 07:09

You might be right.
It didn't sound right when I read it.
Interesting it only has one preamp tube.
JTM45, YJM plexi, KK800, JTM60, JTM1, JMP1, JCM1, DSL1, JVM1. Laney Lionheart 5w, Laney Ironheart 15 studio.

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Re: 1969 Marshall JMP model 1930 combo

Postby Gridlock » 21 Jan 2017, 08:01

Yes, I recall reading that the preamp tube was shared somehow?

Remember, my amp has been converted to an 18 watt.

I had a speaker jack installed and this amp sounds huge through my Bluesbreakers 2x12 Greenbacks.

Not worried about originality at this point. This is a keeper amp for sure.

I may get an Avatar Vintage style matching 1x12 cab with a Creamback or a G12H-30 to add some bottom end.

I'll upload more photos today.

Thanks again.
Amps:
1967 Fender Super Reverb-Amp
1994 Fender '63 Vibroverb RI
2016 Fender ‘68 Custom Princeton Reverb
2016 Marshall 1962hw Bluesbreaker
2016 Marshall Astoria Combo
Guitars:
1973 Gibson SG Standard (Cherry Wine)
1999 Fender American Standard Telecaster
2009 Fender American Standard Stratocaster
2012 Gibson Les Paul Traditional (Desert Burst)
2014 Fender American Standard Stratocaster

Gridlock
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Re: 1969 Marshall JMP model 1930 combo

Postby Gridlock » 21 Jan 2017, 09:27

More pictures of my amp.

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IMG_3967.JPG (1.82 MiB) Viewed 480 times

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IMG_3971.JPG (2.73 MiB) Viewed 480 times
Amps:
1967 Fender Super Reverb-Amp
1994 Fender '63 Vibroverb RI
2016 Fender ‘68 Custom Princeton Reverb
2016 Marshall 1962hw Bluesbreaker
2016 Marshall Astoria Combo
Guitars:
1973 Gibson SG Standard (Cherry Wine)
1999 Fender American Standard Telecaster
2009 Fender American Standard Stratocaster
2012 Gibson Les Paul Traditional (Desert Burst)
2014 Fender American Standard Stratocaster

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Re: 1969 Marshall JMP model 1930 combo

Postby TM1 » 31 Jan 2018, 13:50

The 1930's have an ECL86 output valve which also doubles as a phase inverter. It's a two section valve; 1st section is a single stage 12AX7 and goes into a EL84 all in one valve. I think Marshall looked at it as an experiment In Seeing if they could make a simpler amp using one less valve.
Great amps and I've worked on a number of them. But rather enimec on the output level.
Get those awful Orange Drops out of that amp and put some Sozo's in it. The "orange crud" is fine for a Fender.. :winking

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