This is what the Marshall Plexi 1987 LEAD and 1986 BASS versions EXCEL at!
In this video I compare two amazing 1970 Marshall JMP 50W amps - one is the Lead version (model no. 1987) and one is the Bass version (model no. 1986). This is a great opportunity to make this comparison since these amps where built within days from each other. I’m Comparing all EQ and Gain settings, you can navigate to what you’re interested in using the time tags below. I’m using a 2010 Gibson Les Paul Custom Black Beauty and I play both amps through a 1971 Marshall 4x12 model no. 1960A (G12M25 75Hz Celestion Pulsonic Greenbacks).
00:00 Introduction
02:01 Section 1 - Gain comparison Bright Channels (playing from 02:13)
04:26 Section 2 - Gain comparison Normal channels (playing 04:34)
06:35 Section 3 - EQ comparison summary rhythm riff (playing 07:10)
08:35 Section 4 - EQ comparison summary solo (playing 09:01)
09:57 Section 5 - EQ comparison summary cleans (playing 10:21)
11:03 Section 6 - Comparing all 4 inputs (playing 11:19)
12:59 Section 7 - EQ comparison solo (playing 13:12)
15:31 Section 8 - EQ comparison rhythm (playing 15:31)
18:41 Section 9 - EQ comparison cleans (playing 18:41)
21:06 Section 10 - Circuit differences and how they influence tone
24:20 Section 11 - Comments
Check out the evolution of the circuit from 59 Bassman via JTM45 via JMP 50 etc here:
The 10 most Classic Marshall Amp Schematics are THIS SIMILAR!
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