JKEBA

Hi, this is my first time on here so bear w/me. A friend of mine owns some properties & he just cleaned one of them out & stumbled upon a 2x12 Marshall. He knew I played so he asked me if I wanted it since the people who rented from him left it behind. I am not very familiar w/older Marshall amps but this seems like it might be sweet. As I said it is a 2x12 combo-the mains & standby switches are the large black & red style. Controls in this order right of the switches-presence,bass,middle,treble,vol 1,vol 2(roman numeral), followed by four inputs labled 1 & 2 in roman numeral. On the control plate it only says JMP. Underneath near the tubes though it has the labeling JMP mkii. The serial # is a 4 digit followed by the letter "H". I haven't examined the tubes yet but it has two power tubes & three pre-amp tubes. It has two speaker outputs & the ohm selector is a knob that you actually pull out w/a window to show which ohm you have chosen. Also the cabinet has been stripped of any covering & grill.If anyone can give me hand idenitfying the type of JMP mkii it is I would appreciate it.

HOT TUBES 70

is there a S/L or SL/A in front of the serial number ?

S/L= 100 WATTS
SL/A=100 WATTS
H = 1976

so it looks like a JMP combo from 1976 , cool old amp !!
you can get some great tone from that amp !!

iF they left it behind , i'm guessing it needs some work ????

JKEBA

Actually there is neither. It has an S/A? Ya its pretty dirty, but everything looks to be intact. I am @ work today so I haven't had a chance to play w/it to much. The speakers around the rim have been chewed on a bit.

HOT TUBES 70

oops !!! i gave you the wrong info !!

yes , S/A = 50 WATTS

anyway you slice it , its still a cool old amp !!!

depending on condition it worth it in my opinion to fix it up
even if you have to put speakers in it or recone the originals,
retube it etc !!

great find !!

JKEBA

Thanks man I appreciate it very much. Awesome! I will definitely fix it up. One other question. Can I split my signal & use both inputs 1 & 2 like channel switching?

HOT TUBES 70

no ! as far as i know they are only a high and low input etc.
but maybe some of the long time users could shed some more
light on that suject .

has it got 2 inputs or 4 ?

i know that on the 4 input heads they would jumper 2 inputs
together to get more gain out of the amps .

janarn

That will work fine. My guess is that your amp is a model 2187,
the combo version of the 1987 head.
A 70's version of the 60's Bluesbreaker, and the model was made '74 - '81

JKEBA

Ok. I thought that the channel switching thing would work since it has vol.1 & 2, figuring that those were assigned to inputs 1 & 2 respectively w/high & low inputs for each one thus the four inputs. Is my understanding correct? Thanks for the additional info fellas.

janarn

You think right about channel switching.

HOT TUBES 70

see !! learned something new myself !!!

thanks to the forum !

JKEBA

Thanks again fellas. & yes thanks to the forum!

gfnoff

I just bought a 2187 combo from 1977. Does anyone own one or know much about this 50 watt-2 12 combo? I have noticed that if you couple the low and high output it sounds great!

Wilder Amplification

These old amps are not like a channel switching amp. Channel switching hadn't even been thought of when these amps were made. Both channels share the same master EQ section, but Channel I will be a bright channel while Channel II will be a more bassy sounding channel.

A common trick was to couple the inputs together by connecting a patch cable between the bottom input of Channel I and the top input of Channel II, then plugging the guitar into Channel I. Then you can use both volumes to balance betweens lows and highs.

These are very pedal friendly amps and sound AWESOME with a high gain overdrive in front of them at low volume.

__________________
Jon Wilder
Wilder Amplification

sales@wilderamplification.com

tech@wilderamplification.com

Trick

What a score!!!!!!!!!!!!!!!!