God’s Gift to Rock: A Late ’70s Marshall JMP 100 Watt

30 Sep God’s Gift to Rock: A Late ’70s Marshall JMP 100 Watt

(please note: this post is a follow up from a previous research: Angus Young’s Marshall Amplifier(s) & the “Back in Black Tone Project” )

EDITED: Members ROCKER and Sgace have helped me determine that this amp was NOT a super lead (NON master volume) but it was born as a Master Volume since its beginning. It was later modified as stated below. Have no idea of the differences yet 😛

So, it has arrived (for the record, this is a 1979 Marshall JMP 100w Lead).

The “Destiny” wanted that the first of the two JMPs I bought the other day to arrive was the the 100 watts.

So it was.

I quickly and swiftly hooked it to one of the two cabs I have now, the reissue non slanted cabinet with vintage 30s inside.

I blew a fuse the moment I turned it on, because the voltage (mains) selector was probably disabled when the amp was modded. No problem, I constructed a quick fuse and stuck it in.

Then it turned on.

Why have I waited so long? I don’t know. I thought Marshalls were Marshalls. Not true. They’re all different. So please be patient – you that have followed me so far: THIS is THE Marshall for me. A voice inside of me, after playing it, said “Thou shall not know any other after this

Well folks, my quest for AC/DC tone from the mid to late 70s to early ’80s might have ended today: this amplifier is the best thing I ever connected into.

Do I sound exaggerated? I apologize. I am extremely, extremely excited and I am having a hard time to stay calm. My wife saw me and she understood right away something different was in the air.

I played it for circa thirty minutes. Now keep in mind this amplifier has been modified: let me give you – directly from the eBay auction I got it off – what the seller stated:

Genuine Lee Jackson Metaltronix Mod

This Marshall is in exceptional condition for its age and features all original Drake Transformers, and the complete Metaltronix Mod with Master Volumes 1 (front) and 2 (backside, also has a push-pull switch which allows it to serves as a power attenuator), 6-position Mid Frequency selector to morph the tonal characteristic from beefy blues to metal, and tube-buffered effects loop with Send and Return levels (the Return control is a push-pull switch, allowing you to engage the effects loop or bypass it to go straight onto Master (1) on the front). Lee’s signature and work completion date (smeared by control cleaners) are on the inside corner of the chassis, near the effects loop circuit (see third photo). Recently retubed with a matched quad of JJ E34L and five NOS Sovtek 12AX7WA preamp tubes. New three-prong power cable is included. Enjoy!



Now see the settings here:


And these are “guts” of it:




This was instant Back in Black (the album). I say, I mean, instant. Right away. I was blown away. Naturally, since i played it in my “laboratory”, I set the volume (the attenuator) at an extremely reasonable level. I could almost talk over it. Softer than I used to keep my 1987XL when was doing the tutorials thing back then (do you remember?).

This amplifier brought me back – partly – to when I was playing my 100 watts 1969 Super Lead (i.e., a 1959 model from 1969 I used to own).

There is a super attack that will support you/help you. The three or four SGs I tried into it were almost playing by themselves. A feeling of ease I had long forgotten.

If you followed me reading so far: I am in heaven. Do you remember when I was saying that gear has to sound good and make your life as a guitar player easier?

This one does. Whatever you do, whatever note you play, however you play it (soft, hard, biting, … ) sounds godly.

It’s hard to describe and no, I don’t have a video/audio for you yet.


As a completion to this project – you know how serious I am about this – I have investigated a bit on a good guitar microphone recently. I don’t have my Neumann U67 anymore.

I have a Neumann U47, but it needs repair, as it’s not working (and I’m bringing it to the shop on Monday).

So, what did I do?

I started a month ago studying some AC/DC images – recent ones – from a live show. I had seen this microphone on Angus’ and Malcolm’s cabinets:


Turns out this is an Audio-Technica AT4047 Condenser Microphone, with following features:

The Audio-Technics AT4047 Condenser Microphone is designed for professional recording and critical applications in broadcast and live sound. Transformer-coupled output and a specially tuned element provide sonic characteristics reminiscent of early FET studio mic designs. The AT4047 mic has exceptionally low self-noise, wide dynamic range and high SPL capability. It sports a vintage silver-matte finish on the microphone and shock mount. Audio-Technica includes a protective case and AT8449/SV shock mount with the AT4047 microphone. Requires phantom power.

Audio-Technica AT4047 Condenser Microphone Features:

  • Gold-plated, specially contoured and aged, dual-diaphragms
  • Switchable 80 Hz hi-pass filter and 10 dB pad

Muisican’s Friend link

Update: it is confirmed that AC/DC did use this microphone during this tour. From sound engineer that ran AC/DC live:

AC/DC is the best rock band there is,” enthuses front-of-house engineer Paul “Pab” Boothroyd. That means a lot coming from a man who’s been Paul McCartney’s live engineer for the past two decades, and whose list of clients includes Faith Hill and Paul Simon. Boothroyd has handled FOH duties for AC/DC since the band’s 1996 Ballbreaker Tour, and he’s back at the helm for their latest, the Black Ice World Tour, which promotes Black Ice, the group’s first album in eight years.[…]

As for guitar amps, it’s “Marshall, Marshall, Marshall, Marshall, 11, 11, 11, 11, loud, loud, lots of them,” Boothroyd says with a laugh. “There are about 20 [amp] cabinets up there. They are all flat-out — there’s no gimmick here, They’re there to spread guitar across the stage.” The cabinets have 100-watt Marshall heads, which have been tweaked by the tour’s amp technician to run hotter than a standard amp. “This is okay — it just means you go through a lot of tubes, but it gives it that sound,” Boothroyd says. “I put one mic on one cabinet, an Audio-Technica 4047. I’ve tried various microphones, much to Malcolm [Young, rhythm guitarist] and Angus’ [Young, lead guitarist] disgust because they’d be quite happy with just an SM57 on there. But I wanted to capture some other qualities, so I went for a slightly larger-diaphragm mic, and I found that the only one I really liked was the A-T 4047.”

(from Mixonline)

I thought that if it sounded good for them, it will sound good for me, too.

So I got one. You will have to wait until I have it – a bunch of useless days – and then, I will overload you with experiments.

I just couldn’t walk away from this little room today. I couldn’t… but I had to. Family needs me.

I am leaving you with a couple of foolish pictures of SoloDallas’ “laboratory”.

Love, Fil








Fil "SoloDallas" Olivieri

We Are Rock 'N Roll People.

  • avatar
    Posted at 07:38h, 01 October

    LOL, like in a guitar shop, you have many guitars 🙂

  • avatar
    Posted at 05:54h, 01 October

    Hey Fil, can’t wait for some sound clips of this new amp. Judging from you’ve said, it sounds like an amazing amp.

    What do you think of a jcm800 2204 clone (vertical inputs) for that angus tone (Let there Be Rock and late 70s live tone) ? What i really want is a plexi ( i love Kossoff the most) but i can get this amp for $750 AUD. Just wondering, since you’ve been talking about MV amps recently. Although this new amp is a NMV superlead isn’t it?

  • avatar
    Posted at 03:10h, 01 October

    Interesting, from home I can write comments, from my desktop PC, I think this is an internet problem from the hostel…

  • avatar
    Posted at 02:22h, 01 October

    Congrats Fil, sounds like it was the perfect acquisition.

    Just curious, do you have a link or anything for that photo with the mic next to the cabinet?

  • avatar
    Posted at 02:19h, 01 October

    Very nice, Fil!

  • avatar
    Posted at 22:09h, 30 September

    Told you that Angus used NMV. So I assumed that you would like it.

  • avatar
    Posted at 21:33h, 30 September

    I spy a fender in that collection. Just looked a little outta place. Hehe. I can’t wait to hear this amplifier… I’ll have to keep a look out for one of these around.

    • avatar
      Posted at 21:45h, 30 September

      I noticed that too! He has that blonde telecaster like malcolm used on a few tours! I think Fil may be holding out on us… 😉

  • avatar
    Posted at 20:41h, 30 September

    I think I know how you felt. For me it was an original 1965 Fender Twin Reverb I found at a guitar shop in NYC a few years ago. I simply had to buy it, and it’s been a main part of my rig ever since.

  • avatar
    Posted at 18:09h, 30 September

    Fil, this is a huge step for mankind (or atleast for those of us who want to replicate famous ac/dc guitar sounds!) I cannot wait for the demo!

  • avatar
    Posted at 16:42h, 30 September

    I can’t believe there are no audio clips haha! I will be checking the site every hour for an update now. The best purchases are when you INSTANTLY know you have struck gold and by the sounds of this post you definitely found it.

  • avatar
    Posted at 15:07h, 30 September

    Man Fil, thats the cool thing about you:
    Youre still impulsive and enthousiastic, you never let things go 😀
    I could spend days just sitting in that room and trying out these Guitars, thats one FINE collection Fil. You should invite us over to your house 😀

  • avatar
    Posted at 14:56h, 30 September

    This instantly makes me to put BiB on the cdplayer 🙂

  • avatar
    Posted at 14:51h, 30 September

    yes man!! I’m so happy with you

    • avatar
      Posted at 14:54h, 30 September

      Can’t wait to hear Back In Black, Hells Bells, Shook me all night long and Rock’n’Roll Aint Noice Polution on it 😀 !

  • avatar
    Posted at 14:44h, 30 September

    cant wait to hear it Fil!! play play plaayy! hahaha maybe give hells bells another shot?? with this JMP of course 😉

  • avatar
    Posted at 14:43h, 30 September

    I can’t wait to hear this beast, i can’t imagine the tone, i gotta hear it, just thinking of Back In Black tone now, tell me it can do it as i can hear it in the album thundering in my mind right now???

    IF, i’am correct, then i’ll know exactly what the first tube amp will be, i’ve searched for the amp that can mimic the BiB tone but never been sure what amp exactly that can do it, but you’ll do a great favour if you’ll tell me this is the amp ! 🙂

    Congratulations to the new amps! 😀

    • avatar
      Posted at 14:51h, 30 September

      (sorry didn’t saw all text at first, but i know now after reading it all, dont have to say it, my mistake) 🙂

      What are the price range for these amps?? I can’t wait to try obtaining a similar one when i can afford it after the guitar 🙂 🙂

  • avatar
    Posted at 14:41h, 30 September

    Dear lord, that is quite the playroom there. If only if only. You are exactly what i aspire to be… 😀

  • avatar
    Posted at 14:25h, 30 September

    Hey Fil, wake up! Can you hear me? Wake up!

    …….hmm, it is your dream or is it real??? 🙂
    I’m happy for you. Can’t wait to to hear it.

  • avatar
    Posted at 14:22h, 30 September

    While reading your post, my smile gets bigger and bigger…I felt similar when my SG arrived and I unpacked it.
    You know, the moments in a mans life where you just feel that you did something very right, finally.

    I feel happy for you, hopefully you can resist to sleep with it tonight 😀

  • avatar
    Posted at 14:06h, 30 September

    All good things come to those who wait, I’m talking to the amp now that it’s found you 🙂 I smiled at your excitement all the way through the reading, one instinctively knows when something is right. I hope this is the one for you and for us.

    • avatar
      Posted at 14:07h, 30 September

      (just looks at Rob and smiles, nodding, in hope).

  • avatar
    Posted at 13:53h, 30 September

    I absolutely love that amp, I’ve been looking at some 50 watt versions recently, btw sick with envy at your guitar collection 🙂

    • avatar
      Posted at 13:54h, 30 September

      Dave, leave the envy apart and move your butt from UK to here. Let’s play?

      • avatar
        Posted at 14:01h, 30 September

        I wish I could man :), this is the amp I’ve been having a look at, http://belfast.gumtree.com/belfast/36/63347336.html it’s a good price but no MV, so I’ll have to get an attenuator or something.

        • avatar
          Posted at 14:04h, 30 September

          Dave, grab it. Get it now. Don’t let it slip. Go for it (can continue on if you want… do you get the message? You know how careful I have been with suggesting gear in the past… I never do. I only tell what I am using. Different this time: GET IT!!!

          • avatar
            Posted at 08:41h, 01 October

            Can you link your Guitar Rig settings for AC/DC tone?

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