From Fil ‘SoloDallas’, just an introductory word for our friend Roe. Roe has been on the hunt for AC/DC’s tone at least since I have been; that means, years and years, if not decades. So it’s not something it started yesterday. It’s been a long way coming. Roe’s original link (added) denotes him being a researcher (like us) and collector of various information, scattered around places and time. He has been an inspiration for us at SoloDallas as well as a source of primary information. It would not be fair reproducing his work here without these lines of mine. May information be divulged honestly and properly for the sake of us all, always.
Reproduced from: The Evolution of the 100W Circuit: From JTMs to JMP Superleads
By Roe Fremstedal ©2011-2012
This article tries to give an overview over the early Marshall 100 watt amplifiers by piecing together available information and shedding new light on transitional models from 1967. The first 100 watt amps – known today as “JTM45/100s” – used “JTM45” plexi faceplates and white “Super 100 Amplifier” back-plates. However, the 100 watt PA amps used “JTM100” faceplates. In 1967 several changes were made. First, the plexi “Superlead” and “Superbass” backplates were introduced, then the so-called “Black Flag” “J.T.M.” plexi faceplate was used in a transitional period. Finally, the “JMP” plexi faceplate replaced the earlier faceplates. The main stages in the evolution of these early 100 watt amps are:
1. Prototypes (1965)
2. Amps with dual output transformers (1965)
3. First amps with single output transformer (1966)
4. First EL34 amps (1967)
5. Second series of EL34 amps with dual rectifiers (1967)
6. JMP faceplate and new power supply (1967)
7. New Superlead circuit (1968)
8. New chassis and higher filtering (1969)
9. Yet another chassis, last plexis (1969)
10. Aluminium panel amps (1969-) (more…)
This is my first article here at Solodallas.com. I hope this can be useful to all of you who are interested in buying old Marshall amps.
(SoloDallas’ note: it is with pleasure that I introduce to you our already very well known friend Andrè, aka Jaiminho Pagina: he’s now a contributor of SoloDallas.net!)
(NOTE – I did some updates at the 2203/ 2204 section of the article ~JaiminhoPagina)
Before starting, I must warn you that acquiring vintage gear can be really risky. You can end up buying something that is not what you expected or even something that is damaged or modded beyond repair. So, always keep your eyes open for “fishy” deals, look for information, and always ask for high definition photos (especially from the interior of the amps – the circuit, the tubes and transformers) to make sure everything is right. If you don’t have much experience (myself included, to be honest :P), I recommend asking help from the members here of the community. Post a link of the desired amp on the “Ebay Watch Post”, so we can help analyzing it. (more…)
Update of Saturday the 16th.
Brought the treble side of the Rhythm part down a tad. Replayed both solos, re-positioning the microphone, still only one microphone (I lack the second damn XLR jack, would you believe it? and I was too hectic trying the solos again).
Changed the equalizer settings for the solos slightly, see both new equalization settings.
Also, “bounced” Angus’ parts without the master track (i.e., you now can listen to me alone, rhythm and solos, no song).
Back in Black with the new settings, solos:
In order to get the amount of drive I needed (and that is heard on the record) I kept the loudness way down by using an attenuator, settings here were… all at 10! LOL. Except for presence that was still 0. All the rest, for the solos here, 10.
Parts ONLY (no original song):
New equalization settings: (more…)
While I have NO idea who in the world David Szabados is, reading this was useful and made sense. Many things I knew already, others I didn’t. The more info the better, agreed?
Tone Tips And Tricks For The Marshall Super Lead
The following tips and tricks will enable you to get much more versatility out of the Super Lead. Some of these may even surprise you. One thing to note – NONE of these involve modification to the original Marshall circuit. Those looking for the true “Marshall” sound only need use an original, unmodified Super Lead.
Channel Switching and Linking (more…)