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…)
The Black Flag JTM50 is a rather rare and coveted after amplifier made by Marshal between 1966 and 1967. It was one of the transitional steps between the JTM45 amps and the plexi panel JMPs and later metal faces. During the short period of time it was produced, the JTM50 saw a few important spec changes that would be a precedent for further development of the Marshall guitar amps. (more…)
SoloDallas featured in GEARPHORIA magazine: “JUST how much does Filippo at SoloDallas want you to sound like Angus Young? A lot. So much so that he has made it a mission to reverse engineer one of Angus’ trademark pieces of kit. Not an amp or pedal mind you… it’s his ‘70s era Schaffer wireless system. And we can attest, it makes a surprisingly significant difference. The SoloDallas Schaffer Replica gives both bloom and depth to your guitar tone… making a vintage Marshall sound more like three vintage Marshalls. It is a pretty impressive thing to hear in person. We suggest if you have the opportunity to hear one for yourself, do it. The replica does away with the wireless aspect, but not the punch it gave to Angus’ signature roar.”
Main Research: André Kozuma
Edits and additional info, SoloDallas
So, hello again everyone!
Here I am again with another article.
This all is mostly things we already know, but I felt that we needed a place to put it all together and make it easier to consult rather than have to search though all the other pages to find the info on the comments or that sort of thing.
What I plan to do is a real Index for everything AC/DC related (gear-wise), but mostly the amps. Perhaps we can cover all of AC/DC’s history, but I can’t do this alone. I would like to ask every member of this community a little help. If you find any bit of info, good pics, videos, whatever it is, that you think it’s interesting, share with us, so we can oficially post it here.
So, let’s start with the amps.
Early Years – High Voltage, TNT, Dirty Deeds Done Dirt Cheap (1973 – 1976)
A few pics:
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…)