The Evolution of the 100W Circuit: From JTMs to JMP Superleads

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.

Love, Fil

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-)

Forever Malcolm Young
[vc_row][vc_column][vc_column_text] Reproduced from www.guitarnerd.com.au with Tony Giacca's permission.

A tribute to the man & guitar who created the soundtrack of Australian rock’n roll.

Growing up in a country town, AC/DC was a big part of the local music culture. It was either on the radio, or blasting out of someone’s car stereo down the main street or being played by every local cover band at the pub. I can’t remember the first time I heard them… they were always there. And the older I get, the more I appreciate their genius.

History of the JTM50

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.

“Nothing is new…”

"... except what has been forgotten."

Says he. And in fact, the core running underneath is always the good ole SoloDallas team. Same guys as always, but better (only Franz - former product manager - took a long pause, after being the real engine responsible for production and everything else, when we were back in Europe; seems like 100 years ago, now). In these two+ years here in the US I (we) have worked so hard that I can hardly believe it. I forget how many hours a-day; every day, on Saturdays, Sundays included, non-stop. Hectically. Then I’d take off for a while - but could never not-think about SoloDallas stuff. Just got to do it.


LA Talk Radio ‘All About Guitar’: Everything SoloDallas.

Just a note for you - the reader - as you approach this page: we suggest you click now on the media player and start listening to the audio interview and all the while, you read the preamble to the show as I wrote it below. Just read, look at the pics and listen.

Sit back, relax and enjoy your time here, as always.

Terry Manning receives his SoloDallas Storm and loves it. Read about it here

Photo CREDITS: Josh Reynolds, The Boston Globe.Photo Credit: Josh Reynolds, The Boston Globe.

First off, some of you - you younger ones or even you, among the older ones not necessarily into the industry of music - who is Terry Manning? Well, to me personally, he means a lot of things which I will try and explain to you, briefly. But to the many  who don’t have much time to spend reading and investigating on things, he is a monster of music. He’s done it all; performing and producing. He’s a number of things (musician, composer, photographer, family man, pilot and much more, evidently). He was the man behind several bands back then  (‘back then’, a period in time I seem to like to go to, often) whether producing or engineering; bands such as Joe Cocker, Wattstax, Alex Chilton, Big Star, James Taylor, Leon Russell, Led Zeppelin, ZZ Top, Jason & The Scorchers, Rhino Bucket, George Thorogood and The Destroyers, Joe Walsh, Johnny Winter, The Rainmakers, The Fabulous Thunderbirds, Molly Hatchet, The Angels, Johnny Diesel and The Injectors, Lenny Kravitz, Jimmy Buffett, Shakira, Crash Test Dummies, Shania Twain, Bryan Adams, Widespread Panic, and many others

Please check him up on wikipedia: Terry Manning

The Story of Badfinger
This is somewhat an extension of my preview post about the music industry. Badfinger was a band from the late 60s and early 70s that wrote many worldwide hits and were bound to become one of the great bands of that era. Unfortunately, instead of fame and fortune, tragedy and misery is all they got in return. Even though their records were selling remarkably, they couldn't even afford a TV or a fridge for their house. Stan Polley, a business man, was taking care of their finances and told the band they would be living on fixed salaries until later, and that they would be millionaires. Things really started to go downhill in 1974, when missing money from the band's account led Warner Bros. to stop the distribution of their albums. They were sued by the recording company and couldn't move forward because of contracts with Stan Polley, who couldn't be contacted by any means. All this led to the suicide of two band members: Pete Ham and Tom Evans. Watch the documentaries for more details. The following videos explain the story a little better.
Today’s Music Industry Sucks – Does it Really?
It is a recurring thing those days to complain about the state of the music industry. They don't make music like the old days; so many talented musicians will never be famous because the industry only sells auto-tuned crap, and that sort of thing. You know, I used to believe that too, but not anymore. There is some truth to all this though, but the fact is that the music industry has always been awful. It's all about the money - it is like this today and it was like that back then. Don't get fooled.
Fil "SoloDallas" Olivieri photo with Marshall Amps
Well, Welcome Back!
Welcome back y'all! That's the first thing I (we) want to say. Do you remember when I used to say, "when I'm silent I'm working on something"? Well well.