February 2008 \ Features \ Product Spotlight \ The BluesBreaker Revisited

The BluesBreaker Revisited

John Wiley
Premier Guitar February 2008

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The BluesBreaker Revisited
If you want to nail Clapton’s tone, a crucial part of the equation is the amplifier.

With a little ingenuity, John Wiley shows you how to turn your reissue Bluesbreaker combo into the real deal.


A unique distinction of early Marshall amplifiers is that none of them within the same model line sound exactly alike. Partly attributable to Founder Jim Marshall’s penchant for working with budding British musicians and working many of their suggestions into his designs, and partly due to the difficulties of locating reliable parts suppliers, Marshall’s early designs each had their own personality. For instance, Marshall’s Model 1962 combo was, itself, an ordinary amplifier; however, one particular Model 1962 used by Eric Clapton with John Mayall and the Bluesbreakers had such a revolutionary tone that it created a new sound in the still-young world of rock n’ roll.

In 1965, Clapton found himself the featured guitarist in John Mayall and the Bluesbreakers. Armed with a 1960 Gibson Les Paul and the Marshall Model 1962 combo amplifier, he single-handedly discovered a combination of guitar and amp that produced an extraordinary howl – Clapton achieved his trademark sound by playing the amplifier at full volume. The sound was full-bodied, authoritative, but not overly distorted; it easily cut through the other band instruments. The sustain was pure, the treble notes sang and the bass registers exhibited a “throaty” bottom. At such high volumes, the amp was prone to feeding back, and this provided an awesome effect to the overall sound.

The BluesBreaker Revisited
This image, from the Beano LP, shows Clapton tuning up, with his Model 1962 in the backround
The blistering tone was captured on vinyl and released to an unwitting public as John Mayall and the Bluesbreakers with Eric Clapton; also known as the “Beano” album, it quickly shot to number six on the British charts, even amongst the din of other popular British and American pop groups such as the Beatles, the Animals, the Rolling Stones and the Beach Boys. That LP’s impact soon spread to America and abroad, inspiring legions of new guitarists around the world – especially influencing musical rebels in the United States. Clapton’s playing style, combined with a ferocious amplified tone, seemed to inject a new and exciting dimension into the young blues-rock genre. But none of this could have happened without the small British amp company, Vox. Models like the AC30 would provide the “British Invasion” with its unique sound, and convinced Marshall to build a compact amplifier for his new company; the initial development of Marshall’s first combo took place in early 1964. In a 2003 interview with Musician’s Hotline magazine, he claimed the Model 1962 was built at the request of Eric Clapton. “Eric used to practice in my shop and he was one of the first guitarists to ask me to build a combo,” Marshall recalled. “He wanted one so it would be easy for him to put the whole thing in the boot [trunk] of his car.”

Unfortunately, that Model 1962 disappeared, with Clapton himself unsure of what became of it; years later, it would become known as the holy grail of combos. Although those early combos had great tone, no two sound exactly the same. Two decades later, the Marshall reissue would sound nothing like it at all.


The Reissue
For many of us, the year 1990 brought an answer to one of our greatest wishes: the Marshall Model 1962 2x12 combo was finally reissued. The idea had apparently been in the works for quite some time, as evidenced by this author’s correspondence to a Marshall Factory Director, Keith Carnall in the late months of 1984. Carnall’s reply stated, “We have thought many times about running a ‘vintage special,’ with valve rectification and all the other old goodies… let us just say for now that it is an idea that we will continue to work around and perhaps you will get your wish granted.” Although Clapton was not aware of the amp being reissued, Marshall christened it the “Bluesbreaker,” in his honor. When asked in a 1989 Guitar World interview he replied, “Did they really? How sweet. I didn’t even know that. How does it sound?” Marshall simultaneously introduced the Bluesbreaker and the JTM45 in 1990, along with the new JCM900 Series.

At a cursory first glance, Marshall did an outstanding job recreating the Bluesbreaker, as it externally resembled the original with the distinctive and elegant Marshall styling. Just like the original, it was rated at 45 watts and came with two Celestion speakers. The cabinet dimensions measured 29.13” wide by 23.62” high by 9.25” deep, and black vintage tolex coupled with a vintage-style Bluesbreaker grill cloth completed the package. Electronically, the 1989 reissue used two 6L6 vacuum tubes for power, three ECC83 (12AX7) preamp tubes and one GZ34 rectifier tube. In 1993, Marshall replaced the 6L6s with 5881 vacuum tubes. Tonally, the Bluesbreaker reissue had a unique and fine sound of its own. It produced varying degrees of that buttery smooth sustain, while retaining that traditional Marshall crunch.


The following is a listing of the basic differences between the original Model 1962 and the Model 1962 “Bluesbreaker,” as reissued in 1990:


Model 1962 Original Reissue Bluesbreaker
Cabinet Dimensions: 32” X 23” X 10.5” 29.13” X 23” X 9”
Cabinet Material: Birch Plywood Particle Board & Plywood
Grill Cloth: Horizontal strip Checker pattern
Output Tubes: KT66 6L6 / 5881
Speakers: Celestion 20-watt Alnico Celestion 25-watt Ceramic

But just how close was this new variant to the original Model 1962? To the true Marshall collector, and to the rare few who actually owned the genuine article, the differences were immediately apparent. In Michael Doyle’s book, The History of Marshall, he pointed out that the cabinet was too small and the grill cloth was not right. But the major disappointment was not in the appearance, but the sound the amplifier produced. While the sound was good and had plenty of Marshall crunch, it was definitely not the sound of the original. And for that reason, I began a quest to change the sound of my reissue into something more closely resembling the original.

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Comments

(11 comments) display by
UsernameComment
frank
on 12/03/2012
manque le poid est necesaire savoir aussi
Duke
on 06/24/2011
I have a mojo large size combo. Huge sound difference when compared to the reissue marshall.
John Moleksi
on 07/01/2010
Where is the best place to buy a kit from in order to try to build a better bluesbreaker? I can build the cabinet myself.

zaphod_phil
on 11/09/2009
Great article, but it's wrong where it says "the speakers supplied in the original combo were G12M “Greenbacks,” rated at 20 watts each. This speaker utilized an Alnico magnet..." G12M 'Greenback' speakers, even the original 20W ones, have always had a ceramic magnet. The Celestion G12 Alnico Silver and Blue speakers are the alnico models. I was surprised to see such a fundamental error.
John
on 10/15/2009
I have a Metro Amp JTM45 build. I sourced out for some vintage parts so this is a custom build from a Metro Amp kit. I am replacing a pair of June 1962 Mullard EL34's with some new Gold Lion KT66's tomorrow. I have a Swanson custom build Marshall Style 1 combo with a pair of original Dec '64 Celestion Pulsonic speakers with the original cones and paper. I am hopeful this will be tone nirvana...not that the '62 Mullards are not. I am also running a vintage Mullard AX7 in V1.
Lord Valve
on 11/19/2008
Since it's rumored I may know a little bit about tubes, I'll pass this on... ;-)

The Reflektor-production "Tung-Sol" KT-66 isn't a KT-66. Rather, it's a set of the Reflektor-production "Svetlana" 6L6GC guts mounted in a metal-based KT-88 bottle. It doesn't sound like a KT-66, nor spec like one. (I'm not saying it sucks or anything, but it isn't a KT-66, and if you like the tone it produces, you can get it cheaper as a Reflektor/Svetlana 6L6GC.) The JJ KT-66 is an unknown quantity at this point; like the Tung-Sol, it's mounted in a KT-88 bottle. I haven't had time to do any testing on the dozen sample pieces I have. Stay tuned. The Groove Tubes KT-66s used to be made in Russia by HP. No more are available. I don't know what GT is using for KT-66s these days, but I wouldn't be surprised if they are Shuguangs. The "Valve Arts" KT-66s mentioned in the article are from Shuguang. They do indeed sound excellent, although (like most Chinese power tubes) they don't last as long as I would like. Probably the best currently available KT-66 is the Reflektor-production "Gold Lion," a clone of the original GEC KT-66. The new (I don't like to use the term "re-issue") Gold Lions are probably as close to the originals as you are going to find; you'll need to take out a second mortgage if you want real ones. Although it doesn't matter in this particular application, the Gold Lions are serious eye candy - they look like someone cared.
I like that. They sound great, too.

Lord Valve
NIC
on 09/24/2008
Thanks, this is great information and i have a reissue bluesbreaker which i would love to convert to the original specs however i live in New Zealand and the voltage here is 220-240v. My question is "where do i find a suitable output transformer rated at 240v"? can you help me? Nic in NZ
Rick
on 08/12/2008
I have examined the Mercury Magnetics RS output transformer in detail and find it in no way similair in design or measured characteristics to the real RS Deluxe output transformer.. It does not use the same winding geometry nor the same type of core material.. It does not even sound remotely the same. Nice push for Mercury through...Brain at Marstran makes a much closer replacement. Also, Merren Audio makes a repro with the original style Tag-Board..
You need to research a bit more before leaping to such conclusions.
Brian Myers
on 02/13/2008
Hi,
Great stuff, except! in the table
"The following is a listing of the basic differences between the original Model 1962 and the Model 1962 “Bluesbreaker,” as reissued in 1990:"

It lists the "original" [as compared to the reissue] depth as 10.5 " but thats the series II It should have read 12" deep.
Thanks for a great read!
Brian

JoeZ
on 01/27/2008
I thought I'd share a couple of other tidbits I've picked in my pursuit of an authentic sounding "Bluesbreaker" combo amp.

Original Radiospares output transformers were hardwired for 16 ohms output. It's my understanding that Marshall used only 16 ohm Celestion speakers and in 2 x 12 1962 Bluesbreakers combos, wired them in parallel for 8 ohms. This "mismatch" is vital for Beano tone. I'm not an electronics expert, but I've been told by knowledgable amp gurus that this arrangement works for this amp's transformers and tubes.

Makers of accurate reproductions of JTM 45's and 1962 combos include Germino Amplication (I highly recommend working with Greg Germino who provided me with a special order Style II cabinet upon my request, although he prefers the Style I), Retro-King (Style II) and Blockhead (Style I) with kits available from Metropolous, Mojo and others. As far as I know, only Metropolous and Blockhead offer a tremelo circuit on their BB's.

The matter of speakers is the subject of significant discussions on guitar-related internet forums. The consensus seems to be that the speakers in Clapton's 1962 were AlNiCo's, mostly based on the sonic evidence, which also seems likely since ceramics were only first being introduced in late '65 and widely used in '66. Based on dates in Doyle's book only the recently reissued Celestion G12C-25 ceramic speakers could have been available for use in Marshall combos before April '66 recording of the "Beano" album. Power handling ratings on AlNiCo's seemed to have increased during the sixties and it also seems that Celestion used speaker cones from Pulsonic 102 003 and Kurt-Mueller H1777. Their were probably numerous variations. There's some reluctance to use relatively expensive Celestion Blues rated at 15 watts each in a Bluesbreaker combo since the rated power is reported somewhere between 30 and 45 watts. Further it seems that the speakers used in Clapton's speakers may have had different cones and othe



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