May 2009 \ Features \ 45 Degrees of Tone: The JTM45 Roundup

45 Degrees of Tone: The JTM45 Roundup

Steve Ouimette

Nearly 50 years since its creation, the Marshall JTM45 remains both a relevant and near-perfect example of what a great rock ‘n’ roll tube amp should be.


Premier Guitar May 2009

(4 of 8)



Wallace Amplification BKW45

Brian Wallace has electronics in his DNA. His father, an electronics engineer, and his grandfather, an RCA tube repairman, were both instrumental in his early education and development in tubes and electronics. When he was young his father gave him a 75-in-1 electronic projects kit and further encouraged Brian by letting him watch as he built his own projects. Like all of the builders in the roundup, Brian is a player. He began modifying amps in 1974, when he removed the speakers and baffle in his Checkmate amp and replaced them with a baffle he created and some purchased speakers—altering the sound of the amp and thus beginning his lifelong journey. In 1995, he was approached by Guytron Amplification to help out while they were getting started. A positive experience, it propelled him to the next level and led to the creation of Wallace Amplification, which now offers several amp models as well as replacement transformers under the Marstran name.

Wallace’s first amp is the BKW45, but he is more than a clone maker. Recently he introduced the Abaddon, which is a 50-watt master volume head consisting of four gain stages in the preamp. There is much more to come, including a line of pedals and a reissue of the Fuzz Ace pedal he made back in the early 90s. The BKW45 is a unique flavor of JTM45. A hair darker in tone and possessing slightly less gain than all of the other models, including both the vintage and reissue Marshall, it yielded enormous bloom and a bold, thick, sustaining quality. Even though there was a little less gain, it didn’t affect playability, and we never struggled with the amp. It was one of the rarest qualities I’ve experienced in an amp, and certainly an unexpected bonus.

The Wallace had a magical ability to push notes through loud and clear while still being able to dish out gritty and harmonically pleasing chords that didn’t fight the non-perfect intervals they were built on. This all came out of an amp that was using tubes you can buy today without breaking the bank.

Speaking of breaking, check out the sidebar on what the BKW45 was subjected to by UPS en route to our roundup. In spite of the gorilla treatment it received, the amp arrived without shattered glass and performed flawlessly throughout the entire set of three sessions of playing and listening. That’s a testament to a solidly built and roadworthy piece of equipment. And one look inside the amp will show what a dedicated and precise builder Wallace is. In tone and build quality, the amp is a work of art.

wallaceamps.com

Ever wonder what could happen to your amp in shipping? In the case of Brian Wallace’s BKW45 amp, UPS had a field day, and decided it would be a lot of fun to throw it around. When the amp arrived, it was packed neatly in a new cardboard box with padding inside suspending the padded road case that housed the amp. That’s double-boxed and protected by a case built for heavy abuse. Sadly, it took one good slide down the end of a ramp and collided with either another box or the wall of the truck. Though the box didn’t show any signs of abuse on the outside, it was clear that something had shifted when I opened the case. Take a look at this picture of the damage and the way the entire amp was shifted to one side because of the impact. Believe it or not, the tubes didn’t shatter and the amp worked fine, but it was cosmetically damaged by a broken front Plexi panel. This isn’t the first time this has happened, but it’s the first time I’ve seen it happen with this type of road-worthy packing. Let this serve as a reminder to always insure your amps, as the shipping company can’t tell if you’ve got a bag of peanuts in a box or an amp that was lovingly built by somebody like Brian.



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Comments

(35 comments) display by
UsernameComment
BobC
on 03/23/2013
@W.A.Looker Because they were named JTM45 due to the fact that they had a max output of 45watts. As measuring the power of guitar amps became more about a standardized RMS measurement and less about marketing fluff the "real" wattages started being used. People around when the JTM45 was created still know it as a "45 watt" amp even if under the more accurate measurement it is not.
W.A. Looker
on 10/25/2012
Why does everyone and I mean EVERYONE insist on saying that these are 45 watt amplifiers??? The clones might very well be, but on Marshalls own site it says that the reissues are 30 watts. It might not mean much to some, but if you are going to put it in writing, be accurate.
Joe R
on 08/13/2012
I have a 97 Re-issue (pcb) which performed extremely well for the past 10 years. Currently the board is being replaced with a Ceriatone turretboard unit and 5881's with KT66's. (all due to a funky colored burn on the pcb and strange microphonic type squeal (not affected by tube change in preamp). Can't wait to ressurect this beast!
paul
on 01/02/2012
I live in the UK and bought a JTM45 re-issue new, less than half the price of any of the clones here. And of course I supported British jobs cos the amp is MADE IN BRITAIN. Unfortunately, CELESTION SPEAKERS ARE CHINESE and as such are NOT British. My JTM RI sounds great. I think no amount of amp tone can make up for the tone you get from your fingers, so i am not even gonna read these reviews, I am going to PLAY.
de
on 03/16/2011
i have a jtm 45 reissue from the mid 90's. the original printed board is replaced with a doug hoffman marshall plexi-style point-to-point board and the amp builder had to increase the caps sizes a bit. it's now using 2 el34's, but i want to go back to using paired 6l6's/5881's. in my opinion the jtm 45's have a more mellow, less edgy tone than the jtm 50 w plexis, even when keeping the tube rectifier in there.
Andrew
on 08/23/2010
I have a JTM 45 reissue from the early 90's. This is the last model with the original Drake transformer.. Whoever says the Metro amps and all boutique custom built shit overtaking mine: thick bullshit. 6l6 sound darker indeed than EL34 but this particular baby really smokes... Tried Metro, Germino, Ceriatone, etc.. they are all good, but cannot really tell the difference sound-wise blindfolded.. SG, good cable, JTM 45 cranked, maybe throwing a fulldrive 2 in front of it, man you would love it!
Peter
on 07/24/2009
Just in reply to the man who said we are sheep... you're right :-) When you look at players in the sixties they were doing all sorts of wierd mods, slicing speakers because the distorted sound was groovy baby.... but they also used dual showmans, hiwatts, FUZZ boxes :-) My favourite amps at the moment are a Marshall DSL100 and Fender (red knob) Dual Showman head and they do everything, plus more, that I want... for another bloke it would be a Fender Twin or a Boogie... Don't get me wrong, these were great amps in their day... and when pushed they crank today... but again it's funny making big money from old technology...
Peter
on 07/24/2009
The reason why companies change their product is competition... idiots wanted more and more gadgets built-in to the amp... channel switching, overdrive, reverb, FX, lighter amps, etc... or be left behind in the rush...

You can't beat ONE great tone... and then play around with that... add one great guitar... and a guitarist with "the touch" and bingo... If I became a Satriani on guitar and used a TSL601 combo... and young pups looked up to me... they'd re-issue the TSL in 20 years time :-)

Cheers!
Frank M
on 06/24/2009
One thing I think needs to be pointed out about the Marshall Reissue in this roundup is that looking aththe PCB you can easily see that the circuit was totally modded from the original JTM45 circuit with those larger caps and how they're wired up as well as the fact that the orignal came with 5881s not EL34s so that was a mod as well. Still a great article and about the only one out there that compares them. Now if we could have a good Plexi 100 watt round up would be really great!
trippin
on 05/29/2009
Skeptical of "reissues"? Why did people stop making them? Easy. Making short term cost improvements and the typical kinds of model "upgrades" dictated by a competitive marketplace. The same reason Les Pauls were made with pancake bodies and poly finishes. So I'd say rather the opposite: the sheep were the ones lured to what was peddled as the latest and greatest iron at that point in time. Even the Beatles went all transistor, didn't they? Sputniks and all that mod stuff! That was like the cool thing: "Solid State." Since then we reflected on our musical history and discovered that, hey, whoa, we really liked those old records for a reason. Not everyone, mind you, but some. It's a conscious decision and a conscious goal that has nothing to do with wool bearing mammals, and it's not everybody's bag. So if it's not your bag, that's cool. But no one is "amending" the past. To the contrary, we're recreating it as true to original as possible. We do this because we HAVE learned the lessons of the past. You've got it all backwards, man.



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