Marshall - Bluesbreaker II (BB-2)

All about modern commercial stompbox circuits from Electro Harmonix over MXR, Boss and Ibanez into the nineties.
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goaltoday
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Post by goaltoday »

Hi! A friend of mine wants to change the range of the tone control. Anyone has got the schematic?

Some pictures he posted:

https://img209.imageshack.us/my.php?ima ... ll2jb5.jpg

https://img48.imageshack.us/my.php?imag ... acana3.jpg

https://img115.imageshack.us/my.php?image=c12gk5.jpg

Million thanks!

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The Rotagilla
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Post by The Rotagilla »

Try emailing Marshall tech support. I've found them very helpful in the past.

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goaltoday
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Post by goaltoday »

I'll try that. Thanks!

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N0F1
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Post by N0F1 »

Hi goaltoday, did you get the schematic ?
I have one i'd like to mod.
Thanks.

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goaltoday
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Post by goaltoday »

Yes. Someone send it to me but later I tried emailing Marshall tech support as Rotagilla told me and they send it me too. So just email them, very nice peolple. :D

If they don't send it to you PM your mail. :wink:

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N0F1
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Post by N0F1 »

Well i wanted to spare some time to their tech support, but finally i just emailed them. :lol: I'll get back to you if they dont answer. Thanks.

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N0F1
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Post by N0F1 »

They sent the schemo... this thing is straying away from the original BB...

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frank.clarke
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Post by frank.clarke »

Unless they have changed everything, the cap on the tone control would be worth looking at.
What is the clean boost, just a diode lift?

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N0F1
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Post by N0F1 »

Unless they have changed everything, the cap on the tone control would be worth looking at.
There's a fet/tranny arrangement which i think emulates a cathode follower to drive some kind of "FMV" tonestack.
What is the clean boost, just a diode lift?
I'm afraid not.

There you go :
http://thebin.free.fr/FSTBX/bb2.pdf
:)

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frank.clarke
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Post by frank.clarke »

Thanks, I'm flabbergasted :). Boost is the second opamp stage and tonestack bypassed, and something like a Vox tone stack. Well I never, thanks for the schematic!

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bajaman
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Post by bajaman »

a very interesting snippet - the fet gain stage followed by the bipolar buffer driving the tone stack - hmmmm :wink:
bajaman

ps: very stable feedback biasing - a very useful fet gain stage - I wonder how it would sound in a ROG type amp sim circuit :?: :wink:

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frank.clarke
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Post by frank.clarke »

I was wondering why they didn't do that on the Guv'nor Plus, but they rescaled it's tone stack instead, everything got multiplied by 10 (And a bass boost after the volume control, weird). If it isn't broke don't fix it. I would slap people for making "improvements" that change the sound of a successful product. But maybe it sounds so much better, I don't have all the boxes to compare. Sill, I like the Marshall boxes.

<edit: I got a cheap GV-2, it cuts treble in more than one place where it shouldn't. I made major EQ changes on it today. I'll have another listen in the morning.
Yup, just like a chicken sandwich, or the 18th century government.>

Here we go with doubletracked direct-to-soundcard Modded Guvnor GV-2, some poor quality echo on one track:
http://www.guitar-pedals-effects.com/Warrior3.mp3
Last edited by frank.clarke on 03 Dec 2007, 10:52, edited 5 times in total.

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Redhouse
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Post by Redhouse »

frank.clarke wrote:I was wondering why they didn't do that on the Guv'nor Plus, but they rescaled it's tone stack instead, everything got multiplied by 10 (And a bass boost after the volume control, weird). If it isn't broke don't fix it. I would slap people for making "improvements" that change the sound of a successful product. But maybe it sounds so much better, I don't have all the boxes to compare. Sill, I like the Marshall boxes.
To tangent slightly, I'd like to slap the dumb arse at Wendy's that changed their chicken sandwich. For years thay had the best chicken sandwich, then like in ''03 or '04 it changed, has been not the best ever since....dumb arse's.

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Post by marushio_rima »

goaltoday wrote:Hi! A friend of mine wants to change the range of the tone control. Anyone has got the schematic?

Some pictures he posted:

https://img209.imageshack.us/my.php?ima ... ll2jb5.jpg

https://img48.imageshack.us/my.php?imag ... acana3.jpg

https://img115.imageshack.us/my.php?image=c12gk5.jpg

Million thanks!

lost images :cry: :cry: :cry: :cry: :cry: :cry: :cry: :cry:

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marushio_rima
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Post by marushio_rima »

frank.clarke wrote:I was wondering why they didn't do that on the Guv'nor Plus, but they rescaled it's tone stack instead, everything got multiplied by 10 (And a bass boost after the volume control, weird). If it isn't broke don't fix it. I would slap people for making "improvements" that change the sound of a successful product. But maybe it sounds so much better, I don't have all the boxes to compare. Sill, I like the Marshall boxes.

<edit: I got a cheap GV-2, it cuts treble in more than one place where it shouldn't. I made major EQ changes on it today. I'll have another listen in the morning.
Yup, just like a chicken sandwich, or the 18th century government.>

Here we go with doubletracked direct-to-soundcard Modded Guvnor GV-2, some poor quality echo on one track:
http://www.guitar-pedals-effects.com/Warrior3.mp3

broken link :cry: :cry: :cry: :cry: :cry: :cry: :cry:

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