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PostPosted: Thu May 24, 2018 4:15 pm 
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Bottle Rocket

Joined: Thu May 24, 2018 4:08 pm
Posts: 2
Greetings all,

Picked a Mesa Boogie "Son of Boogie" 1x12 combo yesterday on the cheap (400 bucks). It is a 4x6L6 combo, Simul Class amp with a Black Shadow speaker. Don't know too much about these so, just wanting to know more about it, which tubes are working for everyone, schematic and such. I got some info on TGP and wrote Mesa themselves for info but this was their reply:

Garey Noble (MESA/Boogie)

May 24, 13:58 PDT

Hi Giordano,

Unfortunately, there is not much material available for the SOB. You may want to refer to the Mark I Reissue material for reference.
Please let me know if you have any questions or need assistance in any way. Thanks!

Garey Noble
Product Specialist | Artist Relations
Mesa/Boogie, Ltd.
1317 Ross Street | Petaluma, CA 94954 USA
http://www.mesaboogie.com

Educate me, Boogie experts! Oh for those of you who have never seen a S.O.B with Simulclass, here it is:

Image

https://imgur.com/a/4dwL7b5#QGgJjNI


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PostPosted: Thu May 24, 2018 4:43 pm 
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Mark IV
User avatar

Joined: Wed Sep 08, 2010 4:12 pm
Posts: 657
Location: Petaluma, California
macg1 wrote:
Greetings all,

Picked a Mesa Boogie "Son of Boogie" 1x12 combo yesterday on the cheap (400 bucks). It is a 4x6L6 combo, Simul Class amp with a Black Shadow speaker. Don't know too much about these so, just wanting to know more about it, which tubes are working for everyone, schematic and such. I got some info on TGP and wrote Mesa themselves for info but this was their reply:

Garey Noble (MESA/Boogie)

May 24, 13:58 PDT

Hi Giordano,

Unfortunately, there is not much material available for the SOB. You may want to refer to the Mark I Reissue material for reference.
Please let me know if you have any questions or need assistance in any way. Thanks!

Garey Noble
Product Specialist | Artist Relations
Mesa/Boogie, Ltd.
1317 Ross Street | Petaluma, CA 94954 USA
http://www.mesaboogie.com

Educate me, Boogie experts! Oh for those of you who have never seen a S.O.B with Simulclass, here it is:

Image

https://imgur.com/a/4dwL7b5#QGgJjNI


Correct. There simply is not much info we have on the SOB. No manual, no schematic. Sorry I couldn't offer you more... :roll:

_________________
MESA/Boogie - Product Specialist/Customer Service - http://www.mesaboogie.com/support/index.html


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PostPosted: Thu May 24, 2018 5:30 pm 
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Bottle Rocket

Joined: Thu May 24, 2018 4:08 pm
Posts: 2
Authorized Boogie wrote:
macg1 wrote:
Greetings all,

Picked a Mesa Boogie "Son of Boogie" 1x12 combo yesterday on the cheap (400 bucks). It is a 4x6L6 combo, Simul Class amp with a Black Shadow speaker. Don't know too much about these so, just wanting to know more about it, which tubes are working for everyone, schematic and such. I got some info on TGP and wrote Mesa themselves for info but this was their reply:

Garey Noble (MESA/Boogie)

May 24, 13:58 PDT

Hi Giordano,

Unfortunately, there is not much material available for the SOB. You may want to refer to the Mark I Reissue material for reference.
Please let me know if you have any questions or need assistance in any way. Thanks!

Garey Noble
Product Specialist | Artist Relations
Mesa/Boogie, Ltd.
1317 Ross Street | Petaluma, CA 94954 USA
http://www.mesaboogie.com

Educate me, Boogie experts! Oh for those of you who have never seen a S.O.B with Simulclass, here it is:

Image

https://imgur.com/a/4dwL7b5#QGgJjNI


Correct. There simply is not much info we have on the SOB. No manual, no schematic. Sorry I couldn't offer you more... :roll:



No worries whatsoever. I totally understand. Just figured some current and former owners could chime in. By the way, thank you for the very quick reply also. This level of customer service is pretty incredible these days. Maybe there will be newer Mesa amps in my future.


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PostPosted: Sat Jun 16, 2018 11:14 pm 
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Mark II

Joined: Fri May 04, 2018 10:36 pm
Posts: 64
I've been the proud owner of a 60 watt SOB for a number of years. They're simple amps but when they're right, they're RIGHT. Tone like an angry god looking to kill something.

The schematics...there are schematic repositories that have it. Easy Google search.

One word of advice: The SOB seems to be very sensitive to the condition of its filter capacitors. If the overdrive is harsh or rough, the first thing to look at after tube condition is those filter caps. In general, if they're more than 10 years old they need to be replaced.

I recapped mine recently and it got a lot smoother but it will never have the smooth lead tone that SOME amps are known for. It's always more bold and aggressive than that even when set up to do an edge of distortion tone.


There's a video on youtube demonstrating a '74 Mark 1. Sounds fantastic. Allowing for the speaker differences, my SOB sounds a lot like that one.


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PostPosted: Mon Jul 09, 2018 11:02 pm 
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Mark II

Joined: Fri May 04, 2018 10:36 pm
Posts: 64
A little update: My SOB has never had what I'd call a really smooth sounding overdrive. Even with good glass and fresh caps, it's been a bit raw and brutal. So I did some investigating and found that the primary cause of this harshness is a .003 uF disc capacitor which bypasses a 220K resistor which in turn connects thru a .047 uF capacitor which connects to the plate (pin 6) on V2B. Remove that capacitor and the tone is greatly improved just by that single change.

I'm looking at other options for further tone improvements as well, but simply yanking out that one capacitor took the amp's tone to a totally new (and better) level.


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