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PostPosted: Fri Nov 30, 2018 10:53 am 
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Mark II

Joined: Wed Jan 31, 2018 8:32 am
Posts: 127
So I've been going through the steps required to the C+ upgrade on my '83 IIC with the RP10A and I just wanted to share how ridiculous these are! I have no idea what Mike B was on back then but if you think it's just a few component changes or an FX loop/Reverb swap think again.

I've counted just under 40 steps from looking at pictures of an upgraded RP10A and comparing them to some schematics of the IIC I based on the chipaudette ones to try and get my head round it all. I also drew up a corresponding board layout. It involves V2A and B being swapped around completely, traces being destroyed on the board, jumper wire and hook up wire everywhere.

I don't really want to post a step by step guide, especially for those in the US who can send this to Mike B (sending to Petaluma is not really a viable option for me), but definitely everyone appreciate the hard work and effort required to do the + upgrade and the genius that went into this creation.

I'll stick up a board layout and schematic for the RP10A and RP11A boards for maintenance and general information in the next few weeks. This is for the C and the C+ for the RP10A and the C+ for the RP11A (I don't have any information on an RP11A C and would be guessing). If anyone wanted to do the mod work themselves (or even downgrade to a C if you wanted) you can analyse them both but I'm not doing a step by step for dummies guide or anything to stop people destroying their amps if they don't know what they're doing. I just think it's nice to document these 30+ year amps as much as possible for the future.


Last edited by jrb32 on Mon Dec 17, 2018 4:22 am, edited 1 time in total.

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PostPosted: Wed Dec 05, 2018 3:40 pm 
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Donating Member

Joined: Sat Jun 16, 2007 3:27 pm
Posts: 173
Location: Australia
That would be very cool

_________________
Mesa Boogie Studio .22C+ Head
Axe fx 2
Mesa Boogie Quad Preamp with C+ Mod


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PostPosted: Tue Dec 11, 2018 5:34 am 
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Mark II

Joined: Wed Jan 31, 2018 8:32 am
Posts: 127
RP10 IIC Schematic: https://drive.google.com/open?id=1mpJFs ... 81rlggkt6M
RP10 IIC Board View: https://drive.google.com/open?id=1Lx0Ao ... V5IgEUf5cS

RP10A IIC+ Board Layout: https://drive.google.com/open?id=1dyC8zXSQ8Ta8Gg-TDZPpQb3j4_4PnjHk
RP10A IIC+ Schematic: https://drive.google.com/open?id=1Z0-2LdLlP0GLd5otlq_kVX8XQX49nUWV

Hope that helps someone out there do some maintenece/repair if needed.

If you're looking into doing a C to C+ upgrade there are a load of wire placements and moves you need to sort too so don't think you can just do these changes to the board it'll work. It won't. Don't even try unless you know what you're doing. ALWAYS send it to Mike B if possible.

Cheers,

Jon


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