MK II C Mysteries

Mark I's, II's, III's and the almight IV

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Ronco
Bottle Rocket
Posts: 19
Joined: Sun May 11, 2008 11:37 am

MK II C Mysteries

Post by Ronco » Thu Sep 20, 2018 5:26 pm

I own a near mint MK II C ( NOT C+)
I have been trying to find a good schematic for the plain ole II C for YEARS.

Does anyone out there know where I can find a schematic for the II C ?

There are zillions of IIC+ schematics on the NET for the IIC+ but NONE ( that I can find ) for the IIC.
Hard to believe that Mesa manufactured over 1000 IIC and there is no schematic ??

Also would love to find good documentation/ drawings /schematic and notes on the famous Mike B conversion from IIC to IIC+

Any replies/ comments /info greatly appreciated !
Ronco

jrb32
Mark III
Posts: 204
Joined: Wed Jan 31, 2018 8:32 am

Re: MK II C Mysteries

Post by jrb32 » Fri Sep 21, 2018 5:35 am

No official one out there supposedly but chipaudette traced theirs:

https://get.google.com/albumarchive/109 ... MQIdPUFDaV

They then traced the follow up when Mike B upgraded it to IIC+

viewtopic.php?f=27&t=40649&start=0

Hope that helps!

jrb32
Mark III
Posts: 204
Joined: Wed Jan 31, 2018 8:32 am

Re: MK II C Mysteries

Post by jrb32 » Tue Dec 11, 2018 5:51 am

I bought an SRGX '83 IIC and traced it. Board view and schematic here:

RP10 IIC Schematic: https://drive.google.com/open?id=1mpJFs ... 81rlggkt6M

RP10 IIC Board Layout: https://drive.google.com/open?id=1Lx0Ao ... V5IgEUf5cS

I'll do the same for the IIC+ RP10 once I do the upgrade.

Cheers,

Jon
Last edited by jrb32 on Mon Mar 04, 2019 7:44 am, edited 1 time in total.

jrb32
Mark III
Posts: 204
Joined: Wed Jan 31, 2018 8:32 am

Re: MK II C Mysteries

Post by jrb32 » Mon Mar 04, 2019 7:44 am

RP11A IIC Schematic: https://drive.google.com/open?id=1_KWgn ... l8qHdo5nji
RP11A IIC Layout : https://drive.google.com/open?id=1CALq ... 8LQ627h54b

The IIC schematic for the RP11 is the best I can get it without tracing one first hand. Looks like there is some weird stuff going on with the Lead Pull Bright as opposed to the RP10 board, but is very similar to the RP10 apart from that. It also has all of the EQ, automatic treble shift, V2A/B rearranged and power section already at IIC+ specs. Like it was designed with the + upgrade in mind unlike the RP10 board...

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