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Just to sum up this entire thread at the start to save you reading through: Black/No Stripe or Black Dot - Essentially the original schematic based off the incorrect IIC+ schematic with R130 and R126 for R2 channel. C214 added in later for R2 channel on transition models between late 85 and...

One for the engineers out there! If you look up any schematic out there for the IIC+ and the III you'll see there is a 1.5K resistor in the power section going to ground. The IIC+ and III power sections are identical in these schematics with this 1.5K going to ground in both. However, I've...

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...

Hi Guys, I've finally finished tracing my III Black Stripe and drew up a schematic. (well about 95% done technically! Some final things to finish off and double check) Everything with a R, C or D, LDR etc number has been verified and traced by me. This includes LDR supply, EQ etc and should...

Hi Guys, I was so annoyed with all the misinformation out there that I've drawn up an accurate IIC+ schematic of the main sections. This includes information I can find regarding the ++ mods. This is taken from info I can find on here from chipaudette who had an RP10A IIC converted to a IIC+ by...

I started tracing my Early 86 Black Stripe over the weekend as I feel it would be good to have a verified III schematic out there if anyone is interested. It'll be as a TinyCAD file and I would love for people to copy it and use it as a basis for getting some verified schematics of the different...

Hi guys, I'm planning on doing a full Mark III to IIC+ conversion (I got an early black stripe combo for a steal price recently with one of the early higher voltage IIC+ transformers!) Apart from the schematic differences such as component values and some slight circuitry difference, is there...