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PostPosted: Tue Feb 20, 2018 8:41 am 
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Mark II

Joined: Wed Jan 31, 2018 8:32 am
Posts: 94
Hi Guys,

I was so annoyed with all the misinformation out there that I've HOPEFULLY drawn up an accurate IIC+ schematic of the main sections. I say hopefully because I do not own a IIC+ and cannot verify this info. This is taken from info I can find on here from chipaudette who had a IIC converted to a IIC+ by Mike B and all the great IIC+ info from Boogiebabies that's on here. Thanks so much for this info!

It's also taken from my experience of verifying my Early III Black Stripe, the mainly accurate schematic from the sloclones forum and chipaudette who drew up a IIC schematic here and took some gut shots: https://get.google.com/albumarchive/109 ... source=pwa

Please let me know if there are any errors. But please only from someone who has a genuine IIC+ to verify with!

Anyway the schematic is here. Hope it's of use to someone!

EDIT Link updated to include correct EQ and Power Section, along with a few corrections from info out there. This includes, hopefully, the mystery EQ cap everyone keeps talking about! As long as it's the same as on a IIC because that's where I'm basing the info from.

It also gives info on the ++ Mod. There seem to be two versions so have included both. One involves a simple addition and the other includes adding a relay to switch similar to the Mark III.

I have no concrete info on the Reverb or the High Voltage Supply for a IIC+ so cannot compare these at the moment. Apart from that is pretty much as accurate as you'll get until someone traces theirs or offers me one to trace 8)

PDF: https://drive.google.com/open?id=1ljGYj ... HIuMjGJ34C

Thanks,

Jon


Last edited by jrb32 on Thu Apr 19, 2018 6:32 am, edited 7 times in total.

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PostPosted: Tue Feb 20, 2018 12:51 pm 
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Mark II
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Wow. Great work! I wish I even remotely knew what any of that means. Hahha.

Would be awesome to be able to troubleshoot my amps instead of just changing tubes and hoping that fixes the problem. :lol:

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PostPosted: Thu Feb 22, 2018 9:59 am 
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Mark IV
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Awesome!!!!

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PostPosted: Fri Feb 23, 2018 12:03 am 
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Mark II

Joined: Thu Feb 22, 2018 11:37 pm
Posts: 59
This was really useful for me for comparing my Mark III for the + mod!

The 100k resistor after the volume you've labelled as optional, is that for the ++ mod? It's not on the other schematics I've seen or anything for the Mark IIIs.


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PostPosted: Fri Feb 23, 2018 7:54 am 
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Mark II

Joined: Wed Jan 31, 2018 8:32 am
Posts: 94
Quote:
The 100k resistor after the volume you've labelled as optional, is that for the ++ mod? It's not on the other schematics I've seen or anything for the Mark IIIs.


It's a remnant of upgrading a IIC to a IIC+ that Mike B leaves in. Info I got was from here: http://forum.grailtone.com/viewtopic.ph ... 49&start=0

I don't think it has anything to do with the ++ mod but certainly wouldn't harm anything and would definitely add some gain when combined with a 10pF on V2! Try it and see :)


Last edited by jrb32 on Fri Jun 01, 2018 7:55 am, edited 1 time in total.

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PostPosted: Thu Apr 12, 2018 7:34 am 
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Mark II

Joined: Wed Jan 31, 2018 8:32 am
Posts: 94
Link updated to include correct EQ and Power Section, along with a few corrections from info out there. This includes, hopefully, the mystery EQ cap.

It also gives info on the ++ Mod. There seem to be two versions so have included both. One involves a component addition and the other includes adding a relay to switch similar to the Mark III.

I have no concrete info on the Reverb or the High Voltage Supply for a IIC+ so cannot compare these at the moment. Apart from that is pretty much as accurate as you'll get until someone traces theirs or offers me one to trace 8)

https://drive.google.com/open?id=1ljGYjZx_34k5PMcLGT97brHIuMjGJ34C (same as link above - updated that as well)

Thanks,

Jon


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