Mark IIC+ - Guide for Dummies

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

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SD Boogie
Mark I
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Re: Mark IIC+ - Guide for Dummies

Post by SD Boogie » Tue Dec 21, 2010 5:32 pm

I have a IIC+ with seriel 14,2xx. The chassis has D3 handwritten on both sides of it....any idea what I have? I dont see this code in the "Mark series for dummies" sticky

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lesterpaul
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Re: Mark IIC+ - Guide for Dummies

Post by lesterpaul » Tue Dec 21, 2010 7:22 pm

..copied and pasted from the "Guide"...
You could get a standard 60 or 100 watt with no graphic or reverb so there are possible S, D and H only chassis codes. Any amp could have an export power transformer, so an X is possible as well. For example, SX, DX and HX.

A 15” could be added to the chassis code designating a long chassis.

The Number after chassis code –

This is the week of production.
"major scales...whats that??"-Doug Aldrich
C+ DRG,B+DGX,C+KRG(Twocious Maximus)
TA-15,Bray, SLO, Glaswerks SOD
-black cat bone for good luck

Skyless7620
Mark III
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Re: Mark IIC+ - Guide for Dummies

Post by Skyless7620 » Fri Dec 24, 2010 7:04 pm

av8or3 wrote:FWIW, a 100 watt C+ sold recently on e-bay had the
serial number 14,387. That's the closest one I've seen
to the end of the line. It was a DRGX.
Nice amp too......
See 'ya,
Jim
Don't mean to be nitpicking, but I'm pretty sure it was an HRGX. I know because I had the opportunity to buy it from a previous owner :)

Happy Holidays!

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mule#1
Mark IV
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Re: Mark IIC+ - Guide for Dummies

Post by mule#1 » Sat Jun 18, 2011 6:38 am

Much Thanks for this original post! It helped me feel comfortable in buying my IIC+ this week!

MK V Head
MK V Quilted Bubinga Combo
Marshall 410H
Marshall 410HJS
Mesa 2X12 Metal Grill Cabs
Standard 4x12 (Slant) & 2x12 (Horiz)
Traditional 4x12 (straight)
Gibson Les Paul's,SG, Explorer, Firebird, ES-339


http://www.paradoxxroxx.net

revgsmall
Mark III
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Re: Mark IIC+ - Guide for Dummies

Post by revgsmall » Wed Aug 17, 2011 9:49 am

New here, but a decades long mark series user. Great post, I must have a rare one. Mine DOES have the initials RCS on it. It is a 100/60 watt, non eq, non simuclass, serial # 13894. I had three of these amps at one time (when I was rich). Kept the best sounding one.

nogalian
Mark II
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Joined: Sat Jan 02, 2010 10:42 am

Re: Mark IIC+ - Guide for Dummies

Post by nogalian » Sun Jan 01, 2012 5:39 pm

Thanks a MILLION!!! Been looking for this info for a while. You should write a book! Hey you kinda did!!
Thank you for you incredible efforts!! :!:
Mesa 5:25 Express Plus
Mesa TA-30 with 2 1x12's
Mark V Head + 1x12 Trans Black Flame Maple
Way more than I can play at once!! But I try!! :)

oyrgawd
Mark I
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Re: Mark IIC+ - Guide for Dummies

Post by oyrgawd » Tue Aug 07, 2012 8:25 pm

Boogiebabies wrote:
The Loop Test

1) Plug your guitar into the Effects Return jack
2) Switch to lead mode
3) Turn the Lead Drive and Gain controls with a note ringing.
4) If they have NO effect on the volume and sound you have a+.
Can I get a clarification on this? I was looking at a IIC at a shop today. I didn't check the serial or look for a "+". I did do the loop test as listed above, but I'm not sure about step 3. With the guitar plugged into the fx return in Lead mode, the Lead Drive knob did nothing, the Lead Master was just signal/no signal as I turned it from zero, but Master 1 and Volume 1 changed level a lot. There's no knob labeled "Gain" though, so I'm not sure what the test's result is.

It's a 60-watt combo with EV, no reverb, no GEQ. Labeled Gain Boost versus Pull Deep.

It sounded pretty great but I'd have to bring my guitar in to decide. I'm a little worried I'd miss the 4x6L6s and Simul-Class from the III/IV/V but maybe not. I like the simplicity of shared controls again, coming from the V.

EDIT: Come to think of it, the knob tops were shiny and there wasn't a Pull Shift over the Bass, so it's probably a IIB. Does my test mean it might've been modded or is that normal IIB loop behavior?

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Rhoads
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Re: Mark IIC+ - Guide for Dummies

Post by Rhoads » Tue Oct 16, 2012 6:29 am

I buy a Mark IIC two week ago serial 1229x export, EQ, all the thing that you can imagne ok the real thing !!! And date on it was 2/84 and i have a black Dot on the power ! I give more info about this monster ( i dont have the chance to try it, i work too much) :D
https://www.youtube.com/watch?v=Tj5DYsjq08o

Mark IIC+ DRGX Head (GTS Headshell)
Mark IVA Head
Mark III REDandGreen stripe head
Thiele wide EV
Recto 4x12 Cab

rlhjr34
Mark I
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Joined: Mon Jul 12, 2010 7:37 am
Location: Rockwall, Texas

Re: Mark IIC+ - Guide for Dummies

Post by rlhjr34 » Tue Dec 04, 2012 7:51 pm

My SR head arrives tomorrow. Would like to have the GEQ otion or even the Hundred watt version. You know what though it sure is better than wanting a C+ but not having one! I'll be adding a parametric EQ to the loop so I should be just fine. Can hardly stand the wait. Feel like a kid on Christmas Eve right now. 8)

AZToo
Bottle Rocket
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Re: Mark IIC+ - Guide for Dummies

Post by AZToo » Fri Dec 14, 2012 5:55 pm

is a Boogie with a 4/20/79 chassis date most likely a Mark II? A?
Can this amp be modded to IIc+ specs?

36-22-36
Bottle Rocket
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Re: Mark IIC+ - Guide for Dummies

Post by 36-22-36 » Sun Apr 14, 2013 3:55 pm

Boogiebabies wrote:The IIC+ Guide

The Schumacher Transformers –

The digits 606 are Schumacher’s EIA manufacturer code.

The digits after are the last number of the production year, example, 3 is 1983. The next two digits are the week of productions, example, 42 is the 42’nd week of 1983. It’s not the Fibonacci Sequence, trust me. EIA 606-342.

60W OT - T60-152019
Simul Output - SC-152019B – Simul-Class
180W - SD 190555 Coliseum

60W PT - 00-162310 - 448V
60W Export - PT: X62-162318 - 448V
Early 100 - 100-162318 - 448V
Simul/60-100 Power - 105-162318 -483V+
- X101-162318 – Export - 448-460V
180W - 0180322 Coliseum - 500V+

Some early IIC+’s may have leftover 100 power transformers.
[/b]
100/60W OT - T100-152019

Cheers :)

Boogie-fever
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Re: Mark IIC+ - Guide for Dummies

Post by Boogie-fever » Mon Apr 22, 2013 12:00 am

There seems to be a discrepancy here regarding the 2c+, simul-class output transformers. I want to get to the bottom of this...
I believe the proper simul-class output transformers are T100-152019, perhaps some of the 2c+'s had 562003's as well.

Boogie-fever
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Re: Mark IIC+ - Guide for Dummies

Post by Boogie-fever » Mon Apr 22, 2013 8:09 pm

So as it turns out I was mistaken. The T100-152019 output transformer, is for a 60/100, amp.
Whereas the 562003, is the original simul-class output transformer used on the 2c+.
There's been some conflicting information on the Internet pertaining to this so I just want to clarify the info, after speaking with Mike B, today!

gts
Mark IV
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Re: Mark IIC+ - Guide for Dummies

Post by gts » Thu May 02, 2013 5:37 pm

Boogie-fever wrote:So as it turns out I was mistaken. The T100-152019 output transformer, is for a 60/100, amp.
Whereas the 562003, is the original simul-class output transformer used on the 2c+.
There's been some conflicting information on the Internet pertaining to this so I just want to clarify the info, after speaking with Mike B, today!
You are still mistaken and/ or perhaps you misunderstood Mike. :oops:

The "562003" Simul-Class OT was introduced with and first used during the production of the Mark III and not on IIC's

The Simul-Class IIC+ had the "SC-152019B" OT.

Now some 60/100 watt IIC+'s may have been modded/ upgraded to a Simul-Class during the production of Mark III's
If this was the case it is very likely a "562003" Simul-class OT was used.

Fwiw the "562003" Simul Class OT and the "SC-152019B" Simul-Class OT have the same specs.

You can trust the info on the first page of this thread!! :twisted:
It is VERY Accurate and written by a VERY Knowledgeable and reliable source!!

So.... believe what you read here and not that "conflicting information on the internet." :wink:

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Boogiebabies
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Re: Mark IIC+ - Guide for Dummies

Post by Boogiebabies » Fri Nov 22, 2013 8:08 pm

Better late than never, the T100-152019 only has two primary taps so it could be used in a 60W, but it would be a tad over rated for the amp. The SC-152019B has four primaries, two for the 6L6 impedance and two for the EL34 impedance. If you look at the primaries on eith a 60W or 100W transformer they are red/red wires and jumped to the outer sockets with a wire on 100W models. The Simul OT is blue/red/red/blue, or one for each tube. As for upgrading a 60W to a hundred watt, I don't even think the factory would want to remove the power amp board and chassis punch two extra slots.

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