Mark IIC+ type build

CrunchBerries · Post by **CrunchBerries** » Wed Apr 22, 2015 9:41 am

Transformers are going to show up today, I have a custom aluminum chassis getting folded similar to mark specs. The amp will essentially be a mark iic+ with a separate tone stack for cleans. The graphic eq might end up being regular pots instead of sliders but we shall see. I am leaning toward the use of sliders if I am going to do this right.

Heaters will be similar to SLO, but with the heaters run at the centers of sockets instead of outers of sockets. Still debating a few design considerations. I am looking at the large JJ can caps for input filtering, or maybe the smaller axial F&T. I also might have to adjust the heater voltage if it is higher than the 6.3.

This should be fun.

CrunchBerries · Post by **CrunchBerries** » Wed Apr 22, 2015 9:06 pm

Transformers are quite large... classictone 18004 PT and 18013 OT. Both are nice and heavy, look and feels like quality. I am glad I got these.

Steinmetzify · Post by **Steinmetzify** » Wed May 13, 2015 7:31 pm

What happened with this? Getting interested in IIC+s lately...

Tortuga · Post by **Tortuga** » Wed May 13, 2015 8:09 pm

Whoa cool! In! :snax:

CrunchBerries · Post by **CrunchBerries** » Wed May 20, 2015 9:52 am

Chugging along, I am getting a chassis custom built for this. Rough draft done in .034, they are going to make a welded .08 aluminum version of it. Should be awesome. Still working out some details as for the design, more parts being ordered shortly.

CrunchBerries · Post by **CrunchBerries** » Mon Jun 15, 2015 4:55 pm

Chassis in:

Painted matte brown, some hardware installed, power tube heater wiring done:

CrunchBerries · Post by **CrunchBerries** » Tue Jun 16, 2015 4:51 pm

Heaters all wired:

CrunchBerries · Post by **CrunchBerries** » Tue Dec 15, 2015 12:18 pm

Wife just ordered my parts list for XMAS!! OOhhhh boy... progress ahead!

RyanDistortion · Post by **RyanDistortion** » Tue Dec 15, 2015 1:10 pm

mortatone · Post by **mortatone** » Tue Dec 15, 2015 1:47 pm

Oooooooooooo

JerEvil · Post by **JerEvil** » Tue Dec 15, 2015 2:00 pm

I SERIOUSLY hope you de-burred all this holes...

mortatone · Post by **mortatone** » Tue Dec 15, 2015 3:31 pm

JerEvil wrote:I SERIOUSLY hope you de-burred all this holes...

A penis head is very effective at finding any missed burrs.

The more you know.. :usa:

CrunchBerries · Post by **CrunchBerries** » Sat Jan 16, 2016 7:34 pm

Progress... and quick dry run. Sounds like a MRAK. That aggressive mid crunch with some tight chest punch. Still have to troubleshoot EQ as its not working properly. Gut pics are from yesterday, today I added the EQ and hooked up all the odds and ends. Works and deadly silent - but as I said - EQ knobs all act very funny unless at the middle position.

Still have to install the switches, relays and channel LED's.

RyanDistortion · Post by **RyanDistortion** » Sat Jan 16, 2016 7:44 pm

Looks faptastic!

TurboPablo · Post by **TurboPablo** » Sat Jan 16, 2016 8:10 pm

Nice work.

Post clips of brutality.

CrunchBerries · Post by **CrunchBerries** » Sun Jan 17, 2016 7:03 pm

Clips soon.. can't get the eq going - I'll just redo it - I wasn't happy with how it turned out anyways.

So I am playing this with the GEQ bypassed.. holy shit this thing sounds pissed off! It wants to reach out and punch you. So juicy and full of harmonics.

TurboPablo · Post by **TurboPablo** » Sun Jan 17, 2016 7:35 pm

God I can't wait to get my MarkIII.

CrunchBerries · Post by **CrunchBerries** » Sat Jan 30, 2016 6:52 pm

Some schems

CrunchBerries · Post by **CrunchBerries** » Sat Jan 30, 2016 6:53 pm

Rest of schems... all modified from mkIV schematic. A few mistakes in the schems, but pretty much what I built.

Tortuga · Post by **Tortuga** » Sat Jan 30, 2016 9:54 pm

I took the chassis out of my Mark III yesterday - was surprised to see the transistors in there. Great timing on this posting - assuming mine is similar to your diagrams above, they must be for the EQ.

Thanks man! Great thread!

ajaxlepinski · Post by **ajaxlepinski** » Sat Jan 30, 2016 9:59 pm

Whoa dude! That looks awesome! Two chokes? What up wit dat?

CrunchBerries · Post by **CrunchBerries** » Sun Jan 31, 2016 8:56 am

ajaxlepinski wrote:Whoa dude! That looks awesome! Two chokes? What up wit dat?

The big one is a choke, small one is separate 12V circuit for relays to avoid noise.

Meelocheck · Post by **Meelocheck** » Sun Jan 31, 2016 11:11 am

That thing is tight. Looks awesome.

CrunchBerries · Post by **CrunchBerries** » Sun Jan 31, 2016 1:48 pm

Thanks, I still have a bit of work to do on it, tidy it up and make it a bit prettier before making the headshell for it. I'm thinking maybe "a-la fender" tweed.. Should be fun!

ajaxlepinski · Post by **ajaxlepinski** » Sun Jan 31, 2016 5:49 pm

CrunchBerries wrote:
ajaxlepinski wrote:Whoa dude! That looks awesome! Two chokes? What up wit dat?

The big one is a choke, small one is separate 12V circuit for relays to avoid noise.

A separate 12V circuit for relays!?!?! :idea:

I've been using this gif a lot lately....

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