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New DIY modular bass amp

 
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Emperor-TK
RM20


Joined: 15 Apr 2015
Posts: 20
Location: NJ, USA

PostPosted: Thu May 14, 2015 12:17 pm    Post subject: New DIY modular bass amp Reply with quote

I'm approaching the finish of my DIY modular bass amp and I thought that some here might be interested in the project (if not here, then where else? Wink )

At first, I was just going to use an RM4 with a big solid state power amp, but I really wanted a couple of features that rig couldn't provide. That combo was too big, actually being wider than my 18" wide bass cabinet. Also, I would never need four modules for bass, but I wanted to use dual channel modules. This led me to whip up the following amp.

The amp uses a pretty typical RM4 type front end with a few minor changes. I don't really care for the switching on my MOD50, with a switch for each channel. Instead, I wanted A/B switches, one for the module, and one for the channel. Now I can use only a dual footswitch to control a double module dual channel amp. I don't need midi on the amp, so I went with basic relay switching for the logic signals to the modules. The relays are controlled by a programmable logic chip using momentary switches to change states. This way I could have redundant switches on the front of the amp and on a foot pedal like the original.

For the power amp, I went with a 500W ICEpower/Bang and Olufsen Class D amp that has been showing up in a bunch of commercial products these days. I used the 200W version in another build, and I'm pretty happy with the performance.

There's still a couple things left to do. I need to upgrade my 12V transformer because I ran out of juice (hence the lack of tubes in module 2). I have one on order that has roughly the same footprint. I also want to add a DI out and a built in tuner. The three LED holes on the front are for the tuner, and I have a relay installed to switch the input signal between the tuner and amp. I hacked up an old Sabine and it works, but the clock is injecting digital noise into the circuit that I need to suss out. I removed it from the amp in the mean time.

Anyway, I used it at rehearsal last night, but the Vox module doesn't have quite enough low end for me. Bass-centric modules are next on my list, starting with the Fender Dual-Showman/Alembic F2B circuit that I used in my last build. That sucker has a nice fat low end.

For years I used a '73 Marshall as my bass amp, sometimes with an extra Ampeg V4B to round out the bottom. I plan on doing some bass modules for myself based on guitar amps, but with blend knobs to blend in the clean sound for deeper lows. However, the one thing that everyone gets wrong with blend knobs on bass overdrives IMHO is that they blend in the full frequency clean sound. This never sounds good to me. It's a clean sound disconnected from an unrelated over-driven sound. I'm going to do a low pass clean sound for the blend so that the clean just fattens up the overdrive a bit without adding any real timbre to it.










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Emperor-TK
RM20


Joined: 15 Apr 2015
Posts: 20
Location: NJ, USA

PostPosted: Thu May 14, 2015 2:17 pm    Post subject: Reply with quote

Fixed my broken picture links, I think.
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MarcoR
Donating Member


Joined: 02 May 2007
Posts: 829
Location: Frederick, MD

PostPosted: Thu May 14, 2015 3:06 pm    Post subject: Reply with quote

Yes, the pics work now.

That is ridiculously killer!!! I wish I had the skill to do that...

Great job man!!
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goldtop
RM20


Joined: 09 Apr 2015
Posts: 18
Location: Cambridge, England

PostPosted: Fri May 15, 2015 3:37 am    Post subject: Reply with quote

Excellent work, Emp! Bookmarked to come back and pore over later! Smile
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JackTheLad
RM20


Joined: 19 Feb 2016
Posts: 13

PostPosted: Tue Jun 28, 2016 5:52 am    Post subject: Reply with quote

1) This is awesome! Great job!
2) could you please explain where did you find the connectors where the modules goes in and how did you make it capable of using dual channel mods?

Edit: Just noticed that I already posted here ->
http://mtsforum.grailtone.com/viewtopic.php?t=20898


Last edited by JackTheLad on Tue Jul 05, 2016 4:00 pm; edited 1 time in total
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Mattfig
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Joined: 22 Jun 2010
Posts: 5525
Location: Hurtling through space on a wet rock.

PostPosted: Tue Jun 28, 2016 7:26 am    Post subject: Reply with quote

Holy s*&t is that cool! Great work Emperor!
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JKD
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Joined: 03 Apr 2007
Posts: 4669
Location: NorCal

PostPosted: Tue Jun 28, 2016 12:42 pm    Post subject: Reply with quote

WOW is all I got...great work!
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CrazyNutz
RM50


Joined: 02 Aug 2016
Posts: 97
Location: Texas

PostPosted: Wed Aug 03, 2016 12:26 am    Post subject: Reply with quote

Rad. Great work
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djdayson
RM100


Joined: 14 Mar 2007
Posts: 349

PostPosted: Thu Sep 22, 2016 1:03 pm    Post subject: Reply with quote

Awesome, nice DIV job!

What did you use for your card slots? We found surplus crap at a local junk store and cut up project boxes as supports, though yours are beautiful LOL!

Here's our DIY 50W RM2 featuring two MTS preamps (currently single-channel), a 50W Class A solid state power amp, a Two Notes Torpedo CAB providing tube power amp sims (replacing a loaded 1/4 W 12AU7 power amp), room sim/reverb, cabs sims and EQ (plus the Axe FX Ultra for FX and mixing/switching of the preamps).

The RM2 also features the RM20/22's pre tube boost stage.



Last edited by djdayson on Thu Sep 22, 2016 1:46 pm; edited 1 time in total
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withmittens
Lynch Box


Joined: 13 May 2012
Posts: 921
Location: Beacon, NY

PostPosted: Thu Sep 22, 2016 1:26 pm    Post subject: Reply with quote

Hey! The E2 finally came out through the back door.
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djdayson
RM100


Joined: 14 Mar 2007
Posts: 349

PostPosted: Thu Sep 22, 2016 1:37 pm    Post subject: Reply with quote

Are they shipping?

withmittens wrote:
Hey! The E2 finally came out through the back door.
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withmittens
Lynch Box


Joined: 13 May 2012
Posts: 921
Location: Beacon, NY

PostPosted: Thu Sep 22, 2016 1:41 pm    Post subject: Reply with quote

djdayson wrote:
Are they shipping?

withmittens wrote:
Hey! The E2 finally came out through the back door.


I Bet Emperor-TK could beat Synergy to market Laughing Laughing Laughing
_________________
RM50, RM4+RT2/50
CrazyNuts' Dirty Sanchez, Salvation: C-Watt, 50R, DuoPlex, Selma, Supra, custom Twinface
Various cabs
SG, LP Std., Strat
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ramalhais
RM20


Joined: 22 Nov 2016
Posts: 11
Location: Caparica, Portugal

PostPosted: Thu Nov 24, 2016 4:40 pm    Post subject: Re: New DIY modular bass amp Reply with quote

Emperor-TK wrote:
I'm approaching the finish of my DIY modular bass amp and I thought that some here might be interested in the project (if not here, then where else? Wink )

At first, I was just going to use an RM4 with a big solid state power amp, but I really wanted a couple of features that rig couldn't provide. That combo was too big, actually being wider than my 18" wide bass cabinet. Also, I would never need four modules for bass, but I wanted to use dual channel modules. This led me to whip up the following amp.

The amp uses a pretty typical RM4 type front end with a few minor changes. I don't really care for the switching on my MOD50, with a switch for each channel. Instead, I wanted A/B switches, one for the module, and one for the channel. Now I can use only a dual footswitch to control a double module dual channel amp. I don't need midi on the amp, so I went with basic relay switching for the logic signals to the modules. The relays are controlled by a programmable logic chip using momentary switches to change states. This way I could have redundant switches on the front of the amp and on a foot pedal like the original.

For the power amp, I went with a 500W ICEpower/Bang and Olufsen Class D amp that has been showing up in a bunch of commercial products these days. I used the 200W version in another build, and I'm pretty happy with the performance.

There's still a couple things left to do. I need to upgrade my 12V transformer because I ran out of juice (hence the lack of tubes in module 2). I have one on order that has roughly the same footprint. I also want to add a DI out and a built in tuner. The three LED holes on the front are for the tuner, and I have a relay installed to switch the input signal between the tuner and amp. I hacked up an old Sabine and it works, but the clock is injecting digital noise into the circuit that I need to suss out. I removed it from the amp in the mean time.

Anyway, I used it at rehearsal last night, but the Vox module doesn't have quite enough low end for me. Bass-centric modules are next on my list, starting with the Fender Dual-Showman/Alembic F2B circuit that I used in my last build. That sucker has a nice fat low end.

For years I used a '73 Marshall as my bass amp, sometimes with an extra Ampeg V4B to round out the bottom. I plan on doing some bass modules for myself based on guitar amps, but with blend knobs to blend in the clean sound for deeper lows. However, the one thing that everyone gets wrong with blend knobs on bass overdrives IMHO is that they blend in the full frequency clean sound. This never sounds good to me. It's a clean sound disconnected from an unrelated over-driven sound. I'm going to do a low pass clean sound for the blend so that the clean just fattens up the overdrive a bit without adding any real timbre to it.


That's excellent work! I've always wanted to do a DIY modular preamp, but didn't have preserverance Razz
Roughly, how long did it took from the initial idea to the finished work?
Congratulations!
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lightwoheat
RM20


Joined: 22 Jun 2006
Posts: 44
Location: Melbourne, FL

PostPosted: Thu Apr 20, 2017 3:39 pm    Post subject: Reply with quote

Emperor-TK, Nice work!
Did you have to custom make the PCB slot holder or where you able to buy the metal pre-made and add the plastic pcb slot to it?

FM
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