Whistle Rock Audio - Store is CLOSED
- Thread starter mikefatom
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Help Support GroupDIY Audio Forum:
mikefatom
Well-known member
Hello everyone,
I finally got a chance to put some new stuff up of the site these past few days...
The big news is the ML12 discrete pre! I've been playing around with this one for a while now and I believe that it is ready for the lime light. You can check out all the details on the WRA site HERE.
A build help guide will come soon and full kits will follow if there is enough interest.
Cheers,
Mike
Thanks to Jeff @ CAPI for hooking me up with the great Bourns pots for this project.
I finally got a chance to put some new stuff up of the site these past few days...
The big news is the ML12 discrete pre! I've been playing around with this one for a while now and I believe that it is ready for the lime light. You can check out all the details on the WRA site HERE.
A build help guide will come soon and full kits will follow if there is enough interest.
Cheers,
Mike
Thanks to Jeff @ CAPI for hooking me up with the great Bourns pots for this project.
deuc224
Well-known member
Are these like the run u did a while back (red boards)?
mikefatom
Well-known member
deuc224 said:
Hey Deuc224,
I never offered anything like this before. At least not officially on the forum.
You must be thinking of mitsos' 312 boards.
Cheers,
Mike
deuc224
Well-known member
DOH! sorrymikefatom said:
buildafriend
Well-known member
Will your 2520 Op-Amp kits drop right into the Access 312 PCB's? I tried looking at pictures but I can't view the names on any and all the schematic says is "2520 Op-Amp." I can send you a photo of the access 312 PCB's if needed. Here are some pictures of populated ones, but like I said I can't read the names of the amps.
http://twin-x.com/groupdiy/thumbnails.php?album=262
Will your PSU kit work for them too? I don't see anywhere what the amount of voltage is for these. ( sorry im a newb )
http://twin-x.com/groupdiy/thumbnails.php?album=262
Will your PSU kit work for them too? I don't see anywhere what the amount of voltage is for these. ( sorry im a newb )
mikefatom
Well-known member
buildafriend said:
Hello buildafriend,
Yes, both the ML2520 and ML918 are compatible with the Access 312.
The ML12 PSU kit will also work for this project. If you decide to go with my PSU, you can order the default configuration (+/-16V, +12V and 48V) which will work perfectly with both the ML2520 and the ML918.
Cheers,
Mike
3nity
Well-known member
with the access-312 dont need any 12V.
good luck.
good luck.
mikefatom said:
Thanks, Mike. That answers one question I had before I searched here. Good to know the 918 works on 16V. I've read schematics saying 18V or even 20V as well.
What makes more difference in the forward sound of the 312? Trannies or the 2520? What does it take to drop a 918 into the ML12 circuit -- will it work as built?
Just so you know, I'm the cat who got the "pre release" ML12 boards and built up a couple channels two weeks ago. They went together far too easily, as did your power supply. Nicely designed and beefy. Just waiting on a faceplate to pretty it all up, as I just slapped them in a cheapo rack case from Circuit Specialists.
My only issue now is that I can't decide whether to do two more channels as straight up 312 or experiment with trannies and/or the 918 to get a somewhat more balanced sound.
mikefatom
Well-known member
Moose said:
Hey Moose,
Glad to hear from you here. Yes, the ML918 will run on+/-16V just fine and even +/-24V with a mod.
I'd say that the input transformer has the potential of making the biggest difference. Then comes the output tranny and then the DOA.
The ML918 is a drop in substitute for the ML2520 in the ML12 pre. That is the case in likely 99% of cases.
Experimentation is the fun part of building projects like these!
You should post some pics when you get it all fixed up...
Cheers,
Mike
buildafriend
Well-known member
mikefatom
Well-known member
No, don't use them in a 312 build to drive a transformer. Get a proper DOA instead.
Cheers,
Mike
Cheers,
Mike
okgb
Well-known member
Cool ! I'd think a two doa config this would be good for the first one
, try any I.C. you like
, try any I.C. you like
3nity
Well-known member
i have drive an comq-2s using Ne5534.
Thnaks
Thnaks
mikefatom said:Experimentation is the fun part of building projects like these!
You should post some pics when you get it all fixed up...
Cheers,
Mike
Frankly, there's no reason NOT to experiment with something like this. For all the effort, you might as well learn something while you're at it. I have ideas.
As for pics, I haven't gotten it pretty at all. Life has been getting in the way of my hobbies. Hate when that happens.
I still haven't gotten my faceplate and I'm on hold until then. Got a channel up and it sounds great, but it isn't in show-off mode. I do have a couple of pics I took while I was sorting the chassis:
Power supply:
Testfitting the boards:
A completed board:
All your stuff has been great. The boards go together really quickly. The op amps take a steady hand, but they're a great little kit for someone good with an iron.
The only thing I've been unhappy with in this project, actually, has been the case. I expected it, though, considering the price. It was the $35 economy case from Circuit Specialists.
I'll be back to you next week to get some DI setups, for sure. Probably boards, too, as I'll be filling those two empty spots when I have the transformer budget. Thanks for making it so easy.
mikefatom
Well-known member
Hey Moose,
This looks great! I can't wait to see the finished product!
Which knobs and switch caps are you planning on using?
Cheers,
Mike
This looks great! I can't wait to see the finished product!
Which knobs and switch caps are you planning on using?
Cheers,
Mike
mikefatom said:
I got the standard API looking switch caps -- the conehead ones from C&K. Mouser part numbers 611-F01xx. Got 'em in black, white, and grey at Mouser. (F0101, F0102, F0103, respectively). They don't have the F0104 in which are the red ones.
Your switch spacing is too tight for the barrel buttons -- F02xx series. I liked those, but like the narrow board size even better.
I've got the vintage style knobs from classic API on hand, and I also have some mouser knobs that are not quite as cool, but of a similar vein. part number MKPG40B1/8. I'll use one or the other. It REALLY shouldn't matter as this is just going to be a cheap plastic faceplate over a cheap crappy rack chassis, but I somehow can't decide which knobs I like until they're on the thing I built. As a result, I collect amplifier and pedal knobs like women collect shoes...
mikefatom
Well-known member
Moose said:
That's what I figured one would use in a build like this.
Moose said:
Guilty as well.... :-[
Anyway, keep us updated!
Cheers,
Mike
mikefatom
Well-known member
mrcase said:hey mike!
finished one ML918 and tested it on a vocal rec with my api 312! sounding absolutely wonderful! nice balanced and smooth sound and quite different to my 2520s!
thanks again!
Glad you like it!
Cheers,
Mike
