Whoops

Show us your ADM console modules and info
« on: January 25, 2020, 02:43:21 PM »
Hello,
there seems to be a lot of ADM modules floating around, both Mic channels and EQ modules.
These are highly regarded consoles and circuits, with input and output transformers, their own designed discreet Opamp and inductor based EQ's although there's less info and docs on ADM than other major manufacturers, and some of the info is mostly unreadable.

I would like to invite you all to post pictures and share info of your modules in this thread, and if share your ADM schematics/service docs in the ADM Technical section of this forum:

https://groupdiy.com/index.php?topic=45601.msg767879#msg767879

Here are pictures of the 2 modules I own, one mic channel and one EQ.
They have no model number, the mic preamp has the ADM output Transformer "3-010-5197-0", quite common in ADM units.
There's an a round input transformer, don't know the brand or model it's stamped with this numbers "3-010-5944-0  1006  2787"
And it used the ADM 202 discreet opamp
The EQ module looks similar to the 1554 EQ, although it's DBX based and not Inductor based.
I have no info regarding taht these might be from a broadcast console of the mid to late 80s.

If anyone has info on what these models might be, any schematic or layout please let me know.







Here is the input module without the switches pcb that mounts on top



here is the EQ module





« Last Edit: January 30, 2020, 12:31:53 AM by Whoops »


EmRR

Re: Show us your ADM console modules and info
« Reply #1 on: January 25, 2020, 02:54:00 PM »
That input may be a Microtran.
Best,

Doug Williams
Electromagnetic Radiation Recorders

"I think this can be better. Some kind of control that's intuitive, not complicated like a single knob" - Crusty

"Back when everything sounde

Whoops

Re: Show us your ADM console modules and info
« Reply #2 on: January 25, 2020, 03:51:39 PM »
That input may be a Microtran.

thanks I will search for it. But it could also be UTC made, I've just checked and it's exactly the same size and an UTC 0-12 I have, also the 2 screw holes are in the same place and have the same exact distance.

rackmonkey

Re: Show us your ADM console modules and info
« Reply #3 on: January 25, 2020, 04:24:08 PM »
That ouncer size was very common, with several manufacturers copying the basic original UTC can type. Thordarson, Microtran, Super-electric and Sescom all made versions of it. There were probably others. So the can dimensions won’t tell you much.

The pins would be the best clue, if it has pins.

It could also be from one of the small transformers makers in the midwest that ADM contracted out to often. See the quote from Tom Chrapkiewicz (ex-ADM engineer) in CJ’s post on the black ADM output. The only name he remembered was “SHC”. But it very well could have been from one of those. 

In the end, I don’t think it matters much as UTC O-8s were used so frequently in their modules that chances are good it’s just a similarly spec’ed input from one of their small suppliers. Pure speculation, but I’d put money on it. The schematics for several different units from that era specify an O-8 or “SAW-469”. I’d think that the latter is a copy of the former.   
Whether you think you can or you think you can't, you're probably right.

pvision

Re: Show us your ADM console modules and info
« Reply #4 on: January 25, 2020, 06:00:57 PM »
The knobs look to be the same as those on an Orban 622B EQ

Nick Froome

Brian Roth

Re: Show us your ADM console modules and info New
« Reply #5 on: January 25, 2020, 07:07:47 PM »
Those knobs were manufactured by Rogan in their RB67 series.

https://www.rogancorp.com/plastic-control-knobs

Bri
« Last Edit: January 31, 2020, 07:59:31 PM by Brian Roth »
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TwentyTrees

Re: Show us your ADM console modules and info
« Reply #6 on: January 26, 2020, 05:07:13 AM »
I don't have any schematics unfortunately, but I do have a pair of 1541 active inductor EQs (racked by the chap who was doing them in bulk a while back), purchased second/third-hand here. They're fine EQs, limited in frequency choice but with a nice rock-'n'-roll character (a bit gritty, in a good way). Great on drums, bass, and guitar. They have O-17s as inputs.

I pulled this pic together when working up parts for a recap (and looking into potentially fitting some more modern ICs, though I've not as yet done that). I need to redo the rack-job at some point as it's a bit of a bodge, and the bypass switches don't work well - it seems a bit random whether they'll engage or not, though whether that's the switch or the logic circuit I'm not sure. Might just replace all that with a nice relay bypass.

I've seen some of those 4-band IC-based EQs around on eBay and the like, have you heard yours yet? Would be interested to hear how you find it.

PS - thanks for the link to Rogan, Brian - some of their offerings look verrrrry similar to some old Ward Beck knobs I've been trying to source for a while. Much appreciated.

Whoops

Re: Show us your ADM console modules and info
« Reply #7 on: January 26, 2020, 10:13:10 PM »
In the end, I don’t think it matters much as UTC O-8s were used so frequently in their modules that chances are good it’s just a similarly spec’ed input from one of their small suppliers. Pure speculation, but I’d put money on it. The schematics for several different units from that era specify an O-8 or “SAW-469”. I’d think that the latter is a copy of the former.

It makes total sense.
It doesn't matter that much to me also, could be UTC or any other, more a matter of curiosity than relevance.

I found the model for my Mic input model is M2901, I able to find the same modules online with that number and them I realized that model number was also handwritten in a sticker on the chassis



maybe M2901-6540 as it's written although the same module in a Ebay listing was listed as M2901-110

https://www.ebay.co.uk/itm/ADM-Technology-M2901-110-Discrete-Mic-Preamp-Fair/143494085993?hash=item2168e9fd69:g:YVcAAOSwpoFdhSHQ

https://reverb.com/item/10055903-adm-2901-preamp-1554-eq-1970-s-grey
« Last Edit: January 26, 2020, 10:16:50 PM by Whoops »

Whoops

Re: Show us your ADM console modules and info
« Reply #8 on: January 30, 2020, 12:32:35 AM »
The EQ model seems to be a M1554 module

iampoor1

Re: Show us your ADM console modules and info
« Reply #9 on: January 30, 2020, 10:23:09 PM »
I don't have any schematics unfortunately, but I do have a pair of 1541 active inductor EQs (racked by the chap who was doing them in bulk a while back), purchased second/third-hand here. They're fine EQs, limited in frequency choice but with a nice rock-'n'-roll character (a bit gritty, in a good way). Great on drums, bass, and guitar. They have O-17s as inputs.

I pulled this pic together when working up parts for a recap (and looking into potentially fitting some more modern ICs, though I've not as yet done that). I need to redo the rack-job at some point as it's a bit of a bodge, and the bypass switches don't work well - it seems a bit random whether they'll engage or not, though whether that's the switch or the logic circuit I'm not sure. Might just replace all that with a nice relay bypass.

I've seen some of those 4-band IC-based EQs around on eBay and the like, have you heard yours yet? Would be interested to hear how you find it.

PS - thanks for the link to Rogan, Brian - some of their offerings look verrrrry similar to some old Ward Beck knobs I've been trying to source for a while. Much appreciated.

O-17 is the model number of the shielding can. The transformer is probably a UTC o-8


TwentyTrees

Re: Show us your ADM console modules and info
« Reply #10 on: January 31, 2020, 02:26:16 AM »
O-17 is the model number of the shielding can. The transformer is probably a UTC o-8

Hah! Brilliant. Thanks for clearing that up.


 

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