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Project Specific Discussions => Mixers/Monitoring Systems => Topic started by: TubeMonkey on September 25, 2018, 01:56:18 PM

Title: 1974 API 3224 40ch resto-mod
Post by: TubeMonkey on September 25, 2018, 01:56:18 PM
Hi Guys,

Starting this thread, as is long overdue, to document the rabbit hole I've been slowly been going down over the last year and a half. This is meant as archival documentation for myself, as well as a bit of show and tell while I get this thing back to 100%.  I have been taking lots of pics but have been slow to put it up online....

I happened to into this frame about 2 years ago here in Nashville, it was sitting on the other side of the river in an old dilapidated movie theater converted into a warehouse/storage facility with a lot of audio junk including a Neve VR frame that had been in a fire.  There were 3 EMT 140's over there but I'm not sure what happened to those... Anyway I think somewhere deep inside i knew how big of a project this would be but I couldn't let the opportunity pass and knew that I was capable of doing the work.....  So I rented a Uhaul and went and picked it up with a couple of friends. 

I'm trying to find out some of the history on the board, the broad scope of which is pretty straight forward. Leon Russell had commissioned and owned the board for most of it's life, until it was sold to another owner here in Nashville about 6 years ago when the decision was made to sell off the eq's and preamps. 

The 3224 was an ambitious and short-lived design... true to "Automated Process" this was really the first attempt at an SSL-style fully recallable automated board.  Most parts of the board had VCA automation integrated, including a VCA limiter on each preamp card, Group functionality, Gates, Echo sends, Quad buss sends, and an optional automated version of the 554 eq called the 954....    Incredible technology for the time, but the implementation hadn't quite caught up. I've heard a few people say the only time these things truly worked to full capacity was the day they left the factory....  I haven't met or talked to anyone who can tell me how all that automation sounded.

I don't have the original bill of sale... but I did a bit of talking with Terry Palmer, who used to work for Leon, and he mentioned that Leon had custom ordered it as a 40 frame (they only made a 32 frame at the time) and had the chassis made out of a magnesium alloy to cut down on weight as the original intension was for this desk to go on a recording truck (which it later did).  With all the bell's and whistles and the custom specs the board came close to $400k...

Leon had recently purchased a mansion in Tulsa, and apparently had decided to build a studio in the basement and stick the console there for a few years. This was a private studio setting, in addition to the famous Church studios in Tulsa which had a red Helios.

I have very few pictures of the console from before it's sale from Leon, but i do have one from it's residence here...  Anyone know who this engineer might be?

Anyway Leon had lots of house guests including Tom Petty, Paul and Linda McCartney, George Harrison, Ringo, Eric Clapton... that whole scene... So i've been trying to find the records that would have been done on this console.  I have a running list that I will include in a follow up post.

After Leon sold the mansion it ended up on the Paradise Records mobile truck out in L.A..  I have almost no documentation on this era... I've heard that the truck was a mobile control room of sorts that would be backed into a bay at the studio and plugged in, and then unplugged and driven off to use remotely. 

At some point Leon moved everything out here to Nashville (Hendersonville). I don't think the console was ever installed in his home studio there so I'm unsure if it just sat on the truck or was in storage somewhere.

I'll update with more info soon!

Let me know if you have any info!

EB



Title: Re: 1974 API 3224 40ch resto-mod
Post by: iampoor1 on October 31, 2018, 03:25:14 AM
Fascinating!

Are any original channels left in the frame?
Title: Re: 1974 API 3224 40ch resto-mod
Post by: TubeMonkey on November 07, 2018, 01:48:23 PM
Fascinating!

Are any original channels left in the frame?

All the 550a modules were removed as well as the 912 preamps. Most of the ACA summers were removed as well as most of the 2520's.

Fred Hill took 24 of these and put them into a sidecar which now resides at Public Hi Fi studios in Austin. Not sure where the other 16 channels ended up... probably sold off.  I didn't really have an interest in reviving the automation in this thing, rather turn it into something great and then drop moving faders into it at some point....  so getting these preamps back was never an interest to me. The 900 was a strange card which had 50 pin edge connector (as opposed to the 15 pin 500 series). Many of those pins were for DC group control.  Today these preamp cards would be useful if converted to a 312 circuit, but i have yet to see one with the VCA intact. I'd be interested in finding one for curiosity's sake but don't plan on putting those back in the desk. 

Echo mountain in Asheville has the same model desk, with a slightly different frame, with these preamp modules. They've removed the VCA's and treat the card as a simple preamp.

Here's a pic of the side car at Public Hi Fi
Title: Re: 1974 API 3224 40ch resto-mod
Post by: TubeMonkey on November 07, 2018, 01:54:59 PM
Here's the channel layout for the 3224. The console was different from the 2488's of the time which had the 512/516/518 in that the preamp card and the group card were separate modules.
Title: Re: 1974 API 3224 40ch resto-mod
Post by: TubeMonkey on November 07, 2018, 02:09:03 PM
Here's a pic of the console and side car as they sat when I picked them up:
Title: Re: 1974 API 3224 40ch resto-mod
Post by: TubeMonkey on November 07, 2018, 02:26:47 PM
Luckily the 912 preamp module's face dimensions are the same as a 500 series module, and with the 912's card being about an inch and a half longer as well I decided to design a PCB riser system which would raise the bed of the console to 500 series height and pin-swap the necessary connections....  which effectively has converted the console into a 80 slot lunchbox. 

There was a couple things I liked about the 912 preamps... one was that the console has provisions for two mic tie lines for each channel.  I'm guessing this was for a location scenario where two bands were set up... instead of re-patching between sets one could simply switch from "mic 1" to "mic 2" on each channel. I wanted to keep this for quickly switching vocal mics or switching to an auxiliary drum kit.   The other nice about them was the master-mode mic/line switching which was 24v relay based. 

There was a point where I considered dropping 40 VP28's into the desk but even at a cost of $400ea that would still be $16k just for the preamps, and I couldn't have exactly what I wanted.

I ended up going down a crazy rabbit hole from about February this year until April, where I taught myself PCB design and designed my own preamp based around a 312, with a few cap values and the extra provisions from the 912 all packed into a 500 series module.

I included switches on the riser card to switch between a standard 500 series and my preamp, which has 4 extra pins for 24v relay power and the extra mic input.  If you wish to insert a standard 500 module into the desk you simply flip the switch which kills these extra pins.

My preamp has the 4 extra pins included on the back of the connector. I used a two sided 30 pin connector instead of the single sided 15 pin connector the achieve this. Similarly my module is compatible both in my console with the extra pins and in a standard 500 series rack with the implementation of a jumper that disconnects those 4 pins so there is no danger of damaging that part of the circuit.

pics to follow
Title: Re: 1974 API 3224 40ch resto-mod
Post by: TubeMonkey on November 07, 2018, 02:53:47 PM
Here is an ongoing list of work done/to be completed:

Phase 1:
Power supply prognosis
   - boot power supply and sus issues

2520's
   - build a sh*tload. (250)

Center section rebuild
   - center section prognosis and rebuild if necessary
   - Build an implement CAPI ACA's to replace removed ACA's, metalwork for console mounting
   -  move group masters to faders/ remove automation panel
   - design and implement metalwork for P&G group master faders
   -  move center section down and relocated cross beam
   - Build and implement Quad compressor into space created by removal of submaster and automation panel
   - Limiter connector rewiring for 500 series compatibility
   - Change quad master from pot to 2x stereo faders. Change Mono master pot to fader

915 group module
   - recap
   - re-implement transformers for direct outs
   - drill pcb for 2520 sockets
   -  mod for quad bus functionality

Replace 940c automated faders
 
    - flip desk and do wire run mod to 40x channels
    - Metalwork to implement P&G faders

Phase 2:
    - Design and implement PCB mother riser
    - Design and implement console preamp
     
Phase 3:
    -  rebuild sidecar/jukebox cabinet to match original
    -  rebuild sidecar modules where necessary

Phase 4:
   - possible custom EQ design
   - New console vernier
   - replace casters with proper legs
   - replace bolster
   
   
Title: Re: 1974 API 3224 40ch resto-mod
Post by: TwentyTrees on November 07, 2018, 05:03:57 PM
Wow! This is brilliant to see, and from the pic above it looks like what you’ve got is in decent condition - far better than I’d have feared given how you came into it! Great idea to convert to 500-series compatibility. I’ll be following your work with great interest.

While I’ve not used them so can’t vouch for the sound vs a Gar2520 or the other usual suspects , the Louder Than Liftoff Rogue Five DOA is 2520 compatible and is comparatively cheap at $19 assembled - might be of interest given the volumes you’re looking at:
https://store.louderthanliftoff.com/products/rogue-five (https://store.louderthanliftoff.com/products/rogue-five)
Title: Re: 1974 API 3224 40ch resto-mod
Post by: boji on November 07, 2018, 06:23:25 PM
Your console reminds me of the Les Paul one on display at API headquarters. Guts I'm sure are different,  but the geometry and those square illuminated bus buttons are the same.

Boy you got your work cut out for ya!  I'm only into about 30 gar 2520's and I'm ready to retire. =D

Quote
The 900 was a strange card which had 50 pin edge connector
Curious if you could post picts of the 900 card.

I scored a old wheastone console a few years back and in my ignorance decided to use the 50 pin edge connector / backplanes as foundation for my build.  I don't fully regret it, but having split connectors for a two sided sandwiched PCB's would have made routing easier.

Also curious to see your 325 / 500 card! I've got plenty of 500 slots to fill myself.

Nice score on the monitoring section. :)  Ready to bring back quad?

Title: Re: 1974 API 3224 40ch resto-mod
Post by: Walrus on November 07, 2018, 06:53:47 PM
You certainly do have your work cut out!
By the look of it, the psu's are 650A's. The usual problem with them is that the small caps on the pcb dry out and you get hum on the audio. Occasionly the 723regulator IC goes duff, but otherwise they are very reliable.
Title: Re: 1974 API 3224 40ch resto-mod
Post by: TubeMonkey on November 07, 2018, 09:52:54 PM

While I’ve not used them so can’t vouch for the sound vs a Gar2520 or the other usual suspects , the Louder Than Liftoff Rogue Five DOA is 2520 compatible and is comparatively cheap at $19 assembled

I had looked into it but greatly preferred the sound of the gar2520. I can also get my cost down to $5-$6 if I put in the time.  I've already built 100 so almost halfway there! lol

I've been doing them in sheets of 25/50



Title: Re: 1974 API 3224 40ch resto-mod
Post by: TubeMonkey on November 07, 2018, 09:58:35 PM
Curious if you could post picts of the 900 card.

 Ready to bring back quad?

Here's  a pic of the 900 card sans transformers and amp

I figured i would use the back bus as a parallel mix or something.... but definitely going to find a quad turntable and a copy of Dark Side of the Moon  :D
Title: Re: 1974 API 3224 40ch resto-mod
Post by: TubeMonkey on November 07, 2018, 10:00:35 PM
Here is the back side of the 912
Title: Re: 1974 API 3224 40ch resto-mod
Post by: TubeMonkey on November 07, 2018, 10:09:46 PM
You certainly do have your work cut out!
By the look of it, the psu's are 650A's. The usual problem with them is that the small caps on the pcb dry out and you get hum on the audio. Occasionly the 723regulator IC goes duff, but otherwise they are very reliable.

Good to know!

Yes here's the monster that was powering this thing. There were 15 supplies for this console with 1 spare. Im currently on 10. 5 of them were for automation related power. I sold one to fund some R&D so I have 4 spares which will be good. I also stuck some LED readouts on each one so I can monitor in real time incase one crashes.
Title: Re: 1974 API 3224 40ch resto-mod
Post by: boji on November 08, 2018, 09:55:35 AM
Hey thanks for posting. Ah, 50 pin total. Wow there are some budges in there... Don't feel so bad about my shoddy cad anymore. :)
Title: Re: 1974 API 3224 40ch resto-mod
Post by: TubeMonkey on November 08, 2018, 06:14:56 PM
Here is a link to the thread documenting the quad compressor build which I finished up last December.

https://groupdiy.com/index.php?topic=67629.msg859379#msg859379

The photo album contains some pictures near the end of re-locating the center section to accommodate everything.

https://imgur.com/a/nuiwf



Title: Re: 1974 API 3224 40ch resto-mod
Post by: TubeMonkey on November 11, 2018, 01:16:44 PM
Here's a picture of my current board revision. I ended up having to make one more adjustment on the mounting holes so final revision to come!  One a get the PCB's bulk ordered and the metalwork in I'll be ready to build 40!

Title: Re: 1974 API 3224 40ch resto-mod
Post by: TubeMonkey on November 11, 2018, 01:47:12 PM
Here's a picture of my completed riser card

The switches kill 24v relay power to the module for 500 series compatibility. Since the Mic and Line source on the desk come from two different places it's necessary to select mic or line source for a 500 series module for the riser board.  Three inputs make it to the connector when my module is inserted including Mic 1, Mic 2 and Line input.
Title: Re: 1974 API 3224 40ch resto-mod
Post by: TubeMonkey on November 11, 2018, 01:48:37 PM
Here's a bottom view of the riser card.

Title: Re: 1974 API 3224 40ch resto-mod
Post by: boji on November 11, 2018, 08:11:33 PM
Sexah looking micpre!  Congrats. 

I dig the fisheye caps. Nice choice.
Title: Re: 1974 API 3224 40ch resto-mod
Post by: boji on November 11, 2018, 08:16:01 PM
So I assume the 6 pole means this is a variation on the 1st half of a 528 and not just a micpre?
Title: Re: 1974 API 3224 40ch resto-mod
Post by: TubeMonkey on November 11, 2018, 09:10:30 PM
What's in the first have of the 528? I'm unfamiliar with that module.   My desk split what would be the 528/544 module into two separate modules.... the 912 preamp card, and the 915 group card. If you look at the channel layout I posted early you can see how the functionality is split.

the 915 card contains another opamp and 2623 transformer (except channel 1-16) for direct outs on each channel.
Title: Re: 1974 API 3224 40ch resto-mod
Post by: boji on November 11, 2018, 09:20:22 PM
Quote
If you look at the channel layout I posted early you can see how the functionality is split.
Ah I see. Thanks.

Quote
What's in the first have of the 528?
Mic/line switched 2520 and tx's.
Title: Re: 1974 API 3224 40ch resto-mod
Post by: TubeMonkey on November 11, 2018, 10:36:26 PM
Mic/line switched 2520 and tx's.

That's actually exactly what it is...  Just switching an impedance matching pad in front of the trafo  instead of using two separate ones, switching physical source for "desk preamp" Mode and switching  pad in for line mode in "500 series" Mode. I designed them in a way which lets them be compatible in my desk or in a 500 series lunchbox, as well as the console slots being compatible with my preamp or any 500 series module.  Most of that is taken care of with the relay's in desk mode.... but there isn't relay power in 500 series mode so it has to be physical switching. I also didn't see a point in having  two separate 2520's driving the channel as they serve the same purpose, but still wanted a separate mic/line control, so the switching actually changes the negative feedback part of the circuit from a stepped pot for mic to a potentiometer for line mode.  this also means the settings between mic mode and line mode are independently preserved while saving from having to use 2* 2520's per channel.
Title: Re: 1974 API 3224 40ch resto-mod
Post by: boji on November 12, 2018, 10:49:57 AM
"switching actually changes the negative feedback part of the circuit from a stepped pot for mic to a potentiometer for line mode."
interesting! Sounds like you've given the whole thing plenty of thought and functionality.   In my first bucket (which will be the end bucket once finished), I kept it line-in only but stayed true to the skiz mostly, and plan to use the daw for prefade gain, or 500 slots ahead of input card.
Title: Re: 1974 API 3224 40ch resto-mod
Post by: TubeMonkey on November 15, 2018, 03:16:01 PM
Getting into some metalwork the past few days. Finishing up the L-bracket design and looking for prototyping options. The previous 4 preamps I had hand-drilled which was cumbersome and imperfect....

Also rebuilding the mounts for the ACA's in the back of the console. There are 19 total ACA's/booster cards. I currently have around 10 running. Still need to build one for each pair of buses, as well as a few center section functions such as delay sends. Other than that the center section is 95% operational.

Here is a before pic of one side of the console with 4 ACA's installed. I've built and and am installing a stacking system with metal brackets to make everything look nice and for cable management.
Title: Re: 1974 API 3224 40ch resto-mod
Post by: boji on November 20, 2018, 10:10:52 PM
Quite a bit of iron you got there!  Yes, send a pict of the stack.  I think I may take the same route in a U5 or U6 rack.
Title: Re: 1974 API 3224 40ch resto-mod
Post by: TubeMonkey on February 05, 2019, 01:10:55 AM
Alright... really bad at updates but i've been working a lot on other projects as well as the console.  I received the final version of my PCB which passed all tests with flying colors and have already been building them.  The only missing element is the metalwork which I'm working on ordering soon, but having a little difficulty finding someone to do a prototype before I put in the large order....

Also need to source knobs.... I really like the large vintage API knobs but obviously going to have difficulty getting them. I most likely will just send them to my CNC guy and get a pack of 50 or 100 ordered from him.

I took the dive and flipped the console up to do the fader mod... which involved running audio out to the fader bay. I got that work done in about 6 hours over two days... LOTS of delicate wire to sift through and tie back for each channel to ensure I didn't burn through any of it with my iron which would have been a nightmare...    Flipped it back up and have two ongoing issues... one is a bus jumper has become disconnected where they are jumpered between cards...  easy to find and easy fix but it's up under the console so I need to come up with a plan to get in at the awkward angle to fix it.  Also the solo functionality of the input channels isn't working now but that might not be related to flipping the console.  Solo functionality still working on the center section cues and sidecar... but they might be different busses electrically. 

I ended up getting extremely lucky and found an 8 pack of faders on ebay with the correct size faceplate and escutcheon...  and all the correct P&G faders with correct value. Turns out he had 48 total which was perfect for me and I bought them all for WAY less than I was prepared to spend on getting new fader faceplates made/outfitting with mix and patch P&G's.  Got them all dropped in and am working on wiring them all up!

Not sure what to do with the old faders.... might make a coffee table out of them?  ;D
I'm still going to get a single piece of metal made and screen printed for the 16 bus master faders.

I'm 6 preamps deep...   definitely going to be snowballing on that front soon....  cost of a large order of transformers is really the only thing holding me back at this point.

As far as EQ's go I've sourced 4 554's, a 550b, and a datatronix 550a so far... Still would like to design my own EQ but at this point just focusing on getting 8 channels going and filling out the preamps.

also not pictured are the four 525's to the right of the center section.  I converted the console's old pinout to the 500 VPN standard so I can throw whatever I want in there... and obviously converted the 525's to 500 series so they can go anywhere as well.

Coming up: Massive preamp build. Also I'm out of 2520's so I need to do another batch. This time instead of doing 2 5x5 sheets I'm going for the mind numbing 11x11 sheet....    hopefully I'll come out of the other side of that with my sanity.  :o

Also maybe night need to start scoping out some spaces around town. As this becomes more usable it's killing me to not be able to use it fully.

AnywayHere's a "State of the Console" pic.  Still lots to do!
Title: Re: 1974 API 3224 40ch resto-mod
Post by: mjrippe on February 05, 2019, 11:58:02 AM
Member avdo was selling API style knobs a while back...
Title: Re: 1974 API 3224 40ch resto-mod
Post by: TubeMonkey on June 04, 2019, 04:33:38 PM
Alright friends, time for the Quarterly update!

I've been working a lot in the studio and traveling which has been nice, but only recently dug deeper into the console. About a month ago I was able to figure out DL tape pinouts and which DL connected to the outboard gear patch points.  I had to beep everything out with a multi-meter because for some reason everything after the first 16 tie points weren't in any logical order. 

I ended up re-pinning the female side so that it was in order and matching the other pinouts of the Mic in/tape in/out DL connectors. These were the large 156 point ITT Cannon DL's which were pretty expensive to get ahold of.  I try not to dwell too much on the fact that the original console cables are probably in a dumpster somewhere.... 

I think at this point I've put about 40 hours into cabling, but now have everything up and running.

I also got to re-labeling my patch bay with color-coded labels which are MUCH easier to see from a distance than the old labeling (green red and yellow cellophane tape).

I finished up building a new mounting system for the ACA's in the back of the console and have only to build 4 more for 8 more channels of bussing.... Also have to mount up the talkback mic preamp and re-solder/crimp a few of the slate/tone inject lines as the original API summing blocks had more pins... Jeff's units will work but only have 3 pins for each molex connector so I will simply have to join them before the connector.

I've also made some progress on acquiring more EQ's and building some more mic pre/input modules.  All 4 525's are working great. There is one that sounds way more magical than the others. I'm going to try and match the internal trim pots of the other three to the one I like most. Also picked up a pair of B&B eq's which are a good utility EQ... jenson output transformers. They don't sound as good as the API's but got the pair for $250 so i'm not complaining!  3 more API 554's in the shop waiting for metal brackets. That will bring me to 6*554's, 2*B&B EQ, 4*525's, 1*Datatronix 550a, 1*550b

Looking for some more EQ options....  I think I'll be going for a pair of CAPI LC40's soon for master bus duties. Also looking at a pair of JLM FREQ500 Eq's  as they seem pretty versatile.  What have you guys been diggin  for 500 series EQ's?

Currently mixing with 16 by patching pro tools -> outboard eqiupment -> console fader in -> Ch. direct out.   Still not utilizing busses 1-8 as I need to fine-tune the gain of the Line amp (currently giving approx. 6db gain boost). (1-16 currently have no ACA).

Was happy to use the Overdub functionality of the mic pre modules on some guitar overdubs on a clients song the last couple of days!

What else? I think the only things really slowing me down at this point are getting the funds for 30 more Preamps and EQ's.
Title: Re: 1974 API 3224 40ch resto-mod
Post by: TubeMonkey on June 04, 2019, 05:02:14 PM
June 2019 console pic!
Title: Re: 1974 API 3224 40ch resto-mod
Post by: TwentyTrees on June 05, 2019, 02:26:01 AM
Great to see the progress you’re making! Always a fascinating read, and your bus compressor looks brilliant in the centre section, really well matched to the rest of the console.

As for EQs, there are obviously lots of great options out there but I wanted to drop in a plug for Chambord Audio’s CA-250,  as it’s flying under the radar slightly  - three bands of Sontec-based full parametric EQ for a very reasonable whack. Sounds great, and super flexible.

https://groupdiy.com/index.php?topic=66011.0  (https://groupdiy.com/index.php?topic=66011.0)
Title: Re: 1974 API 3224 40ch resto-mod
Post by: TubeMonkey on June 05, 2019, 05:17:11 PM
Great to see the progress you’re making!

https://groupdiy.com/index.php?topic=66011.0  (https://groupdiy.com/index.php?topic=66011.0)

Thanks! Yes chopping the center section was a little stressful... but it fits in there nicely! 

The Chambord EQ's look interesting! Do you know if they still offer them in a kit? Trying to keep my EQ cost to <$400 each
Title: Re: 1974 API 3224 40ch resto-mod
Post by: TwentyTrees on June 06, 2019, 08:05:06 AM
The Chambord EQ's look interesting! Do you know if they still offer them in a kit? Trying to keep my EQ cost to <$400 each

Good question - I think Elskardio is only doing complete modules now, but if it’s something you’re interested in then it may be worth asking him the question!
Title: Re: 1974 API 3224 40ch resto-mod
Post by: gar381 on June 09, 2019, 06:27:21 PM
WOW...

Just caught this thread for the first time.
I Love what your doing here.  Much respect ! :)
This looks my kind of fun !! ;)

GARY

Title: Re: 1974 API 3224 40ch resto-mod
Post by: boji on June 21, 2019, 05:28:23 PM
Woah!  She's alive!!!  Missed your update.  Congrats!  I'm jealous how quickly you turned this around.  Hard worker, that TM!

Pictures motivate...so...  moar pix plox!  =D

Title: Re: 1974 API 3224 40ch resto-mod
Post by: TubeMonkey on June 21, 2019, 06:31:39 PM
WOW...

Just caught this thread for the first time.
GARY

Hey Gary,  you have no idea how acquainted I am with the gar2520s. Thanks for all your work with DOA's!

If you haven't noticed EVERYTHING in this desk is 2520's.... I've probably built around 200 at this point.  Last time i was running out and realized I needed to build more I was trying to heckle Jeff into selling me an 11x11 sheet of 121. I wanted to be the only guy to ever assemble an entire sheet of them.... Jeff said they aren't made in the 11x11 sheets anymore so i've been sticking with the 5x5 sheets. It's probably a good thing because I'm not sure how much sanity I would have left after doing a big sheet. haha!

I've been doing 50 at a time lately...
Title: Re: 1974 API 3224 40ch resto-mod
Post by: gar381 on July 10, 2019, 04:43:42 PM
Tube Monkey

Looks :) Goods on your 2520 build!!

When I build Assembled gar2520s for jeff I generally break off my 5x5 cards into 2x5 for assembly.   I tried 5x5 one time
and found it a bit frustrating for me doing the millmax pins.  BTW.. the 11x11 card sitting on my ATR102 is the only one ever
made in that format.  Carry on with your build !  Someday on a visit to Nash I hope you will give me a peek and a listen
to your baby.  ;)

Best

Gary
Title: Re: 1974 API 3224 40ch resto-mod
Post by: TubeMonkey on September 11, 2019, 03:20:45 PM
More updates coming soon! In the meantime here's a cool picture I found of Leon in front of the console in Tulsa sometime between 1974 and 1978. Still trying to track down some more information on the console history!
Title: Re: 1974 API 3224 40ch resto-mod
Post by: boji on September 14, 2019, 01:49:28 AM
Looking good TM! Mind showing us the back of the patch sometime?  I'd like to see how you made sense of it.

Regarding EQ's:
Quote
Also looking at a pair of JLM FREQ500 Eq's  as they seem pretty versatile.

I scooped a pair and I can say with some cursory listening they are nice and broad-sloped.

Incidentally I also got a pair of the Chambord's a few months ago (prebuilt but fair-priced...so many slots to fill, cost is an issue). Both brands are transparent and very quiet but if I had to choose only one I'd go JLM. It has a few more bands to play with and you can't make it sound bad-- even at max settings.  But they are different beasts.  I'll probably end up with JLM's on bus, Chambords on a few channels for its surgical boost/cut Q.

(https://i.imgur.com/C7HrKFQ.jpg?4)
Title: Re: 1974 API 3224 40ch resto-mod
Post by: boji on September 14, 2019, 03:15:59 AM
Quote
I think the only things really slowing me down at this point are getting the funds for 30 more Preamps and EQ's

Totally feel your frustration! Also opa build insanities.  8)  Money and time, time and money....

Are you saving up for pre's that will be different from the channel cards you've already designed?