Auditronics

[zzzzz]

Probably some dupes in here but I was able to get copies of some (but not all) docs from my friend's 501 "Son of Grand" console. We are working out possibly making new cards and/or cloning some stuff for DIY projects.

Attached are the most useful docs he sent. Excuse some of the weird labeling.

 

[zzzzz]

new high resolution scans of 110A (Grandson) input modules (original version, "IME" with inductor EQs and "IM" without), respective pinouts, A-30 line amp, and power supply.

edit: A-30 line amp schem here is the original version using LM318 as the IC. The updated NE5534 version is earlier in the thread here.

(looking for 110C and 110D schematics if anyone has them)

 

[zzzzz]

input module LM709 LM301 and LM318 to 5534 retrofit / substitution guide (Auditronics Bulletin # 84A29004)

 

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Grandson 110 Control Room Module, new high resolution scan

 

[MidnightArrakis]

We are working out possibly making new cards and/or cloning some stuff for DIY projects.

I have "Reverse-Engineered" the PCB's for an ALLISON Research "Gain-Brain" comp/limiter, all of the PCB's inside an original 1974 API mixing console, a control PCB for a U.S. fighter jet and I am currently (as in "right now"!!!) working on doing the "Reverse-Engineering" of a Soundcraft 200B sheet-metal channel-strip and its PCB!!! Should you wish to have some assistance in "possibly making new cards" for your projects, I can help. However, the various people and companies that have requested my "Reverse-Engineering" assistance were also able to physically mail/ship to me their existing PCB's, so I am able to accurately obtain all of the electrical and mechanical information that I need in order to correctly re-create these designs properly. If you can do THAT.....then, I can help you out!!!

-- Soundcraft 200B Channel-Strip currently "in-progress" right now:


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[zzzzz]

searchable pdf -- mostly complete service manual for Auditronics 110 (8 Bus) Grandson console scanned by Bob Joneson. Presumably early to mid 70s original version -- all ICs are LM301 and LM709 instead of NE5534. Missing some pages which can be supplemented above.

 

[zzzzz]

Auditronics 110A Grandson 4-bus user/service manual and additional docs, also provided by Bob Joneson. Might be missing a few things but can be supplemented with other Grandson 110 service manuals + docs.

Block diagram also attached (resolution isn't great but it's good enough to understand)

edit 2024-10-29: updated attached file with a significantly more complete & consolidated version with 277 total pages.

The attached version is "compressed" so here is a link to a higher resolution version (40MB) of the same document.

 

[RCAguy]

Auditronics 110 Grandson 4 bus service manual and additional docs, also scanned by Bob Joneson. Might be missing a few things but can be supplemented with other Grandson 110 service manuals + docs.

I have a 110-4 with 8 input strips and all ICs retrofitted with compensated 5534s - reduced noise by 12dB and distortion by 20dB+.

 

[zzzzz]

I have a 110-4 with 8 input strips and all ICs retrofitted with compensated 5534s - reduced noise by 12dB and distortion by 20dB+.

That's correct. Factory procedure here: https://groupdiy.com/threads/auditronics.51783/post-1151003

I have been recapping and repairing 110A channel strips for a studio I work out of sometimes and I've been fitting them with new TI OPA1677 opamps with big improvements in all departments.

Attached (relevant to tech docs) are the notes and info for turning the old LM301 and LM709 modules. Just don't forget to add correct compensation cap if using NE5534s. AND different Zobel network and input scheme if you have Jensen ITs versus the old unmarked can ones.

 

[zzzzz]

Auditronics Grandson 110 console "TO" Test Oscillator module schematics and service docs.

Includes all three revisions of the "TO" module and factory bulletin on modifying one of the revisions.

 

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VU meter amp schematics for 700 series console (various options) and earlier 110.

The 110 scheme was used for the earliest Grandson 110 consoles with Modutec/Beede meters and also (in a different configuration/board layout) for the later Weston meters.

 

[zzzzz]

later 1970s Grandson service manual addendums with schematics for later revision modules (110C, 110D, etc.), rear panel Molex I/O pinouts, and other harder to find stuff.

Contains rare schematics for the previously missing / incomplete:

• later revision 110B IM and IME input module complete schematics (Jensen 6110K xformer with NE5534 ICs)
  
  
• 110C transformerless input module (versions with and without IC EQ)
  
  
• 110D transformer input module (only the non-EQ preamp-only version -- still missing the 110D IME EQ schematic)
  
  
• A-2W power amplifier module
  
  
• A-41 "output amp" (line driver?) module
  
  
• 110C echo return (transformerless)
  
  
• MA-2 later model VU meter buffer (the same one for these boards I made)
  
  
• "F" series fader (P&G) hookup info
  
  
• later revisions of the 110A-CRM control room module, 110A-HPC headphone amp, A-30 output amp card, 110-SIM-1-C (stereo line amp), among other stuff...