NEVE 1783/2 - What would you do with this? Dual Pre-amp Stereo Width Unit

[velo]

[EDIT]

1766 (and 1783) Stereo Width Controls

"These handy little units were the 5.25" high and two modules width
(3.6"). They were generally installed in broadcast consoles and, as the
name implies, were able to change a stereo image from mono to normal stereo to spread which produced an image much wider, equivalent to the addition of 6dB of difference signal. A similar system is used on boom boxes today to improve the separation effect of the speakers. I’ve often wondered why these units were so little used (phasing problems?) but a version was repackaged into a 35 series case for use in a much later broadcast console."

https://groups.google.com/g/rec.audio.pro/c/xIbvI_k17dY?pli=1

We called them and contemporary Neve didn't know these existed?

Would this be a two-channel summing mixer? Mono/Stereo + Pan knobs have the wheels in my head turning.

Two of everything.

(2) Marinair (Radar) LI 31267/S T1442 input transformers
(2) Neve B340 op-amps
(2) Neve Marinair LO2567 output transformers

 

[MagnetoSound]

Looks like a Stereo Width Unit. Nice thing to have.

 

[ubxf]

I don't know if it's any help but may be worth reading
https://gearspace.com/board/geekzon...8-stereo-width-module-into-summing-mixer.html

 

[velo]

Looks like a Stereo Width Unit. Nice thing to have.

Aye. Finally found some search engine called Google had it with the right mix of keywords. ;-)

 

[velo]

Also found it listed here:

https://www.technicalaudio.com/neve/1750-1799.html

 

[velo]

Looks like a Stereo Width Unit. Nice thing to have.

This is my first Neve module. I guess I need this...

 

[noizetoys]

You need a pin out, but chances are that ain’t it. If you can’t find a schematic you need to trace the pins. Good thing is Neve were sticklers for colored wire and wire labels. Makes tracing WAY easier. You can find schematics for BA183/283 and the transformers here in Tech Docs. Than you can add your own to the pile.

You could always reach out to Ian or Blake Devitt. If they don’t have it, it doesn’t matter exist.

 

[velo]

You need a pin out, but chances are that ain’t it. If you can’t find a schematic you need to trace the pins. Good thing is Neve were sticklers for colored wire and wire labels. Makes tracing WAY easier. You can find schematics for BA183/283 and the transformers here in Tech Docs. Than you can add your own to the pile.

You could always reach out to Ian or Blake Devitt. If they don’t have it, it doesn’t matter exist.

I'd assumed Neve 1970s consoles used a common bus so that the pin-outs from one unit schematic would give me a hint of what the bus was expecting in general. I compared the 1073 pin-out to what I was seeing and there appear to be some similarities. Lots of heat shrink tubing makes it hard to trace but...

Two similar ch.1 ch.2:

A - red -- input trans
B
C
D - black -- input trans ?
E - three blue -- 0V reference (?) -- also connected to other channel E, leaving two blue
F
H - (ch.1 blue, ch.2 green) + large cap -- cap wired to output trans
J
K
L
M
N
P
R - red
S
T - black
U - thick red on ch.2 only -- (+24V?)
V - green -- chassis + single ground rail wire (?) (makes sense for avoiding ground loop?)

pin E is "floating" 0V "schematic ground" (?)