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Old 04-15-2002, 08:58 AM
pnoise pnoise is offline
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Location: New York, NY USA
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Default How to wire up an LA-3A?

I know this isn't exactly a Digi topic...but I figured some of you might be using these (or maybe had in the past). I just assumed that you all would be a better resource than the PTLE or Genereal forums.

I have an Urei/Teletronix LA-3A Leveling Amplifier sitting around the studio that I would like to make use of. However, I am not sure of how to connect the wires. The back does not have input or output connectors, but wrap-around/screw-in contacts. Starting from the top and going down here is how they are labeled. (o = screw contact point)

o +/-
IN
o Com.

o Chassis

o Stereo

o Com.
OUT
o +/-

I know this is basic wiring and I could probably pull a trial and error test, but I don't want to mess this unit up, as it is my boss's, not mine.

In addition, there are two other screw/type adjustments on the back:

1) Stereo adjustment - the label mentions turning the screw colockwise for "MONO."

2) HF Contour - turn screw clockwise for "FLAT"

What would be the optimal settings on these?

Thanks for any help you can give.

Steve
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Old 04-15-2002, 12:10 PM
stoneinapond stoneinapond is offline
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Default Re: How to wire up an LA-3A?

Can't help you personally, but if you head over to Recording.org and ask on the producers, engineers, hardware forum, I'm sure you'll get a quick reply.

Hope this helps,

Yorik
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Old 04-16-2002, 01:07 AM
dave-G dave-G is offline
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Join Date: Dec 2000
Location: Florida
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Default Re: How to wire up an LA-3A?

Connecting this thing is relatively simple -- what you're looking at is called a barrier strip. You can simply attach bare wires to it, but you'll be a little slicker if you crimp or solder some decent spades on to the ends of your wires. You should be able to get spade connectors (U-shaped prongs that go under the screws) at Radio Shack, or at your local electronics supply.

+ gets the hot wire (most likely pin 2 if the other end is to be an XLR)

C gets the negative side to pin 3 on your XLR

Com is ground, shared--to pin 1 of your XLR

stereo (if memory serves) allows you to put a jumper from one unit to another to sum their voltage control (by the amount set on the trim-screw you noted) for stereo tracking.

These and the HF settings will likely make themselves evident once you've got this thing set-up so you can hear it. If you have any other questions, you might want to ask your local service-tech, or maybe post something to John Klett's forum on PSW.

-dave-G
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