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In Reply to: Re: Langevin Transformers posted by Doug Eisemann on March 11, 2003 at 19:44:41:
Doug, your amps look like 610a Muzak amps.
See if this is how your 312a is.
opt imp, connect to, (strap)
500ohms, A-D, (B-C)
125ohms, A-D, (A-B,C-D)
2-8ohms, 0-4,
The three windings are,
D-B, 125ohm
C-A, 125ohm
4-0, 4ohm nominal
as of 5-26-47
If you have 101a power transformers,
For 20w power use taps #1 and #5 (as shipped)
For 15w power use taps #2 and #4
Follow Ups:
Hello,Yes indeed, those would be my amps! No wonder they didn't seem to fit the normal 128 layout, although the circuit is pretty close. I had a feeling the 0-4 taps were for 4 ohm nominal, but I didnt want to find out they were not by blowing something up. I wonder how they will sound. They have really nice transformers for Muzak amps, or any amp for that matter. They look very similar to a Western Electric 124
Doug wrote,
They have really nice transformers for Muzak amps, or any amp for that matter. They look very similar to a Western Electric 124
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You could get 30 of those 755c's? and wire the house for stereo :-)
I must say, distributed sound systems have taken a turn for the worse in my opinion. Muzak listeners used to get treated to Altec 755's powered by Langevin amps like mine. Now you walk into a department store and you get some 20 watt Bogen solid state thing powering cheezy 6" Atlas drivers!
Arrgh, what happened to the quality?
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