|
Audio Asylum Thread Printer Get a view of an entire thread on one page |
For Sale Ads |
In Reply to: Langevin Transformers posted by K.T. on March 10, 2003 at 09:58:34:
hi KT:We have close to two dozen of the Langevin audio transformer designs in our archives though this represents just a smaller fraction or sampling of their body of work.
Follow Ups:
On a related note, would you happen to have any documentation for the Langevin 312A output transformer? I have a pair of mystery Langevin amps, that most closely resemble the model 128 using a 6sJ7-6v6- PP 6l6 configuration with the common 317A output transformer. However, my amps appear earlier, with a slightly different chassis layout, and the 312A transformer. I can't seem to figure out if it has capabilities for 8-16 ohm operation, as strapping info for 500 and 125 ohms is given only.
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
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
--------
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?
Hi Doug: we don't have the 312 engineering folder. Sorry.
Doug--Many years ago in Ca. was given a Langevin amp that I think had 6L6 outputs and output imp of 125-500 ohms. Its output imp was measured and was quite low --enough to work well with 15 ohm JBL speaker system. I was told it was designed to be used in the premium music remote feed telephone lines of the time. Good luck. Max
This post is made possible by the generous support of people like you and our sponsors: