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General Discussions => The Lab => Topic started by: EmRR on July 07, 2008, 03:09:22 AM

Title: Altec and Langevin high-pass/ low-pass filter sets
Post by: EmRR on July 07, 2008, 03:09:22 AM
Gee, can ya tell I just got around to uploading a bunch of pics this week?  

Rack mounted Altec and Langevin high-pass/ low-pass filter sets.  Raytheon knobs.  Panel had some other wierdo Daven's on it originally, and the Altec set in the middle was ideal for mounting some Gates Radio console refuse iron that could hold the 'L' bar with connectors.    I'm debating revisiting this with switching to put each pair in parallel as well as series, for notch filter capabilities.  Meant for 600 ohm in and out; load switch puts 680 ohms on the output and (think I recall) 390 ohms in series on the input.  These have lived on the input of parallel path compressors a good bit, to band-limit the 'fun'.  Easy to make a full range tube limiter do the Dept. Of Commerce telephone limiter thing too.  Creative use of Y-cables will also give you crossover type action.  




(http://farm4.static.flickr.com/3171/2627886047_070e7dd690_o.jpg)

(http://farm4.static.flickr.com/3143/2628703916_cc01bcaed8_o.jpg)

(http://farm4.static.flickr.com/3134/2628703466_c2ef7399e2_o.jpg)
Title: Altec and Langevin high-pass/ low-pass filter sets
Post by: EmRR on July 23, 2008, 02:45:14 PM
Link to response plots of one of the Langevin filters:

http://farm4.static.flickr.com/3059/2696522132_2161321303_o.png
Title: Altec and Langevin high-pass/ low-pass filter sets
Post by: syn on July 23, 2008, 04:26:19 PM
beautiful, thanks for posting.
Title: Re: Altec and Langevin high-pass/ low-pass filter sets
Post by: EmRR on May 19, 2013, 01:34:47 AM
some more plots, and loading observations:

http://www.groupdiy.com/index.php?topic=52435.0