View Full Version : Altec Lansing 1650 equalizer problem

07-05-2018, 12:40 AM
I find old Altec Lansing 1650 Equalizer. There have been several changes over time.
The equalizer works but sometimes totally random made a very loud "boom", exactly like a shotgun fire.
I can not use in this way, the boom effectively scares the audience.
What to do ? Where can I find a schematic ? Have anyone else the same problem?

Earl K
07-05-2018, 04:58 AM
Here's the 1650 Schematic . (https://greatplainsaudio.com/wp-content/uploads/2017/07/1650-01.pdf)

From; GPA's Library (https://greatplainsaudio.com/altec-lansing-library/altec-lansing-equalizers/)

Electronics of that vintage should have all the power supply capacitors replaced.


07-05-2018, 08:04 AM
Thank you very much.