Biamp 1682 Mixer Channel Strip Upgrade
Channel: Jeff Laber
Date: 2018-08-17

Step 1 in hot-rodding Biamp a Biamp 1682 channel strip. Electrolytic coupling caps were replaced, then the tone control caps were upgraded with vintage Sprague film/foil caps on the bass control, Mallory polystyrene on mids and a Philips "mustard" cap on treble. One .1 uF coupling cap was also swapped with a Sprague, and the power supply bypasses were the only value modified from .1 uF crap to 10 uF electrolytic. Original values were otherwise maintained.

The treble pot was 500K for some absurd reason, making it impossible to adjust, with all the adjustment range within the first and last 5% of the shaft rotation. I swapped it with a 25K pot from a send buss for proper control.

The input is connected directly to the EQ section, bypassing the preamp, which will be