ATC SCM 100A Studio Monitors - Pair - Black Ash

Pair of ATC SCM 100A professional 3-way active industry-standard studio monitors for sale in black ash. Used in our studio before selling to the current owners who have maintained and upgraded them since.

They are in excellent working order with SL Spec Bass driver & Vifa tweeter upgrades installed.

Commission sale on behalf of the owner.

“No sign of heat on board, in LT area, so probably lightly used.
Recapped all small caps on both boards, Elna caps are absolutely fine. Replace Zener diodes, mounting off the board, and 120R/2.5W droppers, mounting off the board. Replace three-way screw terminals, tired screws.
10k pots were Radiohm, 200k pots were small blue Bourns, with locking solution applied. Opted to replace all pots, as a precaution against possible noise issues, and recalibrate.
Clean PCB thoroughly, and clean off and renew heatsink compound, and brightened up chassis plate, renew earth bonds. Renew signal wiring termination with VDC. Renew signal wiring termination, originally wired pin 3 hot, changed to current pin 2 hot wiring convention. Added new rocker switches, replaited all secondaries. Fuseholders are OK, IECs are OK. 47R assemblies on XLR are OK.
Replaced all M3 screws for caphead, current length with washers. Also, replaced transformer screws, grommets, and larger washers, as per current spec.
Recalibrate, and reset bias, limiters, phase, level.
Check CMRR and opto limiters. Otherwise all behaving well, correct filters and phase alignments. Rebias all channels to run slightly cooler than original, as both were idling at 40 degrees C or so, now down to 29 degrees C approximately.
Appliance test, long soaktest, and retest.
Completed 03/05/19

Rebuilt by Barry, upgraded to SL and tweeter upgrade. Originally no acrylic waste in the lower section, this was just pre SL, and experimentation was going on with the bass driver, etc.
Completed 05/06/19”