Acme Revival is an independent repair network that operates separately from the manufacturers whose devices we service. Our independence enables a repair model that exists beyond manufacturer-controlled strategies, while preserving the ability to work with manufacturers where appropriate.
Dorrough Electronics is a small U.S. professional electronics manufacturer best known for precision audio loudness and level-monitoring equipment used in broadcasting, recording studios, film/motion-picture production, and other professional audio environments. The company's signature technology is the Dorrough Loudness Meter, which simultaneously displays average program level and instantaneous peak information, providing engineers with a visual representation of both perceived loudness and transient peaks. Dorrough's product history also includes multiband audio processors, analog and digital loudness meters, video level/monitoring equipment, and related broadcast monitoring hardware. Its level-meter technology became particularly influential in professional broadcasting and recording, with Michael Dorrough receiving industry recognition for his work on multiband processing and the compound level meter. ProMusic
Aging rectifiers, voltage regulators, pass transistors, filter capacitors, and related power-supply components can fail, producing a dead unit, unstable supply rails, excessive drift, overheating, or a burnt smell. DAP 310 and DAP 610 units are particularly associated with power-supply restoration work.
Older Dorrough processors can develop shorted or physically ruptured tantalum capacitors on their internal supply rails. These failures may pull down a voltage rail, prevent individual processing cards from operating, or cause complete loss of operation.
Individual LEDs or portions of the characteristic Dorrough bargraph display can become dim, intermittent, or completely inoperative with age. Faults may originate in the LEDs themselves or in the associated dot/bar driver and display circuitry.
Incandescent scale-illumination lamps used in models such as the 280-D commonly burn out after extended service. The meter may continue measuring correctly while its scale becomes partially or completely unilluminated.
Transistors, op-amps, or associated components in the output amplifier can fail and cause missing output, severe distortion, abnormal level, or loss of one signal path. Some failures can cascade through multiple devices in the output stage.
Inductors/chokes in the line-output amplifier can fail with age or electrical stress. This can result in impaired or missing audio output even when the processing and metering sections remain operational.
The FETs used in DAP 310 processing cards can deteriorate, fail, or be replaced with unsuitable substitutes, causing incorrect compression, nonlinear operation, distortion, or poor channel tracking. Correct replacement devices are increasingly difficult to source and normally require realignment.
Internal calibration and adjustment potentiometers can become oxidized, intermittent, or unstable after decades of service. Symptoms include drifting calibration, inconsistent processing levels, erratic meter readings, and inability to maintain proper alignment.
Mechanical switches and related controls can develop oxidized or worn contacts, resulting in intermittent modes, unreliable functions, or channels that appear to cut in and out. Older DAP processors may require replacement of multiple switches during a comprehensive restoration.
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Payable to ACME REVIVAL INC, write Dorrough Electronics in memo line, and mail your check to: 191 University Blvd. Suite 340, Denver, CO 80206. Payment are collected every weekday excluding federal holidays.
