Had this thing completely restored and modified. Then the IRS sent new an unexpected bill so sadly it’s gotta go. $8k plus into mods and restoration. More pics coming soon. Here’s the list of work done:


Cleaned existing wiring harness and turret boards. Removed unnecessary wiring and assemblies


New Power Supply

- 10VAC supply replaced with 12VDC supply for LED meter bulbs and VU paging circuit

- 1.5A 48V module to exceed console and phantom power requirements


Direct output circuit designed around Langevin Am457. Replicated PCB layout to maintain snr and sonic characteristics.


Cleaned modules, boards and under transformers.


Original modules recapped and rewired to accept mods


New wire looms from Mogami 2944


Constructed 11 position adjustable input attenuators. 6dB nominal increments.


Direct output boards and transformers mounted on plate in rear of chassis


Passive VU “paging” circuit added


VUs 5 & 6 wired to XLRs for “patchable VU” application - per request


“Backplate” added to rear of chassis for DB25 and XLR I/O as well as power


Replaced rubber parts and rusted screws console wide


Modified reverb send / return circuits on Bus Modules. Gain of return also modified for modern functionality. Added termination resistors and VU trim pots.


Replaced intermittent faders with NOS Duncan faders


Noted out of spec transformers providing lower gain on two modules. Transformers appear to be isolation or “line” transformers. Moved to channels 7 & 8. Direct output circuits tweaked for additional gain on these channels.


All switches flushed and Stabilant 22a added to all panel connectors


VUs calibrated to +12dBu


72hr burn in

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Listed5 months ago
ConditionExcellent (Used)
Excellent items are almost entirely free from blemishes and other visual defects and have been played or used with the utmost care.Learn more
Brand
Model
  • AM-4
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Orangepopsongs

Hamilton, VA, United States
Sales:168
Joined Reverb:2016

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