Roland TR-808 Rhythm Composer SN 25918

Note: Auction links are affiliate links for which the site may be compensated.

via this Reverb listing

"OG Japanese Roland TR-808, fully converted to US voltage and recently serviced to original Roland factory procedure by Retro Pro Audio, with zero hours usage since service.

As bulletproof an 808 as you will find on Reverb today, with Start/Stop and Tap switches now rated to 50 million key presses.

Full servicing details:

Disassembled, visually inspected interior PCBs and wiring.
Updated PSU: Converted unit from Japanese 100V to US 120V power. Removed existing transformer, replaced with new transformers.
Replaced transformer wiring to PSU PCB.
Replaced PSU capacitors with new.
Replaced original power cord with new 3-prong grounded IEC power cord.
Removed battery holder and cleaned. Replaced batteries.
Removed Start/Stop button and Tap buttons. Replaced both with custom 3D-printed button/adapter PCB and mechanical Cherry MX key-switch assemblies for improved performance—each switch rated to 50 million key presses. No more having Start/Stop or Tap buttons fail on you during live performance or while banging the box in the studio.
Diagnosed poor maraca sound quality to incorrect voltage level at noise generator. Identified root cause of voltage issue to dirty VR trimmer. Removed trimmer, cleaned and replaced. Adjusted trimmer to recommended level.
Removed step switch board. Cleaned module. Four step switches were not triggering smoothly & consistently, Identified a broken step switch actuator, replaced with new.
Replaced 4 poorly performing tact switches with new. Improved tactile feel of step switches by raising height of switch actuators.
Tested step switch ribbon cable as working properly and cleaned the contacts.
Calibrated unit to factory procedure. Cleaned all output & trigger jacks.
This is an 808 ready to go the distance with you in the studio and on tour!"