Complete BA312-M upgrade kit for Vintage Marantz models 2250, 2250B, 2265, 2275, 2285, 2325, 2330.

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ba312 replacment IC in marantz

For use in Marantz Models

Marantz 2250
Marantz 2250B
Marantz 2265
Marantz 2275
Marantz 2285
Marantz 2325
Marantz 2330

The BA312 Upgrade Module

Each kit contains (X2) BA312-M replacement modules fitted with our SS3601 Discrete Op Amps as well as (X4) Nichicon UKA/UKT capacitors and low noise Vishay carbon film resistors. Installation instructions are provided in the kit and can also be downloaded in PDF format using the links above.

For vintage Marantz Receivers, the BA312 IC  resides on the PE-01 tone control assembly, and are always in the signal path regardless of the tone control settings.   Be sure to order the appropriate upgrade module depending on whether it is needed for Marantz (BA312-M) or Sansui (BA312-S) as they have different gains and require slightly different components to be swapped out during installation.

With this upgrade, one can expect a flatter frequency response, a reduction in Total Harmonic Distortion (THD) and a lower noise floor.   Overall, this upgrade will bring the PE01 assembly in the Marantz, to the next level of performance with a distinct improvement in overall dynamic presentation, sound stage, and frequency response across the audible spectrum while retaining their smooth characteristic sound.