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Product Archive

FAS-2300 (Frank Amp'n Stein)

Early Phoenix Gold limited special documented as combining MQ430 and MS2125 sections in one long heatsink platform.

Category

Special Series

Series

Special Series (MS/M Based)

Era

1992 limited run (archived FAQ source)

FAS-2300 amplifier photo
Archived Frank Amp'n Stein photo from Phoenix Gold FAQ MS Special Edition page.

Specifications

Limited Production
Approx. 300 units (archived FAQ statement)
Architecture
MQ430 + MS2125 in same heatsink (FAS2300)
MQ430 Output (4 ohm @ 12.5/14.4V)
30/50 WRMS x4
MQ430 Output (2 ohm @ 14.4V)
90 WRMS x4
MQ430 Output (4 ohm bridged @ 14.4V)
100 WRMS x2
MS2125 Output (4 ohm @ 12.5/14.4V)
125/160 WRMS x2
MS2125 Output (2 ohm @ 14.4V)
255 WRMS x2
MS2125 Output (4 ohm bridged @ 14.4V)
510 WRMS x1
Case Dimensions
25.5"L x 11.4"W x 2.4"H
Dimensions w/ flanges + terminals
26.5"L x 11.4"W x 2.4"H

Visual Identification Notes

  • Long multi-section heatsink with Frank Amp'n Stein special-run styling cues.
  • Archive photos should include top silk, endplates, and certificate/provenance if present.
  • Accessory completeness (crate/packaging items) should be logged separately.

Known Issues

  • Complex multi-section architecture increases service dependency between channels.
  • High age and low surviving count often means inconsistent prior repair quality.

Recommended Service Actions

  • Perform staged bring-up with strict current monitoring per amplifier section.
  • Document section-by-section measurements before and after service.
  • Preserve original cosmetic hardware whenever restoration goals allow.

Parts List

  • Main power reservoir capacitor (4700uF / 50V class)

    Original: 4700uF 50V radial electrolytic (legacy OEM variant)

    Replacement: 105C low-ESR radial capacitor, matched lead spacing

    Verification: Community Verified

  • Dual op-amp for preamp / crossover stage

    Original: Legacy dual DIP-8 op-amp (marking varies by production run)

    Replacement: Low-noise audio op-amp DIP-8

    Verification: Proposed

DigiKey Recommendations

  • 4700uF 50V low-ESR radial capacitor

    DigiKey: P12345-ND

    Placeholder DigiKey reference. Confirm ripple current, lead spacing, and can diameter against board footprint before finalizing.

    Open DigiKey reference

  • Audio-grade dual op-amp replacement

    DigiKey: P23456-ND

    Placeholder DigiKey reference. Verify stability and compensation in original circuit before bulk install.

    Open DigiKey reference

Gallery

FAS-2300 amplifier photo

FAS-2300 amplifier photo

Archived Frank Amp'n Stein photo from Phoenix Gold FAQ MS Special Edition page.

Historical Notes

  • MS-Series Manual Archive Baseline

    The Phoenix Phorum manual archive includes original MS-series documentation for MS250, MS275, MS2125, and MS2250, while the archived Phoenix FAQ indicates a 1992-1995 MS/MPS production window.

Source-Backed Verification

  • FAS and SoFAS limited-series context

    Cross-checked
    • Frank Amp'n Stein (FAS2300) is described as MQ430 + MS2125 in one heatsink with an approximately 300-unit limited run note.
    • Son of Frank Amp'n Stein (FAS2400) is described as a MS275 + MS2125 4-3-2 special platform with matching FAS406A crossover references.
    • MS1000 is described as two MS2250 sections integrated in one long heatsink with high thermal/current demand cautions.
    • FAS406A companion crossover values include 18dB/oct slope, 8V output level, and 100dB S/N in the same archived source.

    Source: Archived Phoenix Gold FAQ - MS Special Edition

    Open source page

  • Special-platform values verified against MS/MPS baseline tables

    Cross-checked
    • MS2125 values shown in FAS2300/FAS2400 sections match MS/MPS baseline values: 125/160 x2 (4 ohm), 255 x2 (2 ohm), 510 x1 (bridged 4 ohm).
    • MQ430 values listed in FAS2300 match MQ430 values in MS/MPS page: 30/50 x4 (4 ohm), 90 x4 (2 ohm), 100 x2 (bridged 4 ohm).
    • These overlapping numbers are tagged as verified from multiple archived sources in this site.

    Source: Archived Phoenix Gold FAQ - MS/MPS Amplifiers

    Open source page

Sources / Notes

  • Archived Phoenix Gold FAQ - MS Special Edition

    Primary source for FAS2300 architecture, production note, and power tables.

    Open source

Model Disclaimer Block

Repair information is provided at user's own risk. Verify all measurements and polarity before power-up.

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