Known Issues
- High heat and current demand increase stress on aged components and wiring.
- Units may be missing period-correct accessories or have undocumented modifications.
Product Archive
MS-1000
Large-format special platform documented as two MS-2250 sections integrated into one long heatsink design without fan shrouds.
Category
Special Series
Series
Special Series (MS/M Based)
Era
1990s special platform (archived FAQ + secondary context)
Specifications
- Architecture
- Dual MS2250 sections in one long heatsink chassis
- Output Power (4 ohm @ 12.5/14.4V)
- 250/340 WRMS x4
- Output Power (2 ohm @ 14.4V)
- 520 WRMS x4
- Output Power (4 ohm bridged @ 14.4V)
- 1060 WRMS x2
- Thermal Load Note
- Archived FAQ notes stable use at 4 ohm bridged or 2 ohm stereo due to heat limits
- Dimensions
- 34"L x 11.4"W x 2.4"H
- Collector Estimate
- Secondary registry material references a small run; verify before citing exact totals
Visual Identification Notes
- Extra-long chassis with special plating and visible plexi top references in period notes.
- Commonly identified as a dual-MS2250-derived layout.
- Document serial and internal labels before any service intervention.
Recommended Service Actions
- Use staged startup and high-capacity bench supply/current instrumentation.
- Validate thermal behavior under controlled load before long-duration testing.
- Inspect power path and grounds for voltage drop sensitivity.
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 referenceAudio-grade dual op-amp replacement
DigiKey: P23456-ND
Placeholder DigiKey reference. Verify stability and compensation in original circuit before bulk install.
Open DigiKey reference
Related Repair Guides
- Signal-path noise diagnosis (generic workflow)
Template process for hum, hiss, and channel imbalance root-cause analysis before replacing semiconductors.
Related Forum Threads
- Catalog scans and ad archive (contributor thread)
Crowdsourced scan quality standards and indexing conventions for source documentation.
Gallery
MS-1000 amplifier photo
Archived MS1000 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
Sources / Notes
Archived Phoenix Gold FAQ - MS Special Edition
Primary source for MS1000 architecture and power table values.
Open sourcePhoenix Gold Registry - MS-1k
Secondary context only; serial and total-count claims require primary corroboration.
Open source
Model Disclaimer Block
Repair information is provided at user's own risk. Verify all measurements and polarity before power-up.