Known Issues
- Aging electrolytic capacitors and heat-cycled solder joints in older units.
- Inconsistent prior-service quality across surviving examples.
- Cosmetic restoration often required due paint wear and handling marks.
Product Archive
Route 66
Commemorative six-channel model built around combined M25 and M44 amplifier sections in one white powder-coated chassis.
Category
Special Series
Series
Route Series
Era
1990s limited edition (archived FAQ + manual sources)
Specifications
- Architecture
- Combined M25 + M44 sections under one heatsink (6-channel layout)
- Output Power (4 ohm stereo @ 12/13.8V)
- (M25, M44) 25/65 x2, 40/55 x4 WRMS
- Output Power (2 ohm stereo @ 13.8V)
- (M25, M44) 70 x2, 80 x4 WRMS
- Output Power (4 ohm bridged @ 13.8V)
- (M25, M44) 140 x1, 105 x2 WRMS
- Crossover Frequencies
- 30Hz to 600Hz
- Crossover Slopes
- 12dB per octave
- Bass EQ
- 0 to +12dB @ 45Hz
- Input Sensitivity
- 200mV to 2V
- Minimum Impedance
- 2 ohm bridged / 1 ohm stereo
- Case Dimensions
- 26.25"L x 10.63"W x 2.0"H
- Dimensions w/ flanges + terminals
- 26.25"L x 11.63"W x 2.0"H
Visual Identification Notes
- White powder-coated chassis with Route 66 graphics and six-channel layout.
- Rear section is based on M25, while front/sub sections are based on M44.
- Factory trim, screw finish, and silkscreen wear vary across surviving examples.
Recommended Service Actions
- Capture baseline voltage/current behavior before parts replacement.
- Prioritize power-supply health checks and connector integrity.
- Record all replaced parts and post-service measurements for traceability.
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
- Route 66 power supply refresh baseline
Structured starter workflow for inspecting and refreshing aged power supply components in Route-era amplifiers.
- Signal-path noise diagnosis (generic workflow)
Template process for hum, hiss, and channel imbalance root-cause analysis before replacing semiconductors.
Related Forum Threads
- Route 66 recap BOM sanity check
Community checklist for capacitor substitutions, lead spacing, and verification photos.
- Catalog scans and ad archive (contributor thread)
Crowdsourced scan quality standards and indexing conventions for source documentation.
Gallery
Route 66 amplifier photo
Archived Route 66 product image from Phoenix Gold FAQ M Special Edition page.
Route 66 manual cover
Owner-manual cover extracted from archived PDF for visual identification and layout reference.
Route 66 manual page 2
Manual interior page used as technical and historical reference material.
Route 66 manual page 3
Additional manual page for control labels, tables, and period styling details.
Historical Notes
Route 66 Platform Context
Secondary source material describes Route 66 as a tribute model built around combined M25 and M44 amplifier sections in a 6-channel layout. Reported production estimates exist, but official totals are noted as unpublished.
Source-Backed Verification
Phoenix Gold early brand and amplifier timeline
Imported - Needs Primary Verification- Phoenix Gold is described as starting around 1988 as an accessories-focused brand.
- The source states first mobile amplifiers appeared around 1990 (including MS-250 and MS-2125).
- The source describes early boards as 24K gold plated and notes M-series launch progression shortly after.
Source: Phoenix Gold Registry - History
Open source pageRoute 66 platform notes
Imported - Needs Primary Verification- Route 66 is described as a tribute model named after US Route 66.
- The page states Route 66 combines M25 and M44 amplifier sections into a 6-channel design.
- The source suggests roughly 1200 units from collected data, while also stating official production numbers were not published.
Source: Phoenix Gold Registry - Route 66
Open source pageFAS 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 - M Special Edition
Primary source used for Route 66 specifications and product photo.
Open sourceRoute 66 Owner Manual (archive PDF)
Primary manual source for controls/functions and period technical references.
Open sourcePhoenix Gold Registry - Route 66
Secondary context source. Registry tables intentionally excluded.
Open source
Model Disclaimer Block
Independent enthusiast archive entry. Not affiliated with or endorsed by Phoenix Gold.