Blue Note Certified™

Certificate of Authentication

PAUL REED SMITH HDRX 20 HEAD AMPLIFIER

BLUE NOTE CERTIFIED AUTHENTICATION

Manufacturer: Paul Reed Smith (PRS)
Model: HDRX 20 Combo
Serial Number: AMP026-02901
Chassis Number: 301773
Year of Manufacture: 2022
Country of Manufacture: Indonesia
Configuration: Head Amplifier

Dimensions: 17.25" W × 9.25" H × 9" D
Weight: 20 lbs.

CERTIFICATION

After a comprehensive physical inspection, electronic examination, and originality verification, this amplifier has been evaluated according to the Blue Note Certified™ Authentication Standards.

The following components were found to be original and authentic at the time of inspection:

• Original plywood cabinet

• Original factory tolex covering

• Original grille cloth and grille frame

• Original chassis

• Original control panel and faceplate

• Original control knobs, switches, and pilot light

• Original factory hardware

• Original factory PCB circuit

• Original transformers

• Original choke

• Original wiring harness and factory lead dress

• Original solder joints

• Original power tubes

• Original preamp tubes

• Original rectifier

• Original tube retainers and shields

Inspection revealed:

• No evidence of structural repair

• No additional chassis holes

• No evidence of unauthorized circuit modifications

• Factory transformer set present

• Factory wiring and solder work remain intact

• Circuit conforms to original PRS factory layout

• Excellent cosmetic condition throughout

TRANSFORMER VERIFICATION

CONDITION ASSESSMENT

Cosmetic Condition

Excellent

The cabinet, covering, grille cloth, hardware, chassis, and control panel exhibit only minimal signs of normal handling. Overall presentation is exceptionally clean and well preserved.

Electronic Condition

Excellent

Factory electronic components remain intact with no evidence of excessive modification. Factory PCB construction, lead dress, and solder joints remain consistent with original production.

Structural Condition

Excellent

No structural damage or alterations were observed. Cabinet dimensions, construction methods, and chassis installation remain factory correct.

TONE & PERFORMANCE EVALUATION

Performance Summary

The HDRX 20 delivers exceptional tonal balance with outstanding clarity, articulation, and dynamic response. Noise performance is virtually silent, while the amplifier produces deep, controlled bass, rich harmonic midrange, detailed treble response, and excellent projection. Clean headroom remains strong before transitioning into smooth, musical overdrive characteristic of the HDRX design.

ORIGINALITY CLASSIFICATION

Collector Grade

This amplifier retains an exceptionally high level of originality with its factory transformers, cabinet, electronics, wiring, hardware, and tubes remaining intact. Cosmetic wear is minimal, and no evidence of unauthorized modification was found during inspection.

Estimated Originality:
98–100%

FINAL AUTHENTICATION

✅ FULLY AUTHENTIC

Based upon the inspection findings, this amplifier is certified as:

BLUE NOTE CERTIFIED™ — FULLY AUTHENTIC

The amplifier retains its original factory construction, electronics, transformers, circuit design, hardware, and overall configuration. No evidence of significant modification or restoration affecting originality was observed.

Technician

Kevin Carmody

Blue Note Certified™ Authentication Division

Inspection Date: July 28, 2027

BLUE NOTE CERTIFIED™

Integrity • Originality • Provenance • Performance

This certificate represents the condition and originality of the amplifier on the date of inspection and is based upon visual, mechanical, and electronic examination using accepted vintage amplifier authentication standards.