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1964 Fender Vibroverb Blackface era tube-amplifier  

Cosmetic condition: good / very good

Upgrades/modifications:

  • New 3-prong grounded cord, some tube replacement, a few caps changed, later added FS.

Serviced: yes

Technical Description: 

The 1964 Fender Vibroverb AA763 is one of the rarest and most desirable pre-CBS Fender amplifiers. Introduced in late 1963, it was the first blackface Vibroverb and remained in production only through 1964. The tube chart code “NA” identifies an amplifier assembled in January 1964 (“N” = 1964, “A” = January), making it one of the earliest production examples of the AA763 circuit.

Specifications:
  • Black panel
  • Black tolex – original silver grill cloth
  • Original transformers
  • Original 1964 15″ JBL D130 speaker – imp. 8 ohms – serial # 84054 – cone stamp is 21057
  • Original spring reverb tank
  • TubeChart: AA763 – NA = Jan 1964
  • Tube layout: GZ34 + 6L6GC + 6L6GC + 12AT7 + 12AT7 + 7023 + 12AT7 + 7025 + 7025
  • Channels = TWO – Normal and Vibrato
  • Inputs = 2 per channel
  • Cabinet – finger-jointed solid pine
  • Covering – black tolex with silver/black grille cloth
  • Weight – approx 57 lb (26 kg)
Controls:

Normal Channel

  • Volume
  • Treble
  • Bass
  • Bright switch

Vibrato Channel

  • Volume
  • Treble
  • Bass
  • Bright switch
  • Reverb
  • Speed
  • Intensity

The amplifier features Fender’s optical (“roach”) tremolo and tube-driven spring reverb, with both effects available only on the Vibrato channel.

JBL D130 15-Inch Speaker:

The JBL D130 is a high-efficiency Alnico 15-inch loudspeaker originally developed as a full-range transducer. Fender offered JBL speakers as premium upgrades, and very early Vibroverbs can be found with the D130 before the Fender-specific D130F designation became standard. Factory-installed only on some early examples.

Typical Specifications:
  • Diameter: 15 in (380 mm)
  • Magnet: Alnico V
  • Voice Coil: 4 in edge-wound aluminum ribbon
  • Sensitivity: Approximately 103 dB SPL
  • Nominal Impedance: 8 Ω or 16 Ω (Fender versions commonly 8 Ω)
  • Cast aluminum frame
  • Aluminum dust cap
Tonal Characteristics:

The JBL D130 contributes significantly to the Vibroverb’s distinctive voice:

  • Exceptional clean headroom
  • Very high efficiency and volume
  • Extended high-frequency response
  • Fast transient response
  • Tight, articulate bass
  • Strong projection and clarity
  • Reduced speaker breakup compared with Jensen or CTS alternatives
Transformer Set:

Original transformers typically carry 606 manufacturer codes dating from late 1963 on January 1964 examples, including:

  • Power Transformer
  • Output Transformer
  • Choke

Matching late-1963 transformer date codes are consistent with an authentic January 1964 (“NA”) production amplifier.

* Manufacturing date codes and interior pics are available per request: e-mail

Weight 30 kg
Dimensions 80 × 60 × 70 cm

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