Amplifiers Vox JMI AC30 Super Reverb Head and Cabinet Vintage Pre-Owned

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Pre-Owned early AC-30 Super Reverb Twin - RARE Head with reverb+Box JMI Product 1965. Serial Number 05132.

Looks to have had a few capacitors and resistors replaced. Also it appears that a cathode bias potentiometer has been added as well as output jacks for different ohmage speakers.

Basically its a AC30/6 chassis with TB-controls in the upper main panel. The controls for the Vox-reverb system have been located in a chassis on the backpanel. A 3-way rotary switch can assign the reverb either to the "Normal" or the "Brilliant" channel. (AC-30/6 S/T) electric guitar amplifier. Perhaps the most desirable 1960’s amplifier ever made, the AC30 has been showcased on some of the most famous recordings of all time, and has become synonymous with the tone of classic British rock. Perhaps the rarest mid-’60s AC30 model, this is the definitely the most deluxe version, with a separate cabinet, an amp head featuring both factory Top Boost and Reverb. Both VOX enthusiasts and tone fanatics will rejoice, as this is an incredible sounding exotic example.

The original version of the AC-30 Super Twin head used a standard AC-30/6 amplifier chassis installed into a rectangular head cabinet.Vox felt that separating the head from the speaker cabinet would improve dependability over the combo version of the amp by isolating the chassis from the direct vibrations emanating from the speakers.


The AC-30 "Super Twin" Speaker Cabinet. The Super Twin speaker cabinet was an adaptation of the original AC-30 combo amp cabinet, less control panel cutout. The number of handles was reduced from three on the combo amp to one on the speaker cabinet. Super Twin speaker cabinets normally had closed backs, or were "pressurized," using Vox marketing speak. Closed backed cabinets enhance low end response, thus improving the performance of the AC-30 for bass guitar. However, not all AC-30 Super Twin speaker cabinets had closed backs. Some shared the same split open back configuration as the combo amp.Two 8 ohm Celestion/Vox 12" alnico speakers, wired in series to 16 ohms, powered the cabinet.


The Redesigned 1965 - 67 AC-30 "Super Twin" Amp Vox ramped up the appeal of the AC-30 Super Twin amp series in 1965 by adding an optional chrome plated tubular steel swivel trolley, incorporating a reverb circuit and converting the head cabinet to a trapezoidal, or "slant sided" shape. This new amp was known as the AC-30 "Super Reverb Twin."

IMPORTANT NOTES ON DESIGN OF THE REVERB TANK:

The Vox reverb pan used a single delay spring stretched between the needle saddles of two ACOS GR71 crystal phono cartridges. These cartridges were used as the reverb drive and receive transducers. For those currently wishing to make repairs to this reverb pan, ACOS GR71 replacements are no longer available.


About all one could say about the JMI reverb pan is it worked to a degree, but the tone and depth of the reverb was certainly lacking when measured against comparable Fender amps. Furthermore, this phono cartridge based reverb pan would easily slip into a howling acoustic feedback if the amp was played too loudly. This tendency towards feedback forced Vox to restrict the installation of their reverb circuit to amp heads. Locating the reverb pan in the amp head distanced the microphonic phono cartridges from the speakers and minimized feedback.

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