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Vox AC 30 6TB Blue Speakers: How to Set Up, Maintain, and Troubleshoot Your Amp



Under encouragement from Vox, Celestion reissued the Vox Alnico Blue speaker for the new AC30TBX. The AC30TB used the Celestion Greenback. The only difference between the AC30TB and the AC30TBX was the speakers.




vox ac 30 6tb blue speakers




This first generation of AC30s were housed in "TV-front" cabinets, much like the early to mid-50s tweed Fender amps, and had a single 12-inch Goodmans 60-watt speaker, as opposed to the later, conventional twin 12-inch speaker configuration. These early amps sported a thin white covering ("Rexine") with a small printed diamond pattern and larger diamond pattern grill cloth. However, the EL34-powered AC30 was short lived, and a new AC30 version appeared in late 1959. This second generation AC30/4 had two channels with two inputs, hence the "4" in the model name, and a single tone control, and was powered by a quartet of EL84 (6BQ5) power tubes, making it truly a doubling of the AC15 power amp circuit. The AC30/4 also carried over the AC15's preamplifier circuit, which included the EF86 pentode in its "Normal" channel. Vox initially offered a 112" version but subsequently introduced the 212" AC30 Twin, which solved the volume problem at larger venues. The first AC30 Twins used two Goodmans Audiom 60 15-Watt Speakers, followed by Celestion G12 alnico speakers.[3]


The Rose Morris company, who owned the Vox name through the 1980s, sold Vox to Korg in the early 1990s, who then manufactured a reissue of the early '60s AC30 Top Boost, correcting previous inconsistencies ranging from the correct style grille cloth to the GZ34 rectifier tube. These AC30 amps were mostly offered in the traditional black Tolex/brown diamond grille configuration, but were also available in limited numbers with purple, red, or tan tolex. These amplifiers, like all AC30s to this point, were manufactured in Great Britain. These were available with a choice of Celestion "Blue" or "Greenback" speakers. In the mid 1980s, a company in Marlborough, MA, called Primo, imported and began re-distributing the AC30s in the U.S.[citation needed]


At the 2010 Winter NAMM expo Vox introduced the Custom series; these models were updates to the 2004 Custom Classic series amplifiers and featured two channels (Normal and Top Boost) with two inputs for each channel (High and Low), more akin to the original AC30/4 layout released in 1958. It was available with either Greenback speakers (C2) or Alnico Blue Speakers (C2x), and was also available as the AC15. Later limited edition models include the AC30BL, a tygoon blue tolex with grey speaker cloth, an AC30C2RD with a red finish, an AC30C2-BRG a British Racing Green tolex finish with a grey speaker cloth and the AC30C2 Black Comet; featuring a patterned finish all are identical to the C2. The amp featured an option known as "Jumping" where the High-Normal channel could be linked to the Low-Top Boost channel with a patch lead, whilst the guitar is plugged into the High-Top Boost channel, allowing both channels to sound and create a fuller, thicker overdrive sound. The amp also featured a solid-state rectifier to increase reliability. Controls include a Normal volume, Top Boost Volume, Treble and Bass controls, Reverb Tone and Level controls, Tremolo Speed and Depth controls, a Tone Cut control (to add further control over the higher-frequencies), a Master Volume, and a Standby and Power Switch. A true bypass effects loop, extension cab output and external cab output were also included; as well as an input for the external foot switch (to control Reverb and Tremolo). The amps are produced in China. The amps were released to critical success, garnering awards such as Music Radar's "Guitarist Choice" award.[citation needed]


Introduced in 2010, the amp featured Hand-wired turret board construction (against cheaper PCB construction), Birch-ply cabinets featuring solid bracing and a natural high frequency diffuser (versus MDF cabinets and no high frequency diffuser); All-tube design (different from the Custom series tube pre/power amp but solid-state rectifier); ECC83/12AX7 preamp tubes (3) EL84 power tube quartet; (AC30 models); EL84 Duet (AC15 models); GZ34 rectifier (AC30 models); EZ81 rectifier (AC15 models); came factory-fitted with matched Ruby Tubes to provide extended dynamic range; maintained the traditional VOX two-channel design (Top Boost and Normal. High and Low inputs for each channel); the Normal channel features an additional BRIGHT switch; The top boost channel features a HOT/COOL switch to achieve even more gain. A Master Volume/BYPASS switch completely bypasses the Master Volume section allowing incredible levels of gain and sustain to be achieved. OP mode switch cut the amp's Output Power level in half (30 > 15 on the AC30, 15 > 7.5 on the AC15) allowing higher levels of saturation to be achieved at lower volumes. A Vintage fawn-colored vinyl covering, reminiscent of the 1960 classic AC30 and was available with either Celestion Alnico Blue or Celestion G12M Greenback speakers. A VFS1 footswitch controls the Top Boost channel's HOT/COOL switch was also included.[citation needed] The Heritage series 50th anniversary models incorporate the classic EF86 pre-amp tube, which although subject to failure in the late '50s had been re-introduced and improved. The classic EF86 pre-amp tube is remarkable for its high gain and for the notable harmonic overtones it produces and feeds to the power tubes when driven into distortion, providing the creamy distinctive VOX sound of the early hand made amplifiers produced by Jennings of Dartford. Clapton, Cream, Pink Floyd and Queen are ambassadors to the success of the early AC30s. The Heritage series 50th anniversary model stands alone as either the AC15 or AC30 with this distinct circuitry not found in the current VOX line-up.


As of 2006, a company having licensed the name JMI (Jennings Musical Instruments) began manufacturing period correct, British made AC30 "copy" amplifiers, available in both black and beige. Since this incarnation of JMI has never owned the Vox brand, their official website lists the disclaimer "JMI amplification are in no way affiliated with Vox amplification (Korg)", and the models are listed as 30/6 (6 input) and 30/4 (4 inputs, sans "Brilliant" channel). As originally the case in the 1960s, Top Boost is offered as a retrofit upgrade and is not standard, and the original configuration 4/6 inputs are offered with options for Green/Blue speakers, the blue speakers being similar in appearance to the Celestion alnico speaker but made by Fane International with fiberglass voice coils, which allow them a much higher 100 watt power rating. JMI later changed alnico speakers to ones made by Tayden.[citation needed]


Though widely believed to be a class A amplifier, the AC30 is in fact class AB.[11][12][13] It uses a quartet of cathode-biased EL-84 output tubes in push-pull configuration. The high bias condition is believed by some to be the source of the amplifier's famous immediate response and "jangly" high-end, though the lack of negative feedback, minimal preamp circuit, simple low loss tone stack, and the use of cathode biasing on the output stage play at least as large a role, if not larger.[14] The Celestion "Blue" speakers that are integral to the AC30 also contribute much to the sound of the unit. The two 12" 15-watt speakers, often overdriven and at the brink of their power handling capability, provide a cutting mid-range speaker sound that is immediate and sharp and a distinction from the Marshall or Fender-style amplifier.


Personally the lack of reverb and trem is a turn-off for me with the HW2X. From the pictures it does appear that these Blue speakers are Celestion UK speaker and not Chinese made ones (long debate over that as I'm sure you've seen before). If you've got the money, go for it!


My Vox doesn't have the Blue speakers so getting the HW2X would add that as a benefit and it would be nice having a master volume too. I think the AC30 is the perfect amp for me so I thought aim for the top and get the hand wired version over the Custom Classic.


I have an ac15HW, its an awesome amp pretty much sounds like the vox amps you hear on older recordings. Build quality "seems" top notch, i couldn't get my hands on the HWx version so i'm going to have to source a used blue if i can. The dynamics this amp has is more than impressive, love it.


I messed around with an ac15hw last weekend and was really impressed and it only had a greenback in it. Also played a black ac30 with blues. Master volume is useful but the amps sound best with the MV bypassed IMO.


Vox's Hand-Wired series amps are built with highly skilled craftsmanship and care to a detailed state that delivers a rich and powerful sonic experience. This 2x12" combo has two independent preamp circuits and a half power switch that allows the amp to drop to 15W. This example is all original, still housing its Celestion speakers. Cosmetically, it is in near mint condition with no damage or repairs to note. Not available for shipping - local pickup only.


Vox's Hand-Wired series amps are built with highly skilled craftsmanship and care to a detailed state that delivers a rich and powerful sonic experience. This 2x12\\\" combo has two independent preamp circuits and a half power switch that allows the amp to drop to 15W. This example is all original, still housing its Celestion speakers. Cosmetically, it is in near mint condition with no damage or repairs to note. Not available for shipping - local pickup only.


I like everything about this amp. I don't miss the vib/trem channel, the bright switch on the normal channel brings the non-top-boost JMI brilliant channel sounds and the 'hot switch on the top boost channel is to die for. The master volume is pretty useable and the half-power switch is a huge help in these days of stage volume restrictions. What a well-though-out take on the classic design. Did I mention the gorgeous fawn Nubtex? Even the stock greenbacks sounded pretty solid, but she really came alive when I installed a G12 blue and an H30 55hz clone. That pair of speakers really makes for a larger than life vox tone, clean or dirty. 2ff7e9595c


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