Vox AC30: beige cabinets and copper panels

Early and mid 1963: serial numbers in the 6000s

An early copper panel.

Towards the end of 1962, Vox contracted out a proportion of the assembly of AC30 chassis to Burndept Electronics in Erith. Later, in early 1965, Jennings would move into Burndept's building - the "West Street Works".

A sure sign of production by Burndept is the presence of a stamped serial number on the chassis in front of the output transformer.

Detail of serial number 6097, below. Chassis numbers begin at 1000, but they were not used in any particular order.

Also indicative of production by Burndept at this stage is the presence of Woden transformers with handsome green shrouds. The earliest batches date from autumn '62.

Output transformer of serial number 6097. "66310" is the Jennings part number (for re-ordering). The transformers were specially made for JMI and do not figure in amps made by other makers. The date code is "JT" = September 1962.

The Woden part numbers were, in order: mains transformer no. 66309; output transformer no. 66310; and the choke no. 66311.

Other chassis were assembled for Vox by Westrex in North London (Dollis Hill). For certain batches of AC30, Westrex used dark brown Dubilier resistors, rather than the white Eries employed by Burndept. Note their presence in serial number 6310, below. It is too early to say whether from time to time Westrex also used Wodens.

Cabinets are mostly beige, though there are some in smooth grey charcoal or dark grey pebble covering. Back boards should have square corners.

Speakers continue to be the Celestion blue (alnico magnet, Celestion part no. T530). As before, serial number plates are hand stamped.

The page on AC30s with serial numbers in the 5000s, ; a new page on early Super Twins .

If anyone knows of further early copper panel AC30s that should be incorporated on this page, .

Serial number 602x N (?) - currently in Japan

After much indecision it seem best to leave the amp here. The first digit is difficult to make out properly - the bowl at bottom kicks out to the left like a "5" but the top curls over like a "6". All stamped "5"s - - have flat tops. The main preamp filter capacitor appears to have the date code "UC" = March 1963 ("U" = 1963 is definite).

Serial number 6023 N - currently in the UK

Serial number 6038 B - currently in the UK

Currently . The main filter capacitor in the preamp - made by TCC - has the date code "UE" = May 1963.

Serial number 6041 B - currently in the UK

The number on the serial plate said to be 6041B. The grey panel chassis is certainly later, perhaps the box too with its corner protectors.

Serial number 6045 - currently in the USA

Existence reported by Jim Elyea.

Serial number 6097 N - currently in the USA

Note that the back boards have rounded corners. The date codes on the Celestions are "31KG" and "08LG" = 31st November and 8th December 1962. Date codes on the Woden transformers are "HT" and "JT" = August and September 1962. One of the blue Hunts bypass capacitors in the preamp has the date code "HHH" = 22nd week of 1962. The chassis is number 01125.

Serial number 6117 N - currently in the USA

Transformers are Albions.

Serial number 6172 N - currently in the UK

Currently . Covering originally beige. Original Woden transformers in place, date code "LT" = November 1962.

Serial number 6210 - currently in the USA

Existence reported by Jim Elyea.

Serial number 6310 N - currently in Australia

Mains transformer and choke are Haddons, the output transformer Albion. One of the blue Hunts capacitors in the preamp has the date code "HUH" = 26th week of 1962. A TCC capacitor has the code "TJ" = September 1962. Thanks to Guy for the pictures.

Serial number 6313 - currently in the USA

NEW

Serial number 643x (later chassis in modified early cabinet) - currently in Japan

The cabinet, speakers and serial number plate are from mid 1963. The cabinet back-boards have square edges. Two-pin corner protectors, and late 1960s vents have been added however. The date codes of the Celestion blue speakers are "23GH" and "26GH", respectively 23rd and 26th July 1963. The chassis is later - from mid 1964. The preamp has Mullard mustard capacitors; the Albion transformers have post-63 paper labels; the TCC capacitors have the date code "VC" = March 1964; the value of the cathode resistor is 47R, the change from 80R (often in practice 82R) to 50R (in practice often 47R) having come in late 1963. The footswitch is of the later type too.

Serial number 6364 B - currently in South Africa

Bags of character in this one. Chassis assembled by Westrex. The original Celestion blues are in place: date codes 04MG and 18MG = 4th and 18th December 1963. Thanks to Nick for the pictures.

Serial number 6390 - currently in the USA

Existence reported by Jim Elyea.

Serial number 6424 B - currently in Spain

Serial number 6529 N - currently in the UK

The cabinet now divided in two. Smooth grey covering. Woden transformers, date codes unfortunately not visible. Further .

Serial number 6534 N - currently in the UK

The serial number plate sold on ebay some time ago.

Serial number 6590 - currently in the USA

Existence reported by Jim Elyea.

Serial number 6639 N - currently in the UK

Black pebble covering. Probably the original Celestion blues in place.

Serial number 6715 B - currently in the USA

Cabinet covered with black smooth pebble charcoal covering.

Serial number 6731 N - currently in the USA

Smooth charcoal vinyl. Leather handles on the cabinet.

Serial number 6763 N - currently in the USA

Serial number 6792 N - currently in the USA

Replaced grille cloth and speakers. The box and chassis look to be original - note the fine dark charcoal pebble vinyl of the cabinet.

Serial number 6804 N - currently in Europe

Serial number 6805 - currently in the USA

Existence reported by Jim Elyea.

Serial number 6822 B - currently in Europe

Recovered (?) in dimpled black and red vinyl. The vinyl of the bottom back board is different. Note that no holes for the outer two handles on top of the amp are visible. Piping and corner protectors are later additions. One of the pots has the date code "LJ" = December 1962.

Serial number 6920 N - currently in the UK

Black "pebble" or "dimpled" vinyl, leather handles. The transformers are Albions. One of the blue Hunts capacitors in the preamp has the date code "T HH" = 42nd week of 1962 = 15th-19th October, assuming that the Hunts factory was closed on Saturdays.

Serial number 6929 B - currently in Japan

Cabinet covered with black smooth pebble charcoal covering. Top boost added on the back panel. Transformers are Albions.

Serial number 6932 N - currently in the USA

Original red vinyl.

Serial number 6947 N - currently in the UK

Serial number 6950 N - currently in the USA

The cabinet has new style plastic handles.

SERIAL NUMBERS UNKNOWN

Serial number unknown - currently in the UK

With its original red cover. Woden transformer date code "LT" = November 1962. Celestion date code "13MG" = 13th December 1962.

Serial number unknown - currently in the UK

"Normal" voicing. Serial number plate lacking. The Woden transformers have date codes "LT" = November 1962 and the pots have "JJ" = October 1962. The chassis, assembled by Burndept for Vox, is number 01353.

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