Vox AC30: copper panels
Late 1963 to early 1964: serial numbers in the 9000s
Serial number 9038 B.
Continued from the page on AC30s with serial numbers in the 8000s. Amps below are mostly covered in black basket-weave vinyl.
Vox contracted out the assembly of AC30 chassis to two companies: Burndept Electronics in Erith, and Westrex in Dollis Hill (north London). A sure sign of production by Burndept is the presence of a stamped serial number on the aluminium upright of the preamp (normally on the right hand side a little way below the voltage selector):
Detail of serial number 9916. Chassis number 02607. The sequence began at 1000, but chassis awaiting assembly 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. Serial numbers in the 9000s have date codes for 1963, the letter for the year being "U".
Mains transformer in serial number 9916 - "72318 & J/82" 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 "HU" = August 1963.
The Woden part numbers were, in order: mains transformer now no. 72318 (in place of the earlier 66309); output transformer no. 66310; and the choke no. 66311.
A good indication that a chassis was assembled by Westrex is the presence of Albion tranformers. Dark brown Dubilier resistors are found along with white Eries.
Cabinets are for the most part covered in black basketweave vinyl, though some have pebble (dimpled). Back boards as a rule now have radiused corners rather than square.
Speakers continue to be the Celestion blue (alnico magnet, Celestion part no. T530). Those in serial number 9434 have December date codes.
Serial number plates are still hand stamped. Just to note again, "N" indicates "Normal" voicing (schematic OA/026 and OS/065), "B" is bass voicing. No early schematic survives for the bass circuit, though in relevant respects most amps (from 1962 on) follow OS/065, drawn in September 1964.
If anyone knows of further early copper panel AC30s that should be incorporated on this page, do let me know.
Serial number 9038 B - currently in Europe
Serial number 9253 N - currently in Europe
Serial number 9335 - currently in the USA
Existence reported by Jim Elyea.
Serial number 9365 N - currently in the USA
A Twin and Super Twin speaker cabinet re-covered in fabulous sparkle vinyl.
Serial number 9394 N - currently in the USA
Basketweave vinyl. Both amp and cab have features which generally come in later - black vents and silver alnico speakers.
Serial number 9434 N - currently in the UK
Chassis no. 02238. The Woden transformers have the date code "KU" = November 1963. The green ceramic Welwyn cathode resistor (underchassis) has "UM" = December 1963. The Celestions have "07LH" = 7th December, 1963.
Serial number 9479 N - currently in the UK
Pebble (dimpled) black vinyl. The Woden transformers have the date code "JU" = September 1963.
Serial number 9535 B - currently in the UK
As above, pebble (dimpled) black vinyl. Further pictures to follow. The preamp has Mullard mustard caps with the date code "A4N" = first quarter of 1964.
Serial number 9577 - currently in Europe
Serial number 9664 B - currently in the USA
A Super Twin amplifier section. Pictures only of the exterior for the time being.
Serial number 9677 B - currently in the UK
A Super Twin, Bass flag on the amplifier front. The Woden mains transformer has the date code "JU" = September 1963. The output transformer has "LU" = November 1963.
Serial number 9715 B - currently in the UK
Thanks to John for the pictures.
Serial number 9775 B - currently in the UK
Chassis no. 2412. New orange basket-weave vinyl. Woden transformers with date codes "HU" and "JU" = August and September 1963.
Serial number 9781 N - currently in the UK
Choke replaced. The Woden mains and output transformers have the date code "AV" = January 1964.
Serial number 9790 - currently in the USA
Existence reported by Jim Elyea.
Serial number 97xx N - currently in the UK
Only the voicing ("Normal") and the first two digits of the serial number given by the seller..
New black vents begin to be seen at this point
Serial number 9851 N - currently in the UK
The serial number plate is a later addition to the amp and cabinet on which it now travels. The cabinet is of the older type with square corners for the backboards, and may have been recovered in pebble vinyl at factory. The amplifier chassis, which belongs with the cabinet, dates from early 1962.
Serial number 9885 - currently in the UK
Further pictures to come. The Woden transformers have the date code "AV" = January 1964. Chassis assembled by Burndept.
Serial number 9916 B - currently in Europe
Chassis produced by Burndept, no. 2607. The Woden transformer has the date code "KU" = October 1963.
Serial number 9917 N - currently in Europe
Chassis number 02333. Dimpled (pebble) vinyl. Woden transformers with date codes "HU", "JU" and "KU" = August, September and October 1963.
Serial number 9922 N - currently in Europe
Serial number 9952 N - currently in the UK
A Super Twin. Top boost controls on the back panel. Picture to follow
Serial number 9979 N - currently in the UK
A nice Super Twin with top boost and an original set of covers.
SERIAL NUMBERS UNKNOWN
Currently in the USA
Woden transformers have the date code "JU" = September 1963.
Currently in the USA
Woden transformers with date code "KU" = October 1963.