Vox AC30: copper and grey panels, Celestion silvers
Later 1964: serial numbers in the 16000s
Serial number 16337 TB, amp model and number machine stamped, voicing (TB = Top Boost) hand-stamped.
Continued from the page on AC30s with serial numbers in the 15000s. So far no Super Twins with stray numbers in the 16000s have come to light.
Grille cloth remains brown.
One finds four models: the "Treble", designated with a "T" on its serial number plate; "TB" for "Top Boost", normally with the circuit's controls integral in the control panel; "N" for "Normal" voicing, and "B" for Bass. The three last had their own schematics, in order: OS/056, OS/065 and OS/057. Some notes on the treble circuit, which was new in 1964, can be found on this page.
A growing collection of documents relating to the AC30 in 1964 can be found here.
Significant component date codes in amps on this page are mostly of later 1964: second and third quarters of '64 ("B/64", "B4N" and "C4N") for Mullard "mustard" caps; and "HV" and "JV" = August and September 1964 for Woden transformers.
The Woden mains transformer of serial number 16580 - "JV" = September 1964 for its manufacture.
The new-style Wodens have plain shrouds and a simplified internal construction - see this page. One also finds Albions and Parmekos throughout the 17000s.
Celestion silver alnicos - the T1088 - designed for JMI in the Spring of 1964 are now the norm. Amps with serial numbers in the 15000s occasionally still have blues. The earliest date codes known for Celestion silvers are from the middle of May.
Grey control panels, which are also to be found sporadically on amps with numbers in 12000s-13000s, are pretty well the norm too. For an exception, see serial number 16649, below. New-style dome voltage selectors are standard.
Two types of cabinet covering were used for amps with serial numbers in the 16000s - a textured dark grey "Levant" vinyl and standard basketweave.
As mentioned at the head of this page, serial number plates are normally machine stamped. The voicing - "N", "T" or "B" - is still hand stamped, however.
Below, a newsprint picture of Dick Denney, Al Larkins (engineer for the Vox Long Tom Echo unit), and Tony Fiske (Research Liaison Officer), outside 119 Dartford Road, published in December 1964. Inset, the label of an amplifier - probably an AC30 - off to Moscow. JMI made a good deal of breaking into the Russian market in 1966 - see this page on the Vox AC100 website. But a certain amount of trade took place well before that.
Local Kent newspaper, December 1964.
If anyone knows of further amps that should be incorporated on this page, do let me know.
Serial number 16013 T
Chassis assembled by Westrex. Black grille cloth; grey panel. A Treble model. WIMA capacitors in the preamp. Silver Celestion speakers. Still the old-style link voltage selector.
Serial number 16041 B - currently in the UK
Chassis number 8128. Grey panel, dome voltage selector. Parmeko transformers. The Mullard mustard capacitors have the date code "B/64" = second quarter of 1964. The blue Hunts cathode bypass caps have "HIT" = 21st week of '64 (last week of May). The footswitch is of the old circular type. A good well-used AC30. Silver Celestions. The grille cloth has been renewed with brown Rose Morris cloth. Thanks to Danny for the pictures.
Serial number 16083 TB - currently in the UK
Grey panel, integral top boost controls; dome voltage selector. Silver Celestion T1088s.
Serial number 16110 TB - currently in the USA
Grey panel, integral top boost controls. Silver Celestion T1088s. Chrome side stands for the cabinet. Basketweave vinyl; black grille cloth.
Serial number 16142 TB - currently in the USA
Grey panel, integral top boost controls. Slot voltage selector. Silver Celestion T1088s. The grille cloth has probably been renewed. Added on an aluminium panel on the back of the amp, jack sockets for external speakers and the footswitch. Textured vinyl on the cabinet.
From this point the voicing/model (T, TB, B) is normally stamped in the topmost panel of the serial number plate
Serial number 16169 TB - currently in Sweden
Grey control panel, integral top boost, dome voltage selector (now removed). Cabinet re-covered in red - the speakers are new Celestion blues.
Serial number 16240 N - currently in Italy
The "N" for Normal voicing is stamped in the lower panel of the serial number plate. The plate does not seem quite right for the cab - square corners to the back boards but covered in basketweave vinyl (?) - chassis (copper panel) or speakers (Celestion blues).
Serial number 16312 T - currently in the USA
Picture of the serial number plate only. The "T" is stamped in the plate's upper compartment.
Serial number 16322 TB - currently in the USA
Grey panel with integral Top Boost. Celestion silvers (probably reconed). Basketweave vinyl covering.
Serial number 16337 TB - currently in the UK
Excellent condition. Grey control panel, integral top boost, dome voltage selector. The speakers are Celestion silvers (T1088).
Serial number 16424 T - currently in Australia
Chassis assembled by Burndept. Grey panel, dome voltage selector. Parmeko transformers. In the preamp, WIMA and Mullard capacitors, the latter with "A4N", "B4N" and "B/64" date codes = first and second quarter of 1964. Silver Celestion T1088s. Textured vinyl on the body of the cabinet and the back boards; on the front top, basketweave. Later corner protectors with double pins added.
Serial number 16500 - currently in the USA
Existence recorded by Jim Elyea
Serial number 16541 - currently in Sweden
No pictures at present, but some notes on components: Woden choke date code "HV" = August 1964; Mullard mustard capacitors in the preamp "B4N" and "C4N" = second and third quarter of 1964; and Hunts capacitors "HWT" and "IYT" = 21st and 30th weeks of '64.
Serial number 16580 - currently in France
Grey panel, dome voltage selector. Woden transformers with date code "HV" (output) "JV" (choke and mains) = August and September 1964. In the preamp, Mullard mustard caps with date codes "B4N" and "C4N" = second and third quarters of 1964. Silver Celestion T1088s. The basketweave vinyl is now orangey red.
Serial number 16649 T - currently in Europe
Chassis number 08100. Copper panel, dome voltage selector (now removed). Celestion silvers. The Mullard mustard capacitors have date codes "B/64", B4N" and "C4N" = second and third quarters of 1964. The Woden output transformer has the date code "HV" = August 1964.
Serial number 16783 T - currently in France
Grey panel, dome voltage selector. Woden transformers with date code "HV" (output) "JV" (choke and mains) = August and September 1964. Textured dark grey vinyl. Silver Celestion T1088s.
Serial number 16845 T - currently in the UK
Copper panel chassis produced by Westrex, early / mid 1964; Albion transformers. The Mullard mustard caps have "A4N" and "A/64" date codes = first quarter of 1964. Speakers are Celestion blues, perhaps contemporary with the chassis, but incredibly late for a Twin at this point in production.
Serial number 16941 T - currently in Europe
Grey panel, dome voltage selector. Celestion silver T1088s. Basketweave vinyl, black grille cloth.
Serial number 16965 - currently in the UK
Grey panel non-Top Boost. Celestion silvers.
Serial number 16983 T - currently in the UK
Sold on ebay some time ago.