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.

From this point the voicing/model (T, TB, B) is normally stamped in the upper panel of the serial number plate

NEW

Serial number 16026 B - currently in the USA

Chassis assembled by Burndept; number 8449. Parmeko transformers. Most of the original resistors and capacitors have been renewed. Speakers are new production Celestion blues. Handles are 1970s replacements.

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 16054 B

Copper panel; silver T1088 speakers. The cabinet still has its black vents.

Chassis assembled by Burndept. The Woden mains transformer has the date code "HV" = August 1964. In the preamp, a mixture of WIMA and Mullard mustard caps.

Serial number 16083 TB - currently in the UK

Grey panel, integral top boost controls; dome voltage selector. Silver Celestion T1088s.

Serial number 16090 TB

As above, grey panel, integral top boost controls. Parmeko transformers, the mains perhaps rewound; voltage selector replaced. The original cover for the amp survives. The silver Celestion T1088s have been replaced with blues, date code "10CJ" = 10th March 1964 for their manufacture, Pulsonic cone code "52H1777". Thanks to Gabe for the pictures and info.

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.

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.

Updated

Serial number 16431 T - currently in the UK

Shots of the exterior only for the time being.

2026: - now broken up by a serial breaker up of AC30s.

Serial number 16500 - currently in the USA

Existence recorded by Jim Elyea

Serial number 16531 T

Cabinet and silver Celestion T1088s only. Original wiring gone. The cab is covered in (original) thick dark grey textured vinyl; brown grille cloth.

Serial number 16541 T - 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.

NEW

Serial number 16574 B - currently in the UK

Pictures of the exterior only for the moment. Grey panel, dome voltage selector. Heavy textured vinyl on the cabinet, perhaps varnished over in places; new grille cloth. Black metal vents on the cabinet top with holes drilled for screws.

Serial number 16580 T - 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. "VOX" logo in single letters.

NEW

Serial number 16635 T - currently in the USA

Chassis assembled by Burndept. Grey panel, dome voltage selector. Cabinet covered in dark grey textured vinyl. Grille cloth renewed. The "VOX" logo is in single letters. The preamp looks to be in good order; original Celestion silvers in place.

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.

NEW

Serial number 16704 T - currently in the UK

Chassis number 08499. Grey panel; dome voltage selector. In the preamp, visible Mullard mustards have "A4N" and "C4N" date codes = first and third quarters of 1964 for their manufacture. The original Celestion silvers are in place. A later Top Boost unit has been added.

NEW

Serial number 16763 T - currently in the UK

Pictures of the exterior only at present. Grey panel, dome voltage selector. Cabinet covered in textured black vinyl; brown grille cloth. The "VOX" logo is in single letters. In the speaker compartment, a pair of recent Fanes.

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

The chassis that left the factory in this box (with serial number plate) is now gone. In its place, added more recently, a 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.

2024 / 2025 the amp is on sale in the USA (California). No clear shot of the serial number plate is given, but the holes left by the metal handles (now replaced) are shown in detail. The aluminium plate and jack socket are still present. The Celestion blues, presumably from the AC30 from which the chassis was taken, have 11th March 1964 date codes - "11CJ".

Serial number 16941 T - currently in Europe

Grey panel, dome voltage selector. Celestion silver T1088s. Basketweave vinyl, black grille cloth.

Serial number 16947 T - currently in the UK

The original speakers look to be in place though the wiring in the compartment is new. Centre cabinet handle no longer present; the outer handles have rectangular panels but no "VOX" logo.

Serial number 16960 - currently in the UK

No component date codes currently visible in the preamp or power section. Genuine JMI Top Boost electronics from later 1965 (one of its Hunts caps has the date code "IYS" = 30th week of 1965) added via flying leads in the speaker compartment. The box and face plate look to be part of some 1980s kit.

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.

On to serial numbers in the 17000s.

Back to serial numbers in the 15000s.