Below, a list of early chassis produced by Burndept arranged by serial number. Salient component date codes are given where known.

Just to note that the chassis were stamped with numbers BEFORE assembly. They were stored, then taken to the work benches for wiring up, in no particular order.

For the time being the date codes are presented without comment. Relevant info in the lists below exists currently for only around 24 amps from a span of over 1000 (in terms of serial number range), far too few for the constructing of hard and fast "rules". Certain patterns can nonetheless be discerned: these will no doubt consolidate as further details come to light.

As for the question of readiness for sale - in other words, the point at which an AC30 was complete - the Celestion blues were generally speaking the latest element to be fitted. Stock sat on shelves for weeks, sometimes months. No "ready reckoners" operate unfortunately.

It should perhaps be mentioned that in some quarters AC30s are being dated by the supposed date of the chassis alone - either by taking the Woden transformer date codes and simply adding a month, or by insisting that the Woden date codes ARE the date of assembly. Retrogression appears to be the fashion (date as early as possible). The less said about all that the better.

Last, simply to remind that Westrex was still the chief assembler of chassis for JMI during this period. Known surviving amps tend to indicate that during the course of 1963 Burndept was asked to increase production, however.

Complete AC30s

5634: Woden date codes "HT" = August 1962. Pot "GJ" = July 1962.

5648: Woden date codes "HT" = August 1962. Pot "GJ" = July 1962. Chassis 01033.

5650: Woden date codes "HT" = August 1962. Hunts cap. with "HHH" = 22nd week of '62.

5672: Hunts cap. "ITH" = 34th week '62 (August). Pot "GJ" = July 1962.

5726: Woden date codes "HT" = August 1962. Pot probably "GJ" = July 1962. A Super Twin with original Top Boost unit on its back panel. Hunts capacitor "HIH" = 23rd week '62. Chassis 01061

5676: Hunts caps "HHH" = 22nd week of 1962 (late May). Pot "GJ" = July 1962. Chassis 01185.

5757: Woden date codes "HT" = August 1962.

5937: Woden date code "LT" = November 1962.

6097: Woden date codes "HT" and "JT" = August and September 1962. Hunts caps "HHH" = 22nd week of 1962 (late May). Chassis 01125. Speakers: 31st October and 8th November '62.

6172: Woden date codes "LT" = November 1962.

6000s: Woden date code "LT" = November 1962. Pots with date codes "JJ" = October 1962. Chassis number 01353.

6000s: Woden date code "LT" = November 1962. Speakers: 13th December 1962.

6000s: Woden date code "LT" = November 1962. Hunts caps with "THH", and the main preamp filter "TSH" = 42nd and 45th week 1962 (October and November). Chassis 01329. Speakers: 11th and 15th January 1963.

6529: Woden date codes "LT" = November 1962.

6534: Woden date codes "LT" and "MT" = November and December 1962. Chassis 01381. Speakers: January 1963.

6664: Woden date codes "HT" = August 1962. Hunts cap. "ITH" = 34th week '62 (August). Chassis no. 01134.

6716: Woden date codes "AU" = January 1963. Hunts cap. "xTI" = 4th or 14th week of 1963.

Chassis numbers

Chassis numbers are given in numerical order simply for convenience. Some entries refer to amps listed above. Those with fuller descriptions are loose chassis, sold or shown without cabinet or speakers. An overview of Burndept's numbers can be found here.

Chassis 01028: Possibly Hunts cap with "TAH" date code = 49th week 1962.

Chassis 01033: serial number 5648 above.

Chassis 01050: Woden date codes "HT" = August 1962.

Chassis 01053: Woden date codes: "HT" = August 1962. Pot codes ending in "J" = 1962, either "HJ" or "IJ" = August or September 1962.

Chassis 01061: serial number 5726 above.

Chassis 01125: serial number 6097 above.

Chassis 01134: serial number 6664 above.

Chassis 01185: serial number 5676 above.

Chassis 01291: Woden date codes: "LT" = November 1962. Hunts cap. "HHH" and "TIH" = 22nd and 43rd weeks of '62 (late May and October). Welwyn ceramic resistor - "TJ" = September 1962.

Chassis 01353: serial number in the 6000s above.

Chassis 01381: serial number 6534 above.

Chassis no. unknown: Woden transformers with "HT" and "JT" codes = August and September 1962; Hunts capacitors with "HHH" = 22nd week of 1962 (late May), and "ITH" = 34th week of 1962 (August). One of the pots has "HJ" = August 1962.

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