On this page, a selection of photos of inspection tags attached to amplifier chassis by Westrex, one of JMI's principal subcontractors, following testing. The process at Westrex was fairly rigorous. Every solder joint was checked by one of the inspectors (and marked with red dye to indicate that it was good), followed by full electrical testing at power. Tags were added thereafter.

These normally designated the model of amplifier in view (AC10, AC34, AC36), and in the case of AC30s up to late 1963, chassis that had been produced wtih bass voicing. This was so that the team that put the chassis into boxes at Dartford Road could add the correct voicing to the serial number plate ("B" to indicate bass). "Normal" voicing was not designated by Westrex on its tags - ie. if nothing was said about the voicing, the chassis will have been a "Normal".

From 1964, Westrex normally stamped its Treble chassis "Westrex Treble" on the preamp upright beneath the input jacks. Whether "Treble" was also designated on the tag is not known. None has so far come to light for a Treble model.

That Dick Denney favoured Westrex-made chassis has been widely reported over the years. As it turns out, he was far from alone at JMI - and not because Westrex-made amps in some way "sounded better". They were simply manufactured (and checked) more carefully. Rodney Angell, who worked as an amp tester at Dartford Road in the early 1960s, regularly encountered dry solder joints in the amps assembled by Burndept, JMI's other main subcontractor.

TV Front AC30/4 (AC34) - late 1960.

The checker who signed off the amp above evidently also signed off, among many other things presumably, a 40-50 watt cinema amplifier sold under the Westrex name:

Westrex tag in a 40-50 watt cinema amplifier, late 1950s/early 1960s.

Late 1961 / early 1962, AC30/6 Super Twin chassis.

1963, AC10 chassis.

Late 1963 / early 1964, AC30/6 chassis, noted as being a "Bass".

1964, AC30/6 Super Twin chassis.