Below, pictures of an interesting AC80/100 that came to light in 2010: chassis produced by Westrex, green Woden transformers, late 1963 and early 1964 component date codes, but fitted with a grey control panel rather than copper, an Arrow black bat mains switch, and dome voltage selector in early 1966.

In terms of original components, the Dubilier 100uf filter capacitors have date code "UM" = December 1963; smaller Dubilier electrolytics "UK" and "UM" = October and December '63; Welwyn cement resistors (screen and cathode) "VA" = January 1964; Egen potentiometers "AL" = January '64 also.

The red "RTC" filter capacitors in the preamp are certainly old replacements (the date code "DCD" may indicate last quarter of 1964 for their production). Note that serial number 182 also has a red RTC cap. and dome voltage selector.

No serial number plate or warning plaque was ever fitted to this amp. Was it made up as a display/demonstration piece? Only likely perhaps if the box is original to the chassis (which it could be). Or is this simply an instance of a chassis with a damaged or unusable cabinet being reboxed in a thick-edged box and refitted? Thin-edged cabinets are not fantastically sturdy.

The resistor across the speaker terminal - dated December 1965 ("WM") - provides a guide to when the refitting was done.