Bush Manufacturing dates

[Old Sparky]

I am in the process of repairing/restoring a DAC90A, which has the dark color dial scale.  It's serial no. is 73/204886.  The Celestion Speaker is marked 'K5QO 1734', and two stamps on the speaker metalwork  read '180'.  Cabinet is the Dark Brown version.  From the foregoing, can anyone say when this particular 90A was made, please?  The manufacturing date on the original Reservoir/Smoothing Cap. Can is partly obscured by it's fixing clamp, so I can establish that if/when I remove the can (I usually replace these, b.t.w.).

[Terry]

If you are going to reveal the date on the cap, I'd go with that - it probably only preceeds the date of manufacture by a small amount.

Another source of useful information is the date code on any original valves - it's unlikely that many will have been replaced.

If you are not familiar with decoding these, this is a useful resource:

https://frank.pocnet.net/other/Philips/P...ListAB.pdf