This has to be the oldest Solartron I've seen so far: https://www.ebay.co.uk/itm/334232124623
Hmmmmm... I do believe I see 3DP spacers made to refit that with modern output terminals and color coding. While I personally couldn't care less, it does set off the ol' anachronism detector something fierce...
Another thought... do we really know if that was even made by the same Solartron we know & love for their "special" connectors...?
mnem
no for me...
Yes. https://www.radiomuseum.org/dsp_hersteller_detail.cfm?company_id=8231
Looks to be a newer version of the SRS153 here;
https://www.vintage-radio.net/forum/showthread.php?t=160377
The terminals might be replacements but I doubt the spacers are 3DP, but they are fairly old too, probably the sort RS components used to sell.
Note: these are unregulated PSU's.
David
When you've made a bunch of little bits & bobs like these spacers, you get a pretty good feel for what the finished surface looks like and how light bounces off it, or doesn't. I'll admit the pics are just too rubbish to be sure; but my gut reaction, especially looking at these two pics, is 3DP spacers made to use up some old terminals somebody had in the parts drawer.
mnem
Those spacers are more likely to have been machined from nylon rod, wouldn't have taken that long to do.
The reason they had to do that was due to the larger holes left from the Belling & Lee terminals that were originally fitted, whoever did this wanted to use 4mm plugs and only had those smaller replacements.
Seems the "no power supply for it" as they call it is due to the old Bulgin mains connector, I'm guessing the power lead was either missing, or the seller decided it looked unsafe.
Even the RS catalog from 1984 states certain types of both sizes of Bulgin connector, with the cover that can be removed without tools, are only rated for 50V unless inaccessible.
If only those sellers on ePay knew this, selling those connectors at silly prices for old amps and other equipment.
David