Hi & thanks !
Amassing would be the correct term since I started as a teenager circa 1975. Many of these instrument were bought cheap in surplus or gracefully given to me "to get rid of the obsolete and save space"...
Let's do a quick inventory of the visible :
Picture 1 :
Top left : tube audio generator (green and big), tube signal-tracer (DIY)
Mid left : scope under audio generator, CD player under FM stereo generator.
Low left : tube scope, signal generator AM/FM, tube signal generator.
On table : Ampeg SVT under test with BiasTest amp analyser (DIY) and Fluke DMMs.
center mid : 2 tube-regulated HV PSU (DIY), Grundig AM/FM tube receiver.
Picture 2 and 3 :
Impedance bridges, audio generators, transistors and tube testers, Variac...
I have some useful advantages : there's an access to the outside for loading / unloading big and/or heavy gear (see below), and it is a dedicated local, just for me.


Nonetheless there is some drawbacks : I lack space for storage of amps awaiting service, the workbench table is too small, I live with the boiler so it means that in summer I am in a sauna.
A+!