Had 7000 scoles and pluguns since 1990s, perhaps 4 scopes and 120 PU...
Fast notes:
Attn.contact clean :
Paper: We use business cards and 99% Iso Achol.
Beware some wideband PI like 7A29 use polysolfone substrate attn and need special cleaning precaution
7L5/12/13/18 All the TEK 7K SA have VERY difficult repair and service, and usually dead shaft encoder controls and sometimes burned out atten/mixers. Beware.
The sampling units are hard to use and finicky. Easier to just get a modern digital scope for plots, one shot, averaging.
The curve traced 7CT1 is rare and costly and hard to sue. Avoid unless a junker low cost.
Bon chance
Jon
Froggie the Gremlin