Some notes from my repairs;
Some of the metal film resistors used in the voltage divider/feedback circuits in the PSU and the horizontal amplifier can drift high in value, or go open.
The 4-071 transistors used in the older scopes do go bad occasionally, sometimes they also fail intermittently & drive me up the wall, trying to figure out which is to blame.
Double check the plug-in connector pitch against the Tek scopes you referred to, they are a different pitch as far as I know, the HP scopes used the Amphenol Blue Ribbon or McMurdo Red Range with barrier polarization, Tek used dowel pins for polarization, buying the wrong type for extender cables could be an expensive mistake.
There was a warning of PSU over-voltage faults causing damage to some plug-ins, testing & repairing the PSU without the plug-ins installed is recommended.
The dates for the storage scopes need checking, the 141A (round CRT) is first seen in the 1966/67 catalog, the 181A doesn't appear until the 1968 catalog.
The 141T mainframe you have is a late one, with the oscilloscope beam finder switch & calibrator removed, intended for the spectrum analyzer plug-ins..
Something should be added to inform of how easy it is to damage the storage CRTs in the 141 & 181 series as explained here;
The newer timebase plug-ins such as the 1825A, can suffer from the plastic edge of the rotary switches cutting through the PCB traces, I've seen this in other scopes, such as a 1715A.
The 182A doesn't have the internal flood gun in the CRT, it uses external lamps for illumination, later 182C & 182T use a CRT with the flood gun, it's slightly longer as a result.
David
factory