April 17, 2025

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Delivery and Triage
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OS-8B/U US Navy Oscilloscope delivered to front door.
Boxed in re-used box within a series Dollar General polyethelene bags, and then
boxed in another larger re-used box.

Upon opening the box, found OS-8B/U housed in its factory carrying case with 
all latches still functional. Case is visibly aged, faded paint, sticker residue, 
scuffs, scratches, etc. Machine smells of horse barn. Will check for crittera and
contaminates during proper tear down.

Found fuse housings still present. Removed fueses and found one fuse visibly 
failed, see figure_0  and the other is not visibly bad but will be tested, figure_1. 
Suitable replacements must be found, these will be a consumeable item early on.

Back panel with bridged functions? [Check OS-8B/U manual] still present and 
appears functional. Figure_3 shows example of an interesting latched hinge.
Figure_4 shows example of bridges intended connections.

While facing the machine as if you are using it, the right hand side panel
is home to the AC cord. It is located inside a open compartment in the panel.
AC power cord was not unraveled, but there are strong signs of corrosion.
See figure_5.

The top console is home to 4 sets of controls. Horizontal controls and I/O, Vertical
controls and I/O, Sync circuit controls and I/O, and finally Sweep circuit controls.
Figure_6 shows full view of top console. 

If sitting at the machine for operation, the left hand side panel was removed. Upon
inspection there is no PCBs, there is harnessed wiring similar to automotive wiring.
Harnesses do not have polymer conduit but instead have a polymer wire tying the 
wiring together every half inch to inch depending the wire. See figure_8. Solder 
joints are almost entirely exposed in most cases. However on many of the componets
there appears to be some sort of cosmoline, hopefully, protecting these pieces. 
Figure_9 is a good example of this. Hopefully this waxy substance is not leaked
electrolyte from capacitors. Its hard and dry in most spots. Although there is a 
significant shine.

Further in the machine there are some sort of breakout connections I presume.
Figure_10 shows one. Many wires looped or soldered to copper standoffs of some
sort. Other clusters of componets are all over. Figure_11 shows a prime example 
of point-to-point electronics, each componet is soldered directly to each other
and also directly to the board housing the vacuum tube sockets.

The tubes themselves. The fun part. Each tube is installed to its labeled socket on
one of the two boards dedicated to tubes. Each tube is retained with a spring
mechanism that gently pushes the tube towards the socket as shown in figure_12.
When gently and patinetly removed from the machine, a 6AH6 tube is seemingly aged.
The legs are very, mildy bent, there is a dark spot at the top of the tube, and the
silk screen that once proudly displayed Raytheon, is now faded and partially gone. 

The caps. There are caps everywhere in this machine. These will need to be 
diligently tested, reformed, or replaced for this machine to be properly operational.
Many already have visible signs of failure, figure_20 shows one that has corroded to
itself and shows exterior damage to the cap as well. Many are very large and should
be researched in the manual before trying to work with. These are a source of high
voltage even with the machine unplugged. Draining procedures are going to be 
necesary to not get injured. Some have Metalite capacitor written on the side. 
Maybe some research on that capacitor type will be a good start.

CRT condition is currently unknown. There is an old RCA transformer at the base of
the CRT with a part number and diagram on one side. In the same area a blue wire and 
a red wire that each come from the rear bridge panel and are bodged into the back of
one tube board. Each wire has a hand written ID on the frame of the machine seeming
to reperesent the location that the bodge wires sould be located see figure_38.