Hello.
I got a Tek 465 scope from ebay and I was surprised to see that it worked with no problems. Perfect cosmetic condition, came with original service manual, pouch and a blue screen (I don't know what that's used for, there's already a clear one installed, and a metal mesh in front of that).
After a few tests it was clear that I need to recalibrate it.
Calibration signal was about 270mV with 960hz. I could get it to 300mV but there's nothing on frequency adjustment in the manual. If anyone knows how that's done...
Voltages are very close to spec:
5v - 35mV ripple
55.74V - 47mv ripple
15V - 29mv ripple
-8V - 10mv ripple
112V - 30mv ripple.
This is my first scope (somehow, as I just got a digital one as well so it's a first for me anyway).
I followed the calibration procedure about 4 times until I understood what was happening, and I got everything right. I don't have a function generator so I used the 1khz signal from the digital scope, I had another 4mhz tcxo and 16mhz from arduino crystal
I only used the 16mhz sine wave for trigger calibration as that's not that reliable. 1khz and 4mhz generators are spot on with digital scope and dmm.
The problems that I have are with the horizontal part of the oscilloscope.
First the horizontal line goes beyond the visible area of the CRT. I can adjust the horizontal knob and get more of signal both ends. The trace also fades away in a fuzzy way instead of a sharp dead stop (only for sine waves, for rectangular it ends nice). If I increase the brightness then I get even more trace at both ends. At maximum crt intensity I get really fuzzy endings on the trace.
On faster time sweeps (faster than 5us) I get a dimmed portion of the display that moves with the horizontal knob, it's signal dependent, doesn't seem to be from the crt itself. The "faded" part of the signal moves with changing the knob, with signal and with gnd couple on either channel.
Also when I gnd couple both channels (on slower sweep speeds) the line is nice and sharp but it has a "belly" in the center part, oriented upwards, and is about a micro division on horizontal. If I move the line to the upper part the shape inverts, with the "belly" downwards. On the left side the trace tends to distort more on the extremes. I couldn't test the HV as I don't have proper probes but I did adjust the CRT bias as per instructions.
Any ideas?