Enjoying the video. Since those 1 or 2 watt resistors are in a metal can I think they maybe placed in those metal sleeves and then soldered to the chassis for heat dissipation and not for shielding.
Well, you're probably already well ahead of this point but those electrolytic caps are all suspect. Probably haven't been stressed a lot over the years but they still die. I just fixed a old HP 80 MHz counter by replacing the PS electrolytics (Sprague big cap had "wet the bed" requiring a bit of PCB repair, boy are electrolytics expensive today!) but the two smaller Sprague's also need replacing, one obviously bad but the other just starting up the ESR chain). Anyway, worth a quick ESR meter check.
Enjoying the video. Since those 1 or 2 watt resistors are in a metal can I think they maybe placed in those metal sleeves and then soldered to the chassis for heat dissipation and not for shielding.
Yes, I came to the same conclusion
Well, you're probably already well ahead of this point but those electrolytic caps are all suspect. Probably haven't been stressed a lot over the years but they still die. I just fixed a old HP 80 MHz counter by replacing the PS electrolytics (Sprague big cap had "wet the bed" requiring a bit of PCB repair, boy are electrolytics expensive today!) but the two smaller Sprague's also need replacing, one obviously bad but the other just starting up the ESR chain). Anyway, worth a quick ESR meter check.
you can see into the future, not the only thing wrong though
Well, get to it.
We are waiting. : )
That looks horrific to work on. Good luck. :)
The electrolytics are Mallory TT series 85C caps probably near end of life.
Start with the electrolytics,... very often they suck. Do you have an ESR meter?
What is the advantage of 3D soldering all the parts?
it minimized the leakage and crosstalk
At 6:40 in the bottom-right, it looks like 2 diodes there, maybe?
two varactors
@@IMSAIGuy - Close, since I couldn't read them. ;-)
Cool