QuoteDace needs to set up an amateur radio sub-forum here. This group has a lot of hams and is a more polite place than QRZ.
+1
WA6TKD
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QuoteDace needs to set up an amateur radio sub-forum here. This group has a lot of hams and is a more polite place than QRZ.
+1
WA6TKD
+2
+2
+1
Systron Donner 6053, a 3GHz Nixie Counter...
Restoration starts
thank you.
This very glowing apparatus is only 60 years old and works very accurate,
means that is good for along time again
Every time I look at this thread I start drooling because my mouth is wide open in amazement.
I love the smell of hot vacuum tubes in the morning.
Great work Martin, I have lots of vintage test gear but never found a classic 500 series scope. It's one of my wishes to find one.
I love my old Tek RM503 "precision low-frequency oscilloscope".
This scope has an interesting history. It was bought at a surplus auction from a NASA Ames laboratory 20 or so years ago. I cleaned and restored it internally and calibrated it, left it on overnight to "burn in" and in the morning found that it had failed, no trace and was blowing the mains fuse. I did a lot of troubleshooting over the next several years here and there, and eventually found that the CRT filament supply winding, which is raised to -2kV or so by the HV circuit, was shorting to the primary winding inside the big main power supply transformer. Obviously this wasn't going to be replaced... so what to do. I finally figured out that I could simply provide a separate transformer for the CRT filament circuit altogether. Once I figured out the fix, the hardest part was finding room inside the chassis for the new filament transformer. Now the scope works perfectly again. I love the blue persistent phosphor and the orange-red graticule.