Clik here to view.
Tektronix 549 Analogue Storage Oscilloscope, part 1
I’ve recently been bringing this beautiful old scope back to life. It’s one of the last models in Tektronix’s legendary 500 series of oscilloscopes, which were in production from the 1950s until the...
View ArticleClik here to view.
Tektronix 549 Storage Oscilloscope, part 2
In part 1, I established that this scope was just about working but there was some problem with the high-voltage (EHT) power supply to the tube which was making the trace very dim. The transformer in...
View ArticleClik here to view.
Tektronix 549 Storage Oscilloscope, part 3
In part 2 I established that there was something wrong with one of the windings on the replacement EHT transformer, so the grid voltage was either too low, leading to a very dim trace, or too high,...
View ArticleClik here to view.
Tektronix 549 Storage Oscilloscope, part 4
In part 3, the scope was working, with a trace that seemed to do the right things. But the delayed timebase was dead. It’s a handy feature that effectively lets you select a part of the waveform on the...
View ArticleClik here to view.
Tektronix 549 Storage Oscilloscope, part 5
In part 4, we’d got the delayed timebase working thanks to swapping out a pair of 6AU6 valves. But there was still something not working, and it was all my fault. I’d killed the ‘enhance’ feature. The...
View ArticleClik here to view.
Tektronix 549 Storage Oscilloscope, part 6
In part 5 I repaired the damage I’d done to the ‘enhance’ feature. The ‘locate’ button was the next problem to solve. It was really sensitive and tended to get stuck in the pressed position. Its job is...
View Article