Okay well I just got my hands on a Hp 200c from the dawn of the 50s! My goal is to restore it in to working condition again. So far I have replaced the power cord, fuse and have used a variac to slowly power it back up. All of the tubes are warm when on and the correct heater voltage is being applied from the transformer. (6.3v) I have not been able to use contact cleaner on the switches or controls yet. For a brief period of time I was able to hear it work when hooked to the stereo. It didn't sound too good though so I connected to the oscilloscope and saw the problem. The waves were faint and not fully oscillating. (Maybe a bad output cap?) Sketch is included below. Shortly after though the oscillator stopped producing a signal and hasn't produced one again.
I am still very new to vintage electronics and I think that working with something like this would be a good start to get to know them. If you have any ideas or suggestions to help me out on fixing this I would appreciate it.
Manual --> http://www.hparchive.com/Manuals/HP-200C-Manual-sn-50000.pdf
I am still very new to vintage electronics and I think that working with something like this would be a good start to get to know them. If you have any ideas or suggestions to help me out on fixing this I would appreciate it.
Manual --> http://www.hparchive.com/Manuals/HP-200C-Manual-sn-50000.pdf