Fixed: TE-20 Signal Generator
This was a quick one. Only the lower bands were working and there was no modulation at all.
One band was taken out by a broken solder spot, the other upper two bands came back to life after reseating the 12BH7.
Modulation wasn't even working when being fed an external audio signal. Following the signal path revealed a short to ground. A capacitor leg was bend towards a solder spot and made contact. The internal audio oscillator only came back after fiddling with the capacitor on the right side of the Colpitts topology. Maybe it has an intermittent fault. Will get replaced, as will the filter electrolytics.
This was a quick one. Only the lower bands were working and there was no modulation at all.
One band was taken out by a broken solder spot, the other upper two bands came back to life after reseating the 12BH7.
Modulation wasn't even working when being fed an external audio signal. Following the signal path revealed a short to ground. A capacitor leg was bend towards a solder spot and made contact. The internal audio oscillator only came back after fiddling with the capacitor on the right side of the Colpitts topology. Maybe it has an intermittent fault. Will get replaced, as will the filter electrolytics.
Bun's Lab
It is here. HP1650B logic analyzer.
So sadly, I do not have the cables or probes/pods for it. And you cannot just buy those. Ebay sellers are asking absolute moon prices. The previous owner, Rik, tried to make his own using ribbon cables and little PCBs with termination resistors. But, he says, that didn't work so great. So this is something I gotta look into. Either source the original cables and pods, or make my own.