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Welcome Old Guy this a great rack wow Nice to see someone still preserve these gems...I recently had the HP 204 oscillator act up. It's only about 40 years old. Power supply caps were the only problem. It was fun to work on because of the construction quality. Great engineering. 90% of my test gear is 30-40 years old. Just the other day I fired up (actually walked it up slow with a variac) my Tek 503 scope for the first time in 10 years. The trace on it is still razor thin. It beats the pants off of the Rigol 4 channel DSO I bought for $350. I sent the first one back because the trace was so fat. I'm used to looking at little noise and stuff riding on waveforms and it doesn't show up on the DSO. However for capturing waveforms the DSO works great. I attached a captured image of the inrush current to an amplifier at turn on taken by the DSO.