A few weeks ago I scored some vintage HP test equipment. This past weekend was Tektronix. A 575 curve tracer and 547 oscilloscope, both with carts! Both needed a lot of cleaning, inside and out. I took all the knobs off, cleaned them with a brush, cleaned every tube individually, cleaned the sockets, cleaned and lubricated the fans, cleaned all the switches and pots, and did some minor adjustments on the 547 for DC balance. The 547 is awesome, I've been wanting a 500 series scope for a long time, but the shipping made them unrealistic for me to buy. This one appears to be sharper than my Tek 2445 and 475A!!! I absolutely love it. I have a few cabinet parts on their way from Austria to complete the units.