Tektronix WFM90 scope

[kf4rca]

Our station had one, along with the TSG-90/95. The problem with these is that often they sit on charge for long periods of time and the batteries start to leak. You might can clean it up but if the leakage gets on the circuit boards it becomes more difficult.
What I discovered also is that parts are un-obtanium. We had a Tek 1735 waveform monitor that somehow blew an opamp. It was an exotic gold SMT style op amp that was no longer available. (Maybe, these days there is a fix available.)
I bought a TSG170a bar generator off Ebay for a dollar non-working. It's a full 1RU high. Our station had one of these and I liked it. When it arrived I could hear something rattling inside. I opened it up and it turned out to be the 120/240 jumper had fallen off the pins on the power supply board. An easy fix!