Tektronix 7613 Analog Storage Oscilloscope

What this is: This is a Tektronix 7613 Analog Oscilloscope. It is a part of the 7000 series family of "mainframes". These are modular scope accepting a wide variety of 7000 series plug-ins. This particular model, the 7613, has a bandwidth of 100MHz. It offers two vertical plug-in bays, and one horizontal plug-in. With two 7A26s or relative equivalent plug-ins, it can achieve the full 100MHz bandwidth with 4 analog channels. The special part about this scope is that it's an analog storage scope. As seen in the first image, with nothing connected, it still has a sine wave saved on the screen. What you'll get: You will receive a Tektronix 7613, one single 7B53A 100MHz timebase plug-in (see important notes about this plug in). You will not receive the 7A26 plug in shown in the photos. That was purely for demonstration purposes. Condition: The Tektronix 7613 Oscilloscope Mainframe itself is fully functional. It is missing the plastic around the intensity knobs, and the bezel for the screen, but fully functional. The -15v supply tends to drop out sometimes, but this is simply a mechanical issue. Q956 isn't super well secured into it's socket, so you may have to bang the back of the scope a few times to get it to work. The reason for this is because the pins of this transistor are thinner than normal. I had replaced Q956 in an earlier repair. The transistor is non-original. The capacitors are old in this unit. Two have already failed by having a much lower capacitance than rated. I rectified this issue by adding new caps in parallel with most of the low voltage rails to compensate for the lost capacitance. The high voltage rail however (+130v), I replaced the capacitor with a good one. No bodging capacitors there. Buying: For now, this unit is for local pickup only. If I were to ship this beast, some delivery worker is likely to drop it and severely damage it. Plus its going to cost a fortune to ship anyways. Since it's a local pick up only, you are more than welcome to haul along some of your own test equipment to test it before finalizing the sale if you'd like.  Important Notes: The 7B53A timebase plug-in is faulty. B sweep is non operational. However, mixed and intensify sweep work, as seen in photos. The delay function has no issues. B triggering also works. The B sweep speed is not adjustable because the pull out knob spins freely, not actuating the rotary drums inside. The timebase triggering becomes finicky at 100MHz, and the waveform becomes a bit fuzzy. Still very readable, but I don't think this is normal... Everything else with the plug in works quite well. Remember that these are all problems with ONLY the plug-in. The actual mainframe is just fine. Questions?: If you still have questions, you can visit a wiki site about these scopes. https://w140.com/tekwiki/wiki/7613 If the website does not have the desired information you are looking for, feel free to contact me. I know this scope quite well so I will be very likely be able to answer your question.