https://boston.craigslist.org/nwb/ele/d/nashua-tektronix-543-oscilloscope/7084582967.htmlhttps://boston.craigslist.org/nwb/ele/d/nashua-tektronix-543-oscilloscope/7084582967.html I have no affiliation

A success story! About 3 years ago I saved a 2221A from the dumpster, it had been out of service for over a decade after failing calibration. Brought it home and fired it up. It worked really well as

7B50 primarily working. there is a problem with the readout at sweeps 5uS and faster, reads 1000x faster that is 5uS reads as 5nS amnd 50nS reads as 50pS. 7B50a again primarily working, the display mo

I found this ad on CL. the parts are located near Albany NY. https://nwct.craigslist.org/ele/d/troy-vintage-tektronix-test-equipment/6973803052.html

All Found this offer for a 556 on CL for $100. It is in the Boston area. https://nh.craigslist.org/ele/d/salem-tektronix-556-oscilloscope/6959447984.html I have no knowledge of this person Ron

Dennis I should have been more precise, I didn't mean to imply that the 7A26 had differential inputs but that the internal signal path was differential. If you look at the block diagram in section 7 o

although I have no specific knowledge of the 7A26, in differential amplifiers if one side is dead then the gain is exactly 1/2 what it should be.