Tektronix 475-dm44 200mhz 2 Channel Oscilloscope

US $1100

Milligan College, Tennessee, United States
Jun 2nd

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This Scope 475 DM44 ( Late Serial # above 250000) has been inspected for cold solder joints , damaged, out of spec, or missing components, etc. (replaced where required) The DM44 section has been has been tested and adjusted as well,( Tektronix Calibration procedure) with the exception of the "Temperature " bit ( I do not have a probe) All internal power supplies have been checked and adjusted for both voltage and ripple as per manual.( caps \ components replaced when required to make spec, see pictures) Both channels Volts \ Division have been calibrated 2mv>5v per division. "CAIG" Deoxit Gold 100% has been applied ( very expensive stuff ) to the Volts \ Division and DC-GND-AC switches. Both Channels have been adjusted (per Tektronix Spec) for "low" and "High" Frequency compensation, in addition to being checked with and "tweaked"with a "Tunnel Diode Pulser".For those who think that this is "easy" keep in mind that there are about 40 some odd adjustments just for the two vertical channels..and they all interact...enough to make one crazy. Included with this scope is as follows: 1. Full Tektronix Maintenance Manual CD, Operators Manual with the missing pages, pictures diagrams waveforms and complete schematics. Also included the "Tektronix Repair Manual"and the DM44 operators and service.( Note there are some mistakes in the manuals) 2. 1- New x1 x10 100Mhz Probe 1 New x1 x10 200Mhz probe 3. A 42" calibration RG 58AU 50 Ohm cable ( as per Tektronix requirement) with NOS Kings BNC connectors ..The one that was used to adjust this scope, less the 50 Ohm 1GHz load, and "AMP" Tee's. 4. One set of "Custom Machined Tektronix replacement Cord-Wrap \ Feet " (see pic's) 5. This Scope has been run and cycled on my bench for weeks ( see pic's) I compare waveforms, levels, and functions against my other equipment. After this "run in" I then check all functions and ( always do some repair work) then perform the "adjustment"( Performance Cal Tektronix Spec's) process. I then close up the scope( install cover) and run it again, performing final testing before listing. I do my best to insure that these units are working and are without problems. 6. Note: To obtain the waveforms and adjustments, A 42" RG 58AU 50 Ohm cable terminated into a 50 Ohm 1GHz BNC load, or a Tektronix 6106A 250Mhz x10 probe were used. 7. If for some reason the scope arrives "DOA" ( being mishandled or dropped) I will issue a refund. ( buyer pays return shipping) Contact me with any questions or problems as it could be something simple. These units 465B's 475's (a) use sockets for some or all of the "IC's and Xstr's" and can be "jarred loose " in the case of mishandled 8. This is the actual scope that you will receive. The photos ( I have more if you want, I can only post 12) of "Data"and "Repairs" are of the listed unit ..I did not "spray paint" the case as it has only very minor scratches. If you want to ...The paint you want... "Krylon Color Master" spray makes a pretty close match to the Tektronix blue... "Bahama Sea (Gloss) " is what I use Note : Don't spray the front or rear edges of the case, leave bare metal, (needed to make a good case ground connection). Thanks for looking ...Regards Fred