2901 TEKTRONIX PDF

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Sharing few shots of this Tek vintage scope calibration tool that just received recently. Did a brief external inspection, it looks fine and well preserved.

Powered up fine too, its just I haven't hook it to the scope to see it's output. Planning to check it's signal and an internal inspection tear down to see what and how it look inside now, wishing no bad surprise, and hopefully I can manage to do it at this weekend, will post the innards photo shoots once its available. This little thing is quite heavy for it's size.

Top front panel view, serial B with few stickers overlapped with years printed on them, calibration date maybe? Front panel, with a date written at yellow sticker, probably that is the last traceable calibration date conducted. The main crystal oven led at the right side was on once its plugged at the mains, even the unit wasn't turned on.

It blinked on and off periodically, looks like its maintaining the oven temperature, measured with kill-a-watt meter, while the unit was off, when that led was on, the oven it self consumes approx. Rear panel, with switch and bnc for external reference clock. Top and bottom view. Front Top View. JPG Front Side. Rear Left. Front Panel. Rear Panel. Nice one! Looks like it's in good cosmetic condition. These things are really handy for calibration of oscilloscope time bases.

I'm surprised there is actually a proper ovenized oscillator in there. I believe this model was between the tubes and TG compact TM module. Appears to share some mechanical parts with the TM series. It will be interesting to see the insides.

Too bad time mark generators are kind of a one trick pony, not much else you can use them for apart from calibrating analog scopes. Quote from: tekfan on November 15, , pm. Quote from: alm on November 15, , pm. I have one of these 's - neat units. Ideal for scope calibration.

One of the cool features is you can press in just about as many of the marker selector switches as you want at the same time - it will output markerss for all of them. How long did you let it warm up? I think Tektronix recommended at least an hour and I seem to recall they also recommend leaving it on all the time if possible. Quote from: elementip on November 17, , pm. The internal photo shots. I leave all pictures at their thumbnail state to save bandwidth when viewing this thread, the file name of the picture should be self explanatory.

Interesting spot : " JPG" shows there are two coils windings but using different materials, wonder why used two different materials for the coils? Top View. Bottom View. Top Board. Bottom Board.

Misc Angle. Analog HF. Precision Resistors. Socketed Transistors. These are more details close up shots at some parts, few interesting spots which are : - " JPG" shows the toaster of this unit, actually the whole unit feels very warm especially at the rear after the unit was turned on just for few minutes. Time to find for an external 10 Mhz maybe? Shiny Coils. JPG" , the silvery wires still so shiny after all this years, are they silver?

Solder flux residue. JPG", the Semtech rectifier is the only semiconductor that is soldered while others like transistors and ics are socketed. Also at the inset, the solder points have the flux residue while others are clean, just curious if its manually replaced? Trim Cap Winged Bug. JPG" , funny looking trim cap, looks like a bug with folded wings.

Golden 2N RCA Transistor. Old School Transistor. Spraque Cap. Bulova Ovenised Crystal. Interesting spot : - " JPG" shows the pcb is still very shiny and almost untarnished at all. Last, wonder what happened to Ray and where is he now? Result 1. Result 2. Ray Wood. Great pictures, thanks! The socketed transistors blew me away. The coils look almost like nickel plating. Silver is a little duller even when it's first applied, and then tarnishes very quickly.

I used to build much larger silver and nickel plated coils for high power RF equipment, so I've seen them both after a few years. What a brilliant piece of kit. I love that PCB, you don't get stuff like that anymore. Hard to believe that people actually bothered to but simple transistors in sockets. Very nice! The OCXO is made by Bulova the famous company that made the wristwatch with the tuning fork oscillator.

Nice old HF design for the MHz multiplier. Looks like Tektronix had a habit of putting as many components in sockets so they can easily be replaced if they should ever fail. Great pictures. I wonder why the sockets for small signal transistors.

Was this a holdover from the tube days which would have to replaced regularly? I remember that some manuals mention that it's not recommended to periodically remove and check semiconductors, suggesting that it is recommended for some equipment. It may also be because they considered semiconductors expensive, just like how people often used sockets for expensive DIP parts.

Not much choice now most expensive parts are BGA, however. I think the sockets cause more issues due to bad connections than they solve by making part replacement easier. I believe the OCXO was not very accurate. A decent modern day XO will have a similar performance, but you don't exactly need 0.

Quote from: codeboy2k on November 21, , am. Quote from: tekfan on November 21, , pm. Quote from: alm on November 21, , pm. I don't see any reason to doubt the accuracy based on your results, but an analog scope isn't exactly a hard test for an OCXO.

My comment was based on the 20ppm accuracy spec after warm-up, which is close to the performance of a normal XO. I have one of these too! Thought I was the only one still hanging on to one.

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