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I was going to attach screenshots from my 11801/SD-32 comparing one of Leo Bodnar's new LBE-1322 pulsers to the calibrator in the 11801. Seems I'm not allowed to do that. Don't know why or care. I'll simply state the result. My 11801 calibrator output has a 15 ps rise time averaged over >4096 measurements. I measured 19 ps for my LBE-1322. The calibrator signal proves that the head is faster than the DUT. If you have an 11801 family instrument which either has a failed or the slow revised model calibrator, this is a superb instrument. You want it! Have Fun! Reg

Anyone know if there is an equivalent for this Tek part number, listed in the TG501 parts as 'Hot Carrier, 4V' ? It's used as a frequency multiplier to generate the 1nS markers from the 2nS signal. My TG501 has working markers down to 2nS but no signal on the 1nS output, so it would appear the diode is faulty.

Greetings, What would cause this? Thank you! /g/TekScopes/photo/300558/3883505?p=Created%2C%2C%2C20%2C2%2C0%2C0

All are used. Some work, some need work, not checked in several years. Item US$ 067-0885-00 50 MHz + 30 dbm source to drive microwave comb generator,etc SN b010367 $50 7a11 Amplifier SN B082381 $40 7a11 amplifier SN b040484 $40 7a13 differential comparator SN B243884 $25 7a13 differential comparator SN B225690 $35 7a17 amplifier with the Proto board area as designrf by Tek SN B041317 $40 7A18 dual Trace base SN B118843 $20 7a18 dual Trace amplifier SN b160649 $15 7a18 dual Trace amplifier SN b110715 $25 7a18a Dual Trace amplifier Option 6 SN B011943 $30 7a21n direct access module SN b020429 $50 7a26 dual Trace amplifier SN b191049 $15 7A29 1GHz amplifier SN 100129 Guernsey UK $90 7b50a Time base B052778 $25 7b53a Dual time base B243371 $30 7b70 time base SN b152520 $30 7b70 Time base B226240 DPO-b041208 $30 7b85 delaying time base SN b088272 $20 7B92 dual time base SN b041907 $40 7d11 digital delay SN b113139 $49 7d13 digital multimeter SN b051601 other has four pin probe Lemo Jack $30 7K11 broadband .89 GHz preamplifier 30 to 890 MHz SN b030653 $80 7m13 read out unit no SN tag $95 7S11 sampling unit SN b149244 $40 7S11 sampling unit SN b124351 $40 7S11 sampling unit SN b135366 $50 7S11 sampling unit SN b148430 $65 S-3a sampling head SN B074046 with cable and probe, DL502 digital latch SN b010148 7T11 sampling sweep unit SN B201915 $150 7T11 sampling sweep unit SN B212039 $125 WR501 word recognizer delay module SN b021094 $95 Shipping $15 per plugin to USA zipcodes. Items ship from Allen, TX USA PayPal or Zelle for payment Shipping to Canada OK at cost if you contact Canadian Customs for import documentation and process it. For other international inquire by PM offlist. All items, as-is. Many were purchased as working, some in need of the proverbial knobs. INQUIRIES by P.M. offlist, photos available. Thanks, Ron

Greetings! I am working on restoring an SC504. It is cosmetically perfect, but has other issues. Channel selection is not working. Channel 2 is always selected. The vertical positioning is also not working. I have experienced different symptoms over the last few days. Channel 1 would move both traces while Channel 2 functioned properly. At this moment Channel 2 is displayed regardless of the channel selector. Channel 1 is not displaying at all. Any ideas?

Hello everyone, UK user here. I have two 465 vintage scopes which need a new home. One, I think, needs calibration and the other does'nt work but maybe good for parts. Free to a good home. Thanks for reading and email me if interested.

I know this is not the natural place for this request, but perhaps there are like minded people here? Does anybody here have a copy of the boot code disk for the B&K 2012 analyser? My unit has lost its memory after some years in storage. The hardware is in good shape. Any help would be appreciated. Please contact me off list Pete G4GJL

Somewhere I recall seeing saw a list of recommended replacement capacitors for the power supplies in 49x-series analyzers, but have been unable to locate it. Does anyone happen to have a copy? My so recently acquired a non-working 494AP that appears to have power supply issues. Bruce, KG6OJI

Hello Bruce, The option 9 increases the low frequency display range down to 1 KHz by replacing the included standard cable with a special one, Tektronix part number 174-1338-000. Rubens, [NoCallSign]

After solving the children's diseases on my tektronix, struggling with the proper electrolytes in the low voltage line, and of course with a lot of help from the people on this forum - the thing worked. Of course, like everyone who comes here, I've read a lot of texts about the problematic transistor that has a 100% failure rate. According to the advice available I replaced these transistors, and I noticed that the trigger is no longer as good and stable as before. Then I started reading texts about the SKA6516 transistor, wanting to find its characteristics. In the book Semiconductors-catalog-1982 I found that it is a transistor A5T3571 which has the following characteristics: Ft min - 1,2 GHz Vce / Ice - 6/5 Hfe min - 100 Vceo - 30V Vcbo - 40 V Vebo - 3 V Icbo - 10nA Ccb - 1,5 pF Vce(sat) - 300/20 mV/mA Ic max - 50 mA I've also read on the forums that people have swapped them with 2N2369 even 2N2222. Most often, the advice was to replace it with KSP10BU, which is relatively easily available today. I was also advised to try replacing them with BF199 which was used in CRT TVs and is also still relatively easy to obtain. I grabbed my box from the CRT TV days, and found a bunch of BF199, BF198, BF311. Then I got hold of that famous Chinese tester and I was amazed - absolutely everything and one on the tester was declared defective, and it shows c-e leakage as an additional diode. Also, the identical behavior as with Tektronix transistors can be observed, depending on the direction in which you put it in the tester, one way it will show that it is a PNP, if you turn it the other way around it will show that it is an NPN transistor. And this is where my doubt begins – 1. how is it possible that absolutely the entire stock high frequency transistors I have is defective, and that not a single one is good? 2. why did tektronix decide to hire semiconductor manufacturers to make such a transistor with custom characteristics, when at that time all of transistors what is listed as replacement today, was available at the time of manufacture of the oscilloscope? 3. Is it possible that these Chinese testers cannot handle the characteristics of these transistors, so they declare them defective? 4. why didn't I know or feel the need to open my tektronix until one of the big electrolytes failed and the device stopped working because of it, and most likely these transistors were in the same state the whole time? 5. if those transistors are so bad, why does my oscilloscope work at all when they are in there? 6. I put the original tektronix transistors back on the trigger board (luckily I didn't throw them away), and why does the trigger work better now? 7. Why does it say - selected from stock, in some places next to these transistors in the manual. Does that mean that in addition to being custom-made, they also paired them? What are your thoughts on these issues?

I have a 7603 that I'm trying to do basic check-out on. But I only have one 7000-series plugin (a 7A17). The 7A17 can operate in either vertical or horizontal slots, but the 7603 does not produce a trace at all without a horizontal plugin (the manual confirms this is the case, but doesn't say why). So I have confirmed that the horizontal works, but cannot test the vertical. Questions: Why is the trace disabled without a horizontal plugin? A vertical is not required... Can I temporarily "hot wire" the horizontal slot, so that I can test the vertical slots with my 7A17 ? Looking at the schematic, it's not clear which pins are involved in disabling the trace when the plugin is missing. Thanks! Pete

Note to group, my 2465B scope had cracked rear tan plastic cover. JB Weld "Plastic Bonder" tan color is a 2 part polyurethane adhesive with a great color match and adhesion. Should work other models I would think. I uploaded photo to Photos folder. /g/TekScopes/album?id=300551

Good evening Guys, I released the new edition of my book about the 7000 Series, more than 800 pages completely rewritten. It is still free and available from my web page (www.k100.biz). Enjoy! Gianni Here is also a small video to present the new book published by Elektor about Tek restoration https://youtu.be/rOYQqtoGnns

My son has acquired a 494AP marked to have Option 9. This option does not seem to appear in available manuals. Have others encountered this option? Bruce, KG6OJI

Hello, I am looking for the TO-66/TO-3 combination test fixture for the Telequipment CT-71 Semiconductor Curve Tracer. If I can't find one I would also like to have internal and external pictures of one so I can make one. The pictures I have found on-line are inadequate and the schematic in the manual does not show either of the two fixtures that came with the unit. I do have the TO-5 fixture and note that there are componets under the bottom cover of the fixure so I suspect tha the TO-66/TO-3 fixture may be similar. The Tek part number for the fixture is: 013-0119-00 Thank you very much, Sam W3OHM

I have inherited both a Tek 464 scope and a Tek 485 storage scope. I've been using Teks since 1966. I'm looking for the plastic covers for the front panels of both. Both came to me without probes. Does anyone manufacture new probes that are equivalent to the originals? I do not know the number for the 464 cover. Can anyone help? I know the part number of the 485 cover is 200-1251-00. I'm also looking for the feet for the 485. The number may be 200-1269 (and an unknown suffix). I'm not a purist, just looking for functionality. 3D printed feet would be fine as long as they were equivalent and sturdy. Thanks in advance. Mike Morris WA6ILQ

Richard Kelly <richardjkelly@...> added the photo album S-30 Inductance Standardiser ( /g/TekScopes/album?id=300542 ) : A home brew inductance standardiser for calibration of the 300?H inductor in the S-30, assuming that the associated Type 130 L-C Meter is accurately set to 140kHz on the fixed oscillator. --- Richard Kelly <richardjkelly@...> updated the photo album S-30 Inductance Standardiser ( /g/TekScopes/album?id=300542 ) : A home brew inductance standardiser for calibration of the 300?H inductor in the S-30, assuming that the associated Type 130 L-C Meter is accurately set to 140kHz on the fixed oscillator. The contained 4310pF precision cap will resonate with the 300?H in the S-30 and null the 130 on 300?H scale.

Happy New Year everyone! I have a 7904 s/n 215841. I got it at an auction in the UK where I live, where there don't seem to be many of this series available, and it was FILTHY when I picked it up. Knowing the tantalum issue I immediately replaced as many of the PSU tants as I could get at without dismantling the unit completely, and removed as much of the grime as I could which was like oily black soot and covered all the circuit boards - got a surprise when I discovered that the HV line was bright pink! Now it works, the PSU comes on and the voltages are within spec, screen is bright (albeit not a patch on my old 545 - is this normal?). The issue is that almost immediately there is a slight ticking noise inside the PSU. It starts as a fairly regular tick (every second or two) but after ten or twenty minutes has become more of a quiet crackling noise. This is far lower in volume than eg. a start up tick. There was no visible light from arcing when looking in a darkened room but I didn't want to stick my face too close, also there is no discernable burning smell. After the crackling develops the voltages remain steady, the screen doesn't change. I dug into the PSU, lord what a job, to look for anything I could find but apart from plenty of grime didn't find any tell-tale carbon arcs or blackened components. I had a look inside the cap multiplier but, again, no obvious arcs. The neon that is on the inverter board had stopped working so I replaced that, changed out the 470 Ohm sense resistors R1429 and 1439 which were burnt but still near-ish to spec, reassembled, and tried again, more in hope than expectation. No change. My questions are: 1. Can anyone point me at the likely source of the crackling? I am fearing it might be the transformer futzing out, but have no idea, after pulling the PSU apart, how I could test it reliably (and safely). If you think it is that, can it be rewound? I can't do this sadly, but I do know a couple of professional trafo winders. If the symptoms scream "cap multiplier" at you I do have a used spare that is labelled good, bought from Sphere's old stocks but, before replacing it haphazardly, I wanted to ask those with more experience than me how to proceed. That's all of you I suspect... 2. The service manual suggests testing impedances on the LV regulator board test points with the power wiring looms connected and disconnected , however their advice is to investigate if the measurements are "significantly lower". But these are for s/n 260000 and up. My PSU is not much different to the circuits in the Tabalabs .pdf. However, my measurements differ from the specs given in table 4-3 as follows: +50V TP with wiring loom connected - spec 3.4k Ohm, measured 2.95 kOhm. Is this significantly lower? Disconnected, the regulator resistance rises to 23.6 kOhm. -50V TP with wiring loom connected - spec 270 Ohm, measured 3.74kOhm. Disconnected, the resistance is 4.34 kOhm. This appears significantly higher but is it an issue. Thoughts? 3. The manual suggests testing the Pre-reg power supply across R1287. The waveform is more or less like that illustrated in 4-4 (A) showing correct operation. Looking at the burst voltages at the test points given in table 4-4 there are stable voltages with little evidence of bursts, and they come at 25 kHz rather than 100 Hz intervals, I assume this is normal? 4. The new neon bulb on the inverter board is supposed to blink to indicate charge on the reservoir caps. Mine flickers dimly and continuously. Is this normal or does it indicate something wrong? Any and all help, advice, and pointers gratefully received.

Hi All, Does anyone have a copy of the Tektronix Adjustment software the for 2780 Series Spectrum Analyzers? I would be eternally grateful for a copy!!! Thanks, Dan __________________________________________________ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com

Hey folks, now I'm dealing with a 184 Time Mark Gen, I've had it for many years. Now it seems to have developed a signal super-imposed on the 10MHz oscillator. The 0.1uS push-button pips are the right frequency, at 10MHz, but they go up and down like keys on a piano. (Tough describing) I can slow the trace down on my scope and see similar pips at, or about 1 to 2kc while still buttoned at 0.1uS. It looks like all the divider stages are working (more or less) at putting the right marks out, to the point of putting our pips around 1 to 2kc. I believe the issue starts in the main 10MHz ovenized oscillator. The rest of the stages are doing their jobs, as best they can anyway, at slower speeds things get messy. The 10MHz oscillator is... interesting. The circuit is pretty straight forward and the device as a whole is very interesting. But what would you suppose would introduce such a slower oscillation into the main oscillator? Is it wise to post a few seconds of video here? The clips are about 9mb…