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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…

Yiu On Tony C <tonycheung_hk@...> added the photo album CT71 adaptor ( /g/TekScopes/album?id=300489 ) : Telequipment CT71 adaptor --- The following photos have been uploaded to the CT71 adaptor ( /g/TekScopes/album?id=300489 ) photo album of the [email protected] group. * ct71_vorne_medium.jpg ( /g/TekScopes/photofromactivity?id=3882289 ) * IMG_3590.JPG ( /g/TekScopes/photofromactivity?id=3882290 ) * IMG_3591.JPG ( /g/TekScopes/photofromactivity?id=3882291 ) * IMG_3592.JPG ( /g/TekScopes/photofromactivity?id=3882292 ) * IMG_3593.JPG ( /g/TekScopes/photofromactivity?id=3882293 ) * IMG_3596.JPG ( /g/TekScopes/photofromactivity?id=3882294 ) * IMG_3597.JPG ( /g/TekScopes/photofromactivity?id=3882296 ) * IMG_3598.JPG ( /g/TekScopes/photofromactivity?id=3882297 ) * IMG_3599.JPG ( /g/TekScopes/photofromactivity?id=3882298 ) * IMG_3600.JPG ( /g/TekScopes/photofromactivity?id=3882299 ) *By:* Yiu On Tony C <tonycheung_hk@...>

I've begun to go through the calibration process on the Tek 570 I picked up last summer. It's an early model, S/N 169. It works well but I wanted to give it a once over since I have no idea how long ago it was last calibrated. For some reason the floating supplies, +400v and -300v are both reading high; +446v and -350v The manual says the must be within 5% of the proper voltage, so these are out of spec. Im performing my tests with line voltage set to 117vac per the manual. I confirmed that the transformer is properly wired for 117v. I have the front panel controls set per the manual. I tested the 6ax5 and 6x4 rectifiers, both sections strong on both. The 80uf electrolytics were already replaced with modern parts by the previous owner. Any ideas? You can see in my pic (assuming I can figure out how to attach it) that the secondaries on the transformer are reading a bit high for both sections in question - but not too bad. (the 325-0-325 for the +400v 6ax5 is reading 342-0-342 and the 250-0-250 for the -300v 6x4 is reading 265-0-265) I checked the diagram for the unregulated transformer at VintageTek, p/n 120-0069-00 to confirm that it was indeed made for 117v. Anyways, lowering to 115v doesn't bring it into spec - have to go all the way down below 110v. I plan to start looking downstream and see if something's not pulling enough current, but figured I'd get this post started now. Thanks, Phil

These are equipment accessories for which I no longer have the original test equipment, mostly from Tektronix, with a few from HP or Aglient. Some notes: 1. accessories with the notation "NOS" are unused, still in their original packages, including their probe leads and so on. 2. accessories with the notation "working" have been tested for basic functionality on a 350MHz oscilloscope. 3. accessories without the notation "working" are sold as-is because I don't have a way to currently test them. 4. oscilloscope probes do not come with grounds, probe clips, or other add-ons unless explicitly noted. 5. accessories are all in good mechanical condition. the older stuff has the usual knicks and scratches. 6. prices do not include shipping costs, which I will add to the purchasse price when I have your address. 7. accessories are grouped, with a price for the lot given. Sorry but I am not interested in breaking the lots up. 8. acceptable payment methods are Zelle, check, USPS money order, and (reluctantly) Paypal family and friends. Checks and money orders must clear before shipping. 9. buy two groups and take a ten percent discount 10. buy it all and take a twenty percent discount Shipping will be from Portland, Oregon and limited to domestic buyers. Given the current turmoil in the United States, customs and overseas shipping is a non-starter for now. My contact information is on QRZ.com under my amateur radio call sign, K7WXW: https://www.qrz.com/db/k7wxw Thanks, Bill TEKTRONIX ACCESSORIES price for group: 80 (4) 012-0747-00 and 020-720-00 logic analyzer probe test lead set (NOS) - in original bags with probe adapters, grounds, probe clip (1) 012-0747-00 logic analyzer probe test lead set (1) 020-720-00 probe adapters (NOS) - in original bags price for group: shipping (6) 015-0580-00 pocket signal generator price for group: 50 (1) 012-1372-00 tekprobe interface cable price for group: 50 (1) S-3A sampling head (SN B041187) (2) 012-0130-00 sampling head interface cable price for group: 200 (1) 013-0098-01 transistor curve tracer fixture (3) 013-0124-00 integrated circuit curve tracer fixture (2) 013-0101-00 TO-66 curve tracer fixture price for group: 100 (1) 067-0608-00 overdrive recovery calibration fixture (1) 067-1341-00 risetime limiter (1) 067-0554-00 tunnel diode pulser (1) 067-0562-00 P6046 input adapter (1) 067-0538-00 input RC normalizer (2) 011-0081-00 termination/feedthrough (1) 067-0569-00 sweep attenuator (1) 015-0168-00 displacement transducer (1) 067-0969-00 tape head alignment module price for group: 200 (5) P6122 100MHz probe (working) (2) P6105A 100Mhz probe (working) (2) P6062B 100MHz probe (working) (1) P6109B 100HMz probe, NOS (working) price for group: 180 (4) P6109 150MHz probe, one NOS (working) (2) P6053B 200MHz probe (working) (3) P6106 250MHz probe (working) price for group: 225 (2) P6135A 150MHz differential probe (working, black tip, with ground cable) price for group: 160 (2) P6134 300MHz probe (working) (2) P6134 300MHz probe (working, no probe tip) price for group: 60 (3) 119-1164-00 bias return HP AND AGILENT ACCESSORIES price for group: shipping (1) HP 8495H attenuator (sma, programmable) price for group: shipping (1) Agilent 16752A logic probe cable set (4 pods) price for group: shipping 54003A(2) HP 54003A probe pods

Apologies for the off topic post, but members here are the most likely group on the net to be able to help. I have already tried the B&K IOGroup and B&K themselves with no luck. Does anyone have the boot code disk for the Type 2012 audio Analyser which they could copy and send me? I have cured a hardware fault on my unit, but it now reports it needs a reload of its boot code. Any help would be appreciated and reasonable costs met. Pete G4GJL