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My lovely 465 died immediately after I finished some cosmetic repairs. Low voltage test points all look good. No beam, except when I disconnect the ground lead of the HV multiplier as suggested by VintageTek Museum on youtube (https://www.youtube.com/watch?v=hf1qhx3JNRY). (I also hear some crackling sounds with the multiplier disconnected, so I haven't run it in this state for more than a few seconds.) Could the problem be anything else besides the multiplier? I have a digital scope but no high voltage probe. To measure high voltage DC I have been using a 10MOhm resistor and analog ammeter, but of course that's a significant load. If the problem is the multiplier - part number 152-0552-00 - does anyone know if they're still available? I see that a couple members have built replacements, and I would really appreciate a schematic and/or component values. The location of the multiplier within the scope, and the requirement of potting, will make it difficult to troubleshoot a DIY replacement and I have little high voltage experience. So I'd like to get it in 1 shot.

I the three Tek 453 scopes. Two are MOD703K, one is 703H. I find the docs that show some differences, along with changes. In the family, I find these variants 453 SN < 20,000 453 SN 20,000+ Major change seems to be nuVistors are changed out for FET's 453 MOD703H (see below) 453 MOD703K (see below) 453-A Larger CTR, 60 mHZ 453-A Later SN, many changes 453A-1 Uncalibrated delay of the delayed sweep 453A-2 Calibrated delay time 435A-3 Calibrated sweep delay and mixed sweep 454A-4 Single time base 453A-5 No documentation found, X-Y mode The 453 MOD703K seems to have more in common with the 453A-5. They share most of the same boards, larger CRT. The docs I have show MOD703K includes: 1. SAWTOOTH OUT facility has been added to the rear panel via BNC connector. 2. CH 1 OUT connector has been moved on the front panel, Amplitude is 200 mV for each division of CH 1 deflection, 3. A GATE and B GATE facilities have been added to the rear panel, 4, The Calibrator Current Loop has been added to the front Panel, and the 1 V CAL connector has been moved 5. A TRACE FINDER control has been added to the front panel. 6. The HORIZ DISPLAY switch has an added position providing XY. 7. The light on the RESET control has been deleted. 8. TRIGGERING (DELAYED SWEEP); COUPLING and SOURCE functions, have been added including an EXT TRIG INPUT or EXT HORIZ connector, 9. Special accessories in lieu of standard are provided, See parts list. Mod 703H includes: 1. A SAWTOOTH OUT facility is added with its BNC connector mounted on the side panel. 2. Amplitude of CH 1 OUT signal is increased to 200 mV for each division of vertical deflection. 3. The CRT is replaced with a CRT having a special internal rise~time graticule. 4. Two. probe tip adapters, two banana plug tips, and a 13.5" BNC to BNC 50 Ohm coaxial cable are added to the standard accessories. I have compiled a type study showing the board part number designations that were used in all the variants, compiled from docs and compared to the ones I own. The doc I find for changes to the 703H and 703K shows changes for 703H after serial number 60777. They do not agree with the one I have that is 60794. The board numbers listed for the 703K agree with what I find in the two scopes I have. The 703H has a couple of boards that have 703H silk-screened on them, and there is a small daughter board (670-704-00) attached to the A Sweep board, missing on the 703K's

Hi all. Looks like the HV transformer in my SC502 oscilloscope has decided to die... Does anyone have one of these they can sell to me and send to Japan? The one in my unit has part number 120-1016-00 (looks to be used in the SC504 too?), but any compatible revision of this part would be fine. I have paypal ready to go. :) Thanks!

This may be two (2) silly questions: a) Is there a way to convert the 7a13 mechanical ( "veeder root" type ) display to the LED display ? Did Tektronix provide any field Tech notes for doing such ? Does someone have the schematic & parts list for the LED module ? ( does anyone have that module from a dead 7a13) Could it be transplanted into a 7a13 that has the older mechanical module ? b) I am trying to understand how to use the 7ct1n Curve Tracer in a 7704 with the 7a13. Does anyone have a set of simple notes written up for this ? The 7ct1n manual seems a tad confusing ... thank you, rick

While going through another crate of Tektronix gear I came across this board, which has the legends "GPIB", "TEK T1", and "R-0291-XB". My google fu might be weak but I can't find any hint to the board's use or origin. Anyone recognize it? Here's a link to the photo: https://www.dropbox.com/scl/fi/7g8yxs2uy8vssnegli0ka/K7WXW-GPIB.jpeg?rlkey=q8333no7z0l761n7jpk6kwcht&dl=0 Thanks - Bill

Morning all, I've got about 70 plus Nuvistor tubes that need a new home. These are nearly all NIB NOS. 6CW4's, 6DS4's, 6DV4's, one 13CW4, and about 35 2 volt versions. I've checked all the boxes to be sure that the brand of the tube in the box matches the box. I haven't tested any of these, but this batch of stuff came from a closed electronics distributor in OH. I want to sell the whole lot. I've got pictures of what's there. I wasn't sure that I could post pics here so if you need to see them I can e-mail them to you. I'll sell them here for $65 for the box including the shipping CONUS.. I'll ship them overseas too, but the shipping will be extra. PayPal works. Let me know. Thanks!! -- Kim Herron W8ZV w8zv at goldenradioservice dot com www.goldenradioservice.com

Ray M <raymond.muno@...> added folder */Tek 453 variants*

Here's another kind of XY oscilloscope demo. Very cool! https://www.youtube.com/watch?v=6DifrkaALOg&t=366s

We've added new features and listed another 20 on our eBay store. Information at https://vintagetek.org/vintagetek-demo-board/ Listing at https://www.ebay.com/itm/116579003135 Dave

Hi all Here /g/TekScopes/topic/107425848 H?kan kindly provided the service manual for this signal generator. I had time to have a look inside and found a shorted cap on the -15V supply (C1200 of A13 board), now the power supply seems to behave a bit better (the 3.6 V rail is still off, at 3.3~ ish Volts) According to the manual the oven temp normal light should come on but this never happens (this circuit doesn't seem to use the 3.6V rail so I ignored it for now) The manual says that TP1100 should be around 4.1-4.2 Volts for the "oven temp normal" light to come on but that never happens.. it hovers around 3.5 V and varies a bit. I noticed that R1156 gets really hot (>100 °C) but I don't know if this is a fault or not. I took the oven apart to check the thermal fuse but it seems ok... so I'm not really sure where to go from here. I updated the album: /g/TekScopes/album?id=296482 Can I plug the oven in without enclosure for testing? Disclaimer: I obviously have no idea what I'm doing... there doesn't appear to be any notable occurences of this SG on the net so I will try to find faulty or out of spec parts and hope any of you have a good idea where to start Thanks Luca

Hi, I need manual for a sparameter test set Thanks Regards! /g/TekScopes/photo/272750/3383849?p=Created%2C%2C%2C20%2C2%2C0%2C0

Team, I have over the past few months acquired 5 7844 scopes, none of which worked. Good thing it was just the cost of picking them up. I have repaired 3 of them so far, one of them still has the power supply on the bench, one was the parts source. On the latest project a R7844, after replacing caps in the power supply, replacing beam 1 vertical amp twice, original was very noisy, first replacement gain was very compressed on the positive side. Working very well now, calibration done. Discovered one last problem. Intensified sweep using a 7B92A. Beam 1 works perfectly, beam 2 the delayed intensified sweep is very dim . Intensity control does control it but at max you can just discern on the screen. Reducing the separation until it corresponds with the main trace it works perfectly. Now for the weird part if I use the older 7B92, intensified Alt trace, it works perfectly Thoughts? Mark W7HPW Real Radios Glow in the Dark

Hi folks. I recently purchased a Tek 2247A scope and upon testing it for the first time, it locked up when testing the B sweep with a msg that said 'INVALID INTERRUPT FROM 0993:F082' When I rebooted, the screen has an indecipherable error message that appears to read something along the lines of 'Part Number 100-xxxx-00' with a bunch of exclamation marks. I couldn't clearly read what the part number as it was out of focus and could get it to focus well enough to read the numbers. The 'Auto Level' and 'Auto' LEDs were flashing which indicates both a RAM and ROM problem according to the service manual. The SGL SEQ LED was also flashing but there's nothing in the service manual that mentions that LED, or at least nothing that I've found. I let the scope sit for 10 minutes and it booted back up in service mode and gave a failed battery warning, and ran through self calibration. I left the unit on and it locked up after about 10 minutes with the same error as before. After the reboot I went into the service menu and ran the self test 'until fail' and the test ran for 30 minutes without issue. I also ran through the self calibration once more. It's now been powered on for a few hours without any problems or locking up and all functions 'seem' to be working as expected. Thoughts? Would something like this be caused by a battery issue? That seems like an easy fix but if it's something deeper, I'm not sure if I'd want to chance it. Thanks! Jay

I use Google Translate. I don't have brightness adjustment and the reverse path of the beam is visible on my 2337. The A15 board is defective. A15 Vertical Output / H.V. Power Supply board. When I replace it with a working one from another 2337, everything is OK. Where should I "dig"? Thanks!

Barry Breaux <groupsio@...> added the photo album SC503 and SC504 Volts/Div and Time/Div Knob Shaft ( /g/TekScopes/album?id=302038 ) : If your SC503 or SC504 Volts/Div or Time/Div knob shaft was cracked or broken in shipment you can use these to replace the shaft. --- The following photos have been uploaded to the SC503 and SC504 Volts/Div and Time/Div Knob Shaft ( /g/TekScopes/album?id=302038 ) photo album of the [email protected] group. * IMG_2567.JPG ( /g/TekScopes/photofromactivity?id=3909069 ) *By:* Barry Breaux <groupsio@...> --- The following photos have been uploaded to the SC503 and SC504 Volts/Div and Time/Div Knob Shaft ( /g/TekScopes/album?id=302038 ) photo album of the [email protected] group. * IMG_2570.JPG ( /g/TekScopes/photofromactivity?id=3909070 ) *By:* Barry Breaux <groupsio@...>

Is anyone else having issues with TekWiki today? I attempted to look up an instrument, but received a message stating that a login is required. I don’t have an account, so I can’t access anything past that.

hey folks I plan to open up my Tek T922 scope in the next couple days to hit all the contacts with contact cleaner & reseat the boards & connectors . It looks like 3 screws on top spine & another 3 screws lower spine . Is there any other fiddleing I need to worry about with the front or rear cover ? thanks animal

Anyone have a manual for the 1424? Wiki Down? Sam

2465B s/n 57xxx When I first powered it up, the lights would all come on for a split second, then they would go out, then it would cycle through the self-tests, failing at TEST 05, so I cleaned up the A5 corrosion and replaced a few components there. I also replaced the RIFAs on the power supply. Following that, when I turn it on, the lights all come on, but they don't go out. All J119 points are well within spec. I am a little confused at times when following the service manual, for example the troubleshooting procedure said TP201 should be +10v, but the schematic seems to indicate it should be +5v, which is what I'm getting. I'm not sure how to proceed at this point. I'd like to go as far as possible before I am forced to buy a new oscilloscope to repair this one. Thanks

<https://www.mill-max.com/products/new/zero-profile-press-fit-receptacles> Cheers, David