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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

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

Hi all, I have a Tek 2432 which fails the following; 1: 7000 CCD 2: 8000 PA 3: 9000 TRIGS I also have a Tek 2432A which fails; 1: 5000 WP 2: 8000 PA -- no pass/fail message 3: 9000 TRIGS -- no pass/fail message Is this an almighty going round in circles job or has anyone been through this before? Before you suggest it - the batteries are ok. I may donate these if they require a lot of time to fix to somebody who has the time. Regards Gearoid Loughnane Dublin

My ancient Tektronix 547 oscilloscope with 1A1 plugin was working fine until a few weeks ago when the display suddenly went intermittent and bright, and an arcing sound came from the area of the crt high voltage circuit. No arcing could be seen anywhere, but the sound definitely came from the vicinity of the high voltage assembly. At this point, the Intensity control had no effect, and the intermittent sweeps were very bright. The sweeps only occurred when the arcing sounds were heard. Otherwise, a bright spot stayed on the left side of the display. The focus control also had only a slight effect. Suspecting the flyback transformer T801, I sourced an assembly from another 547 that included the transformer and the voltage multiplier comprised of the 5642 diodes. Symptoms remained the same, unfortunately. Replacing one of the regulator tubes in the 350V supply (6CW5) with a brand new one strangely made the arcing go away, but still no display. In fact, no more intermittent sweeps, only the ultra bright spot at the left hand side of the display. Currently, I have no way of measuring the high voltages from this assembly (10kV), so I’m not sure if they’re within spec. I also changed out the four 0.01uF caps in the Intensity circuit in case they were arcing, but no improvement. Scoping the output of the B Sweep Generator section (at tube V91), there was no sign of a sweep waveform (consistent with the stationary bright dot on the left side of the display). I’ve tested every tube in the scope, except for the 6080s (and checked all transistors for opens or shorts). None gave the impression that they would be show stoppers. I also scoped all B+ and B- rails. All were rock steady except for the +350V line, which had some ripple. Even after changing out the 6CW5, the ripple was still there. It’s obviously generating high voltage as evidenced by the bright spot on the crt. I can’t understand the relationship between the inability to control Intensity and Focus and the lack of a sweep signal. It doesn’t matter whether I’m in A, B or ALT timebases. Could the crt have an internal fault? Any advice or best guesses as to where I should look next would be much appreciated. Thanks in advance.

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

At the museum some of the volunteers would use a curve tracer to try and characterize and isolate faults. One of our volunteers used this concept to develop a low cost versatile debugging aid which we now sell. It is a two channel device that uses a weak signal to display two I-V curves on a windows PC. This allows you to compare various circuit elements and look for anomalies to help isolate an area for further investigation. We call this the Curvebug. Our web page has more information including a 9 minute video and the user manual. https://vintagetek.org/curvebug/ Dave

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

Greetings from Louisiana! I have had several damaged shipments of the SC502, SC503, SC504 scopes. The Slope / Level switch-pot is damaged along with the knob. In a similar way the Volts/Div and Time/Div knobs were broken. In one case the shafts on all 3 knobs were broken. I decided to have shafts built in plastic and 316L Stainless steel. I took the original knob with the printed skirts and drilled out the original shaft and replace with the custom shafts I designed and had manufactured. The plastic shafts are as good as the original, and the 316L stainless steel shafts are far better than the original. I am also working on having the skirts manufactured out of 1/16" acrylic and printed with UV Ink. So now for the question(s)... 1) Does anyone have any SC502, SC503, SC504 knobs with broken shafts that need to be repaired. I can provide the shafts or repair your broken shaft. 2) Does anyone need new skirts for SC502, SC503, SC504. So far I have restored several of these scopes (more than 10). Initially I got plenty of help / suggestions from the group. Many thanks for that. Regards, Barry

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@...>

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.

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.

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!

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