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Sure enough, each edge connector is a small card with some components. What a story! See above. And, Michael H. sent me the following information: The 7S14 was originally designed as 5S14 and because of the fact that the plugins for the 7k Series are longer, TEK Integrated it in a 7k Scopes housing and added some adapter prints to make it 7k scope compatible. This plgin was the "poor peoples" Sampler especially for the Lower Bandwith 100 and 200 MHz Mainframes. Take care with this plugin: it contains little battery cells in the sampling stage that may be empty. This is actually the only plugin that i know that contains 5k Series Technology (and i own quite a complete collection). The 7k Scopes interface differs mechanically and electrically a lot from the 5k scopes. the 5k scopes actually use a mechanics that is mechanically identical to the TM 500 System.

When I recently joined this group, I read alot of the old posts. I saw in one the mention that Freon-TF, used to clean fans, wasn't available anymore. Where I work, they use something called "Freon TF" to clean sensors on check-sorting equipment. The product says that "Freon is a trademark of DuPont ... Contents: Trichlorotrifluoroethane". Is this the same stuff you're talking about or is it a substitute. If anyone is interested, I can give specifics on where to get it. -Jim

Hello, I just found out about this group and decided to join. I've got an interesting collection of Tek scopes and other stuff, consisting of three RM561As, a 551, a 181A time mark generator, a 106 square wave generator, about 12 plugins, HP 523DR (tube frequency counter!), two HP122ARs (HP tube scope), North Atlantic Phase Angle Voltmeter, Fluke Differential Voltmeter, Kepco Power Supply, Waveforms Oscillator/voltmeter, 4 radios, 2 TVs (tube, one color, one B/W), an organ (Estey, 1961), Sherwood AM/FM tuner, Dynaco PAS-2, home made tube amp. I have a few other pieces of test equipment that are solid-state. Not looking so much to increase the size of my collection, more interested in keeping it all working and sharing ideas and stories with others. George

Hello, I just discovered this group and look forward to participating. Right now I can use some technical help, though. I am wrestling with a TEK 465 in the 32xxx serial # range that seems to work fine in all areas except vertical position display. Both channels have the same symptom, that is they have what seems to be an accurate display when the vertical position is centered, but when the position control for either channel is moved to either the top or bottom of the screen, the trace only goes as far as the next to last graticule and the signal gets compressed in amplitude until it disappears altogether. I have been spending most of my troubeshooting time in the vertical amplifier module because it appears that at least one stage may be driving into cutoff or just the oposite (too low gain) because the voltages on the vertical deflection plates do not show the movement that the manual indicates. I have not yet tried adjusting the gain pot because I need to find a signal source compatible with the manual procedure on this. The manual gives you the process but not much theory to allow for deviation. If anyone has seen this before or has any suggestions, I would appreciate hearing it. BTW, I am using a 453 to troubleshoot which has an intermittent high voltage supply. That will be the next project. Thanks in advance, good to have found this group. Bill Wollam

I'm very pleased to have found this group as I am a great lover and collector of vacuum tube Tek scopes here in Melbourne Australia. My collection includes examples of the 310A, 502, 524AD, 529, 533A, 535A, 547 (my workhorse bench scope), 549, the enormous 555 scoposaurus, 575 and many plugins including a homebrew spectrum analyzer built into an old plugin caracass and a Japanese commercial transistor testing plugin built into a Tek blank. I also have a number of other manufacturers' scopes as well, and sundry other pieces of Tek equipment and manuals. My interests include restoration and using these wonderful machines. I can remember the first time I saw an oscilloscope and being fascinated by it at the age of about 10. A few years later I saw my first Tek - a 549 with a 1A4 plugin - and it was a really mind blowing experience compared to the sorts of scopes experimenters had access to in the 1960s. Now I'm very happy to be able to own some of these instruments and fully understand their workings. I hope I will be able to contribute to the discussions here, both in the way of helping others and learning along the way. Cheers, Morris Odell

Eventually I have got it! The entire story is reported at http://space.tin.it/clubnet/egirland/tek475/vpots/vpots.html I want to thank you once again the group for the support and in particular Mr. Fred de Vries who helped significantly. Until next time, ciao.

I have a 454 that has no vertical deflection on ch1 or ch2, using another scope I am able to trace signal from the preamps to the deflection plates. The sweep appears to be in good shape and the trace is centered on crt. ( position controls have no effect on trace) What I don't understand is that I have a voltage imbalance on vertical plates and the trace is still centered!

I need a transformer or a working power supply for my 7904 scope.The serial # is above B260000. The transformer is T1310, part # 120-0742-00. The power supply assembly is # 620-0461-00 Paul Lewis 1317 Kingston Ridge Rd. Cary, NC 27511 1-919-467-2818 Please reply to ke4dnk@...

Yoohoo. I got a pair of NOS, Tek-boxed 8608 tubes for the vertical of my 556! They work great. Has anyone else had an 8608 fail on them. My bad one had a grid short. I noticed it because the vertical position knob acted like a light dimmer, making the tube glow incandescent white depending on the setting!!! Michael ----------------------------------------------------------------- Michael Dunn | Surround Sound Decoder & Stereo Enhancer Cantares | Self-Amplified Speakers, Test Equipment 74 George St. | Ambisonic Surround Sound CDs and Recording Waterloo, Ont. | (519) 744-9395 (fax: 744-7129) N2J 1K7 | mdunn@... Canada | http://www.cantares.on.ca/ -----------------------------------------------------------------

Hi, my name is Doug and I am looking for a User Manual and Service manual for a Tek 454 Scope. I had seen a source on the web but can't seem to find it now. Does anyone know were I might find these manuals? I understand tek is very expensive for printed versions of the manual Thanks DOug

Congratulations TekGroup! We've hit 100 members! ----------------------------------------------------------------- Michael Dunn | Surround Sound Decoder & Stereo Enhancer Cantares | Self-Amplified Speakers, Test Equipment 74 George St. | Ambisonic Surround Sound CDs and Recording Waterloo, Ont. | (519) 744-9395 (fax: 744-7129) N2J 1K7 | mdunn@... Canada | http://www.cantares.on.ca/ -----------------------------------------------------------------

I have picked up a 127 preamp power supply that is used to power a couple of 1- or letter plugins for use as instrument amplifiers. It's quite a boatanchor and seems to work OK but I want to replace the selenium rectifiers in it with silicon for safety reasons. There are 5 rectifiers in there. To save me a bit of measurement work, does anybody have any info on function/ratings of the rectifiers or whether Tek issued a bulletin on their replacement? Morris

I have a 7104 and now a 7103 that have the same readout problem. The readout is not visible unless the intensity knob is turned CW to the "pulsed" position and then pushed against the stop. On the 7104, I found that the TP1925 voltage was at -6.3V in the full CW position, and I could make the readout go on by pulling it to about -11V, so I tacked in a couple of resistors to change the range of the readout intensity control. (Note, another problem this scope has is that the A/B intensity knob indicator lamps don't activate properly, but I have no idea if that's related.) I wasn't totally happy with the above hack, and now that I have a 7103 with the exact same problem, I would really like to find the underlying cause... has anyone seen/fixed this? Thanks...

Just a little poll of sorts: I'm wondering where we all find old equipment -- at least the stuff we get for real cheap! I and a friend on this list have found pretty much all our stuff at "garage sales" held at a local university. We're talking REAL cheap. C$10-$20 (U$7-14) for anything from a 502A to a 549 or 556! $5 for a plug-in. Usually in very good condition. How about you? ----------------------------------------------------------------- Michael Dunn | Surround Sound Decoder & Stereo Enhancer Cantares | Self-Amplified Speakers, Test Equipment 74 George St. | Ambisonic Surround Sound CDs and Recording Waterloo, Ont. | (519) 744-9395 (fax: 744-7129) N2J 1K7 | mdunn@... Canada | http://www.cantares.on.ca/ -----------------------------------------------------------------

don't need a Another point: the 46x, 47x series just wasn't as sharp as the tube scopes! or even and especially - the 454, 454A. Some engrs. think the 454A best 150 MHz scope ever (2mV/DIV, all the delay triggering) or sometimes ~ 200 MHz if all went well on that assembly.. I can see the clear difference bewtween say, a 475A and the 454As - tiny wiggles just visible on 54-A disappear into the thick trace of 475 (or 465). Just in case you're trying to do better than it Can! Ashton

Hello, I have been pulling problems out of a 465 that I recently acquired. The last remaining problem is the inability to get a sharp focus on the trace with any combination of intensity, focus or astigmatism. I have checked everything in the CRT circuits with the exception of the high voltage, crt bias and cathode bias, until I get the use of an HV probe. Can anyone tell me if I am looking in the right area or suggest any common failure modes? The low voltage supplies all check good and noise free. Thanks for any help.

Does anyone know where I can pick up the GPIB OPT 10 for the Tek 2230 or the RS232 option? Thanks, Vince Coppola

Hi All My old faithful 7904 has started to have a little problem with the display. It will run for hours or days with no problem. Then it will start to drift the display up and down, this is the trace/s and readouts as well. Note this is not on oscillation up and down. It will shift up for awhile, then drop down lower then it should be for awhile. I am talking about a 1/2 CM or so. Everything is always on screen, it just gets annoying after awhile. I found I can turn off the readouts and it will stop. Turn the readouts back on, and it will be fine again for a few hours or days. Any ideas what might be going on and where to start looking before I tear into it. Thanks, Don BTW Hi Mark Gurries glad to see you on the list.

I believe you're right, Stan. I'd heard both explanations. Actually, the geometry story doesn't pan out well if you've ever seen one of the guns outside of the jug. the mesh is hemispherical in shape. If it dealt with geometry, I'd expect an odd shape to compensate for the extremes of the rectangular screen. For those who have never seen one, it is interesting. Very, very delicate, and so fine that when you hold it up to the light, it's like a diffraction grating, splitting the light up into different colors. It's also so fine that it will hold water. One little puff of air and you dimple it permanently. I send a piece of a mesh to friend Dale Johnson (used to work for Tek in the Dallas Service center, but at the time was working for a company that serviced scanning electron microscopes. He put the piece of mesh under a scope and the view was really interesting. It's quiet obvious that it's etched and not a woven screen that one first envisions. I don't know whatever happened to the Polaroid of that scan that I had. It should would make for an interesting post, but that was 25 years ago! Sometimes, during manufacturing, a little dirt gets inside the jug and finds its way to the mesh. The resulting display is a small spot on the CRT that just can't be illuminated by the beam because of the shadow effect it creates. I was rather irritated one time when a new 465B came in with that exact problem and the factory wasn't going to honor a warranty replacement of the jug because it was "still within all specifications of CRT anomolies". I put myself in the customer's shoes and decided that I wouldn't put up with a something like that in the windshield of a new car. Why should the customer put up with a manufacturing defectlike that in his $3500 scope? We replaced the CRT anyway and shoved the old one down factory's throat. Tek was starting to change from a very customer-oriented organization to a very money-conscious outfit. And Stan, I don't know that I agree 100% about the mesh being a bad deal compared to what the 535 had. I've never seen a burned CRT in a scope with a mesh and you can't say that about the old ones. The mesh diffused the beam enough that the CRT was pretty burn resistant. To me, the ±1 digit bobble of a digital scope is far worse to look at than the fuzzy trace of a 465. Dean

Can anybody accomodate Curt ? (see below). Please reply directly to him. Phil >Date: Thu, 03 May 2001 15:31:22 -0700 >From: Curtis Wheeler <curtw.curtw@...> >X-Mailer: Mozilla 4.7 [en]C-PBI-NC404 (Win98; U) >X-Accept-Language: en >To: phil@... >Subject: Tek P6451 data probes > >Hi. I have 8 perfect Tek P6451 data probes to sell or exchange for >perfect P6452 >probes. Thanks. Curt Wheeler > >