|
Re: Looking for a Tek 5030 or R5030 scope
David DiGiacomo
Too bad you missed this one: http://www.ebay.com/itm/182656200183
|
|
|
|
Re: 2465A Cap replacements
The files at TekScopeArc will work for the power supply (A2 and A3 I believe). The board with surface mount caps is the A5 board in some generations of the 2465B. My 2465A has no surface mount caps. I doubt that yours does either. The 2465A A5 board uses five 47 mfd 25 Volt caps (I used 35 Volt versions).
Take note on recapping the A3 board (part of the low voltage poser supply module). All Tek documentation for board layout has C1115 and c1132 swapped in position. Specifically, the board layout in the schematic shows C1115 where C1132 should be and C1132 where C1115 should be. C1132 is exposed to 97 volts and will immediately fail a low voltage capacitor such as C1115. So either check by noticing what you remove or by checking connection to related parts. I double check my work by verifying that the positive terminal of 250 Mfd 35 Volt C1115 directly connects to L1115. From: "spikeiskewl@yahoo.com [TekScopes]" <TekScopes@yahoogroups.com> To: TekScopes@yahoogroups.com Sent: Tuesday, August 15, 2017 4:13 PM Subject: [TekScopes] Re: 2465A Cap replacements I found some of the files over in the TekScopeArc. I'll see if I can find the other TekScopeArc 2 or something? cheers, #yiv8668311133 #yiv8668311133 -- #yiv8668311133ygrp-mkp {border:1px solid #d8d8d8;font-family:Arial;margin:10px 0;padding:0 10px;}#yiv8668311133 #yiv8668311133ygrp-mkp hr {border:1px solid #d8d8d8;}#yiv8668311133 #yiv8668311133ygrp-mkp #yiv8668311133hd {color:#628c2a;font-size:85%;font-weight:700;line-height:122%;margin:10px 0;}#yiv8668311133 #yiv8668311133ygrp-mkp #yiv8668311133ads {margin-bottom:10px;}#yiv8668311133 #yiv8668311133ygrp-mkp .yiv8668311133ad {padding:0 0;}#yiv8668311133 #yiv8668311133ygrp-mkp .yiv8668311133ad p {margin:0;}#yiv8668311133 #yiv8668311133ygrp-mkp .yiv8668311133ad a {color:#0000ff;text-decoration:none;}#yiv8668311133 #yiv8668311133ygrp-sponsor #yiv8668311133ygrp-lc {font-family:Arial;}#yiv8668311133 #yiv8668311133ygrp-sponsor #yiv8668311133ygrp-lc #yiv8668311133hd {margin:10px 0px;font-weight:700;font-size:78%;line-height:122%;}#yiv8668311133 #yiv8668311133ygrp-sponsor #yiv8668311133ygrp-lc .yiv8668311133ad {margin-bottom:10px;padding:0 0;}#yiv8668311133 #yiv8668311133actions {font-family:Verdana;font-size:11px;padding:10px 0;}#yiv8668311133 #yiv8668311133activity {background-color:#e0ecee;float:left;font-family:Verdana;font-size:10px;padding:10px;}#yiv8668311133 #yiv8668311133activity span {font-weight:700;}#yiv8668311133 #yiv8668311133activity span:first-child {text-transform:uppercase;}#yiv8668311133 #yiv8668311133activity span a {color:#5085b6;text-decoration:none;}#yiv8668311133 #yiv8668311133activity span span {color:#ff7900;}#yiv8668311133 #yiv8668311133activity span .yiv8668311133underline {text-decoration:underline;}#yiv8668311133 .yiv8668311133attach {clear:both;display:table;font-family:Arial;font-size:12px;padding:10px 0;width:400px;}#yiv8668311133 .yiv8668311133attach div a {text-decoration:none;}#yiv8668311133 .yiv8668311133attach img {border:none;padding-right:5px;}#yiv8668311133 .yiv8668311133attach label {display:block;margin-bottom:5px;}#yiv8668311133 .yiv8668311133attach label a {text-decoration:none;}#yiv8668311133 blockquote {margin:0 0 0 4px;}#yiv8668311133 .yiv8668311133bold {font-family:Arial;font-size:13px;font-weight:700;}#yiv8668311133 .yiv8668311133bold a {text-decoration:none;}#yiv8668311133 dd.yiv8668311133last p a {font-family:Verdana;font-weight:700;}#yiv8668311133 dd.yiv8668311133last p span {margin-right:10px;font-family:Verdana;font-weight:700;}#yiv8668311133 dd.yiv8668311133last p span.yiv8668311133yshortcuts {margin-right:0;}#yiv8668311133 div.yiv8668311133attach-table div div a {text-decoration:none;}#yiv8668311133 div.yiv8668311133attach-table {width:400px;}#yiv8668311133 div.yiv8668311133file-title a, #yiv8668311133 div.yiv8668311133file-title a:active, #yiv8668311133 div.yiv8668311133file-title a:hover, #yiv8668311133 div.yiv8668311133file-title a:visited {text-decoration:none;}#yiv8668311133 div.yiv8668311133photo-title a, #yiv8668311133 div.yiv8668311133photo-title a:active, #yiv8668311133 div.yiv8668311133photo-title a:hover, #yiv8668311133 div.yiv8668311133photo-title a:visited {text-decoration:none;}#yiv8668311133 div#yiv8668311133ygrp-mlmsg #yiv8668311133ygrp-msg p a span.yiv8668311133yshortcuts {font-family:Verdana;font-size:10px;font-weight:normal;}#yiv8668311133 .yiv8668311133green {color:#628c2a;}#yiv8668311133 .yiv8668311133MsoNormal {margin:0 0 0 0;}#yiv8668311133 o {font-size:0;}#yiv8668311133 #yiv8668311133photos div {float:left;width:72px;}#yiv8668311133 #yiv8668311133photos div div {border:1px solid #666666;min-height:62px;overflow:hidden;width:62px;}#yiv8668311133 #yiv8668311133photos div label {color:#666666;font-size:10px;overflow:hidden;text-align:center;white-space:nowrap;width:64px;}#yiv8668311133 #yiv8668311133reco-category {font-size:77%;}#yiv8668311133 #yiv8668311133reco-desc {font-size:77%;}#yiv8668311133 .yiv8668311133replbq {margin:4px;}#yiv8668311133 #yiv8668311133ygrp-actbar div a:first-child {margin-right:2px;padding-right:5px;}#yiv8668311133 #yiv8668311133ygrp-mlmsg {font-size:13px;font-family:Arial, helvetica, clean, sans-serif;}#yiv8668311133 #yiv8668311133ygrp-mlmsg table {font-size:inherit;font:100%;}#yiv8668311133 #yiv8668311133ygrp-mlmsg select, #yiv8668311133 input, #yiv8668311133 textarea {font:99% Arial, Helvetica, clean, sans-serif;}#yiv8668311133 #yiv8668311133ygrp-mlmsg pre, #yiv8668311133 code {font:115% monospace;}#yiv8668311133 #yiv8668311133ygrp-mlmsg * {line-height:1.22em;}#yiv8668311133 #yiv8668311133ygrp-mlmsg #yiv8668311133logo {padding-bottom:10px;}#yiv8668311133 #yiv8668311133ygrp-msg p a {font-family:Verdana;}#yiv8668311133 #yiv8668311133ygrp-msg p#yiv8668311133attach-count span {color:#1E66AE;font-weight:700;}#yiv8668311133 #yiv8668311133ygrp-reco #yiv8668311133reco-head {color:#ff7900;font-weight:700;}#yiv8668311133 #yiv8668311133ygrp-reco {margin-bottom:20px;padding:0px;}#yiv8668311133 #yiv8668311133ygrp-sponsor #yiv8668311133ov li a {font-size:130%;text-decoration:none;}#yiv8668311133 #yiv8668311133ygrp-sponsor #yiv8668311133ov li {font-size:77%;list-style-type:square;padding:6px 0;}#yiv8668311133 #yiv8668311133ygrp-sponsor #yiv8668311133ov ul {margin:0;padding:0 0 0 8px;}#yiv8668311133 #yiv8668311133ygrp-text {font-family:Georgia;}#yiv8668311133 #yiv8668311133ygrp-text p {margin:0 0 1em 0;}#yiv8668311133 #yiv8668311133ygrp-text tt {font-size:120%;}#yiv8668311133 #yiv8668311133ygrp-vital ul li:last-child {border-right:none !important;}#yiv8668311133 [Non-text portions of this message have been removed]
|
|
|
|
Re: 2465A Cap replacements
Spike
I found some of the files over in the TekScopeArc.
I'll see if I can find the other TekScopeArc 2 or something? cheers,
|
|
|
|
2465A Cap replacements
Spike
Hi,
Before I start to replace these, I need to find the file that has which are the caps to replace and on which boards. I have an 2465A, and I understand the difference with the 2465B is the latter has the SMDs on one of the boards? I'll look around for the battery replacement check while I'm at it.
|
|
|
|
Re: Looking for a Tek 5030 or R5030 scope
John Griessen
On 08/15/2017 10:20 AM, walter2@sphere.bc.ca [TekScopes] wrote:
R5030 for $600 on ebay, but too much for me, I was hoping for something a bit better.Yes, the last hamfest I went to in Belton TX they were $10 in that condition. Not seen lately though.
|
|
|
|
Re: 575 Mod122C with keys. SN005100
David Holland
There's a couple of paper capacitors in the HV supply. I'd be more likely
to suspect them than the transistors. Everyone I've repaired (a whopping two) has came up just fine once I got done recapping it (except the one that had a busted CRT, it needed a new one of those too..... :-) ) David On Tue, Aug 15, 2017 at 2:55 PM, 'Craig Sawyers' c.sawyers@tech-enterprise.com [TekScopes] <TekScopes@yahoogroups.com> wrote: Anyway I have now turned it on - probably the 1st time in 10 years fromthe internal grot - andalthough there is no trace the LV supplies are spot on.There is a germanium power transistor in there that can sometimes be
|
|
|
|
Re: 575 Mod122C with keys. SN005100
Christopher Hilton-Johnson
Dennis
toggle quoted messageShow quoted text
As to the photos, you are correct as ever - & if I can work out how to do that easily I will upload some photos (why yahoo will not allow photos to accompany posts I will never understand) That it was adapted for the educational market was my 1st thought, also from the safety point of view. Easily accessable big volts not good if students can get close to them! I need to get it clean & working before I can understand the extra key operated on/off switch (it certainly does not turn either the LV or EHT supplies off) Will continue a bit of fettling over the next week or so & let the group know if I find anything useful Christopher
On 15/08/2017 05:04, 'Dennis Tillman' dennis@ridesoft.com [TekScopes] wrote:
|
|
|
|
Re: 575 Mod122C with keys. SN005100
Craig Sawyers <c.sawyers@...>
Anyway I have now turned it on - probably the 1st time in 10 years from the internal grot - andThere is a germanium power transistor in there that can sometimes be rather flakey. Something to do with collector control if I remember correctly. You could test it with a curve tracer (ha ha) Craig
|
|
|
|
531A needs a new home
Hi All,
I have a 531A scope with a 53/54B plugin still in the box as it was returned from the Tektronix cal lab back in 1976. I recently pulled the staples out top open the box to see what was inside. I am downsizing and this needs a new home. I would rather not try to ship it, but I will be traveling to the Huntsville AL hamfest this weekend if anyone is interested. Please respond privately -- James True N5ARW www.boatanchor.com
|
|
|
|
Re: 575 Mod122C with keys. SN005100
Christopher Hilton-Johnson
Craig
Yes it could be, but then I would have hoped some accompanying paperwork might have given a clue. Anyway I have now turned it on - probably the 1st time in 10 years from the internal grot - and although there is no trace the LV supplies are spot on. If I can remember how to post a photo in the archive I wIll upload a few Good to be back on the forum after several years as just a lurker! Christopher On 14/08/2017 07:35, 'Craig Sawyers' c.sawyers@tech-enterprise.com [TekScopes] wrote:
[Non-text portions of this message have been removed]
|
|
|
|
Re: Overkill use for fast scope
cmjones01
On 14 Aug 2017 9:56 p.m., "very_fuzzy_logic@yahoo.com [TekScopes]" <
TekScopes@yahoogroups.com> wrote: Maybe you should be concerned if you suddenly get requests from Pyongyang for help with fixing garage doors! I shall remain vigilant and not let my advanced garage door repair technology fall into the wrong hands! Sorry but I should have replied earlier when you posted your results on risetime measurements with the 7A29. It must have been me who pipped you on the7A29P! I measured only a small reduction, from 700psec with a 7A19 to 600-650psec with the 7A29P. That's interesting. I'm glad to know the 7A29P went to a good home. There can't be that many of us with an application for one. I'm not having much luck with eBay recently. I had my heart set on a 7904A in the UK with an appealing set of plugins, but someone else bought it while I was confirming some details with the seller. I'm sure another one will be along in 5 years or so :-/ Chris
|
|
|
|
re-making pushbuttons
in several groups, the problems of the ink markings coming off pushbuttons has been a recurring theme. Tek buttons and rotary knob skits are especially easy to remove the markings (windex can usually do it), and very frustrating when blank.
the whole concept of pad marking buttons is a very low quality technique, and really not suitable for long term use. keyboard makers have known this for decades, and use a two-shot injection mold to make the character a part of the button itself. you can restore any blank button easy simply by cleaning the surface, then engrave the desired legend, and back fill with black paint, it is pretty much indestructible at that point. before you say "I have no way to engrave it", most jewelers, or trophy awards places have an engraving pantograph and do it cheaply and quickly for very little money. we used to have one in our shop, and used it for panel markings and similar stuff all the time. they show up on ebay, and you can actually make one easily with a small dremel tool, just search youtube for examples. all the best, walter sphere research corp.
|
|
|
|
Looking for a Tek 5030 or R5030 scope
Does anybody have one to sell or trade? I am interested in the look and functionality of this unit, but haven't seen one for a long time. there is a rough unknown condition R5030 for $600 on ebay, but too much for me, I was hoping for something a bit better. the 5030 would be perfect, not sure the storage 5031/R5031 would be easy to keep running at this point, but maybe an alternative.
any leads appreciated. this is such nice looking unit with a BIG CRT, and ideal for low level audio work, so it's right up my alley. all the best, walter (walter2 -at- sphere.bc.ca) sphere research corp.
|
|
|
|
Re: OT: CRT Yokes/ferrite
mosaicmerc
Good news.
I pulled the yoke ferrite from a 12 year old CRT 14" monitor. Averaged the dimensions, knowing turns and inductance, to calculate the permeability as a toroid and it came out to about 800. AL of 730 . That looks exactly like a large ferrite mix 43. Precisely the recommended mix for the output impedance transformer! Still might have to locate some low DF , hi Q 600V+ caps for the output tuning (2 to 4nF). Interestingly, I measured 12 cm x 9 cm piece of double sided 1oz copper flex PCB and it is 5nF but the Q is 'only' 70 at 100Khz. The dielectric is good to several KV though. Might be worth a try as I only need to run the amp for a few minutes at a time. Will probably have to cut it into a disc and dip it in fibre glass resin. Tried some copper foil 'tape' with kapton tape dielectric and the Q was even less. I have some 0.5 mil Mylar dielectric to try out and see. I've only tested the mylar to 170Vpp (mains) as transistor insulators with hi thermal performance as they're so thin. A silver mica 3.3nF cap (1KV) has upwards of 2000 Q. The CRT flyback ferrite looks a bit smaller than the one I got from the laser cutter PSU. Haven't desoldered it yet to check its permeability, we'll see if it's similar to the mix 31 as in the laser ferrite.
|
|
|
|
Re: KO4BB Manual Pages
Glydeck
Didier,
toggle quoted messageShow quoted text
Thank you! Your site has always been an amazing resource. Glydeck KD6NEW Sent from my iPad
On Aug 14, 2017, at 8:55 PM, 'Dennis Tillman' dennis@ridesoft.com [TekScopes] <TekScopes@yahoogroups.com> wrote:
|
|
|
|
Re: 575 Mod122C with keys. SN005100
Hi Christopher,
toggle quoted messageShow quoted text
Back in the day 400V collector voltages were not common and those voltages were present on banana plugs that were easy to touch. I suspect this was a modification that made a lot of sense in certain settings such as a technical college or training facility. I have never heard of this being done before but the Mod 122C was not so common that I have seen a lot of them. It sounds like it was done quite well so perhaps it was a factory modification. If it was made for the European market this key lock would make more sense because Europe is much more safety conscious about voltage since they use 220 which is far more dangerous than the 110V used in the USA. A picture is worth a thousand words. It would be nice to see a picture of the front panel. Dennis Tillman W7PF
-----Original Message-----
Sent: Sunday, August 13, 2017 12:07 PM Subject: [TekScopes] 575 Mod122C with keys. SN005100 Recently acquired one of these. It has a 3 position key operated lock in place of the knob used for the 3 position Peak Volts Range and an additional 2 position key operated lock mounted in the bottom left hand corner of the front fascia. The key positions are marked "Off" and "On" The same key operates both locks. The key is locked in its lock except where (in the Peak Volts Lock) the 0-20 position is selected and (in the lower left lock) the 'Off" position is selected. Each lock is marked with either 3 ( Peak Volts Lock) or 2 (lower left lock) red coloured intented dots, corresponding to the possible key positions. The whole looks either original or a professionally added modification The accompanying manual is silent. To my limited knowledge it did not come from an educational establishment. any ideas before I turn it on? Anyone seen something similar? crippo2 ------------------------------------ Posted by: Christopher Hilton-Johnson <chj@pchjhome.com> ------------------------------------
|
|
|
|
Re: KO4BB Manual Pages
Hi Didier,
toggle quoted messageShow quoted text
Thank you for the update and for the years of unselfish support you have provided all of us (not just Tek folks) with you wonderful website. Your contribution makes it possible for me personally to have a wonderful lab full of test equipment. And a special thank you for the Thunderbolt monitor program you gave me many years ago. It quickly became an integral part of my GPS Frequency Standard. I have received many complements on your GPS monitor program. If there is any way I can be of help to you please let me know. It's the least I can do. Dennis Tillman W7PF
-----Original Message-----
On 8/13/2017 2:54 PM, Didier Juges shalimr9@gmail.com [TekScopes] wrote: later.
|
|
|
|
Re: KO4BB Manual Pages
Tom Jobe <tomjobe@...>
Thank you Didier!
Your site has been a great source of manuals for many years! It is very easy to upload and download files on your site. tom jobe... On 8/13/2017 2:54 PM, Didier Juges shalimr9@gmail.com [TekScopes] wrote:
[Non-text portions of this message have been removed]
|
|
|
|
Re: KO4BB Manual Pages
Ken Burchfield
Thanks for the update,
Appreciate your site and your dedication for a source for data. 73, Ken.......k5jxl ---In TekScopes@yahoogroups.com, <shalimr9@...> wrote : News flash! If you have been using my site to upload and download manuals, you may have noticed that in the last year or so I had become fairly slow at checking new uploads and moving them to the general area so that they can be downloaded. The reasons were multiple and I want to take this opportunity to apologize to you. Just because this service is free is not an excuse to make it hard to use or inconvenient. The good news is that I do have a new tool now that allows me to check and move the uploaded manuals to their respective folders conveniently. More improvements are planned to the upload log (letting you know what the file name was changed to and where it was moved), these will come later. This primarily applies to documents in PDF or image (GIF, JPG, PNG) format that I can easily preview. DOC, ZIP or RAR files unfortunately still require more manual intervention, so they will not benefit from this improvement, but since I will spend less time processing the PDF files, which are the vast majority of the files that are uploaded, I will have more time available for the rest. I remind you that files that are in the Upload folder are readily accessible via ftp, so if you need one or more files that are in the Upload folder and that I have not moved yet, fire up your ftp client (info is on the Manuals page). Thank you for your patience and patronage. Didier KO4BB
|
|
|
|
Re: Why all the trouble with A & B Sweep mechanic interlocks
Hi David,
toggle quoted messageShow quoted text
First of all, thanks for your reply and apologies for taking so long to give a feedback. to your points (between quotes, in Italics). While examining more carefully the mechanics, I think I misinterpreted part of what I was thinking had also an interlock (at the begging of the dial) and I could understand why the other interlock (at the end of the dial). *"Part of it is that to save space on the front panel, it makes sense* *for the two sweep controls to be concentric since they share almost* *all of the same legends"* Fully agree, Many scopes from several brands have concentric A &B sweep knobs... Still they could be concentric while being independently actuated (in many designs, a lower wider knob and a higher, thinner knob) *"Beyond that, it does not make any sense for the B sweep to be slowerthan the A sweep and interlock between the controls prevents this"* Agree again, one of the features (not the only one) of the mechanical locks between the upper (gray knob) and the lower (transparent dial) is a fixed protruding pin that prevents the B sweep's gray knob to be turned more counter-clock wise than the A sweep's transparent dial. Still, that "stopper" pin could be the ONLY mechanical restraint acting between both knobs...but no... there is the other one (which is the one I think is awkward). *"Maybe you are referring to the 485 timebase which operates in a wayvery similar to the 7B92A timebase?"* Not really, I`m not familiar with the 485, although I had a look at its picture on TekWiki and it seems it operates (at least mechanically) similarly as the 465 / 464 / 466 and 475 (only that the interlock range on the 485 encompasses the 3 last sweep speeds, while the interlocks of the 46x and 475 are only for the last 2). In either case, there's a marking "A only when knobs locked"... I`m not sure if the 485 has a an electrical justification for that, but for the 465, and the 464 I own, it simply isn't true. Even when both knobs are locked (although I agree, useless), BOTH timebases are still operational and available (not only A as the markings suggest). You can even delay only trigger the B sweep or Trigger after delay (although I`m not sure the DTP markings / measurements can be trusted.... Maybe that's the reason?) The markings and the B sweep's restrained "PULL" action over the last 2 ranges, also suggest that, once the B sweep would be on either of the 2 last ranges, the A sweep would forcibly need to be: 1.) locked to the B sweep (and therefore there would be only A sweep), or 2.) to be at 0.2us or SLOWER. Neither actually is true. The locking mechanism indeed prevents you from unlocking B from A, if the knobs are already locked and on either of the 2 last ranges... BUT. If you unlock them at any other range, you can move B, say, to the last range, and then move the A sweep to the 2nd last range (which the markings imply is not valid, or not existent, but are), up to the point that, if you advance the A timebase further (to the last range), both sweeps become locked again and can only be unlocked while moving the knobs away from the last 2 ranges. The explanation I found, to this construction is only one... They wanted to allow the operator to change the A sweep's setting by turning one single knob, the B sweep knob (one made larger and with a firm grip) and for some reason, they didn't want to make the 2 knobs, each at a different level, and each with is own grip. Maybe to save space on the panel, for the fingers to grab and move around a wider, closer to the panel knob. They came up then with this knob, that would allow you to position the A sweep speed first, and then unlocking them, control the B sweep apart from the A. I think only later they added the awkward, tiny and rather uncomfortable TAB, on the transparent dial of the A knob, to allow the change of A sweep without having to lock the knobs again. The 453 and the 454 apparently don't have the tiny tab and I suspect that, once unlocked, if the operators needed to re-set the A sweep, they were forced to lock the knobs again. Which was probably annoying. Since the two concentric knobs need to be locked, in order for the operator to gain control of the A sweep, they devised this "pull-to-unlock" spring loaded action... But it has some mechanical drawback... It seems that in order for that spring-actioned unlock mechanism to work, you need to turn the B knob apart (clockwise) at least 2 clics (in the case of the 46x/475... not sure about the 485), before you can turn it back (ccw) or turn the A dial forward (cw) into their locking position and the "thing" works. Therefore, they added the interlock (at the end of the B sweep's axle) to prevent the operator from pulling the B knob (to unlock them) if they're at any of the last 2 positions, in order to assure they won't jam or something in those lines... To remain consistent with the knob's "PULL-TO-UNLOCK" mechanical constraints, they added the "A SWEEP ONLY WHEN KNOBS LOCKED" panel marking, implying that deviating from that would be invalid... while the settings "per se" are not invalid. Well. Those at least are my conclusions, to make sense from what they did... (It doesn't mean I concluded it right). Still, I cannot figure out WHY... If they could have just made the TWO KNOBS (even concentric) directly actionable by the operators (one outer ring and one inner knob)... Rgrds, Fabio 2017-07-24 13:31 GMT-03:00 David davidwhess@gmail.com [TekScopes] < TekScopes@yahoogroups.com>:
|
|
|
