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Re: Seeking extenders and pinouts
John Griessen
On 12/24/2015 06:32 AM, Mark wendt.mark@gmail.com [TekScopes] wrote:
That bare copper should at a minimum be covered with solder mask orOh, my extenders are not much better -- the land to solder wires to is exposed also. They are made with standard PCB fab methods so they have some solder mask, but not in a very exposed spot. The people that want this kind of extender 80% want the lowest cost way that is known to work well, even if it costs a good 2 hours of assembly time, (for the non-speedy). I think a "guy with milling machine" could offer lots of decent kits if he offers a matched connector. My connector search and customization was the largest effort of putting my kit together. John
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Re: Tek 314
John Clark
Mike, good point. I will do just that. It was a freebie scope and is all a learning experience for me at this point anyway. Since it was much easier to get to, I measured at the P700 plug and not the plug at the back of the tube so it can't hurt to verify that it's the heater and not the plug or pins. I thought at one point I saw 10-12 Mohms on it but could never duplicate that. A loose connection wouldn't be out of the question.
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John
To: TekScopes@yahoogroups.com
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Re: tektronix 7000 series pcb extender
Peter Gottlieb
I bought a couple of those and am very happy with them.
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Peter
On Dec 26, 2015, at 2:58 PM, John Griessen john@ecosensory.com [TekScopes] <TekScopes@yahoogroups.com> wrote:On 12/23/2015 09:04 PM, 'Dennis Tillman' dennis@ridesoft.com [TekScopes] wrote:No, the boards use the TAPR license. It is a free license to use with the hope that
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Re: tektronix 7000 series pcb extender
John Griessen
On 12/23/2015 09:04 PM, 'Dennis Tillman' dennis@ridesoft.com [TekScopes] wrote:
No, the boards use the TAPR license. It is a free license to use with the hope that if you add improvements you will share them back to the project. I make and sell those extender kits. They'll even get a web page some time in 2016. For now, they sell about ten a year by this text email message: http://ecosensory.com/tek/tek_7K_flex_sales_blurb.txt and the assembled kit looks like this: http://ecosensory.com/tek/TEK_7K_FLEX_assy-012-sm.jpg John Griessen -- Ecosensory 1218 W 39th St. Austin TX 78756
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Re: Tek 314
Disclaimer- my ignorance of Tek CRT construction details is absolutely
unsurpassed. But one problem that I have seen on occasion with octal base vacuum tubes, and with "garden variety" CRT's (RCA, GE) is that the wire connections from the internal element(s) to the CRT pins can go bad. Specifically, due to a gone-bad solder connection from that wire to the CRT's connector pin (outside of the glass seal where the wire exits the glass envelope). If so, maybe the bad heater pin(s) can be carefully resoldered. On tubes/CRT's where I have observed this, the bad connection was visible by looking at the end of the pin- the wire could be seen "floating" in the interior of the pin. As David has wisely said, if there's no way of getting the heater to actually heat up, then the CRT is toast, but if the bad circuit is at the external pin on the CRT, and therefore external to the vacuum itself- and maybe you can do a visual check to see if this is a possibility- why not try to fix it? Mike Dinolfo N4MWP On 12/26/2015 02:30 PM, David davidwhess@gmail.com [TekScopes] wrote:
[Non-text portions of this message have been removed]
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Re: Upgrading the DC505
This would be a lot of work for such an old universal timer/counter
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although the DC505, DC505A, and 7D15 are notable for having twice the bandwidth and 10 times the clock of most universal timer/counters and having oscilloscope like inputs and triggering. I prefer reciprocal operation like the DC509 and DC510 provide to raw speed; for that I have an HP5315A and Racal-Dana 1992. I was just looking over the DC509 manual and it does not have the capability of displaying the trigger level. The DC510 does though which is no surprise.
On 25 Dec 2015 17:42:22 -0800, you wrote:
The dimensions of the 7 Digit LED display look pretty close to a bare 16x2 LCD.
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Re: Massive document depository-bigger than I thought
On Sat, 26 Dec 2015, public@enkore.de [TekScopes] wrote:
It is 110 Gbytes _TOTAL_ starting from the root. With _ALL_ vendors, corresponding website stuff/glue and the kitchen sink. There are also many other vendors in the parent folder:--- ****************************************************************** * KSI@home KOI8 Net < > The impossible we do immediately. * * Las Vegas NV, USA < > Miracles require 24-hour notice. * ******************************************************************
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Re: Massive document depository
Dave Wise
Downloading Hook, Bee, and BSTJ. Thank you, David.
Dave Wise ________________________________________ From: TekScopes@yahoogroups.com [TekScopes@yahoogroups.com] Sent: Saturday, December 26, 2015 11:01 AM To: TekScopes@yahoogroups.com Subject: Re: [TekScopes] Massive document depository I managed to get multiple open trackers working this time so these should be more reliable. The Bee Documentation torrent is 58.1GB and contains just a subset of what is found at Bee including the Tektronix and HP sections. These links are uTorrent compatible magnet links; I do not have a way to conveniently host the torrent files themselves. Bee Documentation - 58.1GB: magnet:?xt=urn:btih:B38A05A5EFE4239D47E979C8BF5DD66D7B093CD7 Here are some other Tektronix related torrents I am hosting. 2336: magnet:?xt=urn:btih:78CFC825CA879457283AA320A199958A2A325AC1 Tektronix - 155-0022-00 - Channel Switch.pdf: magnet:?xt=urn:btih:4DF792045B09CCF6B64AE613A731C2F01A142997 Tektronix - Getting Rid of Hook - The Hidden PC-Board Capacitance.pdf: magnet:?xt=urn:btih:B2C4280F729C9EF0EB1DBDE8161A64DDEE47795E Tektronix 7403N: magnet:?xt=urn:btih:573DD19E6947712E82F96245C18FABD61D15D167 Here is the Bell Systems Technical Journal which is 39.9GB. I am not the original host for this and have been seeding it for the past year: magnet:?xt=urn:btih:B7AC86621E38B27529F7AFA4FC318E2D0B0CA646 Here are a couple of videos about microprocessor design by Bob Colwell at Intel and Kevin McGrath at AMD: magnet:?xt=urn:btih:F02D26B9C92A63880ABBDF34B6E82B459D5A4CBC On Fri, 25 Dec 2015 12:46:40 -0600, you wrote: Ok. I will add a couple of other sections for which I have ------------------------------------ Posted by: David <davidwhess@gmail.com> ------------------------------------ ------------------------------------ Yahoo Groups Links
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Re: Massive document depository-bigger than I thought
vdonisa
They surely do. And they surely can have a cool career to. For example, Lamborghini has no less than 6 openings for EEs right now.
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---In TekScopes@yahoogroups.com, <hpnpilot@...> wrote : Maybe they have a really cool bunch of EEs there.
On 12/26/2015 2:28 PM, vdonisa@... mailto:vdonisa@... [TekScopes] wrote:
> > > Looks like you're hitting a computer belonging to the Polytechnic Institute in > Gdansk. Most likely in the Applied Physics department. > > ---In TekScopes@yahoogroups.com mailto:TekScopes@yahoogroups.com, <stefan_trethan@...> wrote : > > Has anyone figured out any kind of associated website? > > I'm sure one of you whiz-kids who reads his email on a Z80 powered > command line client is able to sniff the owner of this stash out for > us? > > I'd like to know just who's pockets we are picking here. > > ST > > > > >
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Re: Massive document depository-bigger than I thought
Peter Gottlieb
Maybe they have a really cool bunch of EEs there.
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On 12/26/2015 2:28 PM, vdonisa@yahoo.com [TekScopes] wrote:
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Re: Tek 314
If the heater is open then the CRT is dead; it should read just a
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couple of ohms. The only doubt would be if the CRT heater pin identification was questionable.
On Sat, 26 Dec 2015 14:26:07 -0500, you wrote:
My Fluke 80k-40 just showed up and I find I'm getting only -1420V on TP701. This is supposed to be -1900V. When I turn up the intensity it shows around -1410V.
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Re: Massive document depository-bigger than I thought
vdonisa
Looks like you're hitting a computer belonging to the Polytechnic Institute in Gdansk. Most likely in the Applied Physics department.
---In TekScopes@yahoogroups.com, <stefan_trethan@...> wrote : Has anyone figured out any kind of associated website? I'm sure one of you whiz-kids who reads his email on a Z80 powered command line client is able to sniff the owner of this stash out for us? I'd like to know just who's pockets we are picking here. ST
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Re: Tek 314
John Clark
My Fluke 80k-40 just showed up and I find I'm getting only -1420V on TP701. This is supposed to be -1900V. When I turn up the intensity it shows around -1410V.
Should I chase that a bit or does the OL on the CRT heater I mentioned in my last post mean it's over for the CRT? Thanks, John
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Re: Massive document depository-bigger than I thought
stefan_trethan
Has anyone figured out any kind of associated website?
I'm sure one of you whiz-kids who reads his email on a Z80 powered command line client is able to sniff the owner of this stash out for us? I'd like to know just who's pockets we are picking here. ST
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Re: Tek 314
John Clark
Thanks Bert. Yes. When I push the "Store" button I get two, sort of oblong, out of focus beams, maybe 0.5" in tall and 0.75" in width that start out near the center of the screen and quickly move in opposite directions and go off the left and right sides of the screen. If I turn off store and hit store again within a second or two I don't get them again. If I wait around 5 seconds before pressing store again I'll get them again but they don't start out in the center. If I wait 10-20 seconds before pressing store again they'll start out near the center and go off the sides of the screen again. The screen is supposed to light up fully when pressing store but instead I get these two quick beams. If I'm reading them right, the diagrams show that when the store button is pressed it closes S500A and completes the circuit to pins 7 and 4 putting -90V to the flood gun heaters. That appears to, at least, be doing something.
I've looked with the lights out and can see no other screen activity with exception of the above. I unplugged P700 and ohm'd out the CRT heater (that's what's on pins 12 & 14, correct?) and got OL. If that's supposed to be a low ohm reading then that would be a bad sign. It won't be surprising if the CRT is bad since it does have that very small piece of something rattling around inside it that I mentioned a while back. It was suggested earlier in this thread, though, that the small piece rattling inside wasn't necessarily the end for the CRT, in and of itself. I was hoping it might still be OK. John Did you say earlier that the flood guns ( store ) did something? i.e.some light on the screen. If this is no and if the vertical pins are set to about the same voltage with the position control, I guess I'm out of ideas except to wonder about the CRT. (2) Are you checking for CRT activity in a dark!!! room? Some possible faults can result in a very dim trace. Also check for any!! CRT activity during power up / power down. (3) Did you "Ohm out" the heater? This should show a low reading. On 12/25/2015 9:55 PM, John Clark johnclark05@outlook.com [TekScopes] wrote: OK, using my now pristine 475 (thanks to everyone here,) I did a little more probing around on my dead 314. I checked the L/R horizontal deflector pins and have nice opposite sawtooth waveforms there. I then checked CRT pins 9 & 5. I have a 100vpp square wave on pin 9. Just as you say, the pulse is on longer than it's off. The on/off time does change when I change the tim/div knob, which makes sense to me. I'm pretty sure that's all as it should be. On the other side, on pin 5, I have a steady +100VDC. Seems to me that's what I should be seeing there, too. If there's 100v on each side then the display should be unblanked. When one side goes to zero then it blanks...am I understanding that correctly? If so, I'm thinking I either have a bad CRT or a problem in the HV section. I did order a Fluke 80k-40 to go with my 87V that should be here in a day or two as I figure I'll need it sooner or later. Anything else I can check before my HV DVM probe arrives? John .
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Re: Massive document depository
I managed to get multiple open trackers working this time so these
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should be more reliable. The Bee Documentation torrent is 58.1GB and contains just a subset of what is found at Bee including the Tektronix and HP sections. These links are uTorrent compatible magnet links; I do not have a way to conveniently host the torrent files themselves. Bee Documentation - 58.1GB: magnet:?xt=urn:btih:B38A05A5EFE4239D47E979C8BF5DD66D7B093CD7 Here are some other Tektronix related torrents I am hosting. 2336: magnet:?xt=urn:btih:78CFC825CA879457283AA320A199958A2A325AC1 Tektronix - 155-0022-00 - Channel Switch.pdf: magnet:?xt=urn:btih:4DF792045B09CCF6B64AE613A731C2F01A142997 Tektronix - Getting Rid of Hook - The Hidden PC-Board Capacitance.pdf: magnet:?xt=urn:btih:B2C4280F729C9EF0EB1DBDE8161A64DDEE47795E Tektronix 7403N: magnet:?xt=urn:btih:573DD19E6947712E82F96245C18FABD61D15D167 Here is the Bell Systems Technical Journal which is 39.9GB. I am not the original host for this and have been seeding it for the past year: magnet:?xt=urn:btih:B7AC86621E38B27529F7AFA4FC318E2D0B0CA646 Here are a couple of videos about microprocessor design by Bob Colwell at Intel and Kevin McGrath at AMD: magnet:?xt=urn:btih:F02D26B9C92A63880ABBDF34B6E82B459D5A4CBC
On Fri, 25 Dec 2015 12:46:40 -0600, you wrote:
Ok. I will add a couple of other sections for which I have
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Re: Horizontal Sweep Problem
I does look like it but I was thinking the problem is different
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because the sweep looks so linear which is easy to see with the test signal shown in the video. It is easy to check; the schematic shows the voltages around Q747 during normal operation without the beamfinder engaged.
On 26 Dec 2015 07:31:26 -0800, you wrote:
This looks like the effect the beamfind has on the sweep although it would be defocused so I doubt its the actual switch. I would look at the beamfind circuit voltages around R764/VR764. Of course its possible its U760 which will be a problem for a replacement. Also the A and B sweep gain and x10 pots are notorious for going o/c on these, see if they have any effect on the display.
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Re: Tek 314
Bert Haskins
On 12/25/2015 9:55 PM, John Clark johnclark05@outlook.com [TekScopes] wrote:
Did you say earlier that the flood guns ( store ) did something? i.e. some light on the screen. If this is no and if the vertical pins are set to about the same voltage with the position control, I guess I'm out of ideas except to wonder about the CRT. (2) Are you checking for CRT activity in a dark!!! room? Some possible faults can result in a very dim trace. Also check for any!! CRT activity during power up / power down. (3) Did you "Ohm out" the heater? This should show a low reading. Key section is at the bottom of FO 10.& 5
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Re: Horizontal Sweep Problem
chipbee40
This looks like the effect the beamfind has on the sweep although it would be defocused so I doubt its the actual switch. I would look at the beamfind circuit voltages around R764/VR764. Of course its possible its U760 which will be a problem for a replacement. Also the A and B sweep gain and x10 pots are notorious for going o/c on these, see if they have any effect on the display.
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Re: Massive document depository-bigger than I thought
Marian Beermann
There are also many other vendors in the parent folder:
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http://bee.mif.pg.gda.pl/ciasteczkowypotwor/
On 26.12.2015 03:28, Sergey Kubushyn ksi@koi8.net [TekScopes] wrote:
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