Date   

Re: Tek 314

Mike Dinolfo
 

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:

If the heater is open then the CRT is dead; it should read just a
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.

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


[Non-text portions of this message have been removed]


Re: Upgrading the DC505

 

This would be a lot of work for such an old universal timer/counter
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.
I could do a uC driving a 16 x2 LCD (using line 1) to replace the LED digits to display the 7 digits with correct postscript text, like ####### Mhz/uS/nS etc. It will also knock out some of that high current LED synchronous switching. They produce a lot of transient edges.

That leaves line 2 to always display both A and B trigger level set points, 12 bit accuracy, should be ok.

Shouldn't be too tricky, just yank the 7447 BCD to 7 segment (U780) and the 74145 (U755) BCD to decimal digit scanning display driver and jumper direct into those sockets. Tap into the decimal dot drive jumper, the nS, uS & mS Led drives and the mode selector rotary switch then remove the LED panel and replace with the LCD.

In fact, looking at the main-board layout (A1,B1,C1,A2,B2,C2 grid squares), U755 and associated common anode resistors (14) & 2n2907 transistors (7) can be completely removed and replaced by the uC PCB socketed into the U755 socket for power and signals and feeding the existing LED com. anode. digit jumper currently fed by the common anode transistor collectors.
The 7 common anode drive lines are repurposed for the 16x2 LCD using 4 bit mode. So that's convenient, being able to reuse the existing jumpers to the display board without mods. Only the Gate LED will remain as OEM.
The Mhz/us, Khz/ms and nS LEDs will all be made redundant by the context sensitive LCD display. Should be able to display the ratios & event counts etc. using proper terminology as well.

Certainly a lot better man machine interface plus less transients & current draw.

[Non-text portions of this message have been removed]


Re: Massive document depository-bigger than I thought

Sergey Kubushyn
 

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:
http://bee.mif.pg.gda.pl/ciasteczkowypotwor/

On 26.12.2015 03:28, Sergey Kubushyn ksi@koi8.net [TekScopes] wrote:


On Fri, 25 Dec 2015, mosaicmerc@yahoo.com [TekScopes] wrote:

110 Gbytes total. It took me something like 36 hours to mirror it.

Does this mean there's more Tek stuff at this link...and the OP only
posted one folder?
http://bee.mif.pg.gda.pl/ciasteczkowypotwor/Tek/
http://bee.mif.pg.gda.pl/ciasteczkowypotwor/Tek/


------------------------------------

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Yahoo Groups Links


---
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* 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
instruments, setup a torrent using DHT and an open tracker, and post a
link here.

My connection is not all that fast but I regularly host torrents over
the long term. I have been hosting the 40 GB Bell System Technical
Journal for about a year and have uploaded 829 GB from it.

On Fri, 25 Dec 2015 10:28:39 -0800, you wrote:

Thank you, David. The HP and Tek sections are this group's primary interest, but I'll enter any swarm you start. Once I have it, I will continue to seed until I have passed it on several times.

Dave Wise

------------------------------------
Posted by: David <davidwhess@gmail.com>
------------------------------------


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Yahoo Groups Links


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.

---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
>
>
>
>
>


Re: Massive document depository-bigger than I thought

Peter Gottlieb
 

Maybe they have a really cool bunch of EEs there.

On 12/26/2015 2:28 PM, vdonisa@yahoo.com [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, <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




Re: Tek 314

 

If the heater is open then the CRT is dead; it should read just a
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.

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


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


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


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


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






















.


Re: 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
instruments, setup a torrent using DHT and an open tracker, and post a
link here.

My connection is not all that fast but I regularly host torrents over
the long term. I have been hosting the 40 GB Bell System Technical
Journal for about a year and have uploaded 829 GB from it.

On Fri, 25 Dec 2015 10:28:39 -0800, you wrote:

Thank you, David. The HP and Tek sections are this group's primary interest, but I'll enter any swarm you start. Once I have it, I will continue to seed until I have passed it on several times.

Dave Wise


Re: Horizontal Sweep Problem

 

I does look like it but I was thinking the problem is different
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.


Re: Tek 314

Bert Haskins
 

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
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.
I must admit that I have not done much of anything inside my 314 but I
guess you really need to know what is happening at CRT socket pins 9
& 5
before you can call the CRT bad.
The circuit is a bang-bang it just switches from a low near 0V( blank )
to a high near 100V ( unblank ).
In a normal ( auto trigger ) sweep mode the low pulses should be short.

Please other list members check me up on this since I've been mostly a
software guy since this was built even though I started in electronics
in the late 50s.

Bert


If you are aware of this, just let it go by...
On the 314 blanking is accomplished by a extra deflection plate which

moves the beam off screen.

When blanked the deflection voltages are not relevant.
Bert




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.


Re: Massive document depository-bigger than I thought

Marian Beermann
 

There are also many other vendors in the parent folder:
http://bee.mif.pg.gda.pl/ciasteczkowypotwor/

On 26.12.2015 03:28, Sergey Kubushyn ksi@koi8.net [TekScopes] wrote:


On Fri, 25 Dec 2015, mosaicmerc@yahoo.com [TekScopes] wrote:

110 Gbytes total. It took me something like 36 hours to mirror it.

Does this mean there's more Tek stuff at this link...and the OP only
posted one folder?
http://bee.mif.pg.gda.pl/ciasteczkowypotwor/Tek/
http://bee.mif.pg.gda.pl/ciasteczkowypotwor/Tek/


Re: Plug-ins that use the high power slot in TM500/5000

Mark Wendt
 

On 12/25/2015 11:11 AM, David davidwhess@gmail.com [TekScopes] wrote:
On Fri, 25 Dec 2015 09:11:30 -0500, you wrote:

On 12/24/2015 11:14 AM, David davidwhess@gmail.com [TekScopes] wrote:

David,

That's great news! I've always enjoyed your posts here on the list, and
I really appreciate all the help you gave me on that one plugin that had
me pulling out my remaining hairs while troubleshooting. You should be a
teacher. You'd make a great one.

Mark
Thank you for the kind words.

My desk is starting to look like a medical workstation from a late
20th century version of Frankenstein - medication, gauze pads, medical
adhesive tape, TM504, 2232, 2247, disassembled DC505 and 7603,
soldering iron.
You could always use the soldering iron to cauterize new wounds. ;-)

Mark


Re: Advice for a sick DC505a

mosaicmerc
 

Well, I went thru all the configuration tests, which were fine.

Did the voltage cals etc...everything was in spec.

I calibrated it at a max resolution of 1Hz fed by a 9.999,999 Mhz synth. sinus signal from a newish Rigol 1022A function gen.

So the accuracy is within ±1 count of that sig. or 0.1 ppm . Crosschecked with the Freq counter in the 6.5 digit DMM. I wtached it hold for about 15 min and it's good. Cooling it causes a -1 count, letting it heat with no A/C causes + 1 count.

The hottest components are about +20°C over ambient (30°C)

Phase lock V was well in spec. @2.7V

Ran into a small prob. not having a 'Sealectro' adapter to connect to the A->B out connector in step 7 CH A/B level out cal. Might have to jury rig a paper clip 'probe' to make a squeeze connection to the little male pin inside there. Or try to tap off the PCB with soldered wires.

Later today...too tired now to do that.



.


Re: Advice for a sick DC505a- discovered a mainframe issue as well.

 

On Fri, 25 Dec 2015 20:45:28 -0500, you wrote:



On 12/25/2015 7:12 PM, David davidwhess@gmail.com [TekScopes] wrote:

<snip>

A couple of the 2N3565 transistors in mine were bad and about half
were "soft" on my curve tracer so I replaced them all.

Hello, David--

Thank you for your extended repair suggestions. I'm uncertain what you
mean by the 2N3565s'
"soft" characteristics-- were the V-I curves drifting as the
transistor(s) under test warmed up?
They had poor (high) collector to emitter saturation voltage and poor
(low) collector resistance.

How did the replacements look on the curve tracer, and were the
replacements made by
the same manufacturer as the originals? IIRC, a Fairchild 2N3565 has a
round grayish-colored
bodies topped by a dome of black epoxy. Again IIRC, some 2N3565s are in
conventional TO-92
There was nothing special about the application of these transistors.
I used 2N4401s as replacements but 2N3904s will work and 2N5088s would
be ideal.


Re: Massive document depository

Dwayne Verhey <yg@...>
 

There's one in there about making your own TM-500 extender. Wasn't someone looking for extender info recently?

http://bee.mif.pg.gda.pl/ciasteczkowypotwor/Tek/Make_your_own_Tektronix_TM-500_extender.pdf

On 24/12/2015 10:31 AM, Dave Daniel kc0wjn@gmail.com [TekScopes] wrote:

There is actually a lot more than just Tektronix documents. If one moves
up a couple of levels, one sees directories for many other
manufacturers. Even going up just one level reveals more Tektronix files.

In the Tektronix area, I looked at a file named tek_575_use.pdf, which
was written by Dennis Feucht, who is the author of the excellent
four-volume "Analog Circuit Design" set of books.

DaveD

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