Date   

Re: 5116+5D10 intensity problem

Yeun-Jung Wu
 

BTW +-30V. 200V and 5V all were within spec. Haven't checked their ripple content yet.


5116+5D10 intensity problem

Yeun-Jung Wu
 

Hello:

Today I dig out my 5116+5D10 to display signal from FG501 and FG501A. I used "channal addition" to display added signal from two oscillators tuned to nearly 7kHz sine wave. At equal amplitude the expected envelope was beautifully displayed on the screen. Switch to X-Y mode display a dotted Lissajous pattern. Read out and cursor all function as expected.

After operation about one and a half hour the intensity gradually decay. It was accompanied by the expansion of horizontal and vertical graticutes. Now one dotted horizontal and vertical division expanded to include four real inner CRT divisions. Read out information was pushed outside of screen. Pushing the "Beam finder" button display a image filled out the entire screen (save + Power on), instead of a scaled down version of display. The intensity of the pattern was barely visible. Weak wave forms were still displayed on the screen; mostly with a red LED warning: possible under-sampling.

I had tried to adjust intensity range R245 on A3 board with little effect.

Should I go further to poke the wave forms at 21 and 26A/B? Was the problem in Z-axis amp or HV (pin 2 of CRT socket)?
Q222, Q234, Q226 all located in a hard to reached region so I had not checked their status yet.

Any suggestions? Thank you in advance.

Yeun-Jung Wu


Re: 2465B Option 05 + 06 (TV/CTT)

@app41
 

Hello Chuck,

You're right, there is one ASIC but I can find it on ebay.
Actually the main problem is the crystal, its frequency is 13.10669MHz, I can't find one.

I'd love to buy another 2465B but they are difficult to find in Europe, and if I buy an oscilloscope from the USA I need to add about 250 USD for shipping and tax...
That's why I'm looking for cheaper (and lighter !) boards :)


Guillaume


Wondering if there is any out there

Eric
 

I need Tek part number 261-0197-01 this is the variable high voltage loping Capacitor in a fixture 177. Or if anyone know of an equivalent replacement for it? It is C630 In the fixture


Re: Was 7633 is disassembled now 7603 alpha numeric card available?

John Corini
 

Bill,

Let me check this weekend to see what boards I have. I think I have a 7603
that may have that board. I will let you know.

John

On Thu, Feb 13, 2020 at 8:10 PM Bill (Doc) Courtright via Groups.Io <doxemf=
aol.com@groups.io> wrote:

John,Looking for the 7603 display card. Quite awhile ago I transplanted it
to a friends military version thinking mine was unrepairable. But it was
not. I read on here awhile back that different models of scope had
different cards and were not interchangeable otherwise have a couple other
7K scrappers. If still available let me know the cost and shipping to
01247.Thanks,Bill


-----Original Message-----
From: John Corini <john.corini@...>
To: TekScopes <TekScopes@groups.io>
Sent: Thu, Feb 13, 2020 4:14 pm
Subject: Re: [TekScopes] 7633 is disassembled -- want any parts, CRT? not
known to work at all

Steve,
I don't think I have that scope any longer, but I do have other tek scopes
for parts. I know that a 7603 and a 7404 for parts.
73 - Jihn






Was 7633 is disassembled now 7603 alpha numeric card available?

Bill (Doc) Courtright
 

John,Looking for the 7603 display card. Quite awhile ago I transplanted it to a friends military version thinking mine was unrepairable. But it was not. I read on here awhile back that different models of scope had different cards and were not interchangeable otherwise have a couple other 7K scrappers.  If still available let me know the cost and shipping to 01247.Thanks,Bill

-----Original Message-----
From: John Corini <john.corini@...>
To: TekScopes <TekScopes@groups.io>
Sent: Thu, Feb 13, 2020 4:14 pm
Subject: Re: [TekScopes] 7633 is disassembled -- want any parts, CRT? not known to work at all

Steve,
I don't think I have that scope any longer, but I do have other tek scopes
for parts.  I know that a 7603 and a 7404 for parts.
73 - Jihn


Re: TM500/TM5000 extender project

Ke-Fong Lin
 

Hi everyone,

For strain-relieve, I've consider it but:
* this will make the PCB bigger however that's not so much of a problem;
* the solder sides will be at the back, whereas front side, the pads act like touch points;
* the extender is for hobby use (repair/calibration), probably only during week-ends, not intensive professional use.

Regarding the 7 connectors, they're standard 2.54mm (.1in) Molex connectors. Readily available at Mouser and Farnell.
There are cheaper alternatives at Tayda electronics or even aliexpress.
If you don't plan to do debugging without mainframes, then none of the extra circuitry is needed.
I'll write a small README along with a proposed BOM.

As for the power good (PWR) high TTL output, it is intended only for TM500x modules which expect regulated 8VDC.
The markings on PCB specify the regulated TM500x voltages.
TM500 supplies filtered but regulated voltages, tolerance of +7.6V (fully loaded) up to +16V!
It is not a problem as these older modules don't use PWR. But it draws around 2-3mA.
In fact, some TM500x modules (AA5001 for example) don't even check PWR when they should.

Best regards,


Re: 7633 is disassembled -- want any parts, CRT? not known to work at all

John Corini
 

Steve,
I don't think I have that scope any longer, but I do have other tek scopes
for parts. I know that a 7603 and a 7404 for parts.
73 - Jihn

On Thu, Feb 13, 2020, 3:32 PM StefanS <ssans@...> wrote:

Hello John,
I would like to buy the main interface board - with the connectors to the
plugins. I am in urgend need of the plastic covers for my 7704.
Please answer me with details to ssans <at> freenet <dot> de, if you are
willing ship to Gemany.
Thank you in advance.

--
Stefan




Re: 2215 cleaning + recap

guy232
 

Just checked the 2215 sm, it should have 6 screws total removed. You pop
the shield out by pulling upwards on the right rear corner of the shield.
There are some little slots in the chasis that the shield slips into, you
can see it in my previous post's picture at the rear top left of the shield
by the ground sticker. If its just barely wiggling and not easily popping
free maybe take a flash light and double check that you removed the correct
two screws on the rear chasis.

On Thu, Feb 13, 2020, 3:07 PM guy232 via Groups.Io <gry.russel=
gmail.com@groups.io> wrote:

Did ya get the screw hiding under the chasis rail circled here?

https://imgur.com/a/O81VEZN




Re: 7633 is disassembled -- want any parts, CRT? not known to work at all

StefanS
 

Hello John,
I would like to buy the main interface board - with the connectors to the plugins. I am in urgend need of the plastic covers for my 7704.
Please answer me with details to ssans <at> freenet <dot> de, if you are willing ship to Gemany.
Thank you in advance.

--
Stefan


Re: 2215 cleaning + recap

guy232
 

Did ya get the screw hiding under the chasis rail circled here?

https://imgur.com/a/O81VEZN


Re: 2465B Option 05 + 06 (TV/CTT)

Chuck Harris
 

You missed the custom ASICs that do all the counter timer
work.

It would be far cheaper to buy another 2465B that has the
options you want.

-Chuck Harris

@app41 wrote:

Hello all,

I own a Tek 2465B and I like it a lot :)
I started digging the web to find options boards but after having bought a TV option 05 I discovered it was the same board as the CTT, but only with components for the TV option.
Since I can't find a TV/CTT board on the web, I wonder if it would be possible to populate the board with missing components, to recreate the CTT option ?
Seems to be standards parts ; I would need only dump of EEPROM of someone owning these options. Did I miss something ?

What do you think about that ? If you have a TV+CTT option to sell, please tell me :)

Guillaume




2465B Option 05 + 06 (TV/CTT)

@app41
 

Hello all,

I own a Tek 2465B and I like it a lot :)
I started digging the web to find options boards but after having bought a TV option 05 I discovered it was the same board as the CTT, but only with components for the TV option.
Since I can't find a TV/CTT board on the web, I wonder if it would be possible to populate the board with missing components, to recreate the CTT option ?
Seems to be standards parts ; I would need only dump of EEPROM of someone owning these options. Did I miss something ?

What do you think about that ? If you have a TV+CTT option to sell, please tell me :)

Guillaume


Re: 7633 is disassembled -- want any parts, CRT? not known to work at all

Randy Newman
 

Do you happen to have the horizontal board? My 7633 has flaky horizontal ( short trace) which I fixed, but recently went to No trace.


Re: New member and my story

Randy Newman
 

Hi Tim:
Rickreall hamfest....wow.....I lived not far from there growing up. Now live further north in Washington state. I happen to have 4 Tek scopes: 7834, 7633, 7623, and a fine 555 ( with 2 CAs, D, W, and 1A7). Plus various other items from Fluke, HP, Keithley, Systron Donner, Analogic, etc.
Are you still involved in this forum?
Best wishes in Tek land.


firmware 2465B

bittau@...
 

Hi Group, I am looking for the 160-5370-11 and 160-5371-11 the firmware for 2465B (below B05xxxx), does anyone has this image binary file? Thanks in advance Claudio


2215 cleaning + recap

ridderg@...
 

Hi all, I’ve recently bought a used, somewhat beat up but functional 2215. The trace sometimes shifts vertically, probably due to dirty switches. The plan is to clean some of the switches and replace all PSU caps.

I’ve started disassembly but am currently blocked as the HV shield seems stuck. I’ve removed all screws as indicated in the service manual (which in itself was a pain as a couple of screws were worn out). The shield can be wiggled but seems stuck at the right side somewhere (looking from the front).

Did I miss anything or should I just apply more force? Any tips would be appreciated. Thanks!


Re: TM500/TM5000 extender project

Arie de Muijnck
 

Add a pin 1 marker (small triangle)  to J4...J10. It might same someone a lot of trouble.

If +8_11.5VDC is max 11.5VDC then the voltage on TTL_HIGH can be max 7V, way too high for TTL.
Better use a 5.6V zener instead of R2.

Regards,
Arie

On 2020-02-12 23:20, Ke-Fong Lin wrote:


Hi everyone,

The PCB is ready! I've updated the preview and the
schematics.

https://drive.google.com/file/d/14WSoPeQoIwup4532_YnxUz44PVxAYJ8T/view
https://drive.google.com/file/d/1E7RxXXPg_3-Kwd652mFbe5g-4zoBeAN_/view

In
particular, I've added a small circuitry to generate the "power good
signal" for the TM5000 modules.
It's basically a voltage divider from 8V
to 5V, and an NPN buffer. The PWR specifies a full load (16mA) of TTL high
(+5V).
A small drawback is that it always draws around 2-3mA even if not
to needed (inserted in a mainframe).

Can some of you do a review of the
schematic? Or give some comments or suggestions?
For those really curious,
I can send the complete kicad project, just ask. Final version will be an
github of course.
For a pure extender use, there is just some wiring to be
done. Otherwise, I'll have to provide some sort of BOM.
I also have to
write a small "documentation".

Plan is to send the PCB to fabrication
(JLPCB) this week-end, after feedbacks.

Best regards,


Re: 11301/11302 in the Bay area

Jerry
 

I bought a stationwagon-load of Tektronix and HP specific caps, mostly, but a lot of transistors and preformed resistors from a guy last year or so. He was servicing scopes, I guess. In the box was a curve tracer that's available still on ebay and for the heck of it, I tried it out and it did a fairly decent job on small transistors. You can find it on ebay by searching for "curve tracer" and looking for a bag of parts that cost around $25. I also have a Mini-CT I built that was in QST a while back but this simple current step circuit works pretty well. YAou need an analog scope to use it effectively. The trace is best at 500us per division. The persistence on my 3054B does a decent tds784 and DSA602, 2440, and others won't show a trace. I used my Mini Ct recently to match transistors for a mixer but i could have used this other circuit.

Jerry


Re: 11301/11302 in the Bay area

John Griessen
 

On 2/12/20 2:09 PM, Jerry wrote:
The other thing I wanted an analog scope for was doing semiconductor curves. I have a couple of circuits (not the octopus type) that do a pretty good job of displaying curves.
So, what speed are you tracing I-V curves, and how different from octopus circuits of old?