Date   

7104 internal switch

Gary Robert Bosworth
 

I have a Tek 7104 1GHz scope. There is a slide switch inside on the right side on the A13 Logic circuit board and I believe it is labeled S4488. There is no writing next to it, and the manual does not show its purpose. Does anyone know what this switch is used for?


Re: And the winner is my "new" 7A13! Was: 7K series - Conceptual question - What's the 3rd most useful plugin

tom jobe <tomjobe@...>
 

Between yesterday and today I tried making an assortment of tools that might be able to remove the pins from the black plastic block on a 465 that serves as the voltage range selector and fuse block.
In the end, I failed to remove a single pin, and here is the story.
(This will be  explained in inches, using common drill sizes available in the mostly non-metric world I live in)
I machined the tools from brass bar stock and tried various inside and outside dimensions on them.
The outside diameter of the tools could not exceed about 0.126" inches where they fit into the plastic block on the back of the scope, and the inside diameter had to be about 0.102" inches or larger to fit over the pins. The next largest drill in the number drills I have is 0.104" inches and that size hole will clear the pin's outside diameter coming in from the back of the scope very nicely.
A tool with these dimensions will go in about 0.450" inches, and it is not making hard contact with any surface except the bottom of the recess in the black block around the pin. From the front side of the plastic block you can slightly move the pin your tool is on, and there is clearly no hard connection between the tool and the pin.
This made me wonder if the bottom of the recess in the plastic block was a flat surface, so I filed a 'chisel' end on the tool so only the point of the chisel end would touch the bottom in any one place. You can then spin the tool around and feel that the bottom of the 0.126+ recess is quite flat.
When you push any of the tools I made into the bottom of the recess in the plastic block, they never push hard against any surface of the pin, and the pin can be slight moved around in a very loose way from the front side where the wires come into the plastic block.
One person reported being able to take these pins out with a tool they have, perhaps they meant they could do that on some other kind of similar pin?
Another issue after one figures out how to remove these pins, is that some rows of pins are three pins ganged together on the back side, so you would need three tools for those two rows of three pins each.
tom jobe...
PS the larger outside diameter on these pins where the wires come in on the front side of the block is about 0.121" inches as best i could measure in a crowded area.

On 9/28/2018 4:37 PM, tom jobe wrote:
I have been following this discussion, and today took a 4xx scope apart to study what all of you are talking about.
A Google search shows that the tools to remove these kinds of contacts come in many-many sizes and it seems the one closest in size to George's older tool has a 2.7mm hole instead of George's 2.5mm hole. This is addition to any dimensional problems the newer tools have. If the hole in the tool is too large and does not squeeze the spring contact in far enough to release the contact from the hole, that could possibly be Jim's problem?
The holes in the black plastic connector block appear to be very close to 0.125" (1/8th of an inch) which probably will work with the nominal 3.2mm outside diameter the tools are listed as having.
Maybe I will make some test parts on the lathe tomorrow to see what it takes to release those contacts.
tom jobe...

On 9/28/2018 11:21 AM, george edmonds via Groups.Io wrote:
Hi Jim
I have a scrap 4XX scope and have tried to remove the sockets with the extraction tool that I have, it was a simple matter to do so.
Be aware that most of the extraction tools that originate in China are dimensionally poor, at best.
The tool that I have has a spring loaded plunger which you press and the socket just popped out,
The extractor tube dimensions are OD 3.2mm and the ID is 2.5mm , sorry as I have had this tool some 45 years I cannot give you any idea of the manufacturer as it is unmarked.
73 George G6HIG


     On Friday, September 28, 2018 5:24 PM, Jim Olson <v_12eng@...> wrote:

  Fabio,
Sorry I was referring to the 4xx series of scopes and the black main power connector on the back for the fuse and voltage selector jumper. I need to remove the connectors from the connector block there is a tek tool for this but can't find one so bought a pin and socket extractor set as it has the right size for the sockets. It will slide in and feels like it compresses the lock tabs but the socket won't release and slide out. So I wanted to put it to some of the more experienced folks here so anyone know this feel free to jump in I really don't want to cut off the primary wires for the transformer as the sockets are crimped and necessary and most likely hard to find.

Jim

On September 28, 2018 at 6:44 AM Fabio Trevisan <fabio.tr3visan@... mailto:fabio.tr3visan@... > wrote:


     Hello Jim,
     I`m not quite sure abut what equipment you're talking here?
     I saw a post from you about this subject some days ago and, although I don't remember exactly about what equipment it was, I`m confident that if it was about a model that I`m familiar with, it would have grabbed my attention (and maybe I would have even picked a try to answer you).
     Nevertheless... If you let me know the model, I can consult the manuals / pictures and give it my shot...
     If it's an equipment I never had (and I only had a 464 and now this 7623A), my guess will be as good as anyone's but I may be in a good day.
     Rgrds,
     Fabio

     On Thu, Sep 27, 2018 at 12:19 AM, Jim Olson wrote:

     >

         > > Fabio,
         A side question here I need to remove the sockets from the main power
         connector, (fuse block), so got some tubular connector removal tools but when
         I slide it down the socket It feels like it pushes in the release tabs and
         stops but the socket won't pull out.
         So what kind of tool do I need here to get it to release? It's not working
         like I am used to with normal connectors!

         Jim

     >







Re: [Swap] I have 466 manual, looking for 549 manual.

Chip HazTek
 

Hi, Keith. You can email me off-list and we'll arrange the shipping details, OK? Thanks!


Re: [Swap] I have 466 manual, looking for 549 manual.

Keith Knox
 

Hi,
I have a collection of 75 of the Tektronix series 500 oscilloscopes.  8 of these scopes are the type 549. I have also acquired some spare manuals.  I found two spare 549 manuals.  Both are in very good shape.  I also have a 466 oscilloscope, but no manual for this scope.  I have PDF files for most of the Tektronix scopes, but will gladly trade a 549 manual for a 466 manual.
Where should I send the 549 manual?

Keith Knox

On Sunday, September 30, 2018 6:17 AM, David Berlind <david@...> wrote:


I don't have the 549 manual but have a 466 (and no manual to go with it) if
you don't find someone to trade with.

On September 28, 2018 11:19:33 PM "Chip HazTek" <chipartist@...>
wrote:

For some reason when I bought my 549 many years ago, it came with a 466
manual. It's in very good shape physically if a bit musty from
basement-dwelling. I'd like to trade it for a 549 manual if possible. I
know there is a PDF of the 549 manual on the wiki but I do like having the
book(s), call me old-fashioned.


Re: Stan Griffith's Resource Site

bobh@joba.com
 

Archive.org saves the text pages but not the database behind the search pages.

Bob.

On 9/29/2018 6:57 PM, penguin2004au wrote:
Greetings group:
I looked at this site recently, wanting some info about CRT part numbers vs scope models, and found the pages would not respond to my enquiry.
For example entering 545 as a model number resulted in a response "this model was not found in the database"
Does anybody know what has happened and/or can somebody fix the problem?
Regards: penguin2004au



Tektronix 214 repair questions

Harvey White
 

A while back, I picked up a tek 214 at a hamfest. It had been
repaired (!) by someone who was a lot less capable than I'd wish.

The batteries, of course, had leaked. A new set of batteries and new
wiring to the board fixed the problem in the short term. I noticed
that the storage function didn't work as desired, and tracked that
down to a broken function switch. Trying to repair the function
switch worked only partially.

There it sat for a while.

Revisiting the project, I made a major power supply decision and
decided to go with lithium batteries. Running it (for now) off a 12
volt bench supply works, with the current drain 150 to 200 ma in non
storage mode, and about 200 ma in storage mode.

Power supply voltages (all of them) are within tolerance, although I
should check the ripple.

Replaced the function switch with a new one. That fixes the problem
with the switch.

Noticed that channel 2 is fine, while channel 1 has a 1/4 division
sine wave imposed on it. Likely from the inverter (one of them). I'm
suspecting a bad bypass cap unless someone has removed some shielding,
but oddly, only for channel 1. That's just tracking down the signals,
so I can do that relatively easily.

What puzzles me right now is the storage circuitry. Storage mode has
a very low (if any) intensity, and the grid bias is adjusted properly
in non storage mode. I haven't gone through the entire adjustment
procedure because the single trace I'm supposed to get is invisible.
Got as far as setting the operating level control more or less
properly, and that's as far as it went. So, any suggestions?

Now on the battery, I found a single cell (18650) power supply
assembly that goes from that battery or 5 volts USB power (at about 2
amps) to 12 volts. I think it's likely to go into a back addition for
the scope. I had any number of other plans, including a "roll your
own" LiPo supply with inverter, but this is simpler mechanically.

I can still do it if needed and use a different battery. Charging
chip is matched to the LiPo batteries that adafruit sells. Charging
circuitry is based on theirs, with the exact chip, but has an
inverter, regulated power output, and a processor for remote control
and charge state monitoring.

Of course, the probes were removed, so I'll have to put in some BNC
jacks. Fortunately, I have some that were designed with the proper
connections, so it's just a plugin. Case additions will be designed
and 3D printed.

SO....

Storage circuitry and general advice?

Thanks.

Harvey


Re: [Swap] I have 466 manual, looking for 549 manual.

David Berlind
 

I don't have the 549 manual but have a 466 (and no manual to go with it) if you don't find someone to trade with.

On September 28, 2018 11:19:33 PM "Chip HazTek" <chipartist@...> wrote:

For some reason when I bought my 549 many years ago, it came with a 466 manual. It's in very good shape physically if a bit musty from basement-dwelling. I'd like to trade it for a 549 manual if possible. I know there is a PDF of the 549 manual on the wiki but I do like having the book(s), call me old-fashioned.


Re: Stan Griffith's Resource Site

Carsten Bormann
 

On Sep 30, 2018, at 10:18, Adrian <Adrian@...> wrote:

Amazon sellers seem to, I just ordered a used copy without difficulty - albeit at 25 bucks shipping! - to the UK
I’d rather give my money to vintage-TEK…

Grüße, Carsten


Re: 222 battery circuit

Miguel Work
 

My tek 222 is working with lithium


-----Mensaje original-----
De: TekScopes@groups.io [mailto:TekScopes@groups.io] En nombre de tekscopegroup@...
Enviado el: jueves, 27 de septiembre de 2018 16:29
Para: TekScopes@groups.io
Asunto: Re: [TekScopes] 222 battery circuit

Yes I saw that article some time ago. But he is using a separate charging/supplying the battery voltage with a boost converter to the scope, which requires an additional voltage comparator plus inverter logic to control both modules through an enable input, which most charger modules don't have. There are charging modules out there that handle 2 cells with on-board mosfet switching so that only a single connection for the charge input/ battery output is required. That simplifies the design by allowing transparent charge/discharge operation and do away with any external control logic. Anyhow, looked around a bit and ordered a couple of boards to play with.


Re: Stan Griffith's Resource Site

Adrian Nicol
 

Amazon sellers seem to, I just ordered a used copy without difficulty - albeit at 25 bucks shipping! - to the UK

Adrian

On 9/30/2018 8:05 AM, Carsten Bormann wrote:
On Sep 30, 2018, at 06:23, loyde downie<mdownie@...> wrote:
item 112676196038
Doesn’t ship to non-US destinations.


Re: STAN GRIFFITHS IS NOT DEAD, Topic was "Stan Griffith's Resource Site"

Tom Gardner
 

I replied to a message from Dennis Tillman who is in contact with
one of the people, and included that context in my reply.

You chose to reply and *not* to include that context, for reasons
known to yourself.

This sub-thread can serve no further useful purpose.

On 30/09/18 08:35, Craig Sawyers wrote:
Well, there we go then. If not you, who precisely do you suggest picks up the task of either (a)
contacting the original site author or (b) re-creates the data?

Craig

It is conceivable, but I don't like *unnecessarily* reinventing wheels - especially if I make an
elliptical
wheel.

Given the number of other family issues on my plate at the moment, there's no chance I can do it
soon.
in a mail to the the day after it was published.
Since Stan probably laboriously extracted the CRT database information from that document, why
do you not do it and make the information available?


Re: STAN GRIFFITHS IS NOT DEAD, Topic was "Stan Griffith's Resource Site"

Craig Sawyers <c.sawyers@...>
 

Well, there we go then. If not you, who precisely do you suggest picks up the task of either (a)
contacting the original site author or (b) re-creates the data?

Craig

It is conceivable, but I don't like *unnecessarily* reinventing wheels - especially if I make an
elliptical
wheel.

Given the number of other family issues on my plate at the moment, there's no chance I can do it
soon.

in a mail to the the day after it was published.
Since Stan probably laboriously extracted the CRT database information from that document, why
do you not do it and make the information available?


Re: STAN GRIFFITHS IS NOT DEAD, Topic was "Stan Griffith's Resource Site"

Tom Gardner
 

It is conceivable, but I don't like *unnecessarily* reinventing wheels - especially if I make an elliptical wheel.

Given the number of other family issues on my plate at the moment, there's no chance I can do it soon.

On 30/09/18 08:04, Craig Sawyers wrote:
Would it be possible to ask them if they could make available the "database" of information behind
the CRT part numbers vs scope models web page? If entered into a spreadsheet or even a text
document, it would be searchable.

I expect the information is contained in the recently uploaded Tektronix RPR for
154- Vacuum Tubes scan, but that isn't searchable. It might be possible to OCR it, but even if the
characters are recognised correctly, tables are often a problem.
It is indeed included in the that RPR, along with some prices from it that I communicated in a mail to
the the day after it was published. Since Stan probably laboriously extracted the CRT database
information from that document, why do you not do it and make the information available?


Re: Stan Griffith's Resource Site

Carsten Bormann
 

On Sep 30, 2018, at 06:23, loyde downie <mdownie@...> wrote:

item 112676196038
Doesn’t ship to non-US destinations.

Grüße, Carsten


Re: STAN GRIFFITHS IS NOT DEAD, Topic was "Stan Griffith's Resource Site"

Craig Sawyers <c.sawyers@...>
 

Would it be possible to ask them if they could make available the "database" of information behind
the CRT part numbers vs scope models web page? If entered into a spreadsheet or even a text
document, it would be searchable.

I expect the information is contained in the recently uploaded Tektronix RPR for
154- Vacuum Tubes scan, but that isn't searchable. It might be possible to OCR it, but even if the
characters are recognised correctly, tables are often a problem.
It is indeed included in the that RPR, along with some prices from it that I communicated in a mail to
the the day after it was published. Since Stan probably laboriously extracted the CRT database
information from that document, why do you not do it and make the information available?

Craig


Re: STAN GRIFFITHS IS NOT DEAD, Topic was "Stan Griffith's Resource Site"

Tom Gardner
 

Would it be possible to ask them if they could make available the "database" of information behind the CRT part numbers vs scope models web page? If entered into a spreadsheet or even a text document, it would be searchable.

I expect the information is contained in the recently uploaded Tektronix RPR for 154- Vacuum Tubes scan, but that isn't searchable. It might be possible to OCR it, but even if the characters are recognised correctly, tables are often a problem.

On 30/09/18 06:28, Dennis Tillman W7PF wrote:
Malcom,

Where did you get this mis-information???

I was at his house and had a fine talk with him 3 weeks ago. He looked pretty alive then. He walked, he talked, and I saw him eat some food. Those are behaviors that are usually not associated with the dead.

Kurt Rosenfeld was there on Friday and Stan sold Kurt a Tek 537 scope. That is definitely not the behavior of a dead man. An interesting detail about the 537: it isn't listed in any Tek Catalog.

I am on the Ex-Tek email reflector. The "Ex" in Ex-Tek indicates they are "no longer a Tek Employee", and does NOT mean they are deceased. My best Ex-Tek friend does the obituaries for the Ex-Tek reflectors (there are two) and he has heard nothing about Stan's passing. He will call Stan tomorrow. I will see him a little later.

The web site that was referred to as Stan's was actually a collaboration between Stan and Bill Den Beste and Bill did the technical end of it. I believe it is Bill that lost interest in maintaining the web site.

Dennis Tillman W7PF

-----Original Message-----
From: TekScopes@groups.io [mailto:TekScopes@groups.io] On Behalf Of
Malcolm S
Sent: Saturday, September 29, 2018 7:23 PM
Subject: Re: [TekScopes] Stan Griffith's Resource Site

Regrettably, Stan Griffiths has passed on, and last I checked there is no
one managing his site or email. My understanding from what I've read is
that he was considered quite the powerhouse at Tektronix. He later
published a book called "Restoring a Classic" (That is not the full title,
and the book is sadly not easy to find anyway) as a sort of DIY repair
guide for earlier Tek models. You might check archive.org as a way of
looking up pages on his site that have been periodically stored over the
years. If anyone has related information to scans of the book available, I
would also be interested, as I have only seen pictures of it.

On Sat, Sep 29, 2018 at 8:57 PM penguin2004au <clansman2011@...>
wrote:

Greetings group:
I looked at this site recently, wanting some
info about CRT part numbers vs scope models, and found the pages would
not respond to my enquiry.
For example entering 545 as a model number
resulted in a response "this model was not found in the database"
Does anybody know what has happened and/or can
somebody fix the problem?
Regards: penguin2004au


STAN GRIFFITHS IS NOT DEAD, Topic was "Stan Griffith's Resource Site"

 

Malcom,

Where did you get this mis-information???

I was at his house and had a fine talk with him 3 weeks ago. He looked pretty alive then. He walked, he talked, and I saw him eat some food. Those are behaviors that are usually not associated with the dead.

Kurt Rosenfeld was there on Friday and Stan sold Kurt a Tek 537 scope. That is definitely not the behavior of a dead man. An interesting detail about the 537: it isn't listed in any Tek Catalog.

I am on the Ex-Tek email reflector. The "Ex" in Ex-Tek indicates they are "no longer a Tek Employee", and does NOT mean they are deceased. My best Ex-Tek friend does the obituaries for the Ex-Tek reflectors (there are two) and he has heard nothing about Stan's passing. He will call Stan tomorrow. I will see him a little later.

The web site that was referred to as Stan's was actually a collaboration between Stan and Bill Den Beste and Bill did the technical end of it. I believe it is Bill that lost interest in maintaining the web site.

Dennis Tillman W7PF

-----Original Message-----
From: TekScopes@groups.io [mailto:TekScopes@groups.io] On Behalf Of
Malcolm S
Sent: Saturday, September 29, 2018 7:23 PM
Subject: Re: [TekScopes] Stan Griffith's Resource Site

Regrettably, Stan Griffiths has passed on, and last I checked there is no
one managing his site or email. My understanding from what I've read is
that he was considered quite the powerhouse at Tektronix. He later
published a book called "Restoring a Classic" (That is not the full title,
and the book is sadly not easy to find anyway) as a sort of DIY repair
guide for earlier Tek models. You might check archive.org as a way of
looking up pages on his site that have been periodically stored over the
years. If anyone has related information to scans of the book available, I
would also be interested, as I have only seen pictures of it.

On Sat, Sep 29, 2018 at 8:57 PM penguin2004au <clansman2011@...>
wrote:

Greetings group:
I looked at this site recently, wanting some
info about CRT part numbers vs scope models, and found the pages would
not respond to my enquiry.
For example entering 545 as a model number
resulted in a response "this model was not found in the database"
Does anybody know what has happened and/or can
somebody fix the problem?
Regards: penguin2004au



--
Dennis Tillman W7PF
TekScopes Moderator


Re: Stan Griffith's Resource Site

mike downie
 

just an fyi, but the book is avail on epay....

item 112676196038

full title:

Oscilloscopes: Selecting and Restoring a Classic by Stan Griffiths



got nothing to do with this auction - just did a search...

------

also on amazon

https://www.amazon.com/Oscilloscopes-Selecting-Restoring-Stanley-Griffiths/dp/0963307150


m downie


Re: Stan Griffith's Resource Site

 

He is NOT DEAD!!!!!! He is very well and alive!!!!! One should NOT speak out of turn and pass such rumors.

On Sep 29, 2018, at 11:02 PM, Craig Cramb <electronixtoolbox@...> wrote:

Yes it’s a sad day. He definitely was a early leader in information and parts supply. As time moves on we all will meet this demise. So always help and share information to all interested members.



Re: Stan Griffith's Resource Site

Craig Cramb
 

Yes it’s a sad day. He definitely was a early leader in information and parts supply. As time moves on we all will meet this demise. So always help and share information to all interested members.

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