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On 2018-04-04 8:31 AM, Chuck Harris wrote:

You all are going to a lot of work to save calibration
data that ceased to be relevant probably more than a
decade ago.

If the scope had something important, like firmware,
stored in the NVRAM I could see spending the effort,
but what you are talking about doing is surprisingly
similar to looking for ways to change a new fender
into a dented and rusted out duplicate of the old
fender on your car... so you can replace the old
fender...

I think this is an excellent point, but are calibration procedures
documented and possible for end users?

--Toby

(I haven't looked into that question yet, but I do own a TDS460A &
others that are pre-digital)

-Chuck Harris

Claimer: I trade in discount calibrations, so my opinions
are clearly biased in favor of doing calibrations...

ADas via Groups.Io wrote:

HI MIcro,
Yes i soldered temporary wires between pin 1 and 2 of cpu. The cpu is 6802 on all the tek 246x oscilloscopes despite the label "sc67127p". Dont be afraid the cpu assisted copy of data is much less likely to go wrong then if you desoldered the old nvram and then tried reading it, which often fails..
Cheers
Das

You all are going to a lot of work to save calibration
data that ceased to be relevant probably more than a
decade ago.

If the scope had something important, like firmware,
stored in the NVRAM I could see spending the effort,
but what you are talking about doing is surprisingly
similar to looking for ways to change a new fender
into a dented and rusted out duplicate of the old
fender on your car... so you can replace the old
fender...

-Chuck Harris

Claimer: I trade in discount calibrations, so my opinions
are clearly biased in favor of doing calibrations...

ADas via Groups.Io wrote:

On 04/04/2018 02:15 AM, Dave Voorhis wrote:

In the technical and scientific world, there is only one choice: LaTeX.

Everything else is a toy or waaay too much hard work. Creating professional documents with most desktop publishing or word processing software is like building houses from toothpicks and plasticine. LaTeX is like handing a blueprint to professional builders.

Given the way LaTeX works, vi is fine if that's what you prefer, though obviously Emacs is a better choice. :-)

(Of course, LaTeX is available online these days, so no need to install a LaTeX toolchain. See overleaf.com)

Emacs isn't always available you're recovering a machine and it may have partitions not available.? Emacs is good for progamming (xemacs is even better), but I still prefer vi for doing system tasks.

Mark

On 04/03/2018 10:09 PM, Fabio Trevisan wrote:

Folks!
VI... Ouch!That is the lamest of the Text editors. I know that lots of
folks here will shout at me, saying that it's perfect!
I can even acknowledge... as we know that when someone gets used to any
command line interface that it kills any GUI but... c'mon!
Well, I`m a dinosaur, and even me could never get used to THAT! command
line interface!

I have used Ventura Publisher (was fine) and Page Maker (Very good), but
those were really pro tools, meant for people who worked on the Print Shops
and serious graphical publishing.
They were meant for people who would import the raw text (typed as plain
text) and then would apply, in a structured way, all the formatting and
styling templates.
When done this way, you would see their advantage, but when one would just
jump at it to do a one time work... It was even worse than Word.
Word, despite coming from the evil MS, does quite a decent job at doing, at
once, text editting AND Desktop Publishing.

I never tried in a more involved fashion, but I think that any Open License
Text editor of nowadays, like Star Office or Libre-Office, probably do a
good job as much as Word.

Rgrds,

Fabio

Fabio,

That was typed tongue-in-cheek as an answer to a document writer. However...? I was a unix/linux/VMS sysadmin for nigh on 30 years. And vi was my go to text editor for all those years when programming, writing scripts and those kinds of things.? No, it doesn't give you the GUI stuff that the modern word processors have, but when all you have is a command line access to a server, it probably is one of the best text editors for those kinds of purposes.? Once you get used to the ins and outs of all the commands, it's a pretty powerful text editor.

Mark

HI MIcro,
Yes i soldered temporary wires between pin 1 and 2 of cpu. The cpu is 6802 on all the tek 246x oscilloscopes despite the label "sc67127p". Dont be afraid the cpu assisted copy of data is much less likely to go wrong then if you desoldered the old nvram and then tried reading it, which often fails..
Cheers
Das

Ciao Das thanks for the reply.

Maybe we can succeed in the adventure with your great help

Now the procedure is more clearer to me.
My cpu is SC67127p may be fine anyway ? is same 6802 ?
The jumper between pins 1 and 2 on Cpu I do it with 2 wires or a metal tip ?
I also ask if the procedure is invasive
if I destroy something or not.

thank for collaboration

ciao mirco

I mourn the loss of Ventura Publisher - to this day I'm convinced there's no better tool for writing large manuals.

David

Hi, thanks all for the replies.

Les, according to the article in TekTalk, the 'Serviscope' name had been in production from some time after 1954 until the Telequipment range got a facelift in '58 to make it more attractive to the American market.

Jim, thanks for that link, through it I found a Wireless World of Sept 1957 with report on companies attending the National Radio Show in '57 and on p421/422? Telequipment is listed together with a picture that matches this 'scope exactly. It is simply referred to as 'a new portable calibrated Serviscope' with no model number.

Chris, thanks and I took your advice and posted on the Vintage Radio forum - we'll see if anyone bites!

I guess this all ties up - so far at least - and if my interpretation of the serial number is correct it would be one of the last produced in this style and perhaps the S31 model number got applied to the restyled version?

Thanks for all the help/interest folks.

Adrian

In the technical and scientific world, there is only one choice: LaTeX.

Everything else is a toy or waaay too much hard work. Creating professional documents with most desktop publishing or word processing software is like building houses from toothpicks and plasticine. LaTeX is like handing a blueprint to professional builders.

Given the way LaTeX works, vi is fine if that's what you prefer, though obviously Emacs is a better choice. :-)

(Of course, LaTeX is available online these days, so no need to install a LaTeX toolchain. See overleaf.com)

I have had the two sizes shown on the right side for so long and used
the 1/4 watt lead bender so much that the plastic slots are worn. Mine
are almost as old as my Weller soldering gun.

The 2N6545 (8 amp 125 watt) is the general purpose replacement for
transistors in that series and is still produced. These can probably
be found cheap somewhere.

I am not sure where you found the MJ13015 part number but I suspect
the 10 amp 150 watt Motorola part is basically the same thing with
some refinements and tighter specifications. Motorola had a habit of
producing parts like this to cater to specific applications. They
probably have an application note for it.

The 7000 mainframes through the 7904 use the 5 amp and 110 watt 2N6308
and the 7844 uses the -01 part which is graded for Toff > 3us for some
reason. I have not gotten to tracking down the later ones yet.

It will be important to make sure transistor failure was not caused
externally. Possibly this is just a case of one dying and taking the
other out.

Hi Lop Pol,

If all the voltages are proportionately high then the Voltage jumper on the back panel or inside the TM504 (it's in a different place on each mainframe model) is set too low for your mains voltage. Check your mains voltage with an RMS meter and set the jumper to LOW, MED, or HIGH accordingly.

If only the 11.4V is high the jumper setting isn't the cause.

Dennis Tillman W7PF

Hi Craig,
That list is dated 2009. As such it is out of date and incomplete. New items
were being added on a regular basis at that time. Kurt at TekWiki has my
most recent list. At this point the list doesn't change very often because
there are very few plugins I haven't found by now.

I am not sure how Kurt intends to use the list, but I left that up to him
since he had his own ideas how to best fit the information it contained into
TekWiki.

For many of the most unusual plugins, when they appeared in an Ebay auction
with pictures, I captured those pictures into a separate Word document for
each plugin. I have forwarded those pictures onto Kurt as well. I think, but
I am not sure, Kurt has created a separate web page for each of the plugins
from my list with pictures where I had them.

I have complete confidence in Kurt to do what he feels best with the
information in my TM500/TM5000 list. I think Kurt is busy lately working on
another comprehensive list I gave him of Tek 7000 series plugins and
accessories. The principal difference between my TM500/TM5000 list and my
7000 list is that there were far too many TM500/TM5000 plugins to collect.
Not so with the 7000 series plugins.

I have the complete collection of Tek 7000 plugins including all but a very
few extremely rare calibration fixtures, and a few of the Personality
Modules for the 7D02 that are extremely rare. I also have more than a few
7000 prototypes which never went into production for one reason or another.
And finally I have about a dozen production 7000 plugins made by companies
other than Tektronix.

What I do not have room for are all of the 7000 mainframes. But there is a
collection of every 7000 mainframe Tek ever made. It belongs to my friend
Rens Tel in Holland, and if I do say so, it is breathtaking.

Dennis Tillman W7PF

Folks!
VI... Ouch!That is the lamest of the Text editors. I know that lots of
folks here will shout at me, saying that it's perfect!
I can even acknowledge... as we know that when someone gets used to any
command line interface that it kills any GUI but... c'mon!
Well, I`m a dinosaur, and even me could never get used to THAT! command
line interface!

I have used Ventura Publisher (was fine) and Page Maker (Very good), but
those were really pro tools, meant for people who worked on the Print Shops
and serious graphical publishing.
They were meant for people who would import the raw text (typed as plain
text) and then would apply, in a structured way, all the formatting and
styling templates.
When done this way, you would see their advantage, but when one would just
jump at it to do a one time work... It was even worse than Word.
Word, despite coming from the evil MS, does quite a decent job at doing, at
once, text editting AND Desktop Publishing.

I never tried in a more involved fashion, but I think that any Open License
Text editor of nowadays, like Star Office or Libre-Office, probably do a
good job as much as Word.

Rgrds,

Fabio




2018-04-03 22:08 GMT-03:00 Mark Wendt <wendt.mark@...>:

Thanks chuck :)

There are desktop publishers and there are desk top publishers...what are you mainly planning on doing? More? clean up scans like the 1S1 or write a book? Is your personal time valuable ( i.e. are you willing to spend money on software that makes the task easier and faster)

-DC
manuals@...

--
Dave
Manuals@...
www.ArtekManuals.com

I want to thank EVERYONE. Wow. I'm operating above my pay-grade working on these and between the manual (theory of operation) and your suggestions I will be awhile understanding what's going on. At least a little bit. But then that's why I enjoy this it's a learning exercise. I have some specific tech questions but want to mull things over some more and will ask in a new thread with an appropriate subject.

I actually have two 485 both inop. Both blew fuses but the other stopped with replacement of the big caps; this one obviously is still not happy. I think I'm going to button this one up for now (I'm short on space) and focus on the other.

Just for future Googlers:

2N6308 is listed obsolete and not in stock at Digikey or Mouser; but TEDSS.com has them reasonable and they're all over eBay. TEDDS sometimes has stuff and I've had good service. I may get a handful cause they're cheap and apparently oem so how bad can they be.
BU208A is listed obsolete if at all and not in stock but also eBay and plentiful.

So thanks again. I'll jot this all down in the notebook and be back with questions on the 'at least it don't blow the fuse up' scope after more book study.

On Tue, Apr 3, 2018, 21:04 snapdiode via Groups.Io <snapdiode=
[email protected]> wrote:

Well he agreed to attribute it to me. I guess that settles whether it s my
PDF or not.
I'm not looking for money, but I did it with Word. Word!

BTW if anyone can suggest a better tool to "Desktop publish" (remember
when that was the killer app?) I'd love hear it.

vi? ;-)

Mark

Well he agreed to attribute it to me. I guess that settles whether it s my PDF or not.
I'm not looking for money, but I did it with Word. Word!

BTW if anyone can suggest a better tool to "Desktop publish" (remember when that was the killer app?) I'd love to hear it.

This is normal behavior.

The 11.4V is an unregulated supply, and is
expected to be high when unloaded, and to be
about 11.4V when fully loaded, and at the
minimum power line voltage.

-Chuck Harris

lop pol via Groups.Io wrote: