Date   
Re: Correct Silver solder

Jamie Ostrowski
 

60% tin/ 37% lead, and 3% SILVER...sorry for the typo!

On Fri, Nov 1, 2019 at 9:49 PM Jamie Ostrowski <jamie.ostrowski@...>
wrote:


Tektronix in the 50's said the actual correct solder is 60% tin, 37% lead,
and 3% solder. The details are highlighted in this video, made in the 50s
by Tektronix, for soldering to ceramic strips.

Here is the video which covers the procedure in detail:

https://www.youtube.com/watch?v=RpB5JqGo1co

Maybe 2% would work, but if you're working on restoring a 555, why take
the chance on compromise?

Just me! :-)

Good luck with your project.



On Fri, Nov 1, 2019 at 9:26 PM Richard R. Pope <mechanic_2@...>
wrote:

Bruce,
I would use the same solder that the original builders used. 60/40
or 63/37 lead/tin rosin core solder.
GOD Bless and Thanks,
rich!

On 11/1/2019 9:08 PM, greenboxmaven via Groups.Io wrote:
I am beginning restoration on a 555 I got a few months ago. What is
the correct alloy of solder for the ceramic tie strips? I have found
both tin/lead/silver and lead-free, both with 2% silver content . Are
these satisfactory? Is 2% silver enough, or is a richer alloy needed?
Thanks, Bruce, KA2IVY







Re: Correct Silver solder

Jamie Ostrowski
 

Tektronix in the 50's said the actual correct solder is 60% tin, 37% lead,
and 3% solder. The details are highlighted in this video, made in the 50s
by Tektronix, for soldering to ceramic strips.

Here is the video which covers the procedure in detail:

https://www.youtube.com/watch?v=RpB5JqGo1co

Maybe 2% would work, but if you're working on restoring a 555, why take the
chance on compromise?

Just me! :-)

Good luck with your project.



On Fri, Nov 1, 2019 at 9:26 PM Richard R. Pope <mechanic_2@...>
wrote:

Bruce,
I would use the same solder that the original builders used. 60/40
or 63/37 lead/tin rosin core solder.
GOD Bless and Thanks,
rich!

On 11/1/2019 9:08 PM, greenboxmaven via Groups.Io wrote:
I am beginning restoration on a 555 I got a few months ago. What is
the correct alloy of solder for the ceramic tie strips? I have found
both tin/lead/silver and lead-free, both with 2% silver content . Are
these satisfactory? Is 2% silver enough, or is a richer alloy needed?
Thanks, Bruce, KA2IVY







Re: Correct Silver solder

Richard R. Pope
 

Bruce,
I would use the same solder that the original builders used. 60/40 or 63/37 lead/tin rosin core solder.
GOD Bless and Thanks,
rich!

On 11/1/2019 9:08 PM, greenboxmaven via Groups.Io wrote:
I am beginning restoration on a 555 I got a few months ago. What is the correct alloy of solder for the ceramic tie strips? I have found both tin/lead/silver and lead-free, both with 2% silver content . Are these satisfactory? Is 2% silver enough, or is a richer alloy needed? Thanks, Bruce, KA2IVY



Re: Correct Silver solder

Bob Albert
 

I think 2% is okay, with lead preferred since that's what they used.
In my case, I found a piece of silver solder my dad had for his jewelry repairs and using some of it alternately with tin-lead seems to do the job for the terminal strips.  So apparently the fraction isn't critical.
Bob

On Friday, November 1, 2019, 07:11:24 PM PDT, greenboxmaven via Groups.Io <ka2ivy=verizon.net@groups.io> wrote:

I am beginning restoration on a 555 I got a few months ago. What is the
correct alloy of solder for the ceramic tie strips?  I have found both
tin/lead/silver and lead-free, both with 2% silver content .  Are these
satisfactory?  Is 2% silver enough, or is a richer alloy needed? Thanks,
Bruce, KA2IVY

Correct Silver solder

greenboxmaven
 

I am beginning restoration on a 555 I got a few months ago. What is the correct alloy of solder for the ceramic tie strips? I have found both tin/lead/silver and lead-free, both with 2% silver content . Are these satisfactory? Is 2% silver enough, or is a richer alloy needed? Thanks, Bruce, KA2IVY

Re: A few pics from a new-to-me exhibit in the National Museum of Nuclear Science and History

J Mcvein
 

Put on your Atomic Age bucket list a visit to the Hanford 'B'reactor.  Some vintage Tek in a 1968 time capsule.  Also themost extensive thermocouple crosspoint switching system around.
JimMc

On Friday, November 1, 2019, 4:28:12 PM PDT, sdturne@q.com <sdturne@q.com> wrote:

https://groups.io/g/TekScopes/album?id=128766

The exhibit depicts the critical assembly labs that operated at Los Alamos Scientific Laboratory (now Los Alamos National Laboratory). The scientists who worked in them (rather bravely I might add) were working to quantify critical masses of plutonium. A number of fatal criticality accidents occurred in the years these experiments were carried out. Robotic assembly was developed later, with the scientists safely shielded.

Anyway, there's a selection of vintage test equipment that members of the list may enjoy, mainly a 535 and a DuMont oscillograph. Most of the stuff in the exhibit is authentic, ex LANL gear. Other than the criticality experiments.

Sean

A few pics from a new-to-me exhibit in the National Museum of Nuclear Science and History

@0culus
 

https://groups.io/g/TekScopes/album?id=128766

The exhibit depicts the critical assembly labs that operated at Los Alamos Scientific Laboratory (now Los Alamos National Laboratory). The scientists who worked in them (rather bravely I might add) were working to quantify critical masses of plutonium. A number of fatal criticality accidents occurred in the years these experiments were carried out. Robotic assembly was developed later, with the scientists safely shielded.

Anyway, there's a selection of vintage test equipment that members of the list may enjoy, mainly a 535 and a DuMont oscillograph. Most of the stuff in the exhibit is authentic, ex LANL gear. Other than the criticality experiments.

Sean

Re: 468 With Odd Trace Timing issue when in Vertical ALT Mode Only.

Mlynch001
 

Link for the Photos of the traces in question.

https://groups.io/g/TekScopes/album?id=127536

Anyone with Ideas or suggestions would be appreciated.

Feel free to question me about this issue.

THANKS!

--
Michael Lynch
Dardanelle, AR

Re: Tektronix 222 mini scope repair, looking for schematics

satbeginner
 

Hi, I was a bit confused, because after I assembled the scope again and got two full traces, the self cal repeatedly failed on both channels.
Before my cleaning of the pcb it completed almost every time with a pass.

When I changed to Storage Mode the self cal on both channels completed with a Pass.

Will continue to test.

In saludo, Leo

Re: "liquid crystal driver" sighting

Magic_Smoke
 

https://www.davmar.org/TE/Tillman/TM500-Tillman.html lists it as "Unknown manucturer." Who knew this topic would be so exciting? I'm on the edge of my seat!

Re: Tektronix 222 mini scope repair, looking for schematics

Dave Voorhis
 

On 1 Nov 2019, at 16:42, satbeginner <@satbeginner> wrote:

A question for other 222 owners: I am under the impression that Self Cal only works when in Storage Mode?
I’ve got a 222 and as far as I can tell, Self Cal works unconditionally. Just hit Aux Funct and Self Cal.

Re: Tektronix 222 mini scope repair, looking for schematics

satbeginner
 

Hi all,

a quick update, I cleaned the circuit board using alcohol, especially the area around the memory bus drivers and the memory chip, and behold: SUCCESS !!
I could not see any dirt or bad connections, but it appears there was something there.

A picture of this little beauty can be found here: https://groups.io/g/TekScopes/album?id=128546

A question for other 222 owners: I am under the impression that Self Cal only works when in Storage Mode?

Un saludo,

Leo

Re: Tektronix 222 mini scope repair, looking for schematics

satbeginner
 

Hello Håkan and others,

After our return to warm Spain I finally got to taking my 222 apart, and obviously I directly downloaded the schematics as provided by Håkan (Many, many thanks for the scan!).

My scope has the following going on:

Somebody already replaced the battery-pack using NiMh cells. (2x7 AA-cells, 7 pairs of two cells in parallel, connected in series)
It does turn on and it does show a sharp readout, but no trace(s)
Both button panels are responsive.
When I do the Align thing it does show a sharp matching set of rectangular figures using the entire screen, as shown in the manual.
When I perform a Self Cal on both Ch1 and Ch2 it nineteen out of twenty times comes with a Pass as result.

But...... during the Self Cal I only see the right half of the set of lines going up-and-down.
So, although the readout is using the entire screen, the traces (and only during Self Cal) use only the right half of the screen.

When I set the sensitivity on both channels to 5mV and touch the probe-tip I do see some (apparently un-triggered) noise on the right half of the screen.

My thinking so far:

The Analog part (attenuator etc) is OK; (because of Self Cal do Pass)
The Horizontal and Vertical Amps are OK; (because of readout and align pattern are OK)
The Z amplifier is OK; (because of the two assumptions above)

I am thinking of half the storage memory being dead, or not clocked properly?
- Assuming the Self Cal is reading the AD converter's data directly into the CPU, so the storage/display memory is not used at that time?
- Assuming the Align thing is directly generated by the CPU, so the storage/display memory is not used?

Any thoughts or suggestions?
Anybody already repaired one of these little beauties?

To be continued, un saludo,

Leo

Re: Tek 453A-1

Tom Gardner
 

On 01/11/19 12:05, Dale H. Cook wrote:
On 11/1/2019 6:52 AM, quadzillatech wrote:

well looks like ive wasted my time posting here so far !!
What are you in such a hurry for? I am sure that many who sub this reflector do not check it frequently. I hadn't checked it since your first post largely because, during most of that time, I was asleep.


On 10/31/2019 8:41 PM, quadzillatech wrote:

ive checked all the electrolytics for high esr,they all test good,
Did you do all of the power supply checks for the power supply adjustment? Which precision meter are you using for checking the low voltages? Which meter are you using for checking the HV test point? Do you have experience in troubleshooting and repairing instrumentation?

Do you have a second, working 'scope? The old adage is that you need a 'scope to fix a 'scope.
There is an "m3vuv" who is rebuilding a broken 30kV probe for use with a
Fluke 85 (and maybe an Avo 8),  choosing the resistors empirically.

https://www.eevblog.com/forum/projects/hv-probe/msg2761308/#msg2761308
Don't bother to read it all!

Re: Tek 453A-1

Dale H. Cook
 

On 11/1/2019 6:52 AM, quadzillatech wrote:

well looks like ive wasted my time posting here so far !!
What are you in such a hurry for? I am sure that many who sub this reflector do not check it frequently. I hadn't checked it since your first post largely because, during most of that time, I was asleep.


On 10/31/2019 8:41 PM, quadzillatech wrote:

ive checked all the electrolytics for high esr,they all test good,
Did you do all of the power supply checks for the power supply adjustment? Which precision meter are you using for checking the low voltages? Which meter are you using for checking the HV test point? Do you have experience in troubleshooting and repairing instrumentation?

Do you have a second, working 'scope? The old adage is that you need a 'scope to fix a 'scope.
--
Dale H. Cook, GR/HP/Tek Collector, Roanoke/Lynchburg, VA
https://plymouthcolony.net/starcity/radios/

Re: Tek 453A-1

Glenn Little
 

Be patient!! it has only been 10 hours since you asked for help.

Glenn

On 11/1/2019 6:52 AM, quadzillatech@... wrote:
well looks like ive wasted my time posting here so far !!


--
-----------------------------------------------------------------------
Glenn Little ARRL Technical Specialist QCWA LM 28417
Amateur Callsign: WB4UIV wb4uiv@... AMSAT LM 2178
QTH: Goose Creek, SC USA (EM92xx) USSVI LM NRA LM SBE ARRL TAPR
"It is not the class of license that the Amateur holds but the class
of the Amateur that holds the license"

Re: Tek 453A-1

quadzillatech@...
 

well looks like ive wasted my time posting here so far !!

Re: Free 535 with scope cart and extra plugins (Pittsburg)

Harvey White
 

anything at Sphere.

I live in Florida.

Harvey

On 10/31/2019 5:28 PM, Les WB6ORZ wrote:
   The Law of Letdown: The free great item will always be pickup in excess of a 4-day drive. Each way.    (((73)))    Les WB60RZ    Menlo Park, CA
-------- Original message --------From: Mlynch001 <@mlynch001> Date: 10/31/19 1:26 PM (GMT-08:00) To: TekScopes@groups.io Subject: Re: [TekScopes] Free 535 with scope cart and extra plugins (Pittsburg) That would be an excellent find for someone.  I don't do too much with the 5 series, but that price would be hard to resist.  If I was close, I would be sorely tempted, however, I'm not driving 1900 miles to get it.-- Michael LynchDardanelle, AR

Re: Free 535 with scope cart and extra plugins (Pittsburg)

Les WB6ORZ <wb6orz@...>
 

The Law of Letdown: The free great item will always be pickup in excess of a 4-day drive. Each way.    (((73)))    Les WB60RZ    Menlo Park, CA

-------- Original message --------From: Mlynch001 <@mlynch001> Date: 10/31/19 1:26 PM (GMT-08:00) To: TekScopes@groups.io Subject: Re: [TekScopes] Free 535 with scope cart and extra plugins (Pittsburg) That would be an excellent find for someone.  I don't do too much with the 5 series, but that price would be hard to resist.  If I was close, I would be sorely tempted, however, I'm not driving 1900 miles to get it.-- Michael LynchDardanelle, AR

Tek 453A-1

quadzillatech@...
 

Hi all,ive the above scope,i brought it as faulty with no trace,after some poking around i found a couple of transistors dead on the z axis board along with a few resistors out of spec due to age,i now have a trace but cant adjust the high voltage to - 1950v,the most i get is -1093,the hv adjustment pot R900 makes no difference to the voltage whatsoever ive renewed the door knob on the eht comp but no change,the cal is all to pot due to the low hv,any ideas where to look and what to check?,ive checked all the electrolytics for high esr,they all test good,cheers m3vuv 73.