Date   

Re: Tektronix 453 Power Indicator Bulb needed

ROLYNN PRECHTL K7DFW
 

I am looking for one B1107, 'Power On' indicator bulb, for the Tektronix 453 that I am trying to fix. The Tek part number is 150-0045-00. Does anyone have one that they would like to sell me or can anybody suggest a place to buy a replacement? The bulb appears to be a custom built bulb and may be pure un-obtainium.


=====================================================================


Remove the bulb from the green lens assembly and look at the side of the bulb base.

The industry number or CM number is embossed in, or applied, to the metal base.

It is a common bulb.


Rolynn
Tek Bvtn and Sunset 1966-1971


Re: Up to date capacitor list for Tek 2465A and 2465B scopes (2018)

 

Menahem,
Any slight offense is in the past, lets go forward.  

My goal here is to "first do no harm" then to payback for the help I have received from others.  I don't usually speak up right away, instead giving time for more experienced scope technicians to lead the way.  But I am very experienced with a wide technical base.  Like you I repaired radios and TVs (in the 1960's for me) and was appalled at the corners some manufacturers took to save a few cents.  After graduation from college (1963), I worked for the old Bell Telephone Laboratory, then Collins Radio (both quality minded, high technology organizations).  During my career I worked on the Nike anti-missile system, the first GPS receivers, auto-pilots, cockpit flight instruments, and many other avionics products.  I sometimes consulted for Rockwell International on computer matters.  If you ever ride in a Boeing airplane your pilot uses instrument displays done by the organization I lead.  The Tektronix 24xx series of oscilloscope was everywhere during those working years.  Often even in the conference rooms.  At one time, as Director of Engineering for Air Transport, I authorized purchase of 75 of them in one year.  I tell this story to better introduce myself and to validate my statement that I, too, seek quality in our work.

I think your goals for a perfect (or near perfect) BOM are admirable and I encourage you to lead that effort.  I will contribute when able and when my contributions are helpful.  But perhaps we should consider that some users are unable to source all parts or from all vendors.  At one time, the list I posted included part numbers from Mouser as well as Digikey so they could be ordered form either.  But it was tedious to keep up, especially when some parts are not available from both vendors.  And my goals do not prevent part substitutions when the perfect part is difficult to source.

Finally, what capacitors do you advise to use on the 24x5B A5 board?  I am now repairing my second one and need to make choices for at least the electrolytics.  Both boards I have are missing pads from missing electrolyte leakage.  I clean the boards and replace the pads.  But if I replace the capacitors with electrolytic caps it is certain they will fail one day and it is certain they will further damage the board and my replacement pads are not as robust as the originals.  I see one seller of rebuilt A5 boards uses tantalum electrolytics.  But tantalums are notorious for failure unless significantly de-rated for voltage.  For now I have used electrolytics but have started a plan to change them out for tantalums, derated 2:1 or more.

On ‎Monday‎, ‎June‎ ‎18‎, ‎2018‎ ‎01‎:‎54‎:‎55‎ ‎AM‎ ‎CDT, M Yachad <@yachadm> wrote:

Hey Ron

Nice to get to know you! Thanks for telling us your story.
I understand your dilemma with your wife - we all empathize, even if we won't admit it as candidly as you did ;-)

I had no intention to deprecate, even if if it came across that way, and if I offended you, please accept my apology.

My purpose here is to build an iron-clad 2465 BoM, which will offer ALL users (experienced or not) an optimal long-lasting solution which will not require subsequent intervention under the cover again in our lifetimes.
In short, bringing together ALL our combined knowledge to provide an expert community solution.

I would not be writing all this, if it was not for all your help, because 9 years ago, when I started out on this journey and overhauled my own 2465B, I had no idea where to start, or which parts to select. All I knew was audio and linear PSU's. Only by asking these questions on this forum, was I able to get the info I needed, to do this once-only-required overhaul.

Today, SMPS overhaul (especially in TV's) is a substantial part of my workload, and I have built up my knowledge base substantially, regarding which component types are suited best in which areas of the circuit. I normally go through a few hundred capacitors every month, in these repairs.
So, I bring that acquired knowledge back to the forum, as a form of gratitude.

9 years later, the 2465B is still operating flawlessly, except for 2 problems (unrelated to the overhaul) - U700 failure, and a diode failure.
Solved quickly and painlessly, with the help of the generous people here.

I expect to pass all my lab equipment onto my middle son, aged 17, who is the only one of my 4 children who shows any serious interest in my work. With the maintenance I do on my equipment, I expect it to last 30 years for him as well.

Regarding suppliers, when approaching a project like this, I have learnt to not skimp, and if I have to source the optimal BoM from more than one supplier, then the small additional shipping cost (from the 2nd supplier) is peanuts, when figuring in the 20-30-year lifetime of a job done perfectly, not requiring any redo's in the future.

I use both Mouser and Digikey, but for the 2465 kits, Mouser offers me the parts I want, and also cheaper than Digikey by a few $ for this particular selection. So that extra $1 which you may pay Mouser for shipping, you'll probably save on individual parts costs.

Ancel,
I have used Nichicon PJ in the past as well - I have no aversion to them at all - and I normally use Nichicon PW (a tighter-tolerance brother of PJ) as my #1 choice.
That preference was based entirely on the datasheet specs, I did no comparison testing at all.

Menahem


Re: Help needed with no trace no beamfinder on 465 (not b)

 

Thanks Albert, you are of course right that I don't have a good grasp of even the basics. Your posts do help. But I've had enough of this project.

I didn't even want a 465- I wanted a 465B but haven't been able to find one locally and hesitate to buy one online. If anyone here on the forum can sell me a good working 465B within a few hours driving distance of Louisville KY then please PM me.

I will mention that a few years ago Albert, Raymond, David Hess, Ed B., Tom Miller, Hank, and a few others did help me fix the 465B I had at that time- it too was a long drawn out discussion, but ultimately together we got it working and I used it for a few years until I lost everything in my divorce...

Thanks for everyone’s help, this is really a friendly and fascinating group. At some point in the near future I will post for selling or parting out the 465 and the 464.

Keith Ostertag


Re: Self Governance of TekScopes.

stefan_trethan
 

No politics, no religion, no sports, simple as that. This has been the
golden rule for groups for a long time, because it works.

It doesn't matter how tempting it is to reply, how much a false
statement cries out for correction, I must not reply.
(And I intentionally write _I_ must not reply, because I am prone to
off topic posting myself.)

The sad truth is as much as we might agree on Tek scopes and technical
topics in general, you'd be surprised how much we disagree on those
three topics.
Best not to find out.

Forget all the other crap, forget off topic tangents or even the
personal attacks (which happen quite rarely here, thankfully).
That stuff just blows over by itself as people get bored or ashamed,
but the big three have the real potential to break a group.

The way I personally took Dennis's post was this: "Do not engage if
you see something very off topic, no matter how much you want to".
Admittedly this might be reading between the lines a bit, but if most
of us just stick to that simple rule everything else will sort itself
out.

I was quite pleased with myself that I managed to delete my response
to the Hiroshima post.

ST

On Mon, Jun 18, 2018 at 8:03 PM, Dennis Tillman W7PF
<@Dennis_Tillman_W7pF> wrote:
Hi Jeff,

Thanks for your reply. It points out the difficulty I had in composing my message. My intention was to enlist the help of the "TekScopes Elders" to keep the conversations relevant. I apologize if you felt I was grinding a line in concrete. That was not my intention at all and I hope nobody else took it that way.

The vast majority of off-topic posts (especially when the subject line specifically states it is off-topic) regarding test equipment, for example, or manufacturing methods in your case, are appropriate if the membership can be of help.

If you look at my posts you would find more than the usual number of off-topic posts because I have a huge respect for the depth and breadth of technical experience of our membership and I use them as a last resort when I can't find the answer on my own. When I remember to, I will also ask in my off-topic post, that they contact me off-line if they can help so I don't take up unnecessary TekScopes bandwidth.

I hope you can appreciate that as our membership grows it is inevitable that the variety of topics that come up will gradually make it more difficult for our members to find topic threads that are of specific interest to them. Improving the "signal to noise" ratio by keeping the focus on Tek products will enhance our reputation as a technical resource and make it easier for our members to filter out the topics that are of specific interest to them.

Dennis Tillman W7PF


Re: Self Governance of TekScopes.

EricJ
 

That nuke one was kind of my fault. Mea Culpa, and I understand completely. I might suggest also that if something does wander off topic that we reiterate that the subject line should be altered to make it less likely that someone will have to read through off-topic stuff when they are searching.
--Eric
Sent from my Samsung Galaxy S8.

-------- Original message --------From: Dennis Tillman W7PF <@Dennis_Tillman_W7pF> Date: 6/18/18 1:11 PM (GMT-06:00) To: TekScopes@groups.io Subject: Re: [TekScopes] Self Governance of TekScopes.
Hi John,
As I tried to make clear, the moderator, that's me, doesn't have the time to read every post even if I am responsible for keeping their content relevant.

I was asking for help of the "TekScopes Elders" who have been here for so long that they have an intrinsic ability to judge when something has drifted off topic and the skill to gently nudge it back to Tektronix.

Dennis Tillman W7PF

-----Original Message-----
From: TekScopes@groups.io [mailto:TekScopes@groups.io] On Behalf Of JJ
Sent: Monday, June 18, 2018 4:52 AM
To: TekScopes@groups.io
Subject: Re: [TekScopes] Self Governance of TekScopes.

I would think that it's the moderator's responsibility and no one else
(elders or otherwise) to filter the various threads. There are certain
topics that are completely off topic like politics and should be
cutoff.
But, there are others that are technical and very informative which are
gleaned from years of experience that allow us to pick up information
that is very helpful. I welcome those. So, you need to have a jeweler's
eye!

John Justin

On Mon, Jun 18, 2018 at 1:17 AM, Jeff Urban <@JURB> wrote:

Bit odd you bring this up now when I just got through posting in a
thread about 2 sided boards, and that went into some other things. My
experience, someone else about car radios using the same
manufacturing
methods and all, one with their own stereo unit the fixed by fixing a
2 sided board.

Now there's some thread drift forya, but it is still pertinent to the
subject. Of course WW2 is not. I have a group and I was thinking what
I would do. I would probably get in there and say "this one can
slide,
but anymore of this political shit and we are talking action, I do
not
want it here". And that it makes enemies easier than it makes
friends.

But now there is the Fluke 3300 thread. That is not a Tek scope. I
have no problem with it, I think maybe they could have been spurred
on
to my group but there are not enough members now to be sure to get
anything good back. If that is close enough to on topic fine. Good
that you don't want to stifle.

I think the thing here is that in moderating these, you can't just
grind a line into concrete. That's why we have human moderators. (and
judges and
whatever)

You could send some to my group, which I made specifically for other
test equipment. But I don't want anyone forced. I don't want to force
anyone to do anything. Not the WW2 thing though.

Put it this way, I may respond in threads that go political, but I
will never start one. I have more respect than that.





--
Dennis Tillman W7PF
TekScopes Moderator


Re: Self Governance of TekScopes.

 

Hi John,
As I tried to make clear, the moderator, that's me, doesn't have the time to read every post even if I am responsible for keeping their content relevant.

I was asking for help of the "TekScopes Elders" who have been here for so long that they have an intrinsic ability to judge when something has drifted off topic and the skill to gently nudge it back to Tektronix.

Dennis Tillman W7PF

-----Original Message-----
From: TekScopes@groups.io [mailto:TekScopes@groups.io] On Behalf Of JJ
Sent: Monday, June 18, 2018 4:52 AM
To: TekScopes@groups.io
Subject: Re: [TekScopes] Self Governance of TekScopes.

I would think that it's the moderator's responsibility and no one else
(elders or otherwise) to filter the various threads. There are certain
topics that are completely off topic like politics and should be
cutoff.
But, there are others that are technical and very informative which are
gleaned from years of experience that allow us to pick up information
that is very helpful. I welcome those. So, you need to have a jeweler's
eye!

John Justin

On Mon, Jun 18, 2018 at 1:17 AM, Jeff Urban <@JURB> wrote:

Bit odd you bring this up now when I just got through posting in a
thread about 2 sided boards, and that went into some other things. My
experience, someone else about car radios using the same
manufacturing
methods and all, one with their own stereo unit the fixed by fixing a
2 sided board.

Now there's some thread drift forya, but it is still pertinent to the
subject. Of course WW2 is not. I have a group and I was thinking what
I would do. I would probably get in there and say "this one can
slide,
but anymore of this political shit and we are talking action, I do
not
want it here". And that it makes enemies easier than it makes
friends.

But now there is the Fluke 3300 thread. That is not a Tek scope. I
have no problem with it, I think maybe they could have been spurred
on
to my group but there are not enough members now to be sure to get
anything good back. If that is close enough to on topic fine. Good
that you don't want to stifle.

I think the thing here is that in moderating these, you can't just
grind a line into concrete. That's why we have human moderators. (and
judges and
whatever)

You could send some to my group, which I made specifically for other
test equipment. But I don't want anyone forced. I don't want to force
anyone to do anything. Not the WW2 thing though.

Put it this way, I may respond in threads that go political, but I
will never start one. I have more respect than that.





--
Dennis Tillman W7PF
TekScopes Moderator


Re: Self Governance of TekScopes.

 

Hi Jeff,

Thanks for your reply. It points out the difficulty I had in composing my message. My intention was to enlist the help of the "TekScopes Elders" to keep the conversations relevant. I apologize if you felt I was grinding a line in concrete. That was not my intention at all and I hope nobody else took it that way.

The vast majority of off-topic posts (especially when the subject line specifically states it is off-topic) regarding test equipment, for example, or manufacturing methods in your case, are appropriate if the membership can be of help.

If you look at my posts you would find more than the usual number of off-topic posts because I have a huge respect for the depth and breadth of technical experience of our membership and I use them as a last resort when I can't find the answer on my own. When I remember to, I will also ask in my off-topic post, that they contact me off-line if they can help so I don't take up unnecessary TekScopes bandwidth.

I hope you can appreciate that as our membership grows it is inevitable that the variety of topics that come up will gradually make it more difficult for our members to find topic threads that are of specific interest to them. Improving the "signal to noise" ratio by keeping the focus on Tek products will enhance our reputation as a technical resource and make it easier for our members to filter out the topics that are of specific interest to them.

Dennis Tillman W7PF

-----Original Message-----
From: Jeff Urban, > Sent: Sunday, June 17, 2018 10:17 PM

Bit odd you bring this up now when I just got through posting in a
thread about 2 sided boards, and that went into some other things. My
experience, someone else about car radios using the same manufacturing
methods and all, one with their own stereo unit the fixed by fixing a 2
sided board.

Now there's some thread drift forya, but it is still pertinent to the
subject. Of course WW2 is not. I have a group and I was thinking what I
would do. I would probably get in there and say "this one can slide,
but anymore of this political shit and we are talking action, I do not
want it here". And that it makes enemies easier than it makes friends.

But now there is the Fluke 3300 thread. That is not a Tek scope. I
have no problem with it, I think maybe they could have been spurred on
to my group but there are not enough members now to be sure to get
anything good back. If that is close enough to on topic fine. Good that
you don't want to stifle.

I think the thing here is that in moderating these, you can't just
grind a line into concrete. That's why we have human moderators. (and
judges and whatever)

You could send some to my group, which I made specifically for other
test equipment. But I don't want anyone forced. I don't want to force
anyone to do anything. Not the WW2 thing though.

Put it this way, I may respond in threads that go political, but I will
never start one. I have more respect than that.
-----Original Message-----
From: TekScopes@groups.io [mailto:TekScopes@groups.io] On Behalf Of Dennis Tillman W7PF
Sent: Sunday, June 17, 2018 4:41 PM
To: TekScopes@groups.io
Subject: [TekScopes] Self Governance of TekScopes.

Members of Tekscopes,

The TekScopes Group Description on our home page says: "All about classic Tektronix test equipment, its use, repair, and collecting."

I hope everyone understands I do not have the time to read every post to TekScopes. So I am unaware of the majority of the content posted to TekScopes.

On occasion, the content strays beyond our Group Description. I have always been impressed that eventually someone will suggest that the conversation is not consistent with our group description. This is an important stabilizing force that keeps TekScopes relevant.

When this happens it would be a big help to me and the other members if one of our "TekScopes Elders" (you know who you are) intervenes as soon as they see this occur and suggests to the offending member that their current conversation is more appropriate elsewhere.

In the spirit of "See Something, Say Something", I would appreciate the TekScopes Elders making it their responsibly to gently guide any stray conversation back to Tektronix.

I hope it will only take one reminder from a TekScopes Elder to bring the stray conversation back to Tektronix. If that doesn't happen then please send me an email so I can intervene and stop it.

Thank you in advance,
Dennis Tillman W7PF

PS: I would greatly appreciate it if we could keep any follow-up comments to an absolute minimum so first take a look at these three categories to determine your next move:
1) If you understand what I am proposing and you are one of the TekScopes
Elders then there is no need to tell me. Please start now to "See Something, Say Something".
2) If you are someone who feels the need to say you approve of what I
proposed above please refrain from posting at all.
3) If you disagree with what I am proposing pleasing contact me directly
OFF LINE at @Dennis_Tillman_W7pF <mailto:@Dennis_Tillman_W7pF> and explain how I can do this better.




--
Dennis Tillman W7PF
TekScopes Moderator


Re: Up to date capacitor list for Tek 2465A and 2465B scopes (2018)

 

Jeff,
I think I remember a Jeff Davis who worked in General Aviation.  Is that you?  Its been a long time, my memory is good but not perfect.  There were several Rons here so I will give more information.  I am Ron Coffin, worked on the first working GPS receiver, lead the CAPS processor development, and was director of engineering for Air Transport.  I stayed here in Cedar Rapids.  My family is all here too (except one in Pennsylvania).  There were several other Rons in the company at the time so maybe you lucked out and knew a better one, lol.  We can share more if you are interested but probably by private email.  Lets spare the group from further details unless they ask.

On ‎Monday‎, ‎June‎ ‎18‎, ‎2018‎ ‎10‎:‎23‎:‎00‎ ‎AM‎ ‎CDT, Jeff Davis <n0dyjeff@...> wrote:

Hi Ron,


I wonder if we may know each other. I knew a Ron who would be about your age who ran an  engineering organization in Cedar Rapids. At the time, I was a brash young engineering group manager in a different organization who thought he knew it all. Life has a way of humbling one.


Now I live in Southern California and fix up Tak scopes for fun and occasionally resell them. Still working, but probably not too much longer.


Regards,

Jeff


You may address me as Ron, or Mac (for machineguy).  I usually use Mac on the net and Ron in the "real world".  >As a brief introduction, I am 78 years old, retired electronics engineer, now hobbyist, living in Iowa, USA.


Re: Tektronix 453 Power Indicator Bulb needed

Brendan
 

Sphere says they have 3 new in stock

T1 Based Lamp 150-0045-00 Incandescent Lamp T-1 miniature lamp with base. New in factory bags. 3 New $5.00

On Mon, Jun 18, 2018 at 09:31 am, Michael Gladu wrote:


I am looking for one B1107, 'Power On' indicator bulb, for the Tektronix 453
that I am trying to fix.
The Tek part number is 150-0045-00.
Does anyone have one that they would like to sell me or can anybody suggest a
place
to buy a replacement? The bulb appears to be a custom built bulb and may be
pure
un-obtainium. :(

Thanks.

73 de N1FBZ


Re: FS: Tektronix scopes on craigslist; North of Boston, MA

Phil Genera
 

I picked up a 7844 from this seller last week. He's a nice guy and clearing
out a scope rehab hobby, apparently.

--
Phil


On Fri, Jun 15, 2018 at 1:26 AM Craig Sawyers <c.sawyers@...>
wrote:

$100 for a 067-0587-02 calibration plug in is a steal.

Craig

-----Original Message-----
From: TekScopes@groups.io [mailto:TekScopes@groups.io] On Behalf Of
Shannon Hill
Sent: 14 June 2018 19:33
To: TekScopes@groups.io
Subject: [TekScopes] FS: Tektronix scopes on craigslist; North of
Boston, MA

Search for xyzzy in the listing body.
Thinning the herd, several working scopes for $100; along with some HP
and GenRad gear.






Problematic Tek 7A26 Vertical Amp

k6whp
 

I have a 7A26 vertical amp unit that is misbehaving. It is housed in a Tek 7704A. A borrowed (good) 7A26 operates correctly. The symptoms are as follows:

(1) The amplitude of a given signal does not remain constant when trace is scrolled from top to bottom on CRT.
(2) Both channels behave as described here.
(3) Occurs with low frequency traces (10 KHz) AND high frequency traces (10 MHz).
(4) A signal that shows 3 div is positioned with the upper peaks at the topmost graticule line.
(5) Its position is lowered using the POSITION pot to the next lowest graticule line and still shows 3 div.
(6) Its position is lowered using the POSITION pot to the next lowest graticule line it shows 2.6 div.
(7) Its position is lowered using the POSITION pot to the next lowest graticule line it shows 3 div.
(8) Its position is lowered using the POSITION pot to the next lowest graticule line it shows 3 div.
(9) Its position is lowered using the POSITION pot to the next lowest graticule line it shows 3 div.

The rapid motion sequence of the positioning is that the trace size diminishes in the upper portion (at approximately the second graticule line down) briefly and then regains its amplitude.

The pictures of this sequence can be seen at the following URL:

http://righthandofzod.blogspot.com/2018/06/problematic-tek-7a26.html

Any suggestions on where to begin searching for this problem are greatly appreciated.
--
William, k6whp
"A friend told me to cheer up, things could be worse.
So I cheered up and, sure enough, things got worse!"


Re: Up to date capacitor list for Tek 2465A and 2465B scopes (2018)

 

Hi Menahem:
I should place the illinois capacitor link for comparison to the Nichicon .

You'll see for the 50V, 2200uF cap I am using the KXM series (which I use mainly now) has much better ripple specs than Nichicon.
--------------------Capacitor size is 18mm x 35.5mm-----------------

illnois Capacitor: 3690 mA RMS ripple
http://www.farnell.com/datasheets/87169.pdf?_ga=2.251013574.1706536182.1529287061-97959724.1511408215

Nichicon PW: 3100 mA RMS ripple.
http://www.farnell.com/datasheets/1909381.pdf?_ga=2.151529593.1706536182.1529287061-97959724.1511408215


Re: using scope channel 1 and channel 2 invert and add functions vs floating DUT

nielsentelecom@sbcglobal.net
 

Thanks for the comment Steve ! I look forward to that document posting.


Good point on the common mode resolution limitation.

A question in regard to the CMRR, is the poor response a function of the scope speed and was it predictable? Would I be able to determine a max frequency just based on scope speed?

NielsenTelecom

On Thu, Jun 7, 2018 at 03:09 pm, ditter2 wrote:


Shortly before leaving Tektronix, I wrote a good app note on making floating
measurements, related to SMPS. That was 20 years ago, I don't think Tek still
has it on the web site. I will try to find the original file and post it. We
made several real measurements in the lab for research in the paper. Floating
instruments, isolators, and differential measurement techniques were compared.
Without rehashing the entire note, a summary is that for most applications,
differential measurements give the best results.
Subtracting channels is a differential mode of operating the scope. Compared
with a true differential amplifier or probe, channel A minus channel B has
much poorer CMRR at higher frequencies. The other major limitation is common
mode range. The common mode is the voltage you are floating on. IT is
limited to the full scale of the scope at the V/DIV setting you are using.
This is a real limitation in SMPS work when you need to measure small voltages
riding on top o flarge voltages. The common example in higher power inverters
is measuring the upper gate drive in a push-pull drive stage. The upper gate
only has a few volt (15 maximum) swing riding on a 350V swing. To keep the
common mode (350 V swing) within the common mode range, you need to set both
channels to 50 V/div. IT is difficult to see the gate drive with a 5 to 15 V
swing with the scope set to 50 V/div.

Steve


Re: using scope channel 1 and channel 2 invert and add functions vs floating DUT

nielsentelecom@sbcglobal.net
 

Thanks Dennis, I just downloaded it. I'll look at it.

Thanks for the comment.


Tektronix 453 Power Indicator Bulb needed

Michael Gladu <n1fbz@...>
 

I am looking for one B1107, 'Power On' indicator bulb, for the Tektronix 453 that I am trying to fix.
The Tek part number is 150-0045-00.
Does anyone have one that they would like to sell me or can anybody suggest a place
to buy a replacement? The bulb appears to be a custom built bulb and may be pure
un-obtainium. :(

Thanks.

73 de N1FBZ


Tek 49x -- Power Supply Replacement Capacitor List

 

Has someone compiled a list of the capacitors to replace in a Tek 49x series power supply? I seem to remember seeing such a parts list in the past, but do not readily see how to search the archives for the topic.

Bruce, KG6OJI


Re: 465 bad rise time

Brendan
 

Im using a 50ohm cable a 50ohm through termination and a pg506 fast rise pulse.

On Mon, Jun 18, 2018 at 08:31 am, HankC, Boston, WA1HOS wrote:


What is the source of the signal being displayed ?
What kind of probe is being used ?Is it compensated ??Is the probe ground lead
connected ?
Do yourself a favor & lose the probe.Connect to a decent signal source, via
coax, using a 50 ohm termination at the scope end.

HankC, Boston


Re: 465 bad rise time

 

What is the source of the signal being displayed ?
What kind of probe is being used ?Is it compensated ??Is the probe ground lead connected ?
Do yourself a favor & lose the probe.Connect to a decent signal source, via coax, using a 50 ohm termination at the scope end.

HankC, Boston


Re: Up to date capacitor list for Tek 2465A and 2465B scopes (2018)

Jeff Davis
 

Hi Ron,


I wonder if we may know each other. I knew a Ron who would be about your age who ran an engineering organization in Cedar Rapids. At the time, I was a brash young engineering group manager in a different organization who thought he knew it all. Life has a way of humbling one.


Now I live in Southern California and fix up Tak scopes for fun and occasionally resell them. Still working, but probably not too much longer.


Regards,

Jeff

You may address me as Ron, or Mac (for machineguy). I usually use Mac on the net and Ron in the "real world". >As a brief introduction, I am 78 years old, retired electronics engineer, now hobbyist, living in Iowa, USA.


Re: 465 bad rise time

Albert Otten
 

Sorry Raymond, again I missed you message of a few minutes ago!
BTW I sold my one and only 465 some time ago, so I can't help with doing measurements.
Albert