Date   

Re: Double messages

Roy Morgan
 

Jim,

I have no idea, but if the list owner has not replied to you, I suggest an email direct to him: (See links below)

Group Owner: TekScopes+owner@groups.io <mailto:TekScopes+owner@groups.io>
Roy Morgan
k1lky68@... <mailto:k1lky68@...>



On Jul 6, 2018, at 6:01 PM, Jim Ford <james.ford@... <mailto:james.ford@...>> wrote:

To whom it may concern, now that I can post to TekScopes, I get double copies of every message. Very annoying! How do I get it to stop?
Thanks!
Jim


Sent from my Verizon, Samsung Galaxy smartphone


Re: OT: Scopes and other electronics on "The Outer Limits"

Roy Morgan
 

I used the Tek 545 scope at Teradyne in the mid 1970’s. The final systems test area was an open lab with overhead fluorescent lighting that made it hard to see the trace on the scope. If we did not have the standard Tek cylindrical aluminum CRT light shield, we’d fashion a substitute from a file folder or similar piece of cardboard.

I suspect the white cowling on the scope in the movie was a “homemade” attempt to shield the CRT from the room lights.


Roy Morgan
k1lky68@... <mailto:k1lky68@...>

On Tue, 10 Jul 2018 19:17:46 -0400, you wrote:

I've been watching some episodes of the outstanding US science-fiction TV
series "The Outer Limits", which aired from 1963-1965 (two seasons)….
One episode showed, in the background, a cart-mounted scope which had the
general form and panel layout of a Tek 500 series, but with a sort of white
cowling around the top and sides of the front panel.


Re: S- series sampling head connectors

cmjones01
 

Thanks to all for the responses. I'm glad to hear it's 0.156". I've got lots of those connectors from playing with vintage arcade game PCBs which use them all over the place. As I understand it, the SMB connector is just for the trigger pickoff, isn't it? I'm not planning to use that (Real Samplers don't need trigger pickoff :-)

Chris


Homemade tunnel diodes

 

Sam Zeloof made some negative resistance tunnel diodes. I wonder if his
approach could ever be refined to where we can make our own sampler diodes.
See below for curve tracer plots.

https://twitter.com/szeloof/status/1006586519732224000


Re: S- series sampling head connectors

 

Yes that coax connector is an SMB. The pitch on the connectors is .156" (matching socket in 7S11 or 7S12 was Viking 000-201-2901)

Dave

-----Original Message-----
From: TekScopes@groups.io [mailto:TekScopes@groups.io] On Behalf Of cmjones01
Sent: 13 July 2018 22:17
To: TekScopes@groups.io
Subject: [TekScopes] S- series sampling head connectors

Does anyone know the pitch of the edge connector on the back of S-series sampling heads, like the S-1 and S-2? I've just ordered a couple of cheap ones to play with and would like to make a custom cable for them. I can't tell from the photos whether the connector is 0.1", 0.15" or 0.156" pitch. I'm hoping it's the latter because I've got lots of those.

There's a coax connector by the side which looks kind of like an SMB - is it?

Thank you
Chris


Re: Low cost Scope-Mobile alternatives?

Bill Higdon
 

Al,
Where do you live? I have a Tek Scope cart I need to rehome, in the Pacific North Wet
Bill Higdon (willard561 at aol.c0m)


Re: S- series sampling head connectors

Harvey White
 

On Fri, 13 Jul 2018 14:17:02 -0700, you wrote:

Does anyone know the pitch of the edge connector on the back of S-series sampling heads, like the S-1 and S-2? I've just ordered a couple of cheap ones to play with and would like to make a custom cable for them. I can't tell from the photos whether the connector is 0.1", 0.15" or 0.156" pitch. I'm hoping it's the latter because I've got lots of those.
Go for 0.156. At that time, 0.1 or .156 would have been the only
ones. My digital calipers say 0.156.

Harvey





There's a coax connector by the side which looks kind of like an SMB - is it?

Thank you
Chris



Re: OT (but maybe useful info) Recall on Harbor Freight automotive fuses

Harvey White
 

On Fri, 13 Jul 2018 09:24:41 -0700, you wrote:

One of my cheapo HF miter saws crapped out recently, apparently from the main switch burning up. I went to their support website to see if I could find a new switch versus replacing the whole thing, and stumbled upon this unrelated recall notice:

https://images.harborfreight.com/hftweb/recalls/fuse_sets.pdf

I bought a couple of these sets years ago, and don't recall if or where I may have used some of these fuses, and am a bit worried. Thought I'd mention it here in case anyone has done the same.
OK, the automotive fuses are rated at 32 volts maximum (typical) and
are NOT made for interrupting 120 or 240 volts.



It turned out that they didn't have the switches anymore, and it's a good thing. I ended up just getting a fresh saw on sale and with my 20% off coupon, and later found that the motor in the old saw had burned out, which is what caused the switch to burn up. If I had found a new switch, it would have been a waste. No regrets though, since I got a lot of use out of the old beast over several years, and worked it very hard lots of times.
I have an HF wet/dry grinder (the one with the vertical mount slow
wheel that is suspended within a tank of water). The switch failed.

It is rather nice for grinding off the little tabs left over from a
popular PC board house, the water keeps the fiberglass dust from
getting out into the shop.

Harvey



Ed



Re: S- series sampling head connectors

Pete Lancashire
 

Yes they did 3 ft and 6ft. Plus for the s3000 family they made them in
lengths required to get from the 568 to the test drawer.

On Fri, Jul 13, 2018, 2:57 PM Dave Daniel <kc0wjn@...> wrote:

I'm pretty sure that Tektronix also offered an extension cable that
consisted of a plug-in unit with a cable with a connector at the end
that plugged into any of the sampling heads.

I could that that, but my extension module is somewhere in a box either
in my house on on a truck headed my way.

DaveD


On 7/13/2018 5:52 PM, Pete Lancashire wrote:
If you run out of S1s I will soon have about 20 dead S1 & S2s as part of
my
s3110 restoration project.

I forget the picture of the connector but it is a standard Edge connector
the only thing Tek did was to use a hire gold thickness than a normal
connector. There is nothing special about the interconnect the cable tech
made was custom because it was cheap for them to do it but the only thing
custom is the embedded coax. I'm sure it's just a piece of rg174
woodwork.

On Fri, Jul 13, 2018, 2:17 PM cmjones01 <chris@...> wrote:

Does anyone know the pitch of the edge connector on the back of S-series
sampling heads, like the S-1 and S-2? I've just ordered a couple of
cheap
ones to play with and would like to make a custom cable for them. I
can't
tell from the photos whether the connector is 0.1", 0.15" or 0.156"
pitch.
I'm hoping it's the latter because I've got lots of those.

There's a coax connector by the side which looks kind of like an SMB -
is
it?

Thank you
Chris








Re: S- series sampling head connectors

Dave Daniel
 

I'm pretty sure that Tektronix also offered an extension cable that consisted of a plug-in unit with a cable with a connector at the end that plugged into any of the sampling heads.

I could that that, but my extension module is somewhere in a box either in my house on on a truck headed my way.

DaveD

On 7/13/2018 5:52 PM, Pete Lancashire wrote:
If you run out of S1s I will soon have about 20 dead S1 & S2s as part of my
s3110 restoration project.

I forget the picture of the connector but it is a standard Edge connector
the only thing Tek did was to use a hire gold thickness than a normal
connector. There is nothing special about the interconnect the cable tech
made was custom because it was cheap for them to do it but the only thing
custom is the embedded coax. I'm sure it's just a piece of rg174 woodwork.

On Fri, Jul 13, 2018, 2:17 PM cmjones01 <chris@...> wrote:

Does anyone know the pitch of the edge connector on the back of S-series
sampling heads, like the S-1 and S-2? I've just ordered a couple of cheap
ones to play with and would like to make a custom cable for them. I can't
tell from the photos whether the connector is 0.1", 0.15" or 0.156" pitch.
I'm hoping it's the latter because I've got lots of those.

There's a coax connector by the side which looks kind of like an SMB - is
it?

Thank you
Chris




Re: S- series sampling head connectors

Pete Lancashire
 

If you run out of S1s I will soon have about 20 dead S1 & S2s as part of my
s3110 restoration project.

I forget the picture of the connector but it is a standard Edge connector
the only thing Tek did was to use a hire gold thickness than a normal
connector. There is nothing special about the interconnect the cable tech
made was custom because it was cheap for them to do it but the only thing
custom is the embedded coax. I'm sure it's just a piece of rg174 woodwork.

On Fri, Jul 13, 2018, 2:17 PM cmjones01 <chris@...> wrote:

Does anyone know the pitch of the edge connector on the back of S-series
sampling heads, like the S-1 and S-2? I've just ordered a couple of cheap
ones to play with and would like to make a custom cable for them. I can't
tell from the photos whether the connector is 0.1", 0.15" or 0.156" pitch.
I'm hoping it's the latter because I've got lots of those.

There's a coax connector by the side which looks kind of like an SMB - is
it?

Thank you
Chris




Re: Tek 465B blurred channel 1 trace

Timothy
 

I am posting an update as I am back on to trying to fix my 465B.
I thought a working scope would help me troubleshoot a intermittent problem but I ended up not needing one.

I changed out the smoothing caps and all my voltages are now within spec and ripple is hard to detect.

Since my problem was intermittent I may have let myself be lead down the wrong path, very embarrassing. I had no trace, I pulled the W4032 jumper (HV Mult GND) and my trace came back. This lead me to believe the HV multiplier was bad. I swapped it out and my trace came back. I turned off the scope because I forgot to put the cover back on the hv multiplier and needed to remove the vert preamp board to do so. Once I got it all back together I had no trace and no -8v. Every time I had measured previously I had -8v but I am worried I changed out the HV multiplier without needing to do so.

Moving forward and using isolation, I determined the vertical output board was the culprit. I couldn't find any bad components so I re-seated all the transistors and the CRT vertical deflection driver and Voila! I had my traces back and cleaner than ever. I still have a problem with distorted square waves but fuzziness is gone.

I need to test my old HV multiplier to see if it is good or bad. Maybe I just bumped something on the Vert Ouput board when I was removing the CRT. Or perhaps this was the problem all along.

I need to figure out why square waves are so bad on both channels. it looks like excessive ringing.


S- series sampling head connectors

cmjones01
 

Does anyone know the pitch of the edge connector on the back of S-series sampling heads, like the S-1 and S-2? I've just ordered a couple of cheap ones to play with and would like to make a custom cable for them. I can't tell from the photos whether the connector is 0.1", 0.15" or 0.156" pitch. I'm hoping it's the latter because I've got lots of those.

There's a coax connector by the side which looks kind of like an SMB - is it?

Thank you
Chris


Re: 2215 avoiding future CRT damage

 


Is there an index of titles?
Not in the microfiche that I'm aware of. If an instrument had a SUP, not the same a common mods,
it is included in the microfiche section concerning that specific instrument.

/Håkan


Re: 2465B Blue Screen Filter - 378-0270-00

Sergey Kubushyn
 

On Fri, 13 Jul 2018, k4ifg via Groups.Io wrote:

Here comes that infamous "Me too" moment :)

I would also purchase one if they are still available. ksi at koi8 dot net
for off-list contact.

Thanks in advance,
Sergey.

Victor Silva
I would be interested in obtaining three (3) of the blue screen filter if available.
Contact off group - k4ifg at yahoo
Thanks


---
******************************************************************
* KSI@home KOI8 Net < > The impossible we do immediately. *
* Las Vegas NV, USA < > Miracles require 24-hour notice. *
******************************************************************


575 trace issue resolved

John
 

Problem posted originally under #149304

What looked like dot-pattern on the horizontal trace(s), on closer inspection due to superimposed X-plate HF signal which gives velocity modulation of the spot.

This is a 234V model and we live in a relatively rural area with plenty of PV installations. Anyway, after much hunting around and decoupling of various supplies, it did turn out to be intereferance on the incoming mains. It is more-or-less cured by adding a 0.68uF class X capacitor across the primary of T702. Only when T701 is in the +/- straight-through position is the problem still visible, albeit diminished.
John


OT (but maybe useful info) Recall on Harbor Freight automotive fuses

Ed Breya
 

One of my cheapo HF miter saws crapped out recently, apparently from the main switch burning up. I went to their support website to see if I could find a new switch versus replacing the whole thing, and stumbled upon this unrelated recall notice:

https://images.harborfreight.com/hftweb/recalls/fuse_sets.pdf

I bought a couple of these sets years ago, and don't recall if or where I may have used some of these fuses, and am a bit worried. Thought I'd mention it here in case anyone has done the same.

It turned out that they didn't have the switches anymore, and it's a good thing. I ended up just getting a fresh saw on sale and with my 20% off coupon, and later found that the motor in the old saw had burned out, which is what caused the switch to burn up. If I had found a new switch, it would have been a waste. No regrets though, since I got a lot of use out of the old beast over several years, and worked it very hard lots of times.

Ed


Re: 2465B Blue Screen Filter - 378-0270-00

Richard
 

Victor Silva
I would be interested in obtaining three (3) of the blue screen filter if available.
Contact off group - k4ifg at yahoo
Thanks


Re: 2215 avoiding future CRT damage

Brian Cockburn
 

Håkan,

I'm not looking for anything specific, just looking to have them more publicly available, findable (Google / Bing), and searchable. My preferred route would either be to archive some sort of machine readable copies at http://w140.com/tekwiki/ or, as some documents already are, linked through to your website.

Is there an index of titles?

Regards, Brian.


Re: Pass the word - vintagTEK instrument loans for students

Craig Sawyers <c.sawyers@...>
 

I just received this from Dave Brown at the vintageTEK Museum:
Today the vintageTEK museum announced the official launch of their instrument library. This is an
opportunity for students, age 10 and older, to check out instruments on loan for their personal
projects and education.
That sounds like an excellent initiative. Particularly the 465, 475 and (gasp) 485 - a very capable
scope, which I would like to have in my Tek stable myself. Let's hope it helps fire up young
enthusiasm for engineering, electronics and physics.

I started out with a monster boatanchor called a Hartley 13A (like this one
http://www.thevalvepage.com/testeq/hartley/13a/13a.htm ) , which were released onto the market in
the late 60's/ very early 70's as military surplus. Must have bought mine age about 14. And yes -
that was a formative purchase for sure. And was an upper body workout just to move it.

Craig