Date   
Re: Smallest Tek scope

David Holland
 

Missing the 211.... (single channel)

Little bits of mine here: (when the site is up.. :-} )

http://holland.homeip.us/testequipment/Tektronix/Tek_211_Portable_Scope



On Tue, Sep 5, 2017 at 8:05 PM, ovidiu.popa@... [TekScopes] <
TekScopes@...> wrote:

Yep, 212-214. BW is 500KHz-1MHz, though.


Just curious, anybody has one?








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Yahoo Groups Links



Re: Smallest Tek scope

Ovidiu Popa [Business]
 

Yep, 212-214. BW is 500KHz-1MHz, though.


Just curious, anybody has one?

Re: Smallest Tek scope

johncharlesgord
 

There were also the T201 and T202 LCD 'scopes marketed by Tektronix (but built by someone else). They were pretty dreadful.
--John Gord

---In TekScopes@..., <madyn@...> wrote :

On 05 Sep 2017 23:04:17 +0000, you wrote:

>I vaguely remember from the late 70's and '80s journals (Electronic Design?) an ad with a Tektronix scope that would fit on my palm. Something like a 1.5" CRT, 5MHz bandwidth (again if memory serves). It was advertised as a field scope, having battery supply.
>
>
> I am unable to find any trace of this scope model on the Internet. It is also not on the Tek scope museum. Am I dreaming, or my memory plays tricks?
>

212 to about 225 or so, those are the only ones that I know of.
Bandwidth of 1 Mhz to 10 Mhz, analog, storage, digital as required.
Battery supply. It had integral probes that are frequently removed.

Closest that I know of.

Harvey

>
>
>
>

Re: Smallest Tek scope

Harvey White
 

On 05 Sep 2017 23:04:17 +0000, you wrote:

I vaguely remember from the late 70's and '80s journals (Electronic Design?) an ad with a Tektronix scope that would fit on my palm. Something like a 1.5" CRT, 5MHz bandwidth (again if memory serves). It was advertised as a field scope, having battery supply.


I am unable to find any trace of this scope model on the Internet. It is also not on the Tek scope museum. Am I dreaming, or my memory plays tricks?
212 to about 225 or so, those are the only ones that I know of.
Bandwidth of 1 Mhz to 10 Mhz, analog, storage, digital as required.
Battery supply. It had integral probes that are frequently removed.

Closest that I know of.

Harvey




Smallest Tek scope

Ovidiu Popa [Business]
 

I vaguely remember from the late 70's and '80s journals (Electronic Design?) an ad with a Tektronix scope that would fit on my palm. Something like a 1.5" CRT, 5MHz bandwidth (again if memory serves). It was advertised as a field scope, having battery supply.


I am unable to find any trace of this scope model on the Internet. It is also not on the Tek scope museum. Am I dreaming, or my memory plays tricks?

Re: Restoring a type 547 and 422 scopes (also my introduction to the group=

The Guy
 

Hi Kevin,

The problem is that resistor R671 gets super hot (around 250F).

After relay K601 kicks in the resistor still gives out those 100vdc, it seems that it should stop working after warm up (?)

I can hear the relay kick in after 30 seconds or so. No red filament in tube relay k600 whatsoever... Just an electric flash when relay k601 kicks in.

Thank you

On 05-09-2017, at 7:18 p.m., "'Kevin Wood' mailinglists@... [TekScopes]" <TekScopes@...> wrote:

Do you have a problem with it?

You should hear it pull in after about 30 seconds of operation, the
filament in K600 should extinguish and from that point all the DC rails
should be present at their test points.

If the above happens, I'd say you have nothing to worry about.

Kevin

damn.... that k601 relay seems quite complicated! How do i fix it? ...or
even check it?





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Posted by: nicolas.sog@...
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Yahoo Groups Links



[Non-text portions of this message have been removed]

Re: Restoring a type 547 and 422 scopes (also my introduction to the group=

Chuck Harris
 

K601, not K600. He has a problem with K601 not turning
on the plugin's 100V regulated filament power, but rather
continuing to use the warm-up power from a series resistor.

-Chuck Harris

'Kevin Wood' mailinglists@... [TekScopes] wrote:

Do you have a problem with it?

You should hear it pull in after about 30 seconds of operation, the
filament in K600 should extinguish and from that point all the DC rails
should be present at their test points.

If the above happens, I'd say you have nothing to worry about.

Kevin

damn.... that k601 relay seems quite complicated! How do i fix it? ...or
even check it?





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Posted by: nicolas.sog@...
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Yahoo Groups Links





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Posted by: "Kevin Wood" <mailinglists@...>
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Yahoo Groups Links



Re: Restoring a type 547 and 422 scopes (also my introduction to the group=

Kevin Wood G7BCS
 

Do you have a problem with it?

You should hear it pull in after about 30 seconds of operation, the
filament in K600 should extinguish and from that point all the DC rails
should be present at their test points.

If the above happens, I'd say you have nothing to worry about.

Kevin

damn.... that k601 relay seems quite complicated! How do i fix it? ...or
even check it?





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Posted by: nicolas.sog@...
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Yahoo Groups Links


Re: Nagging question about the Alligator Clip Boots on Tek Ground leads

Converter
 

It seems that these you like the clothespins I saw in the Pomona 6551 probe. But I never attached too much importance to this, because for serious measurements these too long ground wire I never use.
http://s001.radikal.ru/i193/1709/b8/f46046d2fb73.jpg http://s001.radikal.ru/i193/1709/b8/f46046d2fb73.jpg
http://s019.radikal.ru/i616/1709/62/a85576c99d47.jpg http://s019.radikal.ru/i616/1709/62/a85576c99d47.jpg

---In TekScopes@..., <stefan_trethan@...> wrote :

You can make online polls you know, even on yahoo I think. ;-)

As for alligator clips, the classic style typically found on scope
ground leads totally sucks, Mueller or otherwise.
I throw all of them out and use MultiContact clips with separate
molded plastic parts instead of this nasty rubber or PVC boot that is
often gone hard or ripped and doesn't allow the clip to either open or
close properly depending on which way it is put on. The jaws never
close good enough so you can grab fine wires, and don't open enough so
you could grab large stuff securely.
No, for me it is straight to the garbage bin with that and put on some
decent clips that are not missing the last 100 years in technological
development.

Multi contact clips (center):
<http://media.rs-online.com/t_large/R8251206-01.jpg http://media.rs-online.com/t_large/R8251206-01.jpg>

Hirschmann micro kleps for the small stuff:
<https://www.electronic-shop.lu/cache/catalog/product/9/7/img_640_480_watermark_973972100.jpg https://www.electronic-shop.lu/cache/catalog/product/9/7/img_640_480_watermark_973972100.jpg>

Sorry about the rant, I understand there will be people disagreeing
with me, but it always bugs me to find these crappy clips on anything.
The US makes a lot of fine gear, but in my mind in the area of test
leads and clips and the like it is firmly stuck in the 1950s.

By the way you can see the "right" way to put on the Müller boots on
their website.

ST


On Tue, Sep 5, 2017 at 2:07 AM, 'Dennis Tillman' dennis@... mailto:dennis@...
[TekScopes] <TekScopes@... mailto:TekScopes@...> wrote:
> I use a lot of alligator clips in my career. Mueller makes the nicest ones
> in my opinion. There is nothing wrong with the clips that Tek uses,
>
> But Tek seems to put the insulating boots on backward for the ground clip
> made for their probes from the 1960s to the late 1980s.
>
> After the 1980s they switched to a different shaped boot for some probes
> that can only go on one way.
>
> Presumably a company that makes clips (like Mueller) would be the reference
> when it came to which way they should go on.
>
>
>
> Rather than take up TekScopes bandwidth with replies that either agree that
> they are on the correct way or they are on in reverse.
>
>
>
> I would ask that you send your comment to me in the subject of an email.
>
> Please indicate if you think Tek is correct by putting the phrase TEK IS
> CORRECT in the subject of the email
>
> If you think they are on backward put the phrase TEK IS BACKWARD in the
> subject of the email.
>
>
>
> I'll tally the results and report back as soon I think I have heard from
> everybody who has an opinion about this.
>
>
>
> Send your email to dennis@... mailto:dennis@... <mailto:dennis@... mailto:dennis@...> with
> TEK IS CORRECT or TEK IS BACKWARD in the subject
>
>
>
> Dennis Tillman W7PF
>
>
>
>
>
>
>
> ------------------------------------
> Posted by: "Dennis Tillman" <dennis@... mailto:dennis@...>
> ------------------------------------
>
>
> ------------------------------------
>
> Yahoo Groups Links
>
>
>

Re: Wanted Tektronix 519 Scope

widgethunter
 

what if I had one in norcal?
what do you want this for?

-----Original Message-----
From: altairjump@... [TekScopes] <TekScopes@...>
To: TekScopes <TekScopes@...>
Sent: Fri, Sep 1, 2017 8:04 pm
Subject: [TekScopes] Wanted Tektronix 519 Scope






Hello,
I'm looking for a Tektronix 519 scope. Does not have to be functional.

Thanks



[Non-text portions of this message have been removed]









[Non-text portions of this message have been removed]

Re: Restoring a type 547 and 422 scopes (also my introduction to the group=

The Guy
 

damn.... that k601 relay seems quite complicated! How do i fix it? ...or even check it?

Re: New Member with TEK475 PS problems

Jonathan Boette
 

Chuck and Reed:

TNX for the very helpful information.

Trouble shooting has been suspended during the nice wx we have been having
up here in VT.
I have order 10 pcs KEMET 10uf 35V tantalums. Trouble shooting will resume
when the caps arrive.

TNX for the info and ain't the internet wonderful?

... jonathan

Re: 465M Power Supply Problems

n4buq
 

The schematic shows 1.8 mH and the part number referenced is 70F183AI which, according to what I'm finding, is a 1.8 mH choke.

The part that came out had brown, gray, and orange dots which agrees with the 183 in the part number and I assume means 1.8 x 10^-3 H.

I finally found an exact replacement for $8.70 shipped so not too terribly bad if I can't find it cheaper.

Thanks,
Barry - N4BUQ

----- Original Message -----
From: "David @DWH [TekScopes]" <TekScopes@...>
To: TekScopes@...
Sent: Monday, September 4, 2017 11:32:38 PM
Subject: Re: [TekScopes] 465M Power Supply Problems

The inductance value is not critical however double check the value.
My 455 schematic shows 1.8uH and the parts list says 1.8mH. Which is
it? The fine wire indicates 1.8mH.

Assuming it is 1.8mH, the LC resonate frequency comes out as 2.7 kHz
so I do not see any reason using 1.5mH, 1.8mH, 2.2mH, or 3.3mH will
not work just as well.

On Mon, 4 Sep 2017 19:23:44 -0400 (EDT), you wrote:

I worked on this for about another hour - picking and pulling at the turns;
however, I was not able to get a successful strand of any substantial
length from the windings. I don't know the exact wire gauge, but the
varnished wire measures very close to 0.003" (probably 40 gauge) so it's
about like working with human hair. I finally called quits.

While I can get the same 1.8 mH choke, I can get a 1.5 mH or a 3.3 mH choke
from the same series much more inexpensively. Would it be a necessarily
poor choice to go with one of those and, if not, which one would be the
better choice (or does it really matter that much)?

Thanks,
Barry - N4BUQ

Re: Scopes for sale

Harvey White
 

On Tue, 05 Sep 2017 14:26:20 +1000, you wrote:

OK - I have just invested in a TDS 620A (amazing device) which makes the
following stuff redundant. (for low frequency - I have my trusty D13)

Tek 935 (35 MHz "portable" - and the spare parts to fix the UHV
section (all manuals)
A 2235 which needs a power supply repair (all manuals)
plus a really nice 100 MHz CRT and power supply ex OX8620 digital
analog scope Metrix (manual incl)

You might consider keeping the 2235 and repairing the power supply.
There are times when you need a more portable scope, or a second one
(for instance, fixing the TDS 620A, which can happen).

The D13 may not be up to the bandwidth requirements.

Harvey



Plus a collection of oldies

ML VHF FM signal Generator (+ manual) TF 2011
Telonics Sweep Generator 2003 (may have more info on that).
Avantek CR 4000 spectrum analyser (0-400 MHz) - (a wire has broken off a
switch) - (full manual).

All for free - you pay the shipping.




Re: 2235 horizontal sweep ripples wrong direction

Siggi
 

On Mon, Sep 4, 2017 at 20:40 izm9515@... [TekScopes] <
TekScopes@...> wrote:



Unfortunately my mom made me put the cabinet back on after 1 look at the
7kV warning on the CRT neck. The issue is minor, So I will wait another 3
years. See yall then!
Hey Ilan,

That's too bad, though your mom may well be right. You may still want to
get and study the service manual, as if you're of the bent, you're sure to
learn a lot from it. You may also want to read this doc: <
http://www.sphere.bc.ca/test/tek-parts/troubleshooting-scopes.pdf> and do
your own diagnosis on your ailing scope.

Keep your lasers handy!

Siggi

Re: Scopes for sale

Peter Crary
 

Hello Hugh,
I would be interested in the Avantek CR4000 if it is still available. Please let me know what it would cost to ship to 06365.
Thanks,
Peter

On Sep 5, 2017, at 12:26 AM, hugh @Hugh [TekScopes] <TekScopes@...> wrote:

OK - I have just invested in a TDS 620A (amazing device) which makes the
following stuff redundant. (for low frequency - I have my trusty D13)

Tek 935 (35 MHz "portable" - and the spare parts to fix the UHV
section (all manuals)
A 2235 which needs a power supply repair (all manuals)
plus a really nice 100 MHz CRT and power supply ex OX8620 digital
analog scope Metrix (manual incl)

Plus a collection of oldies

ML VHF FM signal Generator (+ manual) TF 2011
Telonics Sweep Generator 2003 (may have more info on that).
Avantek CR 4000 spectrum analyser (0-400 MHz) - (a wire has broken off a
switch) - (full manual).

All for free - you pay the shipping.


[Non-text portions of this message have been removed]

Re: Nagging question about the Alligator Clip Boots on Tek Ground leads

stefan_trethan
 

You can make online polls you know, even on yahoo I think. ;-)

As for alligator clips, the classic style typically found on scope
ground leads totally sucks, Mueller or otherwise.
I throw all of them out and use MultiContact clips with separate
molded plastic parts instead of this nasty rubber or PVC boot that is
often gone hard or ripped and doesn't allow the clip to either open or
close properly depending on which way it is put on. The jaws never
close good enough so you can grab fine wires, and don't open enough so
you could grab large stuff securely.
No, for me it is straight to the garbage bin with that and put on some
decent clips that are not missing the last 100 years in technological
development.

Multi contact clips (center):
<http://media.rs-online.com/t_large/R8251206-01.jpg>

Hirschmann micro kleps for the small stuff:
<https://www.electronic-shop.lu/cache/catalog/product/9/7/img_640_480_watermark_973972100.jpg>

Sorry about the rant, I understand there will be people disagreeing
with me, but it always bugs me to find these crappy clips on anything.
The US makes a lot of fine gear, but in my mind in the area of test
leads and clips and the like it is firmly stuck in the 1950s.

By the way you can see the "right" way to put on the Müller boots on
their website.

ST


On Tue, Sep 5, 2017 at 2:07 AM, 'Dennis Tillman' @Dennis_Tillman_W7PF
[TekScopes] <TekScopes@...> wrote:
I use a lot of alligator clips in my career. Mueller makes the nicest ones
in my opinion. There is nothing wrong with the clips that Tek uses,

But Tek seems to put the insulating boots on backward for the ground clip
made for their probes from the 1960s to the late 1980s.

After the 1980s they switched to a different shaped boot for some probes
that can only go on one way.

Presumably a company that makes clips (like Mueller) would be the reference
when it came to which way they should go on.



Rather than take up TekScopes bandwidth with replies that either agree that
they are on the correct way or they are on in reverse.



I would ask that you send your comment to me in the subject of an email.

Please indicate if you think Tek is correct by putting the phrase TEK IS
CORRECT in the subject of the email

If you think they are on backward put the phrase TEK IS BACKWARD in the
subject of the email.



I'll tally the results and report back as soon I think I have heard from
everybody who has an opinion about this.



Send your email to @Dennis_Tillman_W7PF <mailto:@Dennis_Tillman_W7PF> with
TEK IS CORRECT or TEK IS BACKWARD in the subject



Dennis Tillman W7PF



[Non-text portions of this message have been removed]



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Posted by: "Dennis Tillman" <@Dennis_Tillman_W7PF>
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------------------------------------

Yahoo Groups Links


Re: 2235 horizontal sweep ripples wrong direction

 

I faced the same problem with my mom 64 years ago.  Fortunately for me, we had an uncle and a family friend who were electronics technicians.  She trusted them to mentor me as I learned the rules.  They taught me well enough that I was a TV repair technician by age 17.  My point is: Mom is right, but friends are always willing to help a precocious young man with a willing attitude.  

From: "izm9515@... [TekScopes]" <TekScopes@...>
To: TekScopes@...
Sent: Monday, September 4, 2017 7:40 PM
Subject: [TekScopes] Re: 2235 horizontal sweep ripples wrong direction

  Unfortunately my mom made me put the cabinet back on after 1 look at the 7kV warning on the CRT neck. The issue is minor, So I will wait another 3 years. See yall then!

[Non-text portions of this message have been removed]

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[Non-text portions of this message have been removed]

Re: 465M Power Supply Problems

 

The inductance value is not critical however double check the value.
My 455 schematic shows 1.8uH and the parts list says 1.8mH. Which is
it? The fine wire indicates 1.8mH.

Assuming it is 1.8mH, the LC resonate frequency comes out as 2.7 kHz
so I do not see any reason using 1.5mH, 1.8mH, 2.2mH, or 3.3mH will
not work just as well.

On Mon, 4 Sep 2017 19:23:44 -0400 (EDT), you wrote:

I worked on this for about another hour - picking and pulling at the turns; however, I was not able to get a successful strand of any substantial length from the windings. I don't know the exact wire gauge, but the varnished wire measures very close to 0.003" (probably 40 gauge) so it's about like working with human hair. I finally called quits.

While I can get the same 1.8 mH choke, I can get a 1.5 mH or a 3.3 mH choke from the same series much more inexpensively. Would it be a necessarily poor choice to go with one of those and, if not, which one would be the better choice (or does it really matter that much)?

Thanks,
Barry - N4BUQ

Scopes for sale

battyhugh
 

OK - I have just invested in a TDS 620A (amazing device) which makes the following stuff redundant. (for low frequency - I have my trusty D13)

Tek 935 (35 MHz "portable" - and the spare parts to fix the UHV section (all manuals)
A 2235 which needs a power supply repair (all manuals)
plus a really nice 100 MHz CRT and power supply ex OX8620 digital analog scope Metrix (manual incl)

Plus a collection of oldies

ML VHF FM signal Generator (+ manual) TF 2011
Telonics Sweep Generator 2003 (may have more info on that).
Avantek CR 4000 spectrum analyser (0-400 MHz) - (a wire has broken off a switch) - (full manual).

All for free - you pay the shipping.