Date   

Re: TN500 Plugin 067-0699-99

Vince Vielhaber
 

While I'm thinking of it, Bob, can you take some pics of that for the
TekWiki?

Thanks!
Vince - K8ZW.

Hi Bob,
Vince is correct if what you have is a precision instrument or ...
you can find a set of kelvin clip leads for $10 to $20 on eBay from China
that will probably do just fine for a plugin that cost about the same as
the
Chinese Kelvin clip leads.

Dennis Tillman W7PF

-----Original Message-----
From: TekScopes@groups.io [mailto:TekScopes@groups.io] On Behalf Of Vince
Vielhaber
Sent: Thursday, September 05, 2019 5:04 PM

I don't know what connectors are on your plugin, but milliohm meters
typically take a 4 wire probe set. Two wires from each probe tip to
individual plugs to the meter. Often a piece of coax, like RG174 is used
for the two wires to each tip. You can either buy or make the probes, I
made a set for my Polar Toneohm and it works great. Or you can buy them
for
as much as a few hundred dollars - your choice!

Vince - K8ZW.

Does anyone have any information on a Tektronix TM500 plugin
067-0699-99?

It's a Milliohm-Voltmeter with a LCD front panel display.?? It has two
front panel Ohms connectors labeled Hi and Lo, a range switch (0.1, 1,
10, 100), Volts - Ohms switch, Volts jacks labeled Hi and Lo.?? It has
Tek serial number label.

A very cursory check on TekWiki didn't find anything. Unfortunately it
followed me home sans milliOhmeter probes.

Bob.


--
Dennis Tillman W7PF
TekScopes Moderator




Re: TN500 Plugin 067-0699-99

 

Hi Bob,
Vince is correct if what you have is a precision instrument or ...
you can find a set of kelvin clip leads for $10 to $20 on eBay from China
that will probably do just fine for a plugin that cost about the same as the
Chinese Kelvin clip leads.

Dennis Tillman W7PF

-----Original Message-----
From: TekScopes@groups.io [mailto:TekScopes@groups.io] On Behalf Of Vince
Vielhaber
Sent: Thursday, September 05, 2019 5:04 PM

I don't know what connectors are on your plugin, but milliohm meters
typically take a 4 wire probe set. Two wires from each probe tip to
individual plugs to the meter. Often a piece of coax, like RG174 is used
for the two wires to each tip. You can either buy or make the probes, I
made a set for my Polar Toneohm and it works great. Or you can buy them for
as much as a few hundred dollars - your choice!

Vince - K8ZW.

Does anyone have any information on a Tektronix TM500 plugin 067-0699-99?

It's a Milliohm-Voltmeter with a LCD front panel display.?? It has two
front panel Ohms connectors labeled Hi and Lo, a range switch (0.1, 1,
10, 100), Volts - Ohms switch, Volts jacks labeled Hi and Lo.?? It has
Tek serial number label.

A very cursory check on TekWiki didn't find anything. Unfortunately it
followed me home sans milliOhmeter probes.

Bob.


--
Dennis Tillman W7PF
TekScopes Moderator


Re: TN500 Plugin 067-0699-99

Vince Vielhaber
 

I don't know what connectors are on your plugin, but milliohm meters
typically take a 4 wire probe set. Two wires from each probe tip to
individual plugs to the meter. Often a piece of coax, like RG174 is used
for the two wires to each tip. You can either buy or make the probes, I
made a set for my Polar Toneohm and it works great. Or you can buy them
for as much as a few hundred dollars - your choice!

Vince - K8ZW.

Does anyone have any information on a Tektronix TM500 plugin 067-0699-99?

It's a Milliohm-Voltmeter with a LCD front panel display.?? It has two
front panel Ohms connectors labeled Hi and Lo, a range switch (0.1, 1,
10, 100), Volts - Ohms switch, Volts jacks labeled Hi and Lo.?? It has
Tek serial number label.

A very cursory check on TekWiki didn't find anything. Unfortunately it
followed me home sans milliOhmeter probes.

Bob.






SG-504 Head availability. OT sale item

 

Dear All:
In stock reminder for 2 new, upgraded & calibrated, SG504 Leveling
heads. SMA & BNC ready, complete with new LEMO cable & connector.…
https://www.ebay.com/itm/132801983494?

Details are available OFF this GROUP @ protofabtt@gmail.com
No replies here please!!

Ancel.


TN500 Plugin 067-0699-99

bobh@joba.com
 

Does anyone have any information on a Tektronix TM500 plugin 067-0699-99?

It's a Milliohm-Voltmeter with a LCD front panel display.?? It has two front panel Ohms connectors labeled Hi and Lo, a range switch (0.1, 1, 10, 100), Volts - Ohms switch, Volts jacks labeled Hi and Lo.?? It has Tek serial number label.

A very cursory check on TekWiki didn't find anything. Unfortunately it followed me home sans milliOhmeter probes.

Bob.


Re: Harmonica connectors repair

 

Hi Ignacio,
Can you give us typical Dupont part numbers for the connectors you are describing, or a Dupont web page for the product series.

I took a look at the cables I have and specifically the ones with blue connectors. There are two different color blue connectors. One is a powder blue (like a pastel blue) and the other is a normal blue color (not a navy blue which would be too dark). Since I seem to have several of each color blue Tek must have intentionally made two different color blue connectors.

None of the connectors I have (regardless of color) have ever broken that I can recall. The blue ones I have seem quite sturdy but it would still be good to know the Dupont information because I occasionally want to make my own extenders.

Dennis Tillman W7PF

-----Original Message-----
From: TekScopes@groups.io [mailto:TekScopes@groups.io] On Behalf Of EB4APL
Sent: Thursday, September 05, 2019 8:06 AM

Hi,
I have observed in my limited number of series 7000 scopes (only three) that the plastic contact holders of these harmonica connectors disintegrates easily when its color is blue. Maybe it is caused by a degradation of the plastic due to the blue pigment.

I found an easy and also dirty cheap replacement for these: I use Dupont .1" pitch connector housings. When I began my tests I supposed that I would need to use some glue for retaining the contacts, but it is not needed, the pins, which are mechanically different form the Dupont pins, are retained by the retention mechanism.

Maybe this is widely known, but I never had read anything about it.

Regards,
Ignacio EB4APL



--
Dennis Tillman W7PF
TekScopes Moderator


Re: TDS540B Power On Self Test Pass, but changing results from SPC

RochMesa@...
 

Hi...did a re-cap on an old TDS-520A that I recently acquired. Everything worked after my re-cap then I decided to mount the two Dallas NV chips on sockets so that I could eventually back them up. I carefully extracted them with my Hakko 808 and installed them back into the sockets and now I am getting CPU board fail and cal fail on power up. what can I do? Is there a file I can download to re-program these two devices?


COLLUSION and The eBay microfiche sale

 

What you are all doing is colluding to deprive the seller from receiving the legitimate value for the item he is bidding on.
This is against eBay policy.

THIS STOPS NOW OR YOUR MEMBERSHIP IN TEKSCOPES WILL BE SUSPENDED.

Dennis Tillman
Moderator

-----Original Message-----
From: TekScopes@groups.io [mailto:TekScopes@groups.io] On Behalf Of phila_renewal
Sent: Thursday, September 05, 2019 12:43 PM
To: TekScopes@groups.io
Subject: Re: [TekScopes] The eBay microfiche sale

A legitimate joint venture, including all the venturers, cannot conspire with itself. No special formalities are needed to form the joint venture, but a writing (like a bunch of emails, for instance, which seem to exist already) would be helpful as evidence of the formation of the venture. One touchstone would be unitary decisionmaking of the venture, in other words, appoint a hierarchy of decisionmaking people or person for the venture and none of the venturers make independent decisions outside that hierarchy. The venture becomes the center of decisionmaking and economic power wholly apart and superior to any of the joint venturers. If the aim is to pool funds among the venturers and make a bid, hard to see an anticompetitive effect — the pooled bid by definition as an aggregation of the venturers’ funds will exceed any bid any one of them would have made.

See, e.g., Copperweld v. Independence Tube, Texaco v. Dagher; but see American Needle v. NFL (rule of reason analysis may apply).





--
Dennis Tillman W7PF
TekScopes Moderator


THM 570 Help needed

greenboxmaven
 

I discovered a dead THM-570 I had stashed away a few years ago. I had not paid it any attention because I thought it was not complete. After looking at it again, I am fairly certain it is complete. It will not turn on. It draws a small condenser charging pulse when the power is first connected, but nothing will cause it to turn on or even draw current. Does anyone have the repair manual, or at least the power supply section? Thanks, Bruce KA2IVY


KISS-488

Steve Hendrix
 

KISS-488 (HPIB/GPIB/IEEE-488 to Ethernet, with included HPGL plotter emulator) is back in stock! If you use a USA mailing address and contact me directly or as a member of a user group, I'll discount it $10. Direct (non-eBay) orders of 5 or more get an additional $10 off per unit. For international shipping, going thru eBay's international shipping program is the cheapest way to get it to you. Dave Jones' YouTube video at https://www.youtube.com/watch?v=WC1YT66c9KM ( https://www.youtube.com/watch?v=WC1YT66c9KM ) does a very nice job of showing off the features to give you a feel for the device to decide whether it suits your purposes. Thank you for looking!

Steve Hendrix


Re: 2247A PSU Troubleshooting

nielsentelecom@sbcglobal.net
 

Chuck,

You bring up a great point about the sweat within the latex glove. IF it should get torn, I have very conductive skin there.

Your still under the impression that I have my hand gloved in the linesman glove after I clearly stated that I didn't. The linesman glove is used as a insulated sleeve for the HT anode lead. You state in one paragraph that I am overboard for the protection, and in later paragraph I am not because I am improvising safety.

You also imply DC is safe because it won't cause fatal rhythm? I am also concerned on a kneejerk reaction if I got hit by the HT DC. I'm not going to determine the available current. It doesn't matter to me.

The last paragraph was a real jab. You don't have enough information about me to back that up. I have formal military electronics training, Utility lineman's training, I have proof tested my own lineman's gloves with a HV tester that used water within the glove and and the glove was also in water. The voltage potentials were applied to the two water envelopes. Performed underwater cable splices capable of 5KV AC without pressurizing the cable, these splices are good for 15 years or more.

And yes, I have studied legitimate sources.

NielsenTelecom


Reading Tek DSA 602A STO*.W04 Files

Curlytronics
 

Is there any way to read/convert a STO*.W04 file -- from a Tek DSA 602A 3.5" floppy -- on a Win 7 PC?

Curly


22xx service bulletin for removing p9070 molex & directly wiring to Q9070?

guy232
 

TL;DR: I've seen users mentioning in old posts about the 22xx scopes having an official mod released by tek for removing the white p9070 molex connector and direct soldering the 3 wires to Q9070. Anyone happen to know of a source for this bulletin?

-----
In each instance this has been mentioned in old group posts, the users have said they weren't able to find the document at that moment.

Searching hasn't yielded much results apart from finding the above mentioned threads.

As a novice I may be over thinking this but just wanted to see if I could find the bulletin in case it discusses things/methods that I may be unaware of. Such as lead dressing, what type of mechanical connection to make (someone mentioned he just lap soldered the wires, but I'm unsure if that is the proper way?) etc

Thanks for your time fellas, will update if I manage to track this down.

Tags: 2213a 2215a 2235


Re: 576 HV transformer problems - something to ponder

greenboxmaven
 

It was not a pure brilliant red, sort of a translucent reddish brown. I will guess different manufacturers or batches of the condensers could vary considerably in color, especially if they are translucent. I never thought to douse the lights and see if the flashover was visible.

Bruce, KA2IVY

On 9/4/19 11:59 PM, Glenn Little wrote:
Was the cap red?
I had a 453 MOD703H with no HV.
Found the red doorknob 500 pF HV filter cap had arced internally (saw the blackened area through the translucent red epoxy).
Replaced the cap with a ceramic 500 pF doorknob cap and the scope has worked fine since.
This was about 20 years ago.

Glenn

On 9/4/2019 3:35 PM, greenboxmaven via Groups.Io wrote:
I was doing some cleaning up in my shop and came across something?? from a Tektronix 454 scope that resonates with this transformer discussion. I think "contaminated" epoxy?? may have caused another problem in a scope high voltage power supply. The 454 had several problems that were easy to find and remedy. It still would not give anything more than a very pale glow on the screen. The second anode voltage was only about 2,000 volts. Disconnecting the transformer from the tripler circuit gave a husky corona arc to a screwdriver, so I began testing the diodes and condensers in the multiplier circuit. As I reconnected each stage, the voltage incresed. Finally I reconnected the 500 PFD "doorknob" condenser,and the voltage plummited. Having worked on television receivers decades ago, I had several replacement condensers on hand, and installing one brought the scope to life with a dazzling trace. One of the NuVistors in the preamp was barely alive, so that channel could not be brought onto the screen. A replacement got the scope working very well. I took the condenser over to a friend who has a Hipot tester, and it was fine until the voltage reached about 2,000 volts. The condenser is rated at 20KV, and the voltage on it in the scope is 12KV. The bad condenser is epoxy molded, the 60 year old replacement is tan high voltage bakelite. I wonder if Tektronix specified or accepted an epoxy formula that goes bad?

?????????? Bruce Gentry, KA2IVY


On 9/3/19 9:23 AM, Chuck Harris wrote:
The epoxy changes and makes an already lossy situation even
worse.


-Chuck Harris








Harmonica connectors repair

EB4APL
 

Hi,

I have observed in my limited number of series 7000 scopes (only three)
that the plastic contact holders of these harmonica connectors
disintegrates easily when its color is blue. Maybe it is caused by a
degradation of the plastic due to the blue pigment.

I found an easy and also dirty cheap replacement for these: I use Dupont
.1" pitch connector housings. When I began my tests I supposed that I
would need to use some glue for retaining the contacts, but it is not
needed, the pins, which are mechanically different form the Dupont pins,
are retained by the retention mechanism.

Maybe this is widely known, but I never had read anything about it.

Regards,

Ignacio EB4APL



---
El software de antivirus Avast ha analizado este correo electrónico en busca de virus.
https://www.avast.com/antivirus


Re: 576 HV transformer problems - something to ponder

Glenn Little
 

Was the cap red?
I had a 453 MOD703H with no HV.
Found the red doorknob 500 pF HV filter cap had arced internally (saw the blackened area through the translucent red epoxy).
Replaced the cap with a ceramic 500 pF doorknob cap and the scope has worked fine since.
This was about 20 years ago.

Glenn

On 9/4/2019 3:35 PM, greenboxmaven via Groups.Io wrote:
I was doing some cleaning up in my shop and came across something?? from a Tektronix 454 scope that resonates with this transformer discussion. I think "contaminated" epoxy?? may have caused another problem in a scope high voltage power supply. The 454 had several problems that were easy to find and remedy. It still would not give anything more than a very pale glow on the screen. The second anode voltage was only about 2,000 volts. Disconnecting the transformer from the tripler circuit gave a husky corona arc to a screwdriver, so I began testing the diodes and condensers in the multiplier circuit. As I reconnected each stage, the voltage incresed. Finally I reconnected the 500 PFD "doorknob" condenser,and the voltage plummited. Having worked on television receivers decades ago, I had several replacement condensers on hand, and installing one brought the scope to life with a dazzling trace. One of the NuVistors in the preamp was barely alive, so that channel could not be brought onto the screen. A replacement got the scope working very well. I took the condenser over to a friend who has a Hipot tester, and it was fine until the voltage reached about 2,000 volts. The condenser is rated at 20KV, and the voltage on it in the scope is 12KV. The bad condenser is epoxy molded, the 60 year old replacement is tan high voltage bakelite. I wonder if Tektronix specified or accepted an epoxy formula that goes bad?

?????????? Bruce Gentry, KA2IVY


On 9/3/19 9:23 AM, Chuck Harris wrote:
The epoxy changes and makes an already lossy situation even
worse.


-Chuck Harris






--
-----------------------------------------------------------------------
Glenn Little ARRL Technical Specialist QCWA LM 28417
Amateur Callsign: WB4UIV wb4uiv@arrl.net 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: 2440 cal errors

Bob Albert
 

So replacing the battery might solve most of the problems...

On Tuesday, August 20, 2019, 08:19:55 AM PDT, Robert Simpson via Groups.Io <go_boating_fast=yahoo.com@groups.io> wrote:

OK,
Thanks, Bob


Re: production volumes

Jim Ford
 

TekWiki (www.w140.com/tekwiki/) says over 120,000 7A26's were produced.Jim Ford Sent from my Verizon, Samsung Galaxy smartphone

-------- Original message --------From: Sparky99 <jnolan@iprova.com> Date: 9/4/19 3:22 PM (GMT-08:00) To: TekScopes@groups.io Subject: [TekScopes] production volumes I was wondering if there is any information on the production numbers for products made by Tektronix.  Based on eBay a sales I get the feeling that things like the 7A26 were produced in very high numbers (in fact this is one of the few items I have seen a number for - I think 200,000 going from memory), whereas I can imagine earlier/less popular products, such as the 500 scopes, were a lot less.  Anyone have any info on production numbers?All the best,Julian


production volumes

Sparky99
 

I was wondering if there is any information on the production numbers for products made by Tektronix. Based on eBay a sales I get the feeling that things like the 7A26 were produced in very high numbers (in fact this is one of the few items I have seen a number for - I think 200,000 going from memory), whereas I can imagine earlier/less popular products, such as the 500 scopes, were a lot less. Anyone have any info on production numbers?

All the best,

Julian


Re: 555 restoration

Sparky99
 

Hi everyone, thanks for the replies - I investigated further tonight and indeed the red glow from both upper beam HV rectifiers disappears when the trace fades. I will investigate more tomorrow and post my findings!

Julian

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