Date   
130 LC meter

Bob Albert
 

Is there anyone familiar with this unit? I have one that isn't working and have traced the problem to the variable oscillator not oscillating.

It's plate voltage is too low but everything seems good otherwise. Too low for enough gain to oscillate. The tubes are good and the transformer resonates. There is less than one volt on the plate of V4A.

260-2500-00 Encoder

Sergey Kubushyn
 

There was some announcement a year or so ago that somebody has several of
those in stock. Don't know who it was and if there are still some available
bue I need one for my recently acquired CG5011 that arrived with a broken
inner shaft, Variable control.

If somebody has this one I will be happy to pay a reasonable price and
shipping from anywhere on on Earth. A front panel with that encoder intact
from an otherwise damaged CG5010/5011 would also do as well as non-working
CG5010/5011 at a reasonable price.

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

Re: Chart Recorder and Its Replacement

paul.delamusica@...
 

I did some testing on the terminals that supposedly provide the START signal. It turns out to be just a relay that closes when the recording starts and opens again when the scan is finished. The resistance goes from infinity to zero at START and goes infinity again at STOP, at least in theory. In reality, the instrument has other stepper motors going on and off. When that happens, the relay seems to be unable to hold down and goes open momentarily. The interruption is short enough so that a small capacitance could solve the problem, but is that what we supposed to do? Or is it an indication of some other problems, such as power supply going weak?

Re: 465B fan question

Robert Simpson
 

Received and installed a new Thermister and 15Ohm resistor. The fan does start up better but there is still a problem. Watching it carefully, I see that the fan shaft has about 1/32 inch forward and back movement. When the shaft is in (relative to the front of the scope), it starts fine. But when is is out (toward the back of the scope), it doesn't start, although will continue to spin if I manually start it. Maybe a warn thrust washer or weak magnet. I don't see how to get at the thrust washed due to all the wring in the inside (front of scope ) part of the fan housing. Any thoughts?
Bob

Re: 175 Curve Tracer Rear 9-Pin Connector

 

Hi :
It seem the data for ebay item were missing after I post them .
Add the ebay ID for easier find them .
RegardTony CheungOCT 19 2019

On Saturday, October 19, 2019, 02:29:09 AM GMT+8, Yiu On Tony C via Groups.Io <tonycheung_hk=yahoo.com@groups.io> wrote:

Hi :
Cable connector for the rear of 575 connection is a Amphenol 165-13 ( male ) , for the rear of 175 connection is a Amphenol 165-14 ( female ) , all those connection pin are occupied ( 9 connections ). original design do not have shielding at all , but it is recommended due to 58 years ago design may not consider such issue.
Also can find the connectors available at ebay :
Amphenol 165-13 Circular Connector 16513 | eBay

eBay item number:351435448017
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| $66.77 |  |

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Amphenol 165-13 Circular Connector 16513 | eBay

Amphenol 165-13 Circular Connector 16513 - New No Box. Circular Connector. 9 Pin Male.



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Amphenol 123-166-1826 165-Series / 165-14 Circular Connector Mil-Spec. b1 | eBay
eBay item number:173917828823

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| $38.40 |  |

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|  |
Amphenol 123-166-1826 165-Series / 165-14 Circular Connector Mil-Spec. b...

Our sales team Works diligently to price everything competitive. Or if you buy a part and it doesn't fit your ne...
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Rebuild Tek Cable for Tektronix 575 to 175 interconnection | eBay
eBay item number:264306657081

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| $200.00 |  |

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Rebuild Tek Cable for Tektronix 575 to 175 interconnection | eBay

It is a new build item for Tektronix 575 to 175 interconnection, which is no longer available anywhere.
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Above information may help ?
RegardTony CheungOCT 19 2019

    On Friday, October 18, 2019, 05:34:26 PM GMT+8, Craig Sawyers <c.sawyers@...> wrote:

I have a 175. It is pins

Craig

Does anyone know for certain if the 9-Pin connector on the rear of the 175 curve tracer is pins or
sockets?  Photos I have seen are not clear enough, and none of the manuals describe non-Tektronix
Amphenol connector part numbers.

Re: 175 Curve Tracer Rear 9-Pin Connector

 

Hi :
Cable connector for the rear of 575 connection is a Amphenol 165-13 ( male ) , for the rear of 175 connection is a Amphenol 165-14 ( female ) , all those connection pin are occupied ( 9 connections ). original design do not have shielding at all , but it is recommended due to 58 years ago design may not consider such issue.
Also can find the connectors available at ebay :
Amphenol 165-13 Circular Connector 16513 | eBay


|
|
|
| $66.77 | |

|

|
|
| |
Amphenol 165-13 Circular Connector 16513 | eBay

Amphenol 165-13 Circular Connector 16513 - New No Box. Circular Connector. 9 Pin Male.



|

|

|


Amphenol 123-166-1826 165-Series / 165-14 Circular Connector Mil-Spec. b1 | eBay


|
|
|
| $38.40 | |

|

|
|
| |
Amphenol 123-166-1826 165-Series / 165-14 Circular Connector Mil-Spec. b...

Our sales team Works diligently to price everything competitive. Or if you buy a part and it doesn't fit your ne...
|

|

|



Rebuild Tek Cable for Tektronix 575 to 175 interconnection | eBay


|
|
|
| $200.00 | |

|

|
|
| |
Rebuild Tek Cable for Tektronix 575 to 175 interconnection | eBay

It is a new build item for Tektronix 575 to 175 interconnection, which is no longer available anywhere.
|

|

|


Above information may help ?
RegardTony CheungOCT 19 2019

On Friday, October 18, 2019, 05:34:26 PM GMT+8, Craig Sawyers <c.sawyers@...> wrote:

I have a 175. It is pins

Craig

Does anyone know for certain if the 9-Pin connector on the rear of the 175 curve tracer is pins or
sockets?  Photos I have seen are not clear enough, and none of the manuals describe non-Tektronix
Amphenol connector part numbers.

CSA803A cal constants addresses in U500/U511

Albert Otten
 

As mentioned in other topics the 33 factory calibration constants in a CSA803A/B/C (and corresponding 11800 models) can be set, but not read, in U500/U511 using the GPIB command calcorrection. These constants get lost and replaced by zeros after severe T1331 error problems and "Dallas" battery replacement. When the constants addresses are known the NVRAM images could reveal whether a CSA likely still has its original calibration constants (not all zero).
In my CSA the addresses are, in sequence,
U511:784F, U500:7850, U511:7850, U500:7851, U511:7851, ... , U500:785F, U511:785F.
Time base firmware 4.01 .

I speculate that these "constants" get never changed (from zero for instance) by ordinary accuracy commands. I haven't checked that (yet).

Albert

Yahoo Groups are deleting all files in December

 

Hi Richard,
Thank you for the notice. I never received any notice from Yahoo about this (that was typical for Yahoo!) so your heads up was appreciated.

We moved everything over to Groups.io a long time ago and we have no connection with Yahoo ever since. So we will not be affected by anything Yahoo does.

Dennis Tillman W7PF
TekScopes Co-owner and Moderator

-----Original Message-----
From: Richard Tyner
Sent: Thursday, October 17, 2019 6:19 AM

I was not sure if any of the old group files might be be on Yahoo or not. Just wanted to let others know just in case

-----Original Message-----
From: Richard Tyner
Sent: Wednesday, October 16, 2019 12:06 PM

Yahoo has made the decision to no longer allow users to upload content to the Yahoo Groups site. Beginning October 21, you won't be able to upload any more content to the site, and as of December 14 all previously posted content on the site will be permanently removed. You'll have until that date to save anything you've uploaded.

73 Richard W4MCD



--
Dennis Tillman W7PF
TekScopes Moderator

Re: 175 Curve Tracer Rear 9-Pin Connector

Craig Sawyers
 

I have a 175. It is pins

Craig

Does anyone know for certain if the 9-Pin connector on the rear of the 175 curve tracer is pins or
sockets? Photos I have seen are not clear enough, and none of the manuals describe non-Tektronix
Amphenol connector part numbers.

Re: "liquid crystal driver" sighting

p mc
 

...or someone who got the postage down to reasonable.

Bravo, sir.

Re: "liquid crystal driver" sighting

Mlynch001
 

We will all be waiting To hear all about this little item.

--
Michael Lynch
Dardanelle, AR

Re: "liquid crystal driver" sighting

Glenn Little
 

I bought it.
I got the postage down to $15.00.
When it gets here I will get some better pictures, inside and out.

Glenn

On 10/17/2019 9:48 PM, p mc wrote:
Yeah, that.

But someone snagged it. Someone willing to pay for delivery by angel choir so I doubt they just wanted the 5A1xN plugins.

Someone here, perchance? TekWiki would like to hear from you...


--
-----------------------------------------------------------------------
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: "liquid crystal driver" sighting

Glenn Little
 

I bought it.
I got the postage down to $15.00.
When it gets here I will get some better pictures, inside and out.

Glenn

On 10/17/2019 9:48 PM, p mc wrote:
Yeah, that.

But someone snagged it. Someone willing to pay for delivery by angel choir so I doubt they just wanted the 5A1xN plugins.

Someone here, perchance? TekWiki would like to hear from you...


--
-----------------------------------------------------------------------
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: 175 Curve Tracer Rear 9-Pin Connector

Mlynch001
 

They are male pins on the one that I saw.

--
Michael Lynch
Dardanelle, AR

Re: "liquid crystal driver" sighting

p mc
 

Yeah, that.

But someone snagged it. Someone willing to pay for delivery by angel choir so I doubt they just wanted the 5A1xN plugins.

Someone here, perchance? TekWiki would like to hear from you...

Re: Smoking 2465B (Rifa/30-ohm) + Recap = PS will not start

Roy Thistle
 

On Thu, Oct 17, 2019 at 02:31 PM, Chuck Harris wrote:


Faston connectors are supposed to be rarely
mated
Hi Chuck:
Yes... I don't know about Pandas... but Fastons can bite back when you try to interrupt their mating!
Just the same, the Real McCoy, TE Faston is supposed to conform to UL-310... and so is speced as to the insertion and withdrawal force, for multiple insertions and withdrawals.The speced withdrawal force is hefty...about the same as the speced insertion force, which is about 20 pounds.
I've done the prying thing, when necessary... with mixed results...using a screwdriver, or pliers... or both...but, its sometimes hard to generate that kind of force, in tight fits, or without breaking something. And, I've never seen a sold tool to help do the withdrawal in the field. At least, TE doesn't seem to sell, or make one.
Does anyone know if their is an appropriate tool available?

175 Curve Tracer Rear 9-Pin Connector

Gary Robert Bosworth
 

Does anyone know for certain if the 9-Pin connector on the rear of the 175 curve tracer is pins or sockets? Photos I have seen are not clear enough, and none of the manuals describe non-Tektronix Amphenol connector part numbers.

Gary

Re: Smoking 2465B (Rifa/30-ohm) + Recap = PS will not start

tekscopegroup@...
 

Just finished reprogramming the FRAM with backup data and put it back into the scope, its once again working fine.
Time to put the cover back on.

Re: Smoking 2465B (Rifa/30-ohm) + Recap = PS will not start

tekscopegroup@...
 

Happy to report that I just swapped out the FRAM for the old original 1990 NVRAM, which I had completely forgotten about, and the error code went away.
Will try to erase and reprogram the FRAM, otherwise will just order a new one, plus another Aries adapter.

Re: Smoking 2465B (Rifa/30-ohm) + Recap = PS will not start

tekscopegroup@...
 

On Thu, Oct 17, 2019 at 02:41 PM, Chuck Harris wrote:
Is your supply loaded, or unloaded? Unloaded, all the
voltages will be low as the supply works feverishly trying
not to destroy itself.

-Chuck Harris
Chuck I only powered the supply while it was connected to the scope, never unloaded.

Anyway, I found a problem and now the power supply is working again. But I am being greeted now by a 04 11 error message which indicated a faulty cal constant checksum. Maybe the FRAN did not like the lower power supply voltages or spikes etc. When I swapped out the old NVRAM I also programmed a fresh one and put it away just in case the FRAM would not work out. But so far the FRAM had been in the scope for almost a year without any problems until now. Guess I could just swap in that new programmed NVRAM to confirm the error goes away, and then try to reprogram the data back into the FRAM.

What happened with the power supply? Well as said I had double/triple checked all caps, but... against my OWN NOTES which I had taken prior to start removing and replacing caps one by one. Turns out that in the case of C1220 and C1240 I read 10uF 100V but wrote down 100uF 10V. Then when it came to replace those two I grabbed a bag with two extra and somewhat different looking 100uF 25V separate from the other 100uF 25V caps that I was correctly using for the other spots. So I figured I had ordered these two extra ones just to "upgrade" those pesky 10V units up to 25V.

Found out when I left the power on for a few minutes and heard another pop. Upon inspection C1220 had vented its top. It was obliviously pulling down the 87V rail. Oooops...