Date   
Re: FS: sets of NOS concentric control knobs

Richard R. Pope
 

Hello all,
Please don't use all caps. It is rude and inconsiderate. Place it in it's own paragraph!
GOD Bless and Thanks,
rich!

On 12/19/2019 1:12 AM, Dennis Tillman W7PF wrote:
Hi Brad,
In the future please include a line that people can't miss (all capitals works well) indicating that interested parties should contact you directly (and provide your contact info). That way we keep unnecessary personal traffic off TekScopes.

Dennis Tillman W7PF

-----Original Message-----
From: Brad Thompson <brad.thompsonaa1ip@...>
To: TekScopes@groups.io <TekScopes@groups.io>
Cc: HP-Agilent-Keysight-equipment <HP-Agilent-Keysight-equipment@groups.io>
Sent: Wed, Dec 18, 2019 4:48 pm
Subject: [TekScopes] FS: sets of NOS concentric control knobs

Brad Thompson via Groups.Io wrote on 12/6/2019 10:29 A
Hello--
I'm offering FS sets of NOS concentric control knobs. These have longitudinally-grooved surfaces and black cursor markings which contrast nicely with the aluminum knob material.

The top knob has a black insert. Each knob gets secured to its control shaft by two .050-inch hex setscrews. A .jpg-format photo is available on request.

Bottom knob: 0.625 inches in diameter, 0.56 inches high, 0.25 inch through hole Top knob: 0.425 inches in diameter, 0.56 inches high, 0.125 inch blind hole.

(Please note that the knobs are made from aluminum, a conductive metal, and hence will pose a shock hazard if you're accustomed to the bad practice of floating the ungrounded chassis of an instrument.)

Each set comprises three top/bottom pairs and as a bonus while the supply lasts, four skirted plastic knobs with 0.125-inch brass-insert blind hole and one 0.050-inch setscrew.

I'm asking $10.00 per package (four two-piece knobsets), which includes USPS first-class mail to U.S. locations.

Questions welcomed, PayPal honored.
Thanks, and 73--

Brad AA1IP



Re: FS: sets of NOS concentric control knobs

 

Hi Brad,
In the future please include a line that people can't miss (all capitals works well) indicating that interested parties should contact you directly (and provide your contact info). That way we keep unnecessary personal traffic off TekScopes.

Dennis Tillman W7PF

-----Original Message-----
From: Brad Thompson <brad.thompsonaa1ip@...>
To: TekScopes@groups.io <TekScopes@groups.io>
Cc: HP-Agilent-Keysight-equipment <HP-Agilent-Keysight-equipment@groups.io>
Sent: Wed, Dec 18, 2019 4:48 pm
Subject: [TekScopes] FS: sets of NOS concentric control knobs

Brad Thompson via Groups.Io wrote on 12/6/2019 10:29 A
Hello--
I'm offering FS sets of NOS concentric control knobs. These have longitudinally-grooved surfaces and black cursor markings which contrast nicely with the aluminum knob material.

The top knob has a black insert. Each knob gets secured to its control shaft by two .050-inch hex setscrews. A .jpg-format photo is available on request.

Bottom knob: 0.625 inches in diameter, 0.56 inches high, 0.25 inch through hole Top knob: 0.425 inches in diameter, 0.56 inches high, 0.125 inch blind hole.

(Please note that the knobs are made from aluminum, a conductive metal, and hence will pose a shock hazard if you're accustomed to the bad practice of floating the ungrounded chassis of an instrument.)

Each set comprises three top/bottom pairs and as a bonus while the supply lasts, four skirted plastic knobs with 0.125-inch brass-insert blind hole and one 0.050-inch setscrew.

I'm asking $10.00 per package (four two-piece knobsets), which includes USPS first-class mail to U.S. locations.

Questions welcomed, PayPal honored.
Thanks, and 73--

Brad AA1IP




--
Dennis Tillman W7PF
TekScopes Moderator

Re: FS: sets of NOS concentric control knobs

Greg
 

Could you please send a photo?  Thank you.

-----Original Message-----
From: Brad Thompson <brad.thompsonaa1ip@...>
To: TekScopes@groups.io <TekScopes@groups.io>
Cc: HP-Agilent-Keysight-equipment <HP-Agilent-Keysight-equipment@groups.io>
Sent: Wed, Dec 18, 2019 4:48 pm
Subject: [TekScopes] FS: sets of NOS concentric control knobs

Brad Thompson via Groups.Io wrote on 12/6/2019 10:29 A
Hello--
I'm offering FS sets of NOS concentric control knobs. These have
longitudinally-grooved
surfaces and black cursor markings which contrast nicely with the
aluminum knob material.

The top knob has a black insert.  Each knob gets secured to its control
shaft by two
.050-inch hex setscrews. A .jpg-format photo is available on request.

Bottom knob: 0.625 inches in diameter, 0.56 inches high, 0.25 inch
through hole
Top knob: 0.425 inches in diameter, 0.56 inches high, 0.125 inch blind
hole.

(Please note that the knobs are made from aluminum, a conductive metal,
and hence will pose a shock hazard if you're accustomed to the bad practice
of floating the ungrounded chassis of an instrument.)

Each set comprises three top/bottom pairs and as a bonus while
the supply lasts, four skirted plastic knobs with 0.125-inch
brass-insert blind hole and one 0.050-inch setscrew.

I'm asking $10.00 per package  (four two-piece knobsets), which includes
USPS first-class mail to U.S. locations.

Questions welcomed, PayPal honored.
Thanks, and 73--

Brad  AA1IP

FS: sets of NOS concentric control knobs

Brad Thompson
 

Brad Thompson via Groups.Io wrote on 12/6/2019 10:29 A
Hello--
I'm offering FS sets of NOS concentric control knobs. These have longitudinally-grooved
surfaces and black cursor markings which contrast nicely with the aluminum knob material.

The top knob has a black insert.  Each knob gets secured to its control shaft by two
.050-inch hex setscrews. A .jpg-format photo is available on request.

Bottom knob: 0.625 inches in diameter, 0.56 inches high, 0.25 inch through hole
Top knob: 0.425 inches in diameter, 0.56 inches high, 0.125 inch blind hole.

(Please note that the knobs are made from aluminum, a conductive metal,
and hence will pose a shock hazard if you're accustomed to the bad practice
of floating the ungrounded chassis of an instrument.)

Each set comprises three top/bottom pairs and as a bonus while
the supply lasts, four skirted plastic knobs with 0.125-inch
brass-insert blind hole and one 0.050-inch setscrew.

I'm asking $10.00 per package  (four two-piece knobsets), which includes
USPS first-class mail to U.S. locations.

Questions welcomed, PayPal honored.
Thanks, and 73--

Brad  AA1IP

Re: Tek 2465 Problem

GerryR
 

I had a similar, but not the same, problem when calibrating my 2465A and traced it to a channel 2 relay in the input module. The problem ended up being a burr on one of the relays the was digging into the plastic housing, preventing the relay from changing state. You can see pictures of what I did here:
https://www.eevblog.com/forum/testgear/tek-2465a-question/25/

After correcting the problem, it calibrated fine.

GerryR
KK4GER

----- Original Message -----
From: "Chuck Harris" <cfharris@...>
To: <TekScopes@groups.io>
Sent: Tuesday, December 17, 2019 8:45 PM
Subject: Re: [TekScopes] Tek 2465 Problem


Probes shouldn't make any difference to the ability
of the scope to trigger.

However, depending on whether the probe is a 1X, or
a 10X probe, different attenuator sections in the scope
will be used. The attenuator relays get thin films of
corrosion on their gold leads, and sometimes won't switch
reliably.

If the scope wasn't working properly, QService should not
have calibrated it until it was... It really isn't possible
to complete calibration with problems like you are describing.

I fix a lot of my customer's scopes that were supposedly
working perfectly, and were ready for calibration, but
had problems found during calibration. This is normal.

Bear in mind that the opamps you were probing are intended
to be sample and hold cells. The opamp is a unity gain
follower, with essentially infinite input impedance. It
is measuring the charge put in the hold capacitor by the mux.
The hold capacitor is only about 0.1uf, and will discharge
almost instantly when loaded by the input impedance of a DMM
or a scope probe.

-Chuck Harris

Panos wrote:
Yeah maybe it's better to do so. Nevertheless I thought about making an effort, since after the calibration the oscilloscope is working properly, apart from this detail.
To be fair opposite to QService, the calibration cost did not include any minor repairs to the machine.

In the meantime as I looking the reason for this problem, I made some progress. As I check the waveforms around the U500-U700-U800 according to the service manual, I see some instabilities on the signal during the interference.

Specific from the Inverted A Trigger output of U500 pin 18 to Trigger In of U700 pin 2.
After the same from the ramp output of U700 pin 35 to the A Sweep Input of the U735 pin 9.
Finally the same from the U735 pin3 to U800 A Sweep Input pin18.

That gave me the idea to look before the U500 the the trigger level lines A and B. There in A5 digital board, is a double operational amplifier marked as TL072, which drive the A and B trigger lines to U500.
Measuring the amplifier input and output with a voltmeter, I was surprised by the very low voltage across the full range of the trigger level control knob. The measurement was lower than +/- 500 mVolt across the range and in the trigger status about 200 mVolt in line A, contrary to 2.5 volt and 600 mVolt of line B.

I replaced the TL072 operational amplifier and now things was improved! As for the level of the voltage during trigger moment came at the same level for both A and B lines. About 600 mVolt.
Although it seemed that the problem was completely solved, something strange appeared using a different type probe.
As a remind, the interference was appeared when the volt/div selector was in the range of 20 mVolt and below (200 in my case using a x10 probe).

But enough with the written. I have to make a video.




Re: telonics sweep generator

Dave Seiter
 

You mean the power cord?  If so, Belden used to stock them, but probably not any more.  A lot of equipment from the sixties used them, particularly HP, and I've heard there are two different pinouts...  I always look for them at estate sales with related goods for sale.
-Dave

On Monday, December 16, 2019, 08:33:32 PM PST, battyhugh <@Hugh> wrote:

Thanks Dave - I'll try the eBay link first - where can I get the old
style 3 pin plug?

Re: Tek 2465 Problem

Chuck Harris
 

Probes shouldn't make any difference to the ability
of the scope to trigger.

However, depending on whether the probe is a 1X, or
a 10X probe, different attenuator sections in the scope
will be used. The attenuator relays get thin films of
corrosion on their gold leads, and sometimes won't switch
reliably.

If the scope wasn't working properly, QService should not
have calibrated it until it was... It really isn't possible
to complete calibration with problems like you are describing.

I fix a lot of my customer's scopes that were supposedly
working perfectly, and were ready for calibration, but
had problems found during calibration. This is normal.

Bear in mind that the opamps you were probing are intended
to be sample and hold cells. The opamp is a unity gain
follower, with essentially infinite input impedance. It
is measuring the charge put in the hold capacitor by the mux.
The hold capacitor is only about 0.1uf, and will discharge
almost instantly when loaded by the input impedance of a DMM
or a scope probe.

-Chuck Harris

Panos wrote:

Yeah maybe it's better to do so. Nevertheless I thought about making an effort, since after the calibration the oscilloscope is working properly, apart from this detail.
To be fair opposite to QService, the calibration cost did not include any minor repairs to the machine.

In the meantime as I looking the reason for this problem, I made some progress. As I check the waveforms around the U500-U700-U800 according to the service manual, I see some instabilities on the signal during the interference.

Specific from the Inverted A Trigger output of U500 pin 18 to Trigger In of U700 pin 2.
After the same from the ramp output of U700 pin 35 to the A Sweep Input of the U735 pin 9.
Finally the same from the U735 pin3 to U800 A Sweep Input pin18.

That gave me the idea to look before the U500 the the trigger level lines A and B. There in A5 digital board, is a double operational amplifier marked as TL072, which drive the A and B trigger lines to U500.
Measuring the amplifier input and output with a voltmeter, I was surprised by the very low voltage across the full range of the trigger level control knob. The measurement was lower than +/- 500 mVolt across the range and in the trigger status about 200 mVolt in line A, contrary to 2.5 volt and 600 mVolt of line B.

I replaced the TL072 operational amplifier and now things was improved! As for the level of the voltage during trigger moment came at the same level for both A and B lines. About 600 mVolt.
Although it seemed that the problem was completely solved, something strange appeared using a different type probe.
As a remind, the interference was appeared when the volt/div selector was in the range of 20 mVolt and below (200 in my case using a x10 probe).

But enough with the written. I have to make a video.




Re: Tek 2465 Problem

Panos
 

Yeah maybe it's better to do so. Nevertheless I thought about making an effort, since after the calibration the oscilloscope is working properly, apart from this detail.
To be fair opposite to QService, the calibration cost did not include any minor repairs to the machine.

In the meantime as I looking the reason for this problem, I made some progress. As I check the waveforms around the U500-U700-U800 according to the service manual, I see some instabilities on the signal during the interference.

Specific from the Inverted A Trigger output of U500 pin 18 to Trigger In of U700 pin 2.
After the same from the ramp output of U700 pin 35 to the A Sweep Input of the U735 pin 9.
Finally the same from the U735 pin3 to U800 A Sweep Input pin18.

That gave me the idea to look before the U500 the the trigger level lines A and B. There in A5 digital board, is a double operational amplifier marked as TL072, which drive the A and B trigger lines to U500.
Measuring the amplifier input and output with a voltmeter, I was surprised by the very low voltage across the full range of the trigger level control knob. The measurement was lower than +/- 500 mVolt across the range and in the trigger status about 200 mVolt in line A, contrary to 2.5 volt and 600 mVolt of line B.

I replaced the TL072 operational amplifier and now things was improved! As for the level of the voltage during trigger moment came at the same level for both A and B lines. About 600 mVolt.
Although it seemed that the problem was completely solved, something strange appeared using a different type probe.
As a remind, the interference was appeared when the volt/div selector was in the range of 20 mVolt and below (200 in my case using a x10 probe).

But enough with the written. I have to make a video.

Re: telonics sweep generator

battyhugh
 

Thanks Dave - I'll try the eBay link first - where can I get the old style 3 pin plug?

Re: telonics sweep generator

battyhugh
 

Thanks for that - I'll chase up the link.

Re: Tek 2465 Problem

Harvey White
 

Some of the trigger settings have high pass or low pass filters, and can be sensitive to the frequency of the waveform.

Harvey

On 12/16/2019 2:58 PM, Panos wrote:
Hi Chuck,
Yes I have a problem about the trigger in the vertical amplitude in 200 mV and below, AC or DC input coupling at any horizontal timing setting. This will disappear only if I set Noise or HF Rejection coupling. On screen it look like a second sweep identical to the main sweep during the trigger in a signal. This happen at any of the two first input channels 1 or 2.

Initially I did not understand what exactly was the problem, because I was using the calibrator of oscilloscope with my x10 probe as a source.
So during the triggering I was seeing the upper and lower faces of the square wave sweep signal to roll like a straight line left or right on the screen.
I have checked the output of my calibrator on another (Protek) oscilloscope, and the trigger working perfect in all horizontal settings.

So I thought to feed the same amplitude signal 400mV p-p in my oscilloscope from my CFG253 external generator, using a sawtooth or sinewave signal at 1KHz.
Τhen the second waveform was clearly visible.
This second waveform will be moved left or right on screen using the trigger level, but never disappear except if I using the Noise or HF Rejection coupling setting.
It looks like it can't work correctly the trigger level, or better off having a poor trigger.

Maybe i will be better to do a video about this as you will better understand what I mean.

As a memo must I inform you that in this oscilloscope all the PSU capacitors have been replaced with alternate Nichicon type, and also have been calibrated before 15 days from QService.

Panos



Re: Tek 2465 Problem

Chuck Harris
 

If your scope was calibrated 15 days ago by Q-Service, you
need to get it back to them.

I have a suspicion that what you are describing is a retrace
problem (Z-Axis), but, I am having some trouble following your
meaning.

Whatever the problem, it should have been discovered when the
calibration was done.

-Chuck Harris

Panos wrote:

Hi Chuck,
Yes I have a problem about the trigger in the vertical amplitude in 200 mV and below, AC or DC input coupling at any horizontal timing setting. This will disappear only if I set Noise or HF Rejection coupling. On screen it look like a second sweep identical to the main sweep during the trigger in a signal. This happen at any of the two first input channels 1 or 2.

Initially I did not understand what exactly was the problem, because I was using the calibrator of oscilloscope with my x10 probe as a source.
So during the triggering I was seeing the upper and lower faces of the square wave sweep signal to roll like a straight line left or right on the screen.
I have checked the output of my calibrator on another (Protek) oscilloscope, and the trigger working perfect in all horizontal settings.

So I thought to feed the same amplitude signal 400mV p-p in my oscilloscope from my CFG253 external generator, using a sawtooth or sinewave signal at 1KHz.
Τhen the second waveform was clearly visible.
This second waveform will be moved left or right on screen using the trigger level, but never disappear except if I using the Noise or HF Rejection coupling setting.
It looks like it can't work correctly the trigger level, or better off having a poor trigger.

Maybe i will be better to do a video about this as you will better understand what I mean.

As a memo must I inform you that in this oscilloscope all the PSU capacitors have been replaced with alternate Nichicon type, and also have been calibrated before 15 days from QService.

Panos



Re: Tek 2465 Problem

Panos
 

Hi Chuck,
Yes I have a problem about the trigger in the vertical amplitude in 200 mV and below, AC or DC input coupling at any horizontal timing setting. This will disappear only if I set Noise or HF Rejection coupling. On screen it look like a second sweep identical to the main sweep during the trigger in a signal. This happen at any of the two first input channels 1 or 2.

Initially I did not understand what exactly was the problem, because I was using the calibrator of oscilloscope with my x10 probe as a source.
So during the triggering I was seeing the upper and lower faces of the square wave sweep signal to roll like a straight line left or right on the screen.
I have checked the output of my calibrator on another (Protek) oscilloscope, and the trigger working perfect in all horizontal settings.

So I thought to feed the same amplitude signal 400mV p-p in my oscilloscope from my CFG253 external generator, using a sawtooth or sinewave signal at 1KHz.
Τhen the second waveform was clearly visible.
This second waveform will be moved left or right on screen using the trigger level, but never disappear except if I using the Noise or HF Rejection coupling setting.
It looks like it can't work correctly the trigger level, or better off having a poor trigger.

Maybe i will be better to do a video about this as you will better understand what I mean.

As a memo must I inform you that in this oscilloscope all the PSU capacitors have been replaced with alternate Nichicon type, and also have been calibrated before 15 days from QService.

Panos

Re: 2465 manuals - which is considered best? most searchable? through? etc.

GerryR
 

I have the 2465A manuals, op and service, and can not find any of what Mr. Panos sited in his inquiry, as well. But the manual I have is accurate as applied to my 2465A 'scope.
GerryR
KK4GER

----- Original Message -----
From: "Lawrance A. Schneider" <llaassllaaass@...>
To: <TekScopes@groups.io>
Sent: Monday, December 16, 2019 2:06 PM
Subject: [TekScopes] 2465 manuals - which is considered best? most searchable? through? etc.


Below please find a list of my 2465 - 67 manuals. I have others, but what I want to know is how do they differ. i.e NOT ONE IS IDENTICAL TO ANOTHER. I know I can compare them in bbedit or vi and others, but that is not my point. When someone cites a specific section of the manual by page or whatever, to which manual are they referring?

Mr Harris referenced: CA3046 transistor arrays. I find no such reference. Mr. Panos cited: Waveforms 28 and 46 on pages 238 and 239 in service manual. These appears in diagram No 5 in page 244.

I don't have anything relative to waveforms on pages 238 nor 239 nor 244. I do find a pulse waveform adjacent an hexagonal 28 within labeled "AUTO W/NO TRIGGER" and again hexagonal 46 unlabeled but they are on page 424.

Here is my list:

2465B - 2467B portable oscilloscope service manual 070-6863-00 no search.pdf
2465B - 2467B text_searchable 070-6863-00 somewhat search.pdf
2465B & 2467B Oscilloscopes 070-6863-01 Service Manual
2465B options and operator manual.pdf
2465B_2467B
2465B_2467B_Service_1993 070-6863-01.pdf
2465B-2467B_HI_TEXT.pdf
2465B, 2455B, 2445B Oscilloscopes and options Operators Manual (May 88) the manual number70-6860-00
2467B Library_text searchable 070-6861-00.pdf
2467B Ops text searchable.pdf

As a group, do we have a source to which we refer? In my list you may notice the manual number such as: 070-6863-00 BUT!!! 070-6863-00 and 070-6863-01 are called Service Manual when you open either. You my note I added at the end of a line: searchable or no search. That is, some I can search for "waveforms" and others I cannot.

Thank you, larry

2465 manuals - which is considered best? most searchable? through? etc.

Lawrance A. Schneider
 

Below please find a list of my 2465 - 67 manuals. I have others, but what I want to know is how do they differ. i.e NOT ONE IS IDENTICAL TO ANOTHER. I know I can compare them in bbedit or vi and others, but that is not my point. When someone cites a specific section of the manual by page or whatever, to which manual are they referring?

Mr Harris referenced: CA3046 transistor arrays. I find no such reference. Mr. Panos cited: Waveforms 28 and 46 on pages 238 and 239 in service manual. These appears in diagram No 5 in page 244.

I don't have anything relative to waveforms on pages 238 nor 239 nor 244. I do find a pulse waveform adjacent an hexagonal 28 within labeled "AUTO W/NO TRIGGER" and again hexagonal 46 unlabeled but they are on page 424.

Here is my list:

2465B - 2467B portable oscilloscope service manual 070-6863-00 no search.pdf
2465B - 2467B text_searchable 070-6863-00 somewhat search.pdf
2465B & 2467B Oscilloscopes 070-6863-01 Service Manual
2465B options and operator manual.pdf
2465B_2467B
2465B_2467B_Service_1993 070-6863-01.pdf
2465B-2467B_HI_TEXT.pdf
2465B, 2455B, 2445B Oscilloscopes and options Operators Manual (May 88) the manual number70-6860-00
2467B Library_text searchable 070-6861-00.pdf
2467B Ops text searchable.pdf

As a group, do we have a source to which we refer? In my list you may notice the manual number such as: 070-6863-00 BUT!!! 070-6863-00 and 070-6863-01 are called Service Manual when you open either. You my note I added at the end of a line: searchable or no search. That is, some I can search for "waveforms" and others I cannot.

Thank you, larry

Re: Paying it forward with David's Part's Exchange

David Berlind
 

Here's the crazy thing. Most of these parts just came with the things I
really wanted: 5 parts bins. I needed more bins to keep the parts that I
actually use. The guy sold them to me for $5 each and then he gave me 3 or
4 boxes just full of other stuff to go with it. For example, I think I have
about 200 brand new, individually wrapped banana jack extenders. But the
drawers in the bins were full. As I go through the inventory of stuff, some
of these parts sell for $3 or $4 each and I have anywhere between 10 and 40
of each. I'm guessing it's several thousand dollars in inventory that I got
for 25 bucks.

On Sun, Dec 15, 2019 at 9:40 PM nonIonizing EMF <nonionizingemf@...>
wrote:

I recently ordered some components with the same thought and intent,
needed about 8 and had to order 50, though I noted on Hackaday. I'll
email you to update the list with the components I have once I get a more
accurate inventory. I have a bunch of 0603 SMD components also. Thanks
David.



Re: TM5xx/TMxxx Pass Transistors. SUBJECT CHANGE, WAS: DC-508 repair advice

Dave Seiter
 

Thanks, Dennis!
I hadn't seen this list before, and I'm sure it will come in handy.
-Dave

On Sunday, December 15, 2019, 12:55:17 PM PST, Dennis Tillman W7PF <@Dennis_Tillman_W7pF> wrote:

Hi Michael and all TekScopes members,

As my late friend, Jerry Scheltgen (AKA Kilowatt on eBay), and I once documented, knowing which pass transistors are used in which TM500 / TM5000 mainframe, is not easy to figure out because Tek changed them often and some mainframes use different ones for no apparent reason. To make matters worse on some occasions Tek changed to a different transistor with ENTIRELY DIFFERENT lead order so they require contortions to reorient the leads to make them reach the holes the old leads went into.

To solve this mess in 8/2014, Jerry and I documented which pass transistors were used where and when you had to be careful because the lead orientation mattered.

I uploaded the list we created just now. It can be found at
https://groups.io/g/TekScopes/files/TM5xxx%20Pass%20Transistor%20List.pdf

If you search our archives of messages regarding any topic with "pass transistors" you will find several recommendations our members made for "better" or "more powerful" or "more sensitive" or "less expensive" or "more available" substitutes for what Tek used. The only consideration I would caution that you observe it is desirable (to prevent oscillation) that the pass transistor have a low cutoff frequency (Ft). Less than 1 MHz would be ideal.

Dennis Tillman W7PF
   
-----Original Message-----
From: TekScopes@groups.io [mailto:TekScopes@groups.io] On Behalf Of Mlynch001
Sent: Sunday, December 15, 2019 11:51 AM
Subject: Re: [TekScopes] DC-508 repair advice

The hard part is finding replacement transistors for the pass transistors.  I blew one up by plugging one of my plugins onto my extension cable upside down.  The plugin extension did not have an indexing pin, so it would fit either way. 
--
Michael Lynch
Dardanelle, AR




--
Dennis Tillman W7PF
TekScopes Moderator

Re: telonics sweep generator

Dave Seiter
 

I Have a Telonics SM2000 that I've never really played with.  I might have it's manual, I don't remember.
-Dave

On Sunday, December 15, 2019, 07:24:03 PM PST, battyhugh <@Hugh> wrote:

Hi  I have a Telonics 2003 sweep generator - has anyone still got one? - or a manual. I have had it for years mouldering away in the store room. As it is dual voltage - I can run it here (but the original 3 pin plug seems unobtainable) - it's a beautiful piece of late 1960's US technology  - and I'd like to get it going.
(that's what spectrum analysers are for!) - thanks and Cheers
Hugh

Re: Tek 2465 Problem

Chuck Harris
 

Is your scope working properly, or is it having some sort
of problem?

There are frequently problems with the CA3046 transistor
arrays, which will cause glitching in the CH1 and 2 traces
when they fail in the little addition around CH5 of the
channel hybrid.

-Chuck Harris

Panos wrote:

Hello to all.
Taking some measurements on my TEK 2465 using another oscilloscope, I see something strange.

I read for CHN5B signal -1,2 Volt versus -3,6 Volt. This only with BW LIMIT off.
Also for CHN 5A I read signal 600mV p-p versus -6 Volt as look at waveforms on service manual.

Am I doing something wrong, or I have problem somewhere in my TEK scope?

Waveforms 28 and 46 in pages 238 and 239 in service manual. These appears in diagram No 5 in page 244.



Re: telonics sweep generator

Glenn Little
 

On 12/15/2019 10:23 PM, battyhugh wrote:
Hi I have a Telonics 2003 sweep generator - has anyone still got one? - or a manual. I have had it for years mouldering away in the store room. As it is dual voltage - I can run it here (but the original 3 pin plug seems unobtainable) - it's a beautiful piece of late 1960's US technology - and I'd like to get it going.
(that's what spectrum analysers are for!) - thanks and Cheers
Hugh


--
-----------------------------------------------------------------------
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"