Date   

Re: A hello and a 464.

 

On Thu, 31 Jan 2013 03:52:43 -0000, "renault9gta" <phil@viscom.net>
wrote:

. . .

Firstly, the trace isn't as sharp as either my Beckman nor what I remember of my Tek 585A that I had to leave back in the UK due to shipping weight.
In X/Y mode I can't get better than an egg-shaped dot (admittedly small but not a perfectly formed dot), which grows at a 45-ish degree angle into a figure 8 with focus and astigmatism controls on the front panel, and also with the trimpots inside, as per the manual.
The dot's shape can be improved by pulling the 25MHz bandwidth switch to limit bandwidth of the scope. This effect is most noticeable if a flat line is created by sending the channel into free-running.
Is this just a quirk of the circuit, or is it symptomatic of something failed or failing?
That could be caused by noise on the power supply lines. The aluminum
electrolytic output capacitors may be worn out. If excessive noise
from the same source gets into the vertical and horizontal circuit
paths while the oscilloscope is in XY mode, then the CRT dot will
become a 45 degree smudge.

Second, the fast mode does work but the trace stores considerably more brightly towards the right side of the screen. Turning the intensity of the trace up makes a good trace on the left but a very blurred image on the right. It can all be viewed by adjusting the STORAGE LEVEL dial, but it's not optimal. VAR PERS mode doesn't display this behavior.
I've never used one of these scopes before, so I don't know how they work(ed) when new and calibrated correctly. Again, this a quirk of the FAST mode or I have some testing and adjustment ahead?
I used a 464 many years ago and as I recall, the storage mode display
was never very clear and always prone to blooming.

The normal mode display was not the best either.


A hello and a 464.

renault9gta <phil@...>
 

Howdy all,

Sorry to introduce a seemingly random start into the group, but I'm stumbling a little with my new 464.

It is Tek 464 s/n B132625, with DM44 digital multimeter. I've been using a Tek probe (P1062B stamped on the body of the probe) coupled with a copy of the service manual (thanks, Kurt!).

I've dug through the archives but there's not a great deal of discussion about the 464.

It's got a little history- purchased new in 1978 by my current employers, maintained until 1990 and then shelved. It was finally written off the books and made its way into my ownership.

I checked as many voltages as I could- apart from the -1470V because I don't have a meter capable of reading it.
Only the calibration circuit was off, by about 5mV. Everything else was well within 0.5% of spec.

The front panel switches are a little dirty. I need to see about cleaning them. The pots are becoming less noisy with use.

The storage works, both on variable persistence and fast although the fast mode I believe I need to take a look at.

I have a limited amount of test equipment- a little Beckman 20MHz dual channel oscilloscope, a fairly new DMM, a "variac" style transformer with voltmeter and ammeter, an HP frequency counter and a Wavetek waveform generator that's so far out of calibration it's not much use beyond audio (what it was bought for).

I have two questions that I can't answer from the archive or the manual.

Firstly, the trace isn't as sharp as either my Beckman nor what I remember of my Tek 585A that I had to leave back in the UK due to shipping weight.
In X/Y mode I can't get better than an egg-shaped dot (admittedly small but not a perfectly formed dot), which grows at a 45-ish degree angle into a figure 8 with focus and astigmatism controls on the front panel, and also with the trimpots inside, as per the manual.
The dot's shape can be improved by pulling the 25MHz bandwidth switch to limit bandwidth of the scope. This effect is most noticeable if a flat line is created by sending the channel into free-running.
Is this just a quirk of the circuit, or is it symptomatic of something failed or failing?

Second, the fast mode does work but the trace stores considerably more brightly towards the right side of the screen. Turning the intensity of the trace up makes a good trace on the left but a very blurred image on the right. It can all be viewed by adjusting the STORAGE LEVEL dial, but it's not optimal. VAR PERS mode doesn't display this behavior.
I've never used one of these scopes before, so I don't know how they work(ed) when new and calibrated correctly. Again, this a quirk of the FAST mode or I have some testing and adjustment ahead?

Thanks, and again- hello all.

--Phil Andrews


Re: 475 Triggering Issue -- Will recent 468 Triggering Issue Thread Help Me?

stan_katz
 

Dave,

I got it now.

Thanks,

Stan

--- In TekScopes@yahoogroups.com, David wrote:

That is why I said in an earlier post, "Do not let the equipment
requirements or setup dissuade you as you can certainly complete it if
you can generate sine or triangle waveforms from 0.35 to 2 divisions."

All you need to do is connect the signal or function generator to the
channel 1 or channel 2 input with a short BNC patch cable and produce
a 50 kHz to 350 kHz sine or triangle wave with a CRT deflection of
0.35 divisions to 2 or 3 divisions. The vertical volts/div settings
are relatively unimportant because the internal trigger circuits see
exactly what is displayed on the CRT.

I would not worry about the external trigger calibration until you
verify that the internal trigger is working correctly and even then,
all that is really needed is a BNC T-connector to use as a splitter
and maybe an attenuator.

On Thu, 31 Jan 2013 00:23:28 -0000, "stan_katz"
wrote:

I can study the manual. What I can't do is figure out what cabling and interface devices I need. What's a 50ohm 5ns GR cable (GR stands for General Radio?). What's a 50ohm signal pickoff unit, GR to BNC adapter, X10 attenuator (a standalone cabled inline attenuator??). Sorry I'm so dense here, but I need help to cobble together whatever is alluded to here. All I have is a signal generator, and a bunch of 50ohm cables. I have a feeling if I were a ham radio guy, the above stuff would be obvious. Maybe someone can post Ebay links to whatever it is I should order. In the meantime, I'll continue to do my homework reading the manual.

Stan

--- In TekScopes@yahoogroups.com, "Max Mazza" wrote:

If you finally have a good and decent copy of the manual, you can finally do the work in a right manner.
The page relevant to you should be 5-40 and followings.
However I recommend to pause and read carefully the manual first, then proceed calmly.

The best sensitivity when adjusting R565 should be checked with the trigger level position to 0, not full clockwise, anyway. Fully clockwise implies that you raises the trigger level very above 0 V. The level spans from -8V to +5.2V. In normal operation the trigger level should be near 0. You can vary trigger level only if you knows what you are doing.... for instance, when there are noisy signals, they can generate spurious or false triggering; in that case it's obvious to raise the trigger level just above 0 level, up to the point where a stable waveform can be displayed.

Moreover, if you have touched R534 (A trig centering), it's easy that you have altered the 0 level for the trigger level knob....

Conclusion: study carefully the manual first, then resume the process on your 475. The calibration procedures are somewhat complicated in some cases, and they require a lot of patience and calm.
No problem if you want to contact me directly, but I think that it's better that you post your questions here, since "many brains are better tha one :-)

Don't rely strong on my suggestion to read +80mV, it's an extreme simplification to help you to make your scope functioning with the instrumentation in your possess. Read the manual first, then ask with no problem!

Max

--- In TekScopes@yahoogroups.com, "stan_katz" wrote:

I've finally downloaded REAL Tek 457 manual. MUCH better manual. Thanks Dave. Max, I think I've fiddled with R565 to get the best sensitivity possible. That is + trigger slope cranked fully clockwise, and max attenuation possible of .5v/div. I'll keep on trying to do better. I might try to upload sketches of the waveforms I now have to Archive 2. It would be easier to just email. Can I get permission to email direct?..Max?..Dave? As for detecting +80mv on my little D51, that's a stretch. Do my best tho.

Stan

Stan

Stan



------------------------------------

Yahoo! Groups Links



Re: Some Tek stuff available- save it from the flea market! 7704, 7CT1N, etc

raymonddompfrank <r.domp.frank@...>
 

Pity, still a bit disappointed. I wouldn't have minded a bidding "fight", in which I would have outbid Jerry's current bid.

Anyway, win some, lose some.

Raymond

--- In TekScopes@yahoogroups.com, "Jamie" wrote:

Hey jerry, was that $150? If so, consider it sold. Contact me via gmail- jamietyson@

Sorry Raymond, he beat you by seconds! I'll let you know if something changes.

jamie

--- In TekScopes@yahoogroups.com, jerry massengale wrote:

Jamie,

I offer !50 plus shipping for the 7ct1n





Jerry Massengale






-----Original Message-----
From: Jamie
To: TekScopes
Sent: Wed, Jan 30, 2013 6:35 pm
Subject: [TekScopes] Some Tek stuff available- save it from the flea market! 7704, 7CT1N, etc





I have an assortment of Tek 7k stuff that will be going to a flea market if no one here is interested. I hope I'm not breaking protocol by letting you know- if I am, I apologize and can do whatever is needed to comply.

I'm hoping these items can help someone rather than going for pennies locally. I've verified that the 7704 works. I plugged in the 7CT1N and I get a bunch of dots top to bottom with a 3906 transistor connected but no horizontal sweep, even with the cable plugged into the timebase. I don't really know how to operate it but from that little info I believe if it doesn't work it is close to being functional. I haven't really played with the other plugins but my experiences with other items from the same source (and former owner) tell me that they should be fine after some cleaning of switches and contacts.

Tektronix 7704A Oscilloscope Mainframe (works, verified)
Tektronix 7A18 Dual Trace Amp (works, verified)
Tektronix 7A22 Differential Amp
Tektronix 7B71 Delaying Time Base
Tektronix 7B70 Time Base (works, verified)
Tektronix 7CT1N Curve Tracer (works to some extent)
Tektronix 7A11 Amplifier
Tektronix 7A19 Amplifier
Tektronix 067-0616-00 Calibration Fixture-extender

If you're local you can pick up. If not I'll arrange shipping and payment off-list. Please make what you believe to be reasonable offers- I will do my best to not question them! If you need more info on a given item please contact me off-list.

Jamie (in Eastern PA, near Warminster, PA)


Re: Some Tek stuff available- save it from the flea market! 7704, 7CT1N, etc

 

Hi,

yes I must have been in a hurry. It is $150. I need one to test new adapter designs.


Jerry Massengale



-----Original Message-----
From: raymonddompfrank
To: TekScopes
Sent: Wed, Jan 30, 2013 6:46 pm
Subject: [TekScopes] Re: Some Tek stuff available- save it from the flea market! 7704, 7CT1N, etc

 

Jerry,
Is that $150 you're offering? I was hoping to have a chance offering $100 ncl. shipping to the Netherlands...

Raymond

--- In TekScopes@..., jerry massengale wrote:
>
> Jamie,
>
> I offer !50 plus shipping for the 7ct1n
>
>
>
>
>
> Jerry Massengale
>
>
>
>
>
>
> -----Original Message-----
> From: Jamie
> To: TekScopes
> Sent: Wed, Jan 30, 2013 6:35 pm
> Subject: [TekScopes] Some Tek stuff available- save it from the flea market! 7704, 7CT1N, etc
>
>
>
>
>
> I have an assortment of Tek 7k stuff that will be going to a flea market if no one here is interested. I hope I'm not breaking protocol by letting you know- if I am, I apologize and can do whatever is needed to comply.
>
> I'm hoping these items can help someone rather than going for pennies locally. I've verified that the 7704 works. I plugged in the 7CT1N and I get a bunch of dots top to bottom with a 3906 transistor connected but no horizontal sweep, even with the cable plugged into the timebase. I don't really know how to operate it but from that little info I believe if it doesn't work it is close to being functional. I haven't really played with the other plugins but my experiences with other items from the same source (and former owner) tell me that they should be fine after some cleaning of switches and contacts.
>
> Tektronix 7704A Oscilloscope Mainframe (works, verified)
> Tektronix 7A18 Dual Trace Amp (works, verified)
> Tektronix 7A22 Differential Amp
> Tektronix 7B71 Delaying Time Base
> Tektronix 7B70 Time Base (works, verified)
> Tektronix 7CT1N Curve Tracer (works to some extent)
> Tektronix 7A11 Amplifier
> Tektronix 7A19 Amplifier
> Tektronix 067-0616-00 Calibration Fixture-extender
>
> If you're local you can pick up. If not I'll arrange shipping and payment off-list. Please make what you believe to be reasonable offers- I will do my best to not question them! If you need more info on a given item please contact me off-list.
>
> Jamie (in Eastern PA, near Warminster, PA)
>


Re: A Tektronix scope I don't recognise on eBay ...

teamlarryohio
 

Yep, that's the animal.
-ls-

David <davidwhess@gmail.com> wrote:

That looks like a Tektronix T922R (15 MHz Dual Channel Single
Timebase) which is a rack mount T922:

http://www.logwell.com/tech/oscilloscopes/Tek_T922R.html
http://www.logwell.com/tech/oscilloscopes/t921_922_sm.pdf

On Thu, 31 Jan 2013 01:46:06 -0000, "David C. Partridge"
<david.partridge@perdrix.co.uk> wrote:

<http://cgi.ebay.co.uk/300854366441>

Can someone put me out of my misery?

Regards,
David Partridge

------------------------------------

Yahoo! Groups Links



Re: TDS 744A colour shutter

@Arcticgeek
 

No problem, if interested, just send me a message and I can send the EPROM files.

Mike

--- In TekScopes@yahoogroups.com, Chin Siang Lim wrote:

Hi,
I am interested to keep for future use.
Managed to clear out all the gel and shutter works, so using original
shutter.
As an insurance for the future, I better keep that firmware.
Cslim

On Thursday, January 31, 2013, miketakeguess wrote:

**




Jay,

I believe I can help.

I purchased the same panel as was mentioned in a earlier post from
ChinaToby on ebay over a year ago. It is a 7" 4:3 ratio 800x600 panel and
fits well.

As people have mentioned though, it does not remember the H and V settings
through a power cylce, but it does remember the brightness setting. Still,
this is not very useful because on the TDS scopes part of the menu is
chopped off.

After numerous emails to the ebay seller, I was finally able to solve my
problem. The problem resides in the firmware on the small A/D converter
board that is sold with the panel. There are 2 versions of firmware that
can be used on that converter board, their filenames for it are
AutoPosition1.bin and CARTV128.bin. Mine was shipped with the
AutoPosition1.bin firmware, and that code will lose the H,V settings every
power cycle.

The CARTV128.bin file, however, works well and remembers the H & V
settings. Updating the code, however, is somewhat cumbersome. Supposedly
there is a way to update the code with some sort of update cable, but I
have never located the cable dongle or the utility to do it.

However, I was able to remove the flash eprom off of the board and update
the code using my EPROM programmer. It's kludgy, but it works. I can send
someone the binary files if interested.

--- In TekScopes@yahoogroups.com
> 'TekScopes%40yahoogroups.com');>, "jayw_comark" wrote:

OK, I ended up buying the panel Dan mentioned below as I could never get
the screen settings to hold properly on that other panel someone
recommended. I just got new panel today, and it is a 16:9 panel, not a 4:3
panel! My bad as I should have pulled the datasheet for the panel I
suppose, although the listing states it is 4:3. So, I am now out $150 and
still don't have a workable solution. Argh!

Does anyone know for sure where a suitable 7" 640*480 4:3 LCD and
controller can be found for these scopes? Please? (whimper...)

Thanks.

Jay

--- In TekScopes@yahoogroups.com
> 'TekScopes%40yahoogroups.com');>, "jayw_comark" wrote:

Thanks Dan,

I'll fiddle around with this one for a bit, and if I don't get
anywhere with it, I'll give that one a try.

Weird, every LCD controller I've ever seen (And I've seen a lot as I
work in the industrial computer field) always saves the settings after a
power cycle. On this one, I can get everything all set up perfectly, then
remove the VGA cable from it and allow it to go to sleep. When I reconnect
the VGA cable, the settings are lost. So, not even a power cycle is
required. To me, this is a serious bug! Additionally, when I use the OSD
and select auto config, it still can't set the horizontal and vertical
properly.

Jay

--- In TekScopes@yahoogroups.com
> 'TekScopes%40yahoogroups.com');>, Dan Fish wrote:

I bought from nyjtouch (for example
http://www.ebay.com/itm/VGA-2AV-Reversing-LCD-Controller-7-INNOLUX-AT070TN92-50-Pin-Screen-800x480-TP-/280933816792?pt=US_Laptop_Screens_LCD_Panels&hash=item4168f5d9d8
about $60) and after doing the automatic screen size and automatic
video
setting, I have not had to touch it since. The screen angle was
default
as view-from-below and I left it there because I keep the scope on a
shelf above me. If you would rather view-from-above then figure that
out and reverse the screen before attaching to the scope.

Dan


Hi Picredburner,

I went ahead and bought one of thess LCDs and am having a bit of
trouble with it - hoping you may be able to help.

I got it to power up and display fine, and I was able to set the
brightness using the menu buttons. However, when it powers up the
vertical and horizontal are a bit off. I was able to adjust this
through the menu as well, but after a power cycle these settings
are
lost and I have to adjust both H and V again. Brightness settings
are
remembered, though. Did you have a similar problem?

Thanks.

Jay


Re: 7CT1N Modifications

 

Sure, as in why re-invent the...
 
:)
Tom

----- Original Message -----
From: David
Sent: Wednesday, January 30, 2013 8:41 PM
Subject: [TekScopes] 7CT1N Modifications

 

Wheel design?


Re: A Tektronix scope I don't recognise on eBay ...

 

That looks like a Tektronix T922R (15 MHz Dual Channel Single
Timebase) which is a rack mount T922:

http://www.logwell.com/tech/oscilloscopes/Tek_T922R.html
http://www.logwell.com/tech/oscilloscopes/t921_922_sm.pdf

On Thu, 31 Jan 2013 01:46:06 -0000, "David C. Partridge"
<david.partridge@perdrix.co.uk> wrote:

<http://cgi.ebay.co.uk/300854366441>

Can someone put me out of my misery?

Regards,
David Partridge


Re: A Tektronix scope I don't recognise on eBay ...

Tom Jobe <tomjobe@...>
 

It is a rack mount version of some common Tektronix scope you would probably recognize, and my first guess is a 422 which might have been called a 422R?
tom jobe...
 
 
 

----- Original Message -----
Sent: Wednesday, January 30, 2013 5:46 PM
Subject: [TekScopes] A Tektronix scope I don't recognise on eBay ...

 

http://cgi.ebay.co.uk/300854366441>

Can someone put me out of my misery?

Regards,
David Partridge


Re: TDS 744A colour shutter

cslim388
 

Hi, 
I am interested to keep for future use. 
Managed to clear out all the gel and shutter works, so using original shutter.
As an insurance for the future, I better keep that firmware.
Cslim

On Thursday, January 31, 2013, miketakeguess wrote:
 



Jay,

I believe I can help.

I purchased the same panel as was mentioned in a earlier post from ChinaToby on ebay over a year ago. It is a 7" 4:3 ratio 800x600 panel and fits well.

As people have mentioned though, it does not remember the H and V settings through a power cylce, but it does remember the brightness setting. Still, this is not very useful because on the TDS scopes part of the menu is chopped off.

After numerous emails to the ebay seller, I was finally able to solve my problem. The problem resides in the firmware on the small A/D converter board that is sold with the panel. There are 2 versions of firmware that can be used on that converter board, their filenames for it are AutoPosition1.bin and CARTV128.bin. Mine was shipped with the AutoPosition1.bin firmware, and that code will lose the H,V settings every power cycle.

The CARTV128.bin file, however, works well and remembers the H & V settings. Updating the code, however, is somewhat cumbersome. Supposedly there is a way to update the code with some sort of update cable, but I have never located the cable dongle or the utility to do it.

However, I was able to remove the flash eprom off of the board and update the code using my EPROM programmer. It's kludgy, but it works. I can send someone the binary files if interested.

--- In TekScopes@..., "jayw_comark" wrote:
>
> OK, I ended up buying the panel Dan mentioned below as I could never get the screen settings to hold properly on that other panel someone recommended. I just got new panel today, and it is a 16:9 panel, not a 4:3 panel! My bad as I should have pulled the datasheet for the panel I suppose, although the listing states it is 4:3. So, I am now out $150 and still don't have a workable solution. Argh!
>
> Does anyone know for sure where a suitable 7" 640*480 4:3 LCD and controller can be found for these scopes? Please? (whimper...)
>
> Thanks.
>
> Jay
>
> --- In TekScopes@..., "jayw_comark" wrote:
> >
> > Thanks Dan,
> >
> > I'll fiddle around with this one for a bit, and if I don't get anywhere with it, I'll give that one a try.
> >
> > Weird, every LCD controller I've ever seen (And I've seen a lot as I work in the industrial computer field) always saves the settings after a power cycle. On this one, I can get everything all set up perfectly, then remove the VGA cable from it and allow it to go to sleep. When I reconnect the VGA cable, the settings are lost. So, not even a power cycle is required. To me, this is a serious bug! Additionally, when I use the OSD and select auto config, it still can't set the horizontal and vertical properly.
> >
> > Jay
> >
> > --- In TekScopes@..., Dan Fish wrote:
> > >
> > > I bought from nyjtouch (for example
> > > http://www.ebay.com/itm/VGA-2AV-Reversing-LCD-Controller-7-INNOLUX-AT070TN92-50-Pin-Screen-800x480-TP-/280933816792?pt=US_Laptop_Screens_LCD_Panels&hash=item4168f5d9d8
> > > about $60) and after doing the automatic screen size and automatic video
> > > setting, I have not had to touch it since. The screen angle was default
> > > as view-from-below and I left it there because I keep the scope on a
> > > shelf above me. If you would rather view-from-above then figure that
> > > out and reverse the screen before attaching to the scope.
> > >
> > > Dan
> > >
> > > >
> > > > Hi Picredburner,
> > > >
> > > > I went ahead and bought one of thess LCDs and am having a bit of
> > > > trouble with it - hoping you may be able to help.
> > > >
> > > > I got it to power up and display fine, and I was able to set the
> > > > brightness using the menu buttons. However, when it powers up the
> > > > vertical and horizontal are a bit off. I was able to adjust this
> > > > through the menu as well, but after a power cycle these settings are
> > > > lost and I have to adjust both H and V again. Brightness settings are
> > > > remembered, though. Did you have a similar problem?
> > > >
> > > > Thanks.
> > > >
> > > > Jay
> > > >
> > >
> >
>


A Tektronix scope I don't recognise on eBay ...

 

<http://cgi.ebay.co.uk/300854366441>

Can someone put me out of my misery?

Regards,
David Partridge


7CT1N Modifications

 

Wheel design?

I have not played with the auxiliary Y axis modification yet but if it
works like I expect, then the 7CT1N could be left in one of the
horizontal slots and used without the external cable connection to a
vertical slot. I suspect a gain and zero trim will be needed for each
different mainframe though. The mainframe auxiliary Y axis signal
(pin 16B) is used by the 7B92 and 7B92A plug-in to for trace
separation.

On Wed, 30 Jan 2013 20:33:20 -0500, "Tom Miller"
<tmiller11147@verizon.net> wrote:

Hi David,

Can you document and post your progress on this modification? Maybe including pictures? I think many would benefit from your wheel design.

Regards,
Tom

----- Original Message -----
From: David
To: TekScopes@yahoogroups.com
Sent: Wednesday, January 30, 2013 8:24 PM
Subject: Re: [TekScopes] Re: Some Tek stuff available- save it from the flea market! 7704, 7CT1N, etc

"While being functional, the retractable cable is
annoyingly stiff and I am still planning on changing the connector. I
am tempted to try modifying it to use the mainframe auxiliary Y axis
input which is present on all of the plug-in slots.


Re: Some Tek stuff available- save it from the flea market! 7704, 7CT1N, etc

 

Hi David,
 
Can you document and post your progress on this modification? Maybe including pictures? I think many would benefit from your wheel design.
 
Regards,
Tom
 

----- Original Message -----
From: David
Sent: Wednesday, January 30, 2013 8:24 PM
Subject: Re: [TekScopes] Re: Some Tek stuff available- save it from the flea market! 7704, 7CT1N, etc

"While being functional, the retractable cable is
annoyingly stiff and I am still planning on changing the connector. I
am tempted to try modifying it to use the mainframe auxiliary Y axis
input which is present on all of the plug-in slots.


Re: Some Tek stuff available- save it from the flea market! 7704, 7CT1N, etc

 

On Thu, 31 Jan 2013 01:00:54 -0000, "Jamie" <jamietyson@gmail.com>
wrote:

That would be cool- we'll see if Jerry buys it or not. I should have posted "will trade for 5CT1N or 5L4N!" I have a bunch of 5k stuff- as an audio guy my 5k is fast enough for my uses (with a 454a when needed) and I have a 5D10 for anything I need to capture and really look at. Those two 5k plugs are not yet part of my collection!

I'm not in this to make a ton of money- I believe $150 is a fair price for a working 7CT1N as it's cheaper than any I've seen on ebay and I'm making money for a good cause. Maybe I should have put that in the sale thread- oops. These sales benefit the local ham club. I'm not a ham but a good friend is.

Hopefully Jerry will put it to good use!

Jamie

--- In TekScopes@yahoogroups.com, "raymonddompfrank" wrote:

Thanks, Jamie. Possibly, you could have sold the first ever 7CT1 to the Netherlands... ;)
I picked up a non-working but repairable 7CT1N for about that although
it came with a 7000 series mainframe as packing material which added
significantly to the shipping charges. UPS managed to drop the
mainframe on its front but the 7CT1N survived.

I had to clean and lubricate all of the pushbutton switches which were
sticking or frozen in place and replace the burnt out scale
illumination lamps. While being functional, the retractable cable is
annoyingly stiff and I am still planning on changing the connector. I
am tempted to try modifying it to use the mainframe auxiliary Y axis
input which is present on all of the plug-in slots.

I saw a 7CT1N go for $130 last year on Ebay.


Re: 485 No Trace - some progress, question

 

BTW the aa4df.com you currently see is just a domain name sales page, the only relationship to the aa4df.com that used to be is that the new page mentions manuals. It also only seems to work in IE.

Regards,
David Partridge
________________________________

From: TekScopes@yahoogroups.com [mailto:TekScopes@yahoogroups.com] On Behalf Of Dave Daniel
Sent: 30 January 2013 23:14
To: TekScopes@yahoogroups.com
Subject: Re: [TekScopes] Re: 485 No Trace - some progress, question

Where would one find a copy of the "Tek-Made Integrated Circuits Catalog"?

Cheers,
Dave


Anyone else out there feel like being probed?

Peter Davie
 

Hi Guys,

Quite a few of the probes I listed on Monday have sold to list members already (Thank you to all the buyers) but the following ones are still available:

I really need to shift these so why not make me an offer - you never know...

All these items are located in the UK and I'm happy to ship them worldwide.

I have original documentation for most of these items and will include it FOC where available.

1 x P6015A Probe in original cases with accessories
1 x P6015 Probe in original cases with accessories
1 x P6015 Probe with accessories (no case)
1 x P6013A Probe in original case with accessories
2 x P5100 Probes with Accessories (2 Large & 1 Small Hook Tips)
1 x P6009 Probes with Hook Tips
1 x P6028 Probe with Point Tip

1 x A6901 Ground Isolation Monitor

2 x CT-5 High Current Transformer Kit in original case with accessories
1 x CT-4 (No Case)

1 x P6016 Probe (May need attention)

1 x CT-1 Current Transformer with Accessories
2 x CT-2 Current Transformer with Accessories

3 x P6046 Differential Probe in original case with accessories

1 x P6201 FET Probe in original case with accessories

1 x P6156 Probe in original case (10X Tip only - no Tip Hook)

1 x 1101A Dual Probe Power Supply

Cheers,

Pete


Re: Some Tek stuff available- save it from the flea market! 7704, 7CT1N, etc

raymonddompfrank <r.domp.frank@...>
 

I have no idea what a fair price for this module would be. I would match any fair price, should Jerry reconsider - I'm afraid he won't though... better next time.

Buying this kind of equipment through Ebay from the Netherlands is even less attractive than in US because of (shipping) costs and limited willingness of sellers to ship to Europe.

Raymond

--- In TekScopes@yahoogroups.com, "Jamie" wrote:



That would be cool- we'll see if Jerry buys it or not. I should have posted "will trade for 5CT1N or 5L4N!" I have a bunch of 5k stuff- as an audio guy my 5k is fast enough for my uses (with a 454a when needed) and I have a 5D10 for anything I need to capture and really look at. Those two 5k plugs are not yet part of my collection!

I'm not in this to make a ton of money- I believe $150 is a fair price for a working 7CT1N as it's cheaper than any I've seen on ebay and I'm making money for a good cause. Maybe I should have put that in the sale thread- oops. These sales benefit the local ham club. I'm not a ham but a good friend is.

Hopefully Jerry will put it to good use!

Jamie

--- In TekScopes@yahoogroups.com, "raymonddompfrank" wrote:

Thanks, Jamie. Possibly, you could have sold the first ever 7CT1 to the Netherlands... ;)


Re: Some Tek stuff available- save it from the flea market! 7704, 7CT1N, etc

Jamie
 

That would be cool- we'll see if Jerry buys it or not. I should have posted "will trade for 5CT1N or 5L4N!" I have a bunch of 5k stuff- as an audio guy my 5k is fast enough for my uses (with a 454a when needed) and I have a 5D10 for anything I need to capture and really look at. Those two 5k plugs are not yet part of my collection!

I'm not in this to make a ton of money- I believe $150 is a fair price for a working 7CT1N as it's cheaper than any I've seen on ebay and I'm making money for a good cause. Maybe I should have put that in the sale thread- oops. These sales benefit the local ham club. I'm not a ham but a good friend is.

Hopefully Jerry will put it to good use!

Jamie

--- In TekScopes@yahoogroups.com, "raymonddompfrank" wrote:

Thanks, Jamie. Possibly, you could have sold the first ever 7CT1 to the Netherlands... ;)


Re: 485 No Trace - some progress, question

 

Mine came from aa4df.com - I think Dave H. is negotiating with his widow for his scans.

Regards,
David Partridge
________________________________

From: TekScopes@yahoogroups.com [mailto:TekScopes@yahoogroups.com] On Behalf Of Dave Daniel
Sent: 30 January 2013 23:14
To: TekScopes@yahoogroups.com
Subject: Re: [TekScopes] Re: 485 No Trace - some progress, question

Where would one find a copy of the "Tek-Made Integrated Circuits Catalog"?

Cheers,
Dave

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