Date   

Re: Service Maual for TM502 frame

Mark Wendt <mark.wendt@...>
 

Dennis,

Thanks for that. I just assumed it was the fans... ;-)

Mark

On 01/30/2013 12:57 PM, Dennis Tillman wrote:
Mark,

Your plugins run cooler because the TM5006 and TM5003 regulate the DC supply voltages unlike the TM5xx mainframes. As a result the TM5xx would be providing 11.5VDC when lightly loaded and at least 7.6VDC under full load. The TM5006 will be providing a much more tightly regulated 8VDC nominal (8.5VDC and 7.6VDC are the limits) to your plugin regardless of the mainframe load.

The same is true of the +/-33.5VDC supplies in the TM500 mainframes. They are regulated to a nominal +/-26VDC in the TM5000 mainframes.

This is good and bad. Some of the older plugins were designed with the expectation of a higher voltage (11.5VDC) being available on the TM500 mainframes and they just barely operate on the 8.5VDC of the TM5000 mainframes. Ditto for the +/-33.5VDC supplies.

Dennis

-----Original Message-----
From: Mark Wendt, Sent: Wednesday, January 30, 2013 2:21 AM

On 01/29/2013 05:51 PM, Dennis Tillman wrote:

As you probably discovered by now, there was no TM502. There was only
a TM502A.

All of the TM5xx mainframes are virtually identical in the most
important respect how power is provided to the plugins. They all use
a classic transformer power supply. So if you have schematics for one
TM5xx power supply almost everything will be similar in you TM502
except for the location of the parts and some parts values.

The TM5003 and TM5006 used switching power supplies to save weight so
they are significantly different! .
And the TM5006 keeps my plugins running cooler! ;-)

Mark



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

Yahoo! Groups Links




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

raymonddompfrank <r.domp.frank@...>
 

Hi Jamie,
I was a bit disappointed 'cause these things are so hard to find, even more so in Europe.
Of course, it's your 7CT1N and your decision. I would not start a fight about this on "our" forum --- I'd take it outside... Joking!

Jerry has already kindly offered me to purchase it from him once he's done with his adapter development, so there's a good chance that we'll be happy after all.

Raymond

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



It sounds as though Jerry doesn't need it long-term. Perhaps you can arrange to buy it from him when his need passes.

Perhaps I should have allowed for bidding. If you work it out with Jerry I'll sell it to you- but I don't want to start a fight.

jamie

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

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: P6015 Freon 114 is ready to go :)

Craig Sawyers <c.sawyers@...>
 

Fly to Florida, put it in checked luggage, and hope it gets through without
anyone asking questions. Seems to me like the only way.

Craig


Re: P6015 Freon 114 is ready to go :)

 

Now if you could figure out some way to ship some to the UK?

Regards,
David Partridge


7603 power supply woes

rekrullunreenigne
 

Hello all.
I'm new here, so forgive me if I tread upon some ancient tradition by mistake.
Anyways.

I managed to pick up a sweet bundle on a pair of 7000 series mainframes *with* plugins, the catch of which was one was broken.
I was told it would be the big 7904 - but it turned out to by the smaller 7603.

I checked both over before hand, there were no obviously damaged parts, they're in reasonable shape, nice and clean inside.
The 7904 happily flickered on just fine, and I was pleased to find all seven plugin modules worked reasonably well.

The 7603 b358xxx powered up for about five minutes, before quietly blinking off. No dramatics about it, not even a whiff of something wrong.

My slightly naive poking around shows that all the low voltage rails are about 15% out of spec, ie 130V reads 113V, 15V is 12V, and so on.
So I looked in the service manual I was fortunate to receive with it, and decided to poke at the 130V rail first, since everything else seems to rely on it in some degree.

Past experience, and reading around both suggested capacitor problems were likely. I decided I'd use my working 7904 to see what was up with the 130V rail, and found a choppy AC waveform, instead of nice flat DC like the other rails. Pretty sure that's not right.

So I replaced the capacitor. Hold my breath, quick test - but the 7603 not only fails to power on, as the voltage sag is still present, but the AC waveform was still visible at the capacitor.

Finding this weird and confusing, I decided to try changing the rectifier - would you believe I had an exact replacement by happy coincidence? But that's done nothing either. I tried another with similar ratings as well, also to no avail.

This is where I've become stuck. I'm not entirely certain what to do next, for fear of making the problem any worse. I was thinking I might try unplugging various other control boards, to try and see if something in particular is dragging it all down, but I'm a touch inexperienced at this, and being largely self-guided, am prone to err.

If you've read this far, you're a champ :) Hopefully my wall of text isn't too scary.


P6015 Freon 114 is ready to go :)

Sergey Kubushyn
 

Hi everybody,

I finally have that Freon 114 for Tektronix P6015 probes ready to go. I
uploaded 2 photos in Freon114 album so everybody can look at the original
30lb jug and the bottle I'll be shipping it in.

It is actually very easy to work on. It feels much like diethyl ether just
colder. Similar chloroform-like smell, similar cold feeling, no frostbyte...
Very easy to fill those bottles -- attach a stock refrigerant hose to the
jug, put jug upside down, open the valve one full turn and it flows like
water from a faucet... Starts boiling on contact with the room temperature
bottle but almost immediately cools down and boiling stops. Pressure in the
bottle at room temperature is not high so it is safe. It is quite dense, way
heavier than water and vapor is very heavy -- it flows like water.

Should be very easy to use -- just put it into a household freezer for an
hour or so before opening and it pours like water, nothing special.

So everybody who needs it can get it right now. As I already told it is $25
for 100ml plus $3 for the bottle. I don't want to bother with pennies on
shipping charges, PayPal fees etc, so let's make it $7 flat for shipping
within continental US and everything else. That makes it $35 shipped.

Those bottles are actually not all that bad and they have a plug in addition
to that tamper-proof cap. Bottles are 125ml filled with 100ml of freon.
Everybody who worked with refrigerants knows that all the cylinders must be
filled for not more than 80% of their actual volume to give room for vapor
pressure. It might be not that important for high boiling R-114 but anyways
better be safe than sorry...

I can also fill your bottles if you want so, just ship them to me. It
doesn't make much sense because you'll spend more on shipping than my
bottles cost but anyways...

Payment is via PayPal to ksi-at-koi8-dot-net. I have 25 those bottles on
hand. If there is more takers I'll have to order another 25. This takes a
week -- they are shipped from Florida UPS ground and it takes time to
deliver them to Las Vegas...

I will be packing them on weekends and they will be picked up on Mondays.
Everybody who paid before Sunday will have their box shipped on Monday.
Those who paid later will have their boxes packed next Sunday and shipped
out the following Monday.

As a side note -- one never knows what treasure he might find on garage sale
that he happened to drive by :) It was not actually a full 30lb jug, just
30lb gross weight but it is still 24lb+ of Freon 114 left in that jug that
should be enough for everyone for a long while...

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


Re: 485 No Trace - some progress, question

 

I suppose that is good news since U1560 would probably be difficult to
replace. On the other hand, that just moves the problem into the
inscrutable oscilloscope logic.

I would take a close look at the horizontal and vertical mode switches
because they are subject to mechanical failure and those pullup
resistors. Those are easy to check.

Sometimes a pushbutton switch can conduct a static discharge into the
circuits and damage them so I would check any logic ICs directly
connected to them like U1530, U1535, and U1580.

On Thu, 31 Jan 2013 05:39:01 -0000, "Robert"
<go_boating_fast@yahoo.com> wrote:

Quick test: I tried IC U1560 in the working scope and got a trace, so it looks like some input is keeping it in blanking mode. On to more circuit analysis and tracing.

Bob


Re: 485 No Trace - some progress, question

Robert Simpson
 

Quick test: I tried IC U1560 in the working scope and got a trace, so it looks like some input is keeping it in blanking mode. On to more circuit analysis and tracing.
Bob

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

The Tek-Made Integrated Circuits Catalog has details and an internal
schematic for the 155-0012-00 Z-Axis Logic IC.

Pins 5 and 15 are high impedance logic inputs so the slightly higher
voltages you measured should not damage a replacement IC but before
trying a swap, I would check the circuits that generate the voltages
going into pins 5 and 15 although I am not sure what I would look for.
There is no reason for those pins to be high.

I would also check the area around U1585.

I do not see any evidence that U1560 is bad. I suspect an earlier
problem is keeping the CRT beam blanked.

On Wed, 30 Jan 2013 19:37:58 -0000, "Robert"
wrote:

Yes,
With further review of the schematic, I realized I was going into the focus control. Looking back, I see pin 8 of U1560 affects the Z out test point. Testing Pin 8 on the working scope varies about one volt. Pin 8 on the non working scope doesn't vary at all. I re-socketed this IC and the surrounding transistors. No effect.
Measurements for U1560:

U1560
Pin Working Non Working
1 -62mv +26mv
2 +1.1V +1.1V
3 +0.7V +0.3V
4 +51mv +48mv
5 +4.9mv +1.06V
6 +0.78V +0.79V
7 +0.96V +1.0V
8 +13.9V +14V
9 +3.6mv -1.0mv
10 +4.25V +4.2V
11 +14.9V +15V
12 +5.0V +4.9V
13 +4.9V +4.9V
14 +98mv +99mv
15 -187mv +928mv
16 -138mv +282mv

Question, given the above measurements, would it be safe to swap in the working U1550 without risk of damage?

Bob


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

I do not envy you trying to work through that z-axis amplifier. Having
a working 485 for comparison will help a lot.

R1703 is part of the focus circuit path. Z In (TP1741) and Z Out
(TP1781) are the input and output of the z-axis amplifier.

If the z-axis amplifier transistors are socketted, I would pull and
check them individually for shorts and opens using the diode test
function on my multimeter.

On Wed, 30 Jan 2013 16:27:26 -0000, "Robert"
wrote:

Last night tried the Grid Bias adjustment procedure item 10 on page 5-10 and found a problem. The non working scope has no change at the Z Out DC test point when adjusting the A channel intensity. My working 485 changes as expected when adjusting the front panel A channel intensity control. The non working scope stays the same at about 8.2 volts. 8.2 volts is about the same as the working scope with the front panel A channel intensity all the way down. So the beam must be in cutoff condition.

So far have traced to R1703 and the voltage varies OK to that point (same as the working 485). I will continue tracing today.
Bob


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

madrivereric
 

In the (unlikely) chance that Jerry and Raymond end up falling through on the purchase, I'm also interested in the 7CT1N since I don't have a curve tracer yet...

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



It sounds as though Jerry doesn't need it long-term. Perhaps you can arrange to buy it from him when his need passes.

Perhaps I should have allowed for bidding. If you work it out with Jerry I'll sell it to you- but I don't want to start a fight.

jamie

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

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

Jamie
 

It sounds as though Jerry doesn't need it long-term. Perhaps you can arrange to buy it from him when his need passes.

Perhaps I should have allowed for bidding. If you work it out with Jerry I'll sell it to you- but I don't want to start a fight.

jamie

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

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: 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

95241 - 95260 of 182077