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Re: Tek cam switch adjustment instructions?

Reginald Beardsley
 

These are grey cylindrical plastic cams with metal covers and are used for the vertical. Not sure about the horizontal as I've not opened it.. The switch contacts are leaf springs soldered or riveted to the PCB.


Re: Tek extenders

Colin Herbert
 

If he really has lots of 7000-series rigid extenders, I wouldn't getting one myself, even though I live in the UK and shipping is truly snail-like from the US at present. I realise that I'm at the back of the queue.
Colin.

-----Original Message-----
From: TekScopes@groups.io [mailto:TekScopes@groups.io] On Behalf Of Reginald Beardsley via groups.io
Sent: 07 May 2020 15:02
To: TekScopes@groups.io
Subject: [TekScopes] Tek extenders

FYI

The guy I bought the 577 from had a pile of extender cards about 16" long with 3 coax cables. He had been planning to scrap them for the gold. I urged him not to and said I'd find out what they were for.


Re: Anyone interested a addon plugin that enable you to use 7000 plugins on modern digital scope

 

On a second thought, I have another choice in merging the 7000 plugins with the capabilities of a digital scope.

I plan to keep my 547, 7704A and Ernesto101 scopes for the rest of my life, regardless of the expected advances in technology. The only case they now fall short is if I want to capture a waveform for further analysis or display, like to send pictures of them to my grandchildren (if they are interested in electronics) or if I need to write a paper for an electronics journal or give a class on the subject.

Now on a second thought, I would buy the OWON XDS2102A 100MHz 12 bits High Resolution ADC Digital Oscilloscope 12bit ADC decode XDS2102A scope, $399 + tax at Amazon. Twelve bits is already a decent vertical resolution that would not degrade the image quality of a CRT oscilloscope. And 100 MHz bandwidth is PLENTY for my modest uses. I have found out that the VERT SIG output of the 7704A has only 80 Mhz bandwidth anyway. I have no idea of the quality of "OWON" scopes, probably good enough for a retired hobbyist, and I have not bought it yet so I have time to inquire. (Maybe in 20 years I will be able to buy a fancy Tektronix digital on ebay for that same money, haha).

So with two lab oscilloscopes (the 547 and the 7704A) able to connect to an inexpensive digital scope I will have all the visual needs covered. No cameras, no storage CRTs, no digitizing plugins, etc.

Ernesto


Re: Tek extenders

Reginald Beardsley
 

I'm going to suggest that he take good photos that show the part number and auction them off on ebay. I saw at least 3 or 4 and he said he had a bunch more he'd been planning to recycle. I urged him not to do that.

When I told him my 577 died after 5 minutes and he apologized and offered to send me replacement parts. He'd have had no idea what to look for. I thanked him and explained it was expected buying old gear. That it was not a problem.

They're taking up a lot of space and he needs to move stuff, not sit on it. Especially if he's getting a bob truck load more. He had stuff stacked all over the living room, though not very efficiently. He's got a slew of Bird power sensors. I only saw a fraction of what he had. The top of a 4-5 ft pile in the garage the size of a small car.

I've repeatedly urged him to not scrap anything without talking to me first. He's dependent upon what things have sold for on ebay. If he can't find a prior sale he's a fish out of water. He knows that lots of the prices are simply nuts and that no one buys the stuff at those prices.

My hope is that this will prevent a bunch of scarce and hard to find stuff being sold for metal scrap. Which might well have happened to these had I not picked up the 577 myself and accepted an invitation to come look at other stuff.

He has a box marked "card extenders, proprietary" I did not look at those as they were all in bags.

Reg


Re: A z-axis interference modulation on a 7704A scope

Roger Evans
 

Ernesto, Albert,

I would have thought Ernesto has a slightly out of spec condition on his 7704A. It only takes a couple of Volts modulation on Vgk to make a noticeable difference to the CRT brightness. The grid and cathode supplies are derived from two separate voltage doublers so if one of these has too much ripple at 25kHz (loss of capacitance, leaky diode ...) it would account for what Ernesto sees. I don't think it is easy to get into the HV unit and test individual capacitors and diodes, and they also need to be tested at high voltage, not just a DMM. I also noticed in the manual that both grid and cathode supplies have their 'ground' end derived from the +150V unregulated supply, a substantial amount of ripple on +150V (also of course at 25kHz) could cause problems and is a lot easier to check out.

Regards,

Roger


TDS 5,6,7xx backpanel

Gerhard Hofbauer <gerhard.hofbauer@...>
 

Hi,

has anyone a TDS 5, 6, 7xx plastic backpanel for sale?

If yes, please contact me directly.

best regards,

Gerhard.


Re: Tek extenders

Colin Herbert
 

That is the serial # of the rigid extender and it is about 15" long, not including the two brackets at the front that retain the plug-in DUT. The flexible extender has the serial # 067-0616-00. The flexible extender does come in two flavours, however, one where it has plastic retainers to hold the plug-in DUT, and one where these are absent. I think I recall that the plastic retainers were a modification and there might be some mention of this on TekWiki.
Colin.

-----Original Message-----
From: TekScopes@groups.io [mailto:TekScopes@groups.io] On Behalf Of Reginald Beardsley via groups.io
Sent: 08 May 2020 16:15
To: TekScopes@groups.io
Subject: Re: [TekScopes] Tek extenders

These looked very similar to an ebay photo of a TEKTRONIX 067-0589-00.

More info as soon as I have it.

Reg


Re: Tek extenders

Reginald Beardsley
 

These looked very similar to an ebay photo of a TEKTRONIX 067-0589-00.

More info as soon as I have it.

Reg


Re: Tek extenders

Colin Herbert
 

The Tek flexible extenders that I have use six co-axial cables, three each side (as do the rigid extenders, but the six coaxial cables have connectors at about the middle of the extender) . The total flexible cable length is about 36 inches. It sounds like these are either home-made or they fit something completely different.
Colin.

-----Original Message-----
From: TekScopes@groups.io [mailto:TekScopes@groups.io] On Behalf Of Reginald Beardsley via groups.io
Sent: 07 May 2020 15:02
To: TekScopes@groups.io
Subject: [TekScopes] Tek extenders

FYI

The guy I bought the 577 from had a pile of extender cards about 16" long with 3 coax cables. He had been planning to scrap them for the gold. I urged him not to and said I'd find out what they were for.


Re: Anyone interested a addon plugin that enable you to use 7000 plugins on modern digital scope

Michael W. Lynch
 

Yang,

This is a very interesting project. I hope you can work out the minor details. Thank you for your efforts.

--
Michael Lynch
Dardanelle, Arkansas


Re: Tek cam switch adjustment instructions?

Colin Herbert
 

Question: Are you referring to the vertical or the horizontal range switches? I am not personally familiar with these 500-series scopes, but I do have experience of the 7000-series, which look similar in some ways as they both use plug-ins, by the look of it.
Colin.

-----Original Message-----
From: TekScopes@groups.io [mailto:TekScopes@groups.io] On Behalf Of Reginald Beardsley via groups.io
Sent: 08 May 2020 14:46
To: TekScopes@groups.io
Subject: [TekScopes] Tek cam switch adjustment instructions?

I have a 5103/D10 with problems with the range switches. I'd like to find instructions on how these should be adjusted. My attempt so far has had mixed success. I'd fix some range steps and others would stop working.

Thanks,
Reg


Re: Tek extenders

Michael W. Lynch
 

If these are indeed 7xxx series extenders and if there are any left, I would like to have a chance to get one/ one.

--
Michael Lynch
Dardanelle, Arkansas


Re: Tek extenders

Glenn Little
 

I am interested in one.
Do they have any numbers on them?

Glenn

On 5/7/2020 10:01 AM, Reginald Beardsley via groups.io wrote:
FYI

The guy I bought the 577 from had a pile of extender cards about 16" long with 3 coax cables. He had been planning to scrap them for the gold. I urged him not to and said I'd find out what they were for.

--
-----------------------------------------------------------------------
Glenn Little ARRL Technical Specialist QCWA LM 28417
Amateur Callsign: WB4UIV wb4uiv@arrl.net AMSAT LM 2178
QTH: Goose Creek, SC USA (EM92xx) USSVI LM NRA LM SBE ARRL TAPR
"It is not the class of license that the Amateur holds but the class
of the Amateur that holds the license"


Tek cam switch adjustment instructions?

Reginald Beardsley
 

I have a 5103/D10 with problems with the range switches. I'd like to find instructions on how these should be adjusted. My attempt so far has had mixed success. I'd fix some range steps and others would stop working.

Thanks,
Reg


Re: Anyone interested a addon plugin that enable you to use 7000 plugins on modern digital scope

 

On Fri, May 8, 2020 at 07:18 AM, Ernesto wrote:


I like the aesthetics of my 7704A as it stands today, I hate to see it
extended with some box sandwiched between its two halves.
The P7001-equipped 7704A does indeed stand out (pun intended) and looks strange in the beginning but it grows on you, especially in the vicinity of standard-height 7000's.
Of course, speed and intelligence are very limited but nice things are possible when connecting it to an external computer. Mine has the GP-IB interface.

Raymond


Re: Anyone interested a addon plugin that enable you to use 7000 plugins on modern digital scope

 

On Fri, May 8, 2020 at 08:24 AM, Yang Cui wrote:


Over the time, I find it is just so much pain and effort to maintain these old
scopes, so that I can get good noise performance. That is partially why I
started this project.
Using the acquisition part of a 7704A, as I mentioned in an earlier message, of course is out of the question as a general solution. That's why I like your idea and project.
I have a few Tek-7000 backplanes with their connectors in good condition and others (in the group) may as well, so in case you'd consider allowing for the original backplane connectors as an option on your PCB layout, I'd be all for it... I've unsoldered a number of them, not a big deal - with the right equipment.

Did I mention I'm interested in purchasing a few of your "add-on boards"? Put me on your list for two single units and one double...

Raymond


Re: Tek extenders

 

Definitely interested !!

On Thursday, May 7, 2020, 10:20:32 AM EDT, Reginald Beardsley via groups.io <pulaskite=yahoo.com@groups.io> wrote:

FYI

The guy I bought the 577 from had a pile of extender cards about 16" long with 3 coax cables.    He had been planning to scrap them for the gold.  I urged him not to and said I'd find out what they were for.


Re: Anyone interested a addon plugin that enable you to use 7000 plugins on modern digital scope

ycui7
 

Hi Ernesto,

I have multiple 7000 series scopes. My 7613, 7633 scopes have a 10-20 mV low frequency noise on the vert signal output, I could not figure out why and give up on the idea sending vertical output to digital scope for recording. The 10-20 mV low frequency noise kills the noise floor of my measurement.

My 7834 does not have that problem, but it dead a week ago. So, now I have no way to send my 7000 series plugins collection's signal to digital scope anymore. Over the time, I find it is just so much pain and effort to maintain these old scopes, so that I can get good noise performance. That is partially why I started this project.


Re: Anyone interested a addon plugin that enable you to use 7000 plugins on modern digital scope

 

Raymond,

The 7704A is really an interesting instrument where the two halves are interconnected by a single edge connector with a couple of coax connectors attached. I also played with the idea of running it with the two halves separated, but I don't think the length of the connector will allow for much separation. I speculated with the idea of doing it if I ever have to debug the main board connecting to the plugins and the small vertical and horizontal interface boards.

The P7001 is an intelligent ad-on, well suited for the era of the beginning 70s, when digitizing was done before the advent of fast flash converters. Today, with 12-bit converters running at tens of giga-samples/sec, that technology is a little old.

I like the aesthetics of my 7704A as it stands today, I hate to see it extended with some box sandwiched between its two halves. And it works so well now! The vertical out and sweep gate outputs preserve most of the internal bandwidth. So what better way to digitize the signals than send them to a small inexpensive digital scope?

If I had the need to digitize the output of a spectrum analyzer like the 7L13, I would buy the little Siglent Technologies SDS1202X-E 200 mhz Digital Oscilloscope that Amazon is trying so hard to sell me for $359 plus tax. I place it besides the bigger 7704A, and interconnect the two with two coax cables. This digital scope has a 200 Mhz bandwidth, a huge overkill for the logic analizer output, but well matched with the 200 Mhz of the 7704A. So with a slow sweep and 1 Ghz samples, it can get good x-axis resolution. The vertical resolution of 8 bits is a little cheap though. (but I don't know the equivalent digital resolution of the 7704 CRT screen).

I think that old and new technologies can coexist very nicely.

Ernesto


Re: Anyone interested a addon plugin that enable you to use 7000 plugins on modern digital scope

ycui7
 

Thanks All for the response.

The current status is:

1. The DC DC converter can only put out 10W at the moment and the controller chip overheat, the requirement is 16.5W. This partly due to the limitation of off-the-shelf transformer.
2. TI's official footprint for the differential to single-ended conversion amplifier is wrong, the part cannot be soldered, thus bandwidth testing has to wait.

A new revision is being made and waiting for delivery. The new revision uses bigger magnetics and discrete low Rdson transistors to reduce heat generation.

The DC DC conversion is isolated push-pull topology running at 1 MHz. I do not know what the noise performance will be, but they are marketed as low noise topology in linear tech's datasheet.

The bandwidth is not a major concern. TI has quite a portfolio of very high speed opamps. They perform pretty well in the past for me.

For dual slots plugins, my plan is to take two boards and you connect the output to you digital scope by X-Y mode.

If the project can get good traction, I can make a dual slot version to better serve the community. The dual slot version will be a single pcb with an even bigger DC DC converter (33W). Considering the dual slot audience is low speed output signal for both sampling and spectrum analyzer plugins, I could even include ADC and PC data acquisition, such that the addon board will be fully standalone. Of course, once I put fpga and adc on the board, it make sense to get the readout included. But that would be quite down the road. (I do have a existing board design that capable to readout >16bit signal at 2MS/s with working FPGA firmware).

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