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Re: WTD: 7704A Power Supply
Don Black
Hi,
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I recently bought a 7504A mainframe with a note saying that it's electrically perfect but has some loose contacts on the contact strips for the plugin modules. I haven't had time to do anything more than plug it in and see that it does have a trace (the only plugin I have is a 7A12 I already had that seems to work on one channel. I'll have to find some vertical and sweep plugins for it. Does anyone have a schematic for a 7A12 they could scan and email to me please). I do have the mainframe manual. I haven't looked inside but the connector problem sounds like the 7704A's. does mine use the same type of connector and is it just a typical edge connector or a "special"? Thanks, Don Black. donlcramer@... wrote: My 2 cents: |
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Re: WTB: Tektronix 7D01 w/DF1(or DF2)
JOSE V. GAVILA (EB5AGV/EC5AAU)
Hi Craig and the group,
These come up fairly often on eBay. Seem to go in the range $10 to $60 forYes, I know... but I prefer a seller who can check it and says something different to 'as-is' or 'not checked' or 'I don't know how it works but guaranteed not DOA' ;-) Regards, JOSE ---------------------------------------------------------------------- 73 EB5AGV / EC5AAU - JOSE V. GAVILA La Canyada - Valencia (SPAIN) EB5AGV Vintage Radio Site: European Boatanchors List: |
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Re: WTB: Tektronix 7D01 w/DF1(or DF2)
Craig Sawyers
Title says it all ;-). I want just the plug-ins (no probesThese come up fairly often on eBay. Seem to go in the range $10 to $60 for the whole lot. There are three sets for sale right now on US Ebay. Craig |
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WTB: Tektronix 7D01 w/DF1(or DF2)
JOSE V. GAVILA (EB5AGV/EC5AAU)
Good morning!
Title says it all ;-). I want just the plug-ins (no probes needed). Please, state condition (physical and operating) and price. A service and / or user's manual would be a plus. Thanks! JOSE ---------------------------------------------------------------------- 73 EB5AGV / EC5AAU - JOSE V. GAVILA La Canyada - Valencia (SPAIN) EB5AGV Vintage Radio Site: European Boatanchors List: |
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Re: WTD: 7704A Power Supply
Lynn Lewis
Don, that sounds like some very good advice. I'll look for replacements for
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awhile before I disassemble it. By the way, guys, I'm going to sell it either way, whole or in parts, so if someone has the slot covers and needs a scope to use them on, give me a ring. -----Original Message-----
From: donlcramer@... [mailto:donlcramer@...] Sent: Friday, January 18, 2002 1:43 AM To: TekScopes@... Subject: Re: [TekScopes] WTD: 7704A Power Supply My 2 cents: Sounds like you're so close now to having it fixed, I would think you'd want to take the last steps. You've narrowed it down to cracked or missing backplane connector shells. This is definitely why slot one is dead, and my guess is you also have one shell fractured in slot 3. My recollection is that these contact tensioning covers are nylon, snap fit into place, and become yellow and brittle over time. I would try to get replacements from anyone currently selling Tek parts: Sphere Research, Surplus Sales, Deane Kidd, plus the couple guys who keep showing up on ebay with new Tek parts. I can't recollect the names off hand--one is local here in Aloha OR I think and the other is in Canada. When the latter puts parts up on ebay, he puts up a couple dozen at a time so you can't miss him. I find them with my daily search for "Tektronix new". Only if that didn't pan out, would I scrap the mainframe (unless there is more wrong than I know). I remember I had a 7704A while at Tek many moons ago and the readout shimmied a bit on that also (and it was near new at the time). I wonder if that isn't a normal trait. I also remember having to replace those nylon shells a few times back then. Good luck either way, Don Yahoo! Groups Sponsor ADVERTISEMENT To unsubscribe from this group, send an email to: TekScopes-unsubscribe@... Your use of Yahoo! Groups is subject to the Yahoo! Terms of Service. |
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Re: Info: 564B found FS in Wollongong, Australia
Craig Sawyers
sale in the "Cash-Mart" second-hand shop in Wollongong a coupleEr - OK, Wollongong is in Australia, right? So $165 is Aussie dollars? That would make it around $80US or around ?60UK. At that price, I'd snap it up. If I wasn't on the other side of the planet, that is :-) Craig |
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Re: WTD: 7704A Power Supply
Craig Sawyers
I remember I had a 7704A while at Tek many moons ago and theFunny you should mention that. It is a long time since I used a 4-bay Tek scope, but I recall that the readout vibrated up and down a little too (it was either a 7704 or a 7904 - I forget which now). I think that was what surprised me with the 7603 I recently bought - the readout is rock solid. Craig |
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Info: 564B found FS in Wollongong, Australia
Michael
To whom it may concern ,and for what it's worth, I found a 564B scope for
sale in the "Cash-Mart" second-hand shop in Wollongong a couple of days ago. They were asking $165 for it. I don't remember what plugins were in it, but I established that it powered up and displayed a trace or two, and the timebase and vertical amps seemed to be working. I didn't have the asking price, or I might have bought it myself. It's relatively undamaged but a bit grubby - should clean up okay. Might be of interest to someone. Email me if you need more info. (BTW, I have NO connection with the store concerned...) Regards, Michael |
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Re: WTD: 7704A Power Supply
"....It is a long time since I used a 4-bay Tek scope, but I recall that the
readout vibrated up and down a little too (it was either a 7704 or a 7904 - I forget which now)...." Craig --------------- It seems the on screen readout, while a brilliant feature, is never quite perfect. For instance, the character focus and/or astig never seems to be quite sharp, and it varies depending on screen location in some models. Part of the wonderful character of the scopes I suppose. Don |
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Re: WTD: 7704A Power Supply
Lynn Lewis
Okay, guys. Here's the deal. I have the 7704A working but I need some
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advice. Slot 1 is unusable and slot 3 is unreliable. All the switches and controls have been cleaned and work smoothly. All the panel lights work. Go here to see the scope: Is there a way to repair the slots? I can either try to repair them or else I can break the scope down into parts and sell the parts. Dick already wants a power supply. Does anyone else need any boards? Except for the slots, you can see that the scope works. The readouts have a slight ripple so there's probably a weak filter cap somewhere but it's not bad and it doesn't show up on the trace. I would be happier with a more focused trace but it's not as bad as it appears in the photos. Fix it? Or, break it down? What do you think? -----Original Message-----
From: w1ksz [mailto:w1ksz@...] Sent: Wednesday, January 16, 2002 5:23 PM To: TekScopes@... Subject: [TekScopes] WTD: 7704A Power Supply I have a very clean 7704A with a sick Power Supply. Anyone have one they will part with ? Thanks, Dick, W1KSZ Yahoo! Groups Sponsor ADVERTISEMENT To unsubscribe from this group, send an email to: TekScopes-unsubscribe@... Your use of Yahoo! Groups is subject to the Yahoo! Terms of Service. |
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Re: WTD: 7704A Power Supply
My 2 cents:
Sounds like you're so close now to having it fixed, I would think you'd want to take the last steps. You've narrowed it down to cracked or missing backplane connector shells. This is definitely why slot one is dead, and my guess is you also have one shell fractured in slot 3. My recollection is that these contact tensioning covers are nylon, snap fit into place, and become yellow and brittle over time. I would try to get replacements from anyone currently selling Tek parts: Sphere Research, Surplus Sales, Deane Kidd, plus the couple guys who keep showing up on ebay with new Tek parts. I can't recollect the names off hand--one is local here in Aloha OR I think and the other is in Canada. When the latter puts parts up on ebay, he puts up a couple dozen at a time so you can't miss him. I find them with my daily search for "Tektronix new". Only if that didn't pan out, would I scrap the mainframe (unless there is more wrong than I know). I remember I had a 7704A while at Tek many moons ago and the readout shimmied a bit on that also (and it was near new at the time). I wonder if that isn't a normal trait. I also remember having to replace those nylon shells a few times back then. Good luck either way, Don |
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Re: Using a 7A16P in a 7904 mainframe
Lynn Lewis
If it works and If the shipping is low and If you can trust the seller, --
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it's a good price. -----Original Message-----
From: JOSE V. GAVILA (EB5AGV/EC5AAU) [mailto:eb5agv@...] Sent: Thursday, January 17, 2002 1:52 AM To: TekScopes@... Subject: [TekScopes] Using a 7A16P in a 7904 mainframe Hello! I wonder if the above mentioned combination will work fine. I have been offered a curious (to me at least!) setup: 7904 + 7A16P + 7B92. It has some trouble with signals over 100MHz (it seems a timebase trouble, as with another 7B92, it works fine, seller says). Price is $100. What do you think? Regards, JOSE ---------------------------------------------------------------------- 73 EB5AGV / EC5AAU - JOSE V. GAVILA La Canyada - Valencia (SPAIN) EB5AGV Vintage Radio Site: European Boatanchors List: Yahoo! Groups Sponsor ADVERTISEMENT To unsubscribe from this group, send an email to: TekScopes-unsubscribe@... Your use of Yahoo! Groups is subject to the Yahoo! Terms of Service. |
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Using a 7A16P in a 7904 mainframe
JOSE V. GAVILA (EB5AGV/EC5AAU)
Hello!
I wonder if the above mentioned combination will work fine. I have been offered a curious (to me at least!) setup: 7904 + 7A16P + 7B92. It has some trouble with signals over 100MHz (it seems a timebase trouble, as with another 7B92, it works fine, seller says). Price is $100. What do you think? Regards, JOSE ---------------------------------------------------------------------- 73 EB5AGV / EC5AAU - JOSE V. GAVILA La Canyada - Valencia (SPAIN) EB5AGV Vintage Radio Site: European Boatanchors List: |
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Re: Digitizer on eBay
Lynn Lewis
Stan
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I forget to look for a part number. What you said sounds right to me. I like the idea of a coaxial relay. Are they used in anything else? I'll probably be asking about pinouts later. Thanks. Dick, I solved my power supply problem, except it wasn't actually the power supply. One of the cables going to the calibration board was plugged in backward (P10D, I think). They symptoms were, nothing worked except the little bulb in the power supply (??19). You could here it going tik, tik, tik but the graticule lights didn't even come on. I got pretty intimate with the schematic but I'm afraid you didn't give me much to go on. By the way, with mine, the 5 volt supply was also less than a volt. More to come. -----Original Message-----
From: Stan or Patricia Griffiths [mailto:w7ni@...] Sent: Thursday, January 17, 2002 12:46 AM To: TekScopes@... Subject: Re: [TekScopes] Digitizer on eBay Hi Lynn, After taking a look at the eBay pictures, I have to admit that in my 26+ years at Tek, I have never seen this thing. Tek made a lot of LARGE systems of 7912's (digitizers, like we have been discussing here) for the military. I think many of those systems have been broken down into pieces for sale on the surplus market. This looks like one of the pieces of such a system for routing standard signals to the individual 7912's (or maybe 7612's) to verify system performance prior to using the system to gather data during a test. No doubt, there are many coaxial relays inside the box and the two blue connectors are used to control the opening and closing of those relays for routing signals. Most of these types of equipment never appeared in any catalog since they were custom-made in very low quantities. Stan w7ni@... Lynn Lewis wrote: > I've decided to pass on the digitizer. I've bought enough "toys" already > (toy=something to take apart to see if there is anything useful in it), > including an HP1630D. Right now, I have a 7704A scattered across my > workbench. > > I've always worried about those EMPs. I've though about adding ferrous > shielding around my hard drive in case a nuke hit close by <:-) > > Here is the link to the Auto-Cal Steering Unit on ebay: > > 720 > I'll check for a part number when I get back to the office later today. > > It's made by Tektronix. It's rack mounted but no hinged door. It has a > multitude of BNC connectors. Inside (besides lots of room, which I find > unusual for Tektronix) there is a horizontal metal partition between the top > section and the bottom section to which the circuit boards are attached, > also horizontally. On the bottom of the partition is a (well made, easy to > get to) power supply that provides +5, +15, -15, and -5.2vdc. The other > boards are on top of the partition. Most of the cables from the BNC > connectors go to a board with a bunch of flat "relays". Each relay has one > input and (I forget) maybe 4 outputs. It's purpose is obviously to "steer" > a signal from one input to one of several outputs, depending on instructions > sent by the other (logic?) boards. The logic boards apparently attached to > something via the centronics like connectors and that something determined > the "route" of the signal. I'm thinking that it may have routed several > calibration devices to an output so that once hooked up, you could change > inputs automatically without having to unplug and replug cables all the > time. In any case, it's a very nice box but I'm going to explore it a while > before I decide whether to gut it or not. > > Lynn Yahoo! Groups Sponsor ADVERTISEMENT To unsubscribe from this group, send an email to: TekScopes-unsubscribe@... Your use of Yahoo! Groups is subject to the Yahoo! Terms of Service. |
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Re: Digitizer on eBay
Stan or Patricia Griffiths
Hi Lynn,
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After taking a look at the eBay pictures, I have to admit that in my 26+ years at Tek, I have never seen this thing. Tek made a lot of LARGE systems of 7912's (digitizers, like we have been discussing here) for the military. I think many of those systems have been broken down into pieces for sale on the surplus market. This looks like one of the pieces of such a system for routing standard signals to the individual 7912's (or maybe 7612's) to verify system performance prior to using the system to gather data during a test. No doubt, there are many coaxial relays inside the box and the two blue connectors are used to control the opening and closing of those relays for routing signals. Most of these types of equipment never appeared in any catalog since they were custom-made in very low quantities. Stan w7ni@... Lynn Lewis wrote: I've decided to pass on the digitizer. I've bought enough "toys" already |
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Re: WTD: 7704A Power Supply
Lynn Lewis
I'm going to be doing some 7704A power supply troubleshooting this evening
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myself. If you'll tell me everything you know about your problem, I'll keep it in mind while I'm working (or while its fresh on my mind, anyway). Maybe we'll get lucky. -----Original Message-----
From: w1ksz [mailto:w1ksz@...] Sent: Wednesday, January 16, 2002 5:23 PM To: TekScopes@... Subject: [TekScopes] WTD: 7704A Power Supply I have a very clean 7704A with a sick Power Supply. Anyone have one they will part with ? Thanks, Dick, W1KSZ Yahoo! Groups Sponsor ADVERTISEMENT To unsubscribe from this group, send an email to: TekScopes-unsubscribe@... Your use of Yahoo! Groups is subject to the Yahoo! Terms of Service. |
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cables
Lynn Lewis
I learned to use an oscilloscope in Tech School at Lowry AFB in 1966. The
next time I used one was last December - over 35 years later. You forget a lot in 35 years. I have scopes. I have probes. I have a frequency counter and I have a function generator. I have 52 ohm coax and I can crimp BNC connectors. Anyway, to the point. On a 7904: when I ran a short cable from a T on "VERT input" to "TRIGGER in" while looking at the 1KHz square wave, the square wave wasn't square anymore. It occurs to me that I need to make myself some auxiliary cables (BNC to BNC, BNC to alligator, etc.) to connection various things in the most useful way. I would welcome suggestions for designing and building a variety of such cables. What do you guys use??? |
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Tek DC 510 module fault
petes7457
Hi,
I recently purchased a DC 510 module which works fine except for an occassional tendancy to go haywire displaying random garbage and only intermittently displaying the correct value. When the unit exhibits this fault the self test routine returns error (?) numbers 330, 331, 332 or 333. I'm only driving channel A at present. Does anyone have access to a manual or suggest where to start looking to localise and correct this fault? Kind regards, Pete |
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Re: Digitizer on eBay
Lynn Lewis
I've decided to pass on the digitizer. I've bought enough "toys" already
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(toy=something to take apart to see if there is anything useful in it), including an HP1630D. Right now, I have a 7704A scattered across my workbench. I've always worried about those EMPs. I've though about adding ferrous shielding around my hard drive in case a nuke hit close by <:-) Here is the link to the Auto-Cal Steering Unit on ebay: 720 I'll check for a part number when I get back to the office later today. It's made by Tektronix. It's rack mounted but no hinged door. It has a multitude of BNC connectors. Inside (besides lots of room, which I find unusual for Tektronix) there is a horizontal metal partition between the top section and the bottom section to which the circuit boards are attached, also horizontally. On the bottom of the partition is a (well made, easy to get to) power supply that provides +5, +15, -15, and -5.2vdc. The other boards are on top of the partition. Most of the cables from the BNC connectors go to a board with a bunch of flat "relays". Each relay has one input and (I forget) maybe 4 outputs. It's purpose is obviously to "steer" a signal from one input to one of several outputs, depending on instructions sent by the other (logic?) boards. The logic boards apparently attached to something via the centronics like connectors and that something determined the "route" of the signal. I'm thinking that it may have routed several calibration devices to an output so that once hooked up, you could change inputs automatically without having to unplug and replug cables all the time. In any case, it's a very nice box but I'm going to explore it a while before I decide whether to gut it or not. Lynn -----Original Message-----
From: Stan or Patricia Griffiths [mailto:w7ni@...] Sent: Wednesday, January 16, 2002 12:43 AM To: TekScopes@... Subject: Re: [TekScopes] Digitizer on eBay Lynn, If you are talking about the 7912, it is good for making extemely fast, single-shot measurements. Very handy for things like nuclear explosions . . . when you need to catch the EMP on your screen. Is this "Auto-Cal Steering Unit" a Tektronix item? Does it have anything like a Tek part number on it? Is it a rackmounted item with a hinged door on the front? Stan w7ni@... Lynn Lewis wrote: > I guess that conversation took place before I joined. Could someone tell > me - briefly - what the digitizer is good for? And what else would one need > to go with it to make it useful? > > P.S. I recently bought a box called an Auto-Cal Steering Unit. I actually > bought it for the box ($5 + S&H) > but now that I've looked inside, I find it intriguing. I'm especially > curious as to what connects to the two > centronics-like connectors on the back. Any background would be > appreciated. > -----Original Message----- > From: Craig Sawyers [mailto:c.sawyers@...] > Sent: Tuesday, January 15, 2002 2:57 AM > To: TekScopes@... > Subject: [TekScopes] Digitizer on eBay > > Hi > > A heads-up for anyone wanting a 7912 digitizer that we were discussing on > the list a few days ago. There is one listed on eBay, item 1690813203 > with > a $19.99 start bid. It weighs 70lb, so it is not one for me - shipping > costs to the UK would be astronomical. > > Craig > > Yahoo! Groups Sponsor > ADVERTISEMENT > > To unsubscribe from this group, send an email to: > TekScopes-unsubscribe@... > > Your use of Yahoo! Groups is subject to the Yahoo! Terms of Service. > > > > > To unsubscribe from this group, send an email to: > TekScopes-unsubscribe@... > > > > Your use of Yahoo! Groups is subject to Yahoo! Groups Sponsor ADVERTISEMENT To unsubscribe from this group, send an email to: TekScopes-unsubscribe@... Your use of Yahoo! Groups is subject to the Yahoo! Terms of Service. |
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