Keyboard Shortcuts
ctrl + shift + ? :
Show all keyboard shortcuts
ctrl + g :
Navigate to a group
ctrl + shift + f :
Find
ctrl + / :
Quick actions
esc to dismiss
Likes
- TekScopes
- Messages
Search
|
Re: WTD: 7704A Power Supply
As far as I know (which doesn't go very far), all the 7K scopes used the same
connector system. I've never seen one with a conventional PCB connector for instance. A trait I like about the 7K backplane connectors is they allow easy/smooth plugin insertion and withdrawal. An obvious thing to try first is one of the DeOxit products. This has been mentioned before and I must say I've had great luck with the stuff, usually on the cheap (tin) platings. Maybe this is less helpful with the gold/gold plate that Tek used on the 7K contacts. Don |
|
On screen display and other CRT items....
wshawlee2
The "ripple" in the on screen display function of the Tek 7K frames
was a deliberate thing. It was used to prevent phosphor burn by moving the display around slightly, enough to prevent phosphor burn, but hopefully not enough to be visually irritating. This problem becomes very complex in storage scopes, and there are several options to do this in different ways, plus many have the display deleted altogether to avoid the problem. Very late scopes have a different symbol generator card set, and the display does not move, plus the characters look a bit different. I am not sure if they got tired of service complaints about the wiggling display or what, but the "8"'s certainly looked better. The focus of this display function is tricky, as it is a brief time- multiplexed data item in the over-all horizontal sweep process. Its intensity is high to be visible (because the time is short), and this makes the gun dynamics different during this brief interval. This often means a subtle difference in focus or astigmatism occurs. Interestingly, if the data display is far out of focus, it invariably seems to be tied to a weak CRT, and is an early indicator it needs replacing. Tubes in this state also exhibit the odd "decreasing intensity" trait at very high intensity control settings. Many people leave their scopes on (at high intensity) all day. This is very foolish, as it consumes the one thing you can't easily replace in the scope, the CRT. Many HP network analyzer guys did the same thing, and there are now hundreds of them running around trying to get replacement CRTs, which simply don't exist. Their $20K analyzers are now dimly lit doorstops. There is a way to work around this situation, but it's not simple. Good practice is to keep intensity low, and the scope/analyzer off when not in use. A surge protected power bar is an excellent idea, as the switching regulators had no real over-voltage protection until very late in the 22xx series production. A $25 accessory can save your scope from total death. all for now, walter |
|
Re: TM500/5000 and 5000 series scopes
deanhuster
Walter, don't forget the military's definition of "portable": it has
handles. Most folks argue about the portability of a 555 or 556. Still, the TM506, fully loaded, was a darned sight lighter and less bulky than the six individual items of equipment that it replaced. I always sat the TM504 or 506 on the bench with the 7K scope on top. When I used the TM515, I had to build a 3/4" plywood "U" shaped box to set over it to support the 7904 since the top of the TM515 wasn't flat. And that's why I modified the TM515 to have a pull-push power switch on the front panel. I didn't want to have to reach around behind all that mess to find the switch. Dean |
|
Re: CT501 for a TM500-seried power module
deanhuster
Thanks, guys. I was having a senior moment. "Lemo connector" used
to just roll off my lips when I worked for Tek. A very-finely machined component that's a pleasure to use. And it's the 4-pin version from the DM501 that I used on my Frankensteinian CT501 so that I could get a lot of connector into a small space. The 2-pin version was used for the temperature probe on the DM40/43/44 backpacks for the "new" 400-series portables and the DM502. Dean |
|
Re: Info: 564B found FS in Wollongong, Australia
Michael
Er - OK, Wollongong is in Australia, right? So $165 is Aussie dollars?Yes, and yes. That would make it around $80US or around ?60UK. At that price, I'd snapit up. If I wasn't on the other side of the planet, that is :-)Hmmm... sorry about that, chief... Unfortunately, I don't have $165 to spend, or I'd have snapped it up too, but $165 to an Aussie (at least to this one) represents many more working hours than the corresponding $80 or so to a US citizen, I suspect. And given the weight of the thing, shipping would cancel out the bargain value, assuming it arrived undamaged. Oh well, I'll keep my eye on it, and if the price comes down I'll go for it then... Regards, :) Michael |
|
Re: WTB: Tektronix 7D01 w/DF1(or DF2)
Ashton Brown
Apropos - I sold one of [the pair] to a person in Spain via eBay, many
toggle quoted message
Show quoted text
moons ago. Also sent a HP --> UK with no problems. 7D01 arrived OK via US parcel post. I could occasionally be a middleman: some wimps on eBay check the "US only" box. Thus if you just gotta have something from such a seller - perhaps I could tranship for you. My local post office is a few blocks away and tiny = no lines. You'd have to be aware of size/wt. limitations and apprise me of what to put on for customs, given your local conditions. (I have PayPal - not sure if that is Int'l yet, but it could work for paying seller while waiting for your funds..) Doubt this would be practical for say, a 519! or anything so massive as to virtually demand 'foam-in-place' to arrive safely, but I could repack smaller things - according to physics Laws. (This doesn't mean to be an ad - but, I have quite a few Teks too; from 2xx, 3xx 4xx - and 7xxx from pristine to.. 'needs ~ work'. Even Rb and a quartz freq std and a spare 7854!. No, not a resale bizness - though it sometimes comes close.. in swapping for the keepers. As I'll likely Not get to doing minor fixes on several I planned to, anytime soon : well, nuff said) I encountered my first Tek (514AD?) at LBL in '56. Amazing to be able now to acquire the best of the best, as I see the toy digital displays drawing pretty pictures.. sometimes divorced from er reality or, if you want near-Real: at $20K+ $US. {sheeesh} Built my ESR meter from 'Stralia via Canada.. but haven't yet let it attack those stealth-bad electrolytics.. in a couple 485s {sigh} It is a nice hack though and.. it actually does read ESR! (equivalent series resistance - too many TLAs in the world) Just a thought, Ashton (in N. California US) Craig Sawyers wrote: 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 |
|
Re: WTD: 7704A Power Supply
Don Black
Hi,
toggle quoted message
Show quoted text
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: |
|
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: |
|
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 |
|
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: |
|
Re: WTD: 7704A Power Supply
Lynn Lewis
Don, that sounds like some very good advice. I'll look for replacements for
toggle quoted message
Show quoted text
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. |
|
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 |
|
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 |
|
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 |
|
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 |
|
Re: WTD: 7704A Power Supply
Lynn Lewis
Okay, guys. Here's the deal. I have the 7704A working but I need some
toggle quoted message
Show quoted text
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. |
|
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 |
|
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, --
toggle quoted message
Show quoted text
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. |
|
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: |
|
Re: Digitizer on eBay
Lynn Lewis
Stan
toggle quoted message
Show quoted text
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. |
to navigate to use esc to dismiss