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Re: 7D20 RAMS
Brian Goldsmith
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----- Original Message -----
From: "Miroslav Pokorni" I would say, it came after TI fixed flux wicking. Gosh,after two tinnies of Foster's Lager,I certainly cant say that correctly!!!! :-) Brian Goldsmith |
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Re: 7D20 RAMS
I had something similar with my 7D01, except that RAMs were from even lower
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layer of Pleistocene, they were 1 K capacity. Surprisingly, I was able to find RAMs at the local junker store and price was not too unreasonable. It is interesting that sequence of fixing resembled closely what Fred described: first replacement did not work, but second chip did. Then, I put back the original chip and that worked, so I concluded that problem was with those 'low bidder' sockets that Tektronix' accountants liked to buy for instruments that had lot of DIPs. The sockets looked like infamous TI products, but judging from age of the plug-in, I would say, it came after TI fixed flux wicking. Regards Miroslav Pokorni ----- Original Message -----
From: "pe1fbo" <sh331182@...> To: <TekScopes@...> Sent: Sunday, February 29, 2004 6:07 AM Subject: [TekScopes] 7D20 RAMS Hi All, |
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Re: 7D20 RAMS
Robert Morein
4116 RAMs did not have completely standard refresh requirements. The RAMs that fail probably need to work with a different refresh controller.
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----- Original Message -----
From: pe1fbo To: TekScopes@... Sent: Sunday, February 29, 2004 9:07 AM Subject: [TekScopes] 7D20 RAMS Hi All, Today I fixed my 7D20, it had come up with an error, (fail 531). A closer look in the manual pointed to U710, a dynamic RAM (4116) from the prehistoric ages. All RAMS on the memory board where from ITT, date code 8232 and 8237 and had also a white 'TEK' marking. I replaced the bad chip with one from a scrap TEK 9100 logic analyser, also an ITT chip, and made me wonder, because this chip gave me exactly the same error.... So was it perhaps something else ? However a 9100 has 16 4116 so I took an other one, this time an NEC one with a white TEK marking... And this seemed to be working fine. This made me curious and I started to test them all. I found three other ITT chips which were bad, non of the NEC or Mostek chips failed. Could it be that the ITT chips are of inferior quality, or is the chip OK and is this a timing problem in the design of th 7D20 ?. I must say, that the scrap 9100 was also failing due to a bad uP board, the cause is still unknown. Here are the error codes and their chips associated in case you have a similar issue with the RAMS. Dynamic RAMS 4114 521 U910 53 U810 531 U710 532 U610 5321 U510 54 U410 541 U310 542 U210 Static ones 321 U900 4 U800 41 EAROM - Fred de Vries ps look at for a similar case Yahoo! Groups Sponsor ADVERTISEMENT ------------------------------------------------------------------------------ Yahoo! Groups Links a.. To visit your group on the web, go to: b.. To unsubscribe from this group, send an email to: TekScopes-unsubscribe@... c.. Your use of Yahoo! Groups is subject to the Yahoo! Terms of Service. |
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Re: Tektronix Parts
Dan Szubra
Hi Jon P.
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This local electronic surplus company in Cleveland OH, has the FND357's in stock per there database (300pcs).Here is their website Best of Luck Dan Szubra P.S I have parts for Tek547 scopes if you know anybody that may be looking -----Original Message-----
From: jdpetrzelka [mailto:j.petrzelka@...] Sent: Sunday, February 29, 2004 1:14 PM To: TekScopes@... Subject: [TekScopes] Tektronix Parts First of all, Thanks to all who steered me to the govt. manuals web-sight last weekend. Today I'm looking for a 7 segment led display, Tek #150-011-01, Fairchild #FND5169 or FND357, and a decoder driver, Tek #156-0379-00 or any substitute, Thanks in advance for any leads,Jon P. ---------------------------------------------------------------------------- -- Yahoo! Groups Links a.. To visit your group on the web, go to: b.. To unsubscribe from this group, send an email to: TekScopes-unsubscribe@... c.. Your use of Yahoo! Groups is subject to the Yahoo! Terms of Service. |
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Re: Tektronix Parts
Greyhawk
Try Here For Displays
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And For Drivers Greyhawk ----- Original Message -----
From: jdpetrzelka To: TekScopes@... Sent: Sunday, February 29, 2004 13:13 Subject: [TekScopes] Tektronix Parts First of all, Thanks to all who steered me to the govt. manuals web-sight last weekend. Today I'm looking for a 7 segment led display, Tek #150-011-01, Fairchild #FND5169 or FND357, and a decoder driver, Tek #156-0379-00 or any substitute, Thanks in advance for any leads,Jon P. ------------------------------------------------------------------------------ Yahoo! Groups Links a.. To visit your group on the web, go to: b.. To unsubscribe from this group, send an email to: TekScopes-unsubscribe@... c.. Your use of Yahoo! Groups is subject to the Yahoo! Terms of Service. |
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Tektronix Parts
jdpetrzelka
First of all, Thanks to all who steered me to the govt. manuals
web-sight last weekend. Today I'm looking for a 7 segment led display, Tek #150-011-01, Fairchild #FND5169 or FND357, and a decoder driver, Tek #156-0379-00 or any substitute, Thanks in advance for any leads,Jon P. |
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Texas swap meets?
Darrin Conniff
Hello,
I am sending this in hopes that a fellow Texan in the group may know of any swap meets. Preferrably near San Antonio or Austin, even Dallas. All I can find here in San Antonio are "flea markets" where the most "high tech" devices sold are statues of Buddha. Although I think Buddha is kinda cool, I am looking for Tek equipment. The worst part is that I found a federal & state surplus outlet 3 miles from my house that has 'scopes for $20-$80.00. But they are sold only to other agencies, or some types of non-profit groups. Please! Does anyone know of a place or annual event, anything? I will drive 300 miles, if needed. Thanks in advance, Darrin |
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7D20 RAMS
pe1fbo
Hi All,
Today I fixed my 7D20, it had come up with an error, (fail 531). A closer look in the manual pointed to U710, a dynamic RAM (4116) from the prehistoric ages. All RAMS on the memory board where from ITT, date code 8232 and 8237 and had also a white 'TEK' marking. I replaced the bad chip with one from a scrap TEK 9100 logic analyser, also an ITT chip, and made me wonder, because this chip gave me exactly the same error.... So was it perhaps something else ? However a 9100 has 16 4116 so I took an other one, this time an NEC one with a white TEK marking... And this seemed to be working fine. This made me curious and I started to test them all. I found three other ITT chips which were bad, non of the NEC or Mostek chips failed. Could it be that the ITT chips are of inferior quality, or is the chip OK and is this a timing problem in the design of th 7D20 ?. I must say, that the scrap 9100 was also failing due to a bad uP board, the cause is still unknown. Here are the error codes and their chips associated in case you have a similar issue with the RAMS. Dynamic RAMS 4114 521 U910 53 U810 531 U710 532 U610 5321 U510 54 U410 541 U310 542 U210 Static ones 321 U900 4 U800 41 EAROM - Fred de Vries ps look at for a similar case |
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Re: Looking for an old Tek 130 LC Meter Manual
Robert Fincher
Hi there,
Try bama.sbc.edu/tektroni.htm. Rob Fincher --- wshawlee2 <walter2@...> wrote: --------------------------------- If anybody knows of a downloadable or for-sale manual for this old instrument, I'd like to know. Just got one for free, and with a fresh new pilot lamp and 6X4 tube, it seems to be working pretty well. I'd just like to cal it. it's quite an amazing instrument, never seen anything else that really measures such low values, very handy for Rf work. all the best, walter Yahoo! Groups SponsorADVERTISEMENT Click Here --------------------------------- Yahoo! Groups Links To visit your group on the web, go to: To unsubscribe from this group, send an email to: TekScopes-unsubscribe@... Your use of Yahoo! Groups is subject to the Yahoo! Terms of Service. Find local movie times and trailers on Yahoo! Movies. |
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Re: Tek 570 missing 7 pin tube adapter.....
Craig Sawyers
Was the fire set by disgruntled customers?<grin>. I was wrong about the number of XKSS's though - there were 16 made before the fire - and they tend to go for around $1m on the rare occasion that one comes up for sale. Still in my view one of the most beautiful cars of all time; there are some good shots here And just so you know that I'm not a single marque guy, another all-time favourite of mine is Carroll Shelby's original Cobra. Astonishingly, he's still around, and still making superb cars - . Craig |
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Re: Tek 570 missing 7 pin tube adapter.....
They must be, I just wonder who spreads that vicious rumor.
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Regards Miroslav Pokorni ----- Original Message -----
From: "jeans" <jeans@...> To: "Miroslav Pokorni" <mpokorni2000@...> Cc: <TekScopes@...>; "Craig Sawyers" <c.sawyers@...> Sent: Saturday, February 28, 2004 7:38 PM Subject: Re: [TekScopes] Tek 570 missing 7 pin tube adapter..... Ohh Miroslav, Jaguars are nice.Jaguar, only 6when only 54 of each were ever manufactured. Or an XKSS, of which were made before Jag's factory burned down in a fire in 1957. NotWas the fire set by disgruntled customers? |
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Re: Tek 570 missing 7 pin tube adapter.....
jeans
Ohh Miroslav, Jaguars are nice.
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Don Black. Miroslav Pokorni wrote: It is a bit like finding an original spare for a C-type or D-type Jaguar,Was the fire set by disgruntled customers? |
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Re: Tek 570 missing 7 pin tube adapter.....
It is a bit like finding an original spare for a C-type or D-type Jaguar,Was the fire set by disgruntled customers? Regards Miroslav Pokorni |
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Re: Recommendations?
John,
Since this will be your first and only scope, for a while, try to get a scope from a seller willing to say it was thoroughly checked out. Most eBay scopes have problems - great for me, since I like fixing them. Bad for you. And these scopes have many functions that you will eventually want to learn to use. A scope shown displaying a signal may still have many problems. A scope guaranteed to be in decent condition will probably (SWAG alert) cost 50% to 100% more than a scope that "powers up and displays a signal". Fixer-upper/parts scopes are for fools like me. Unless you are dealing with freqs over 50 MHz, most the old Tek analog scopes will do you well. Larger screens are nice, but not as important for you as guaranteed workability. Newer scopes will usually have fewer aging problems and larger screens, but their prices go up rapidly while actually providing few new operational features. In other words, I would place condition above the actual model type for your purposes. Good luck. -Howard --- In TekScopes@..., "John" <NYCSPIRIT@R...> wrote: I am looking for a good reliable used Tek scope to learn on anduse for amateur radio repairs. I see many up for sale on eBay andwould welcome any advice on which I should consider, and which should bewould like to spend up to $200, but would possibly consider going ashigh as $350 if there is a compelling reason to do so. Thanks inadvance for your advice and counsel. |
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Re: Tek 570 missing 7 pin tube adapter.....
There was a 570 in an auction on GL last month.
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-----Original Message-----
From: Craig Sawyers [mailto:c.sawyers@...] Sent: Saturday, February 28, 2004 4:46 PM To: TekScopes@... Subject: RE: [TekScopes] Tek 570 missing 7 pin tube adapter..... > Any ideas on where to go for this - Dean Kidd et al have been no > help...for past 7 years....I've already fashioned one from scratch > for the 9 pin adapter and it was a major PITA. I've made the template > for the 7 pin and lost interest :-P Wow - a Tek 570! You're a lucky chap to have one of these in the first place. Consider the statistics - I've heard it said that ony 2000 of these units were originally made. Lets assume that 10% of these haven't ended up in the crusher in the last 50 years - that means that there are only 200 (or fewer) left in the world. Now what is the chance of being able to find a spare adaptor? It is a bit like finding an original spare for a C-type or D-type Jaguar, when only 54 of each were ever manufactured. Or an XKSS, of which only 6 were made before Jag's factory burned down in a fire in 1957. Not dissimilar rarity, or vintage, to the 570. Craig Yahoo! Groups Sponsor ADVERTISEMENT ---------------------------------------------------------------------------- -- Yahoo! Groups Links a.. To visit your group on the web, go to: b.. To unsubscribe from this group, send an email to: TekScopes-unsubscribe@... c.. Your use of Yahoo! Groups is subject to the Yahoo! Terms of Service. |
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Re: Tek 570 missing 7 pin tube adapter.....
Craig Sawyers
Any ideas on where to go for this - Dean Kidd et al have been noWow - a Tek 570! You're a lucky chap to have one of these in the first place. Consider the statistics - I've heard it said that ony 2000 of these units were originally made. Lets assume that 10% of these haven't ended up in the crusher in the last 50 years - that means that there are only 200 (or fewer) left in the world. Now what is the chance of being able to find a spare adaptor? It is a bit like finding an original spare for a C-type or D-type Jaguar, when only 54 of each were ever manufactured. Or an XKSS, of which only 6 were made before Jag's factory burned down in a fire in 1957. Not dissimilar rarity, or vintage, to the 570. Craig |
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Re: Carts for scopes?
Dave Henderson
Tim
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The 7000 series all use the the "Model 3" cart. Among other things the Model 3 comes with a "locking mechanism" which secures the 7000 Series scope to the cart. The model 3 comes standard with a drawer in the base and optional shelves or drawers which are attached underneath the scope shelf. The model 3's go for $25-$100 on Ebay depending on condition and number of optional shelves. They are heavy 50+ lbs and oversized by the time you get one in a box, so beware when you buy one shipping is not trivial and can run more than the purchase price of the cart !!! Dave At 05:13 PM 2/28/2004 -0500, timothy.urban@... wrote:
Does anybody have a cheat sheet on which carts go with which families of |
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