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Cleaning corrosion from Leaking Batteries
开云体育I’m looking for a solution to cleaning up and restoring to usable condition printed circuit boards and their electronic components that were subjected to the electrolyte from a leaking NiCd battery. ? One person suggested the supermarket product “CLR” (Calcium/Lime/Rust manufactured by Jelmar). It does seem to clean off some of the corrosion but I have no idea what the long term effects of the CLR are on the electronics. ? Dennis |
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Oh No, I need the T912 CRT pin out?
I have a T912 that had heavy use and was not working that I was given.
I fixed a number of transistors and got a trace working but still had some intermittent problems. For practice, I decided to give it a bath (simple green, distilled water, blow dry and dehydrate) before proceeding with additional work. All was going well, lots of pictures taken for reassembly, found a number of problems that could be the intermittent focus and trigger problems. In the cleaning process I took out the CRT and removed the back connector. The Problem: The black plastic Key pulled off the CRT and pins with the socket. I took lots of pictures but all the wire looks black and not quite in enough focus to get it back right for sure. I know which way is up because of the front of the crt, and the numbers go from 1 to 14 clockwise on the socket, if looking from the back side of the tube. But I don't know for sure where pin one is. I have downloaded the parts of the T912 manual from the web and looked at the T921-922 manual and can not find a indication of pin 1. The scope will come out of the home made dehydrator this weekend and I would like to put it back together. Question where is the physical location of pin one on the CRT in a T912 or where can one find out Thanks for any help John Snyder |
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Re: Manual or schematic available for the High Amplitude PulseGenerator?
Interesting.
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Does it say "WARNING 80V on Center Conductor" above the SMA like it does on the GR874 ones? Does it look like there was a larger hole for a GR874 where the SMA is? Dennis -----Original Message-----
From: TekScopes@... [mailto:TekScopes@...] On Behalf Of Craig Sawyers Sent: Thursday, February 21, 2013 11:10 PM To: TekScopes@... Subject: RE: [TekScopes] Manual or schematic available for the High Amplitude PulseGenerator? ==================== Which One? There are three: ? The 1st one Tek made has no Tek part number on it but it does say on the front panel: High Amplitude Pulse Generator. This unit has a Step Attenuator, Variable Amplitude control, and a GR874 plug which you connect a length of coax to. The coax acts as a charged line and determines the duration of the output pulse. ==================== Mine has an SMA for the charge line. But that is in addition to an internal charge line. Craig ------------------------------------ Yahoo! Groups Links |
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7L13 & other Tek SAs
开云体育A note for the archive.? Telonic Berkley,
makers of the RF Attenuators often fitted to the 7L12/13/14 SA?still
exist.? For anyone?with a (partially) duff attenuator they can supply
replacement chip parts.? They do not make a replacement for the rotor as a
whole - the RF Attenuators used in these Tek SAs have a hollow rear extension
shaft. The alternative attenuator from Weinschel has incompatible
parts.
Chris
HJ |
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Re: Cleaning nickel-plated adapters and input connectors? Magic formula?
Rob
开云体育Tarnex is the best I have found if you want to be quick and consistent. I think the amount of metal loss is trivial. Rinse and neutralization are key. ? Most all of the ‘wives tale’ methods of silver detarnishment …bam made up ?a word…. work as well. A web search will delineate them better than I can. I cannot think of any that would cause major damage. ? On a side track, I have become intrigued by reverse electrolysis methods of both cleaning rusted iron and tarnished silver and aluminum. Archeological metal restoration.? By and large all of them work by making the material you want to clean/derust/deoxidize the positive place it in an electrolyte solution (preferably with one of the salt constituents the metal of interest if not then a gass/inert)…throw in a suitable sacrificial material on the negative…. and then…..the key is….. ?low current vs. high…. ? In any event, I realize very un technical in my description above as I have not perfected anything yet and tried to keep it general. I have however brought some old military connectors and other things I am restoring back to brilliant condition. (not to much better than a Tarnex treatment in the case of connectors hence starting with that). ? ? Anyway, hopefully helpful Rob ?? ? From: TekScopes@... [mailto:TekScopes@...] On Behalf Of Cliff White
Sent: Friday, February 22, 2013 4:08 PM To: TekScopes@... Subject: Re: [TekScopes] Cleaning nickel-plated adapters and input connectors? Magic formula? ? ? If you can get to all of it, a pencil eraser actually works pretty well. It would be tougher to get around the base, though.
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Re: Tek 2465b display drifting up and down
开云体育Thanks for the advice. All four channels looked reasonable and I didn't notice any?non-linearity, but I only spent a few minutes with the scope. I'll get methodical next.I did notice some crosstalk between Ch1 and Ch2, when I was feeding 100 MHz, 1Vrms into Ch2, so I'll take a look at the switches too. Thanks, -Scott On Feb 22, 2013, at 5:07 PM, David <davidwhess@...> wrote:
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Re: Tek 2465b display drifting up and down
I would start looking on schematic 6 since the vertical drift affects
everything. If it is a failure in U600 or U400 then there is not much to be done but there are other possible. The channel switch digital inputs which select what to display, VS1 through VS4, might not be switching all of the way. The vertical centering signal into pin 39 of U600 might be drifting. I would disconnect the dynamic centering and then adjust the vertical and horizontal centering adjustment and see how that changes things. Do all 4 input channels work over the full vertical range of the CRT without any non-linearity? On Fri, 22 Feb 2013 14:34:35 -0700, Scott Harris <scottrharris@...> wrote: I just received a 2465b and it seemed fine on my initial check. However, after leaving it on for several minutes, the readout and display started to drift up and down. At times, the top of the readout was off the screen. |
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Re: 2456B whole display moved up on the CRT
Have you made any progress on this issue? I just received a 2465b today and it does the same thing after warming up for a while.
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Good luck! -Scott --- In TekScopes@..., "allegretto2a" <allegretto2a@...> wrote:
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Re: Cleaning nickel-plated adapters and input connectors? Magic formula?
开云体育If you can get to all of it, a pencil
eraser actually works pretty well. It would be tougher to get
around the base, though.
On 02/22/2013 02:52 PM, Daniel Koller wrote:
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Tek 2465b display drifting up and down
I just received a 2465b and it seemed fine on my initial check. However, after leaving it on for several minutes, the readout and display started to drift up and down. At times, the top of the readout was off the screen.
I spent a few minutes searching but didn't find any other posts describing a similar issue. I'll keep looking. I'm going to open it and check all the voltage rails and look for leaky caps. Does this problem ring a bell with anyone? Any hints or pointers? Thanks, -Scott |
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Re: Cleaning nickel-plated adapters and input connectors? Magic formula?
Good point! ?I wasn't really thinking. ?They likely are mostly silver since they tarnished black. ?Nickel will probably go greenish (or perhaps that's from the copper underneath that oxidize on a couple connectors I have). If the concern with the Tarnex is removing it, at least on the adaptors I can sonicate them in warm water and that should be effective in removing the solution after a couple?rinses. Dan From: "bonddaleena@..." To: TekScopes@... Sent: Friday, February 22, 2013 3:42 PM Subject: Re: [TekScopes] Cleaning nickel-plated adapters and input connectors? Magic formula?
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Hi Dan. On all the TE I have, the connectors appear to be Silver plated. You could (!) carefully clean them with "Tarnex" liquid. Then clean off that stuff with Windex, etc. Most of the time, I simply give then a quick brushing with a stainless steel detail brush, which looks like a toothbrush. ron N4UE? -----Original Message-----
From: Daniel Koller To: TekScopes Sent: Fri, Feb 22, 2013 3:33 pm Subject: [TekScopes] Cleaning nickel-plated adapters and input connectors? Magic formula?
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Hi folks,
? I am sure this has been asked before, so please point me to the correct links if so. ?A quick search of the archives didn't find anything easily.
? How does one clean t
he nickel-plated adapters and input connectors of old scopes? ?I am thinking of two situations here. ?The first is the BNC or UHF connectors on the panels of the scopes, that cannot be easily removed. ?The second case is things like BNC T's and BNC to UHF adapters and the like which are small and can be completely dipped in some cleaning solution.
? I have a number of adapters and connectors where the nickel is getting black, and they are filthy. ?I would Ideally like to deoxidize them so they come out shiny and new. ?Some sort of chemical dip or a series of washes would be preferred, where I can keep the
amount of physical scrubbing required to a minimum. ?I envision perhaps scrubbing once with a toothbrush (maybe with tooth paste?),?wrinsing?in an ultrasonic bath, then dipping them in some magic formula that shines them up. ?Connectors on the scope would have to be brushed and washed in-situ.
? The question is, what is the magic formula?
? Thanks.
? Dan
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Re: Cleaning nickel-plated adapters and input connectors? Magic formula?
Hi Dan. On all the TE I have, the connectors appear to be Silver plated. You could (!) carefully clean them with "Tarnex" liquid. Then clean off that stuff with Windex, etc.
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Show quoted text
Most of the time, I simply give then a quick brushing with a stainless steel detail brush, which looks like a toothbrush. ron N4UE? -----Original Message----- From: Daniel Koller To: TekScopes Sent: Fri, Feb 22, 2013 3:33 pm Subject: [TekScopes] Cleaning nickel-plated adapters and input connectors? Magic formula?
?
Hi folks,
? I am sure this has been asked before, so please point me to the correct links if so. ?A quick search of the archives didn't find anything easily.
? How does one clean t
he nickel-plated adapters and input connectors of old scopes? ?I am thinking of two situations here. ?The first is the BNC or UHF connectors on the panels of the scopes, that cannot be easily removed. ?The second case is things like BNC T's and BNC to UHF adapters and the like which are small and can be completely dipped in some cleaning solution.
? I have a number of adapters and connectors where the nickel is getting black, and they are filthy. ?I would Ideally like to deoxidize them so they come out shiny and new. ?Some sort of chemical dip or a series of washes would be preferred, where I can keep the
amount of physical scrubbing required to a minimum. ?I envision perhaps scrubbing once with a toothbrush (maybe with tooth paste?),?wrinsing?in an ultrasonic bath, then dipping them in some magic formula that shines them up. ?Connectors on the scope would have to be brushed and washed in-situ.
? The question is, what is the magic formula?
? Thanks.
? Dan
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Cleaning nickel-plated adapters and input connectors? Magic formula?
Hi folks, ? I am sure this has been asked before, so please point me to the correct links if so. ?A quick search of the archives didn't find anything easily. ? How does one clean the nickel-plated adapters and input connectors of old scopes? ?I am thinking of two situations here. ?The first is the BNC or UHF connectors on the panels of the scopes, that cannot be easily removed. ?The second case is things like BNC T's and BNC to UHF adapters and the like which are small and can be completely dipped in some cleaning solution. ? I have a number of adapters and connectors where the nickel is getting black, and they are filthy. ?I would Ideally like to deoxidize them so they come out shiny and new. ?Some sort of chemical dip or a series of washes would be preferred, where I can keep the
amount of physical scrubbing required to a minimum. ?I envision perhaps scrubbing once with a toothbrush (maybe with tooth paste?),?wrinsing?in an ultrasonic bath, then dipping them in some magic formula that shines them up. ?Connectors on the scope would have to be brushed and washed in-situ. ? The question is, what is the magic formula? ? Thanks. ? Dan |
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Re: Tek 567 spotted in 1967 DEC Logic Handbook
开云体育Very nice!
?
In a message dated 2/22/2013 9:33:26 A.M. Pacific Standard Time,
sipespresso@... writes:
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Re: [TekScopes2] Oil of Wintergreen
DaveC
Thanks for that Mark. Another tool in the box.
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Dave Sent from my iPhone On Feb 22, 2013, at 10:46 AM, "mark101234" <mhb55@...> wrote:
I am not sure how many people are aware of Oil of Wintergreen penetrating properties, so I though I would point it out. Oil of wintergreen is very wet,it will creep into very close fits. Oil of Wintergreen appears to be very inert I have not had it affect rubber or any plastics,unlike some commercial products. I am not sure about it's long term lubrication properties, it may be a good idea to follow it up with an oil. |
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535 and 585 4 sale
Ron
I have these almost since they were new and now need to find a good home for them both. The tubes are good nice sharp traces, but the 585 needs a HV cap replaced, and the 535 is slow to warm up..I live in Southern California so shipping is a nuisance unless local. However I will ship anywhere if you pay shipping. Will sell together separately. Best offer taken as must go by end of March.
Thanks guys... |
David Hess