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Re: Tek 603 - question on transistor heatsinking material
Chuck Harris
It probably shattered when it was tightened. It will do that in
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a blink if the aluminum under it is not perfectly flat. I would goop it up, and put the pieces back into service. I you can't, or are unwilling to do that, replace them all with a thick silicone heatsink pad. The down side is anything but the ceramic will have different a different dielectric constant, and will change the capacitance to ground. That may, or may not be important. -Chuck Harris toby@... wrote: On 2020-07-02 1:00 a.m., John Gord via groups.io wrote:Toby,That sounds probable. It sure is brittle, while this board was hard to |
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Re: Tek 603 - question on transistor heatsinking material
Chuck Harris
It has been reported that Tektronix used BeO ceramic all
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over the place. Some common examples are the heat sink insulators for the 5000 series H and V output transistors. They also used it as the heat sink bar that fits under the EHT for the 657 scopes. This particular heat sink insulator looks probable to me. Some more responsible companies tinted their BeO ceramics pink or purple as a warning, but not tektronix, as far as I have seen. You needn't be terribly fearful, though. If you aren't machining it into a fine dust, you should be ok. Regardless of what it is, you will need heatsink compound. The pieces you have are probably still serviceable, as I doubt there is enough voltage there to jump the thickness of the pad even if it were free air. Goop them up with compound, and screw the device back down. About the only stuff that doesn't need heatsink compound are silicone heatsink pads... which are made out of heatsink compound. -Chuck Harris John Gord via groups.io wrote: Toby, |
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Re: Tektronix 2230
Hello Saroj,
sorry to hear about the breakdown of your replaced parts... :-( Since you already confirmed that the scope worked when fed from a secondary power supply, and I assume it still does? If that's the case, there still must be something wrong with the first switcher... I would check all surrounding parts, and when necessary, remove them before checking, because in-circuit checking can give distracting results. At the moment I do not have other suggestions than to check if the scope is still running on the external 43V power supply, and check again very thoroughly all other parts and their polarity in the first switching part of the power supply... Good luck, Leo Again, sorry for |
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Re: Tek 603 - question on transistor heatsinking material
Toby,
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It looks like there are several devices held in place with a common clamp bar. If that is the case, you need to match thickness fairly well, or perhaps use a thinner insulator like mica while adding a resilient spacer under the clamp bar to compensate for the difference. --John On Wed, Jul 1, 2020 at 11:09 PM, <toby@...> wrote:
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Re: Tek 603 - question on transistor heatsinking material
On 2020-07-02 1:29 a.m., John Gord via groups.io wrote:
Toby,Unless Walter at Sphere has the alumina, I might have to go with mica -- Digikey has some reasonably compatible rectangular pieces. Thanks a lot, John. It was lazy of me not to consult the parts list before posting... --Toby --John Gord |
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Looking for 7D02 Personality Modules
I am looking for the following Personality Modules for the 7D02 Software
Logic Analyzer Plugin. Please contact me off list at dennis at ridesoft dot com if you can help. It is very important that I find these three: PM-111 6809 PERSONALITY MODULE PM101 Option 02 6502 PERSONALITY MODULE PM102 6800 PERSONALITY MODULE It would be nice to find these two: PM101 Option 01 8080 PERSONALITY MODULE PM-111 6809 PERSONALITY MODULE I don't have much hope of ever finding these three: PM-110 Z8001 PERSONALITY MODULE PM-108 Z8002 PERSONALITY MODULE PM-112 MULTIBUS PERSONALITY MODULE The 7D02 is a software logic analyzer plugin for the 7000 series as opposed to the 7D01 which is a hardware logic analyzer plugin. The difference is night and day. * The 7D01 hardware logic analyzer can help you analyze a computer bus or any system with a lot of interconnected signals by simultaneously capturing the timing relationship of up to 16 signals. * The 7D02 software logic analyzer disassembles the addresses and software instructions being executed by a CPU as it steps through its instructions and reads or writes data. In order to do this the 7D02 requires a Personality Module for the particular CPU it will be analyzing. The Personality Module intercepts each software instruction and converts it to human readable instructions and provides this along with the address of the instruction, the data being fetched or written, etc. The useful product lifetime of a logic analyzer is extremely short in part because they are extremely difficult to develop and just about the time they are ready for market the CPU manufacturers come out with newer architectures that make the logic analyzers obsolete. In addition, logic analyzers are very expensive the entire development cost will have to be spread across relatively few customers. A side effect of that is to make customers even more reluctant to invest in something that costs so much if the costs can't be amortized over at least 5 years. Bottom line: Not many 7D02 logic analyzers were ever sold. In order to use the 7D02 you had to also buy the right Personality Module to go with it. Tektronix made 12 different personality modules for the 7D02. These are rather small and easy to be misplaced. After a customer completed development of their product the 7D02 would be put in a cabinet and probably never get used again. The personality module would eventually get separated from the logic analyzer and, since it didn't look like much, eventually it would get tossed. By now the personality modules are almost impossible to find. I have a particularly romantic attachment to the 16-bit CPUs that were prominent in the mid to late 1970s when I built my first personal computer. I learned how to write assembly language for several of those CPUs and disassembling the firmware that is running on these simple CPUs, and debugging the code is some of the most challenging fun I can have. Any help locating the personality modules I am looking for would be greatly appreciated. Dennis Tillman W7pF |
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Re: Tek 603 - question on transistor heatsinking material
On 2020-07-02 1:00 a.m., John Gord via groups.io wrote:
Toby,That sounds probable. It sure is brittle, while this board was hard to remove, there would have been no major shocks, so I was surprised to see it shattered. Hope I can replace it, or is there a better alternative now? --Toby
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Re: Tek 603 - question on transistor heatsinking material
Toby,
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It looks like the part number is 342-0082-00, described as an insulator plate, 0.52" x 0.52" x 0.015", material: alumina (aluminum oxide). It is likely used with thermal compound added, --John Gord On Wed, Jul 1, 2020 at 08:52 PM, <toby@...> wrote:
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Re: Tek 603 - question on transistor heatsinking material
Toby,
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If it is a hard, brittle ceramic-like slab, it is probably alumina (aluminum oxide). It is a good electrical insulator and a reasonably good thermal conductor. Beryllium oxide looks similar, but is unlikely here because of its hazards. --John Gord On Wed, Jul 1, 2020 at 08:52 PM, <toby@...> wrote:
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Tek 603 - question on transistor heatsinking material
Hi,
In preparation for testing/replacing components on the HV & regulator board, I removed it, and seem to have accidentally broken one of the heatsink pads under a bottom transistor (see pic). What is this material? /g/TekScopes/photo/249616/0?p=Created,,,20,2,0,0 Should it be used with thermal paste or not? Thanks --Toby |
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Re: S-52 only works with lowered +15 V power supply
Hi Albert,
sorry for the late reply but during the week I work hardly and in the evening I am too tired to take care of my Teks and I want to avoid mistakes. Anyway I took just now some photos of the pulser while operating, varying the positive supply between 13.5 V and 15.5 V, in 0.5 V intervals. I've created a new photo album, you can see it at the following link: /g/TekScopes/album?id=249667 NOTE: The TD is the original one, carefully reassembled . The optimal voltage seems to be around 14.5V. The pulse are stable and clean.NOTE: The TD is the original one, carefully reassembled . You can see, at 15V the impulse disappears and only the impulse of pre-bias with the ramp remains. The pot R90 (trig level) is almost fully counterclockwise (it's in the original position when I bought the thing). At 15V ,turning it completely ccw I do not get appreciable effects anyway I think the resistors, one or more, changed their values, In the weekend I will check carefully their values. I can confirm that the couple of 2.7 ohm resistors in parallel give me a reading of 2.8 ohm and not 1.4 as it should be ... Max |
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Re: Wikipedia is not an appropriate topic for TekScopes. WAS repair tools: Autotransformers/variacs
Ray, W4BYG
Reg,
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I would be interested. could you provide more detail? Ray, W4BYG at ATT dot net On 7/1/2020 00:17, Reginald Beardsley via groups.io wrote:
I have two of these:-- They say a smart person learns from their mistakes. A wise person learns from the mistakes of others. --
This email has been checked for viruses by AVG. |
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Re: What's the Tektronix part number for a dead spider
At least two of them.
On Mon, Jun 29, 2020 at 1:41 AM snapdiode via groups.io <snapdiode= [email protected]> wrote: Can you see it? |
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Re: D34 ghosting blur
Ahhh I see, so it's a feature not a fault, Denises explanation is really thorough and easy to understand.
Since I replaced the Telequipment special blanking JFET with generic J113 I wasn't sure if what I'm seeing isn't insufficiently closed jfet and therefore what I'm seeing is not some aftereffect of returning blanked beam. It's good to learn there's nothing wrong with the machine |
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Re: 2215 CRT problem, PSU filtering?
That's great Max. Good job. They are nice little scopes.
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Regards, Tom On 7/1/2020 2:16 AM, Maxsimmonds1337@... wrote:
Good news! I replaced the PSU filter caps, and I noticed the 33uF/160V on the 100V PSU output, and it's all good! --
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Re: 2215 CRT problem, PSU filtering?
On Wed, Jul 1, 2020 at 09:10 AM, <tekscopegroup@...> wrote:
This is Very Good advice. I would not go into a scope and just replace one of the caps. They all can easily be in a similar condition in the near future. -- Michael Lynch Dardanelle, Arkansas |
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Re: 2215 CRT problem, PSU filtering?
While in there you might want to replace all the caps that where listed above, so as to future proof the PS section some more. Use nearest value and voltage equal or higher. Modern caps will be smaller in size, so a somewhat higher value will still be an easy fit. Order good quality caps (and any other parts in general) from Mouser.com or similar reputable outfits, avoid ebay china crap.
C937 1800 uF/ 75 V --> Use 2200uF 100V C961 33 uF/ 160 V --> Use 33uF 160V C965 270 uF/ 40 V --> Use 330uF 50V C971, 972, 975, 976, 985 840 uF/ 12 V --> Use 1000uF 16V |
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Mlynch001
Michael W. Lynch
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