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Ferrite Beads in Tek Transistor Adapters
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Tek uses ferrite beads in some of the transistor adapters they make for
their curve tracers. These beads are inserted in each (E, B, and C) lead of the adapter. I always assumed the purpose of the beads is to prevent the transistor from oscillating but I don't really know this for sure. Does anyone know what frequency band Tek was concerned about or what ferrite Tek used? There are many ferrite materials to choose from. The few I am familiar with are FB-43, FB-61, FB-73, and FB-75B. The 013-0128-00 adapter specifically for the 7CT1N and 5CT1N uses three 276-0507-00 "SHLD BEAD,ELEK:FERRITE" for example. But there is no more information than this on the one or two page data sheet that comes with a transistor adapter. I would guess Tek would chose ferrite material that is intended for relatively low frequencies (maximum resistive loss at 10MHz or less) but that is only a guess. Dennis Tillman W7pF
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Dave Casey
Can you look up the bead in the Tek standard parts catalog and determine
its characteristics from there? Dave Casey On Sat, Jul 18, 2020 at 9:30 PM Dennis Tillman W7pF <dennis@ridesoft.com> wrote: Tek uses ferrite beads in some of the transistor adapters they make for
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Chuck Harris
The purpose of the beads is to make the connections
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to the transistors both high impedance, and lossy at the frequencies the transistor might try to oscillate. Any of the of the ferrite bead materials will do the job. -Chuck Harris Dennis Tillman W7pF wrote:
Tek uses ferrite beads in some of the transistor adapters they make for
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Glydeck
For curve tracer fixtures I’ve made I used these with good results.
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https://www.allelectronics.com/item/fb-73/ferrite-bead-on-lead/1.html Glydeck
On Jul 19, 2020, at 9:50 AM, Chuck Harris <cfharris@erols.com> wrote:
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Roy Thistle
On Sun, Jul 19, 2020 at 12:38 PM, Glydeck wrote:
WARNING: May cause cancer or reproductive harm?.. at least in the state of California?
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Chuck Harris
Everything is known to cause cancer in the state of
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California.... Makes me glad I don't live there. -Chuck Harris Roy Thistle wrote:
On Sun, Jul 19, 2020 at 12:38 PM, Glydeck wrote:WARNING: May cause cancer or reproductive harm?.. at least in the state of California?
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Carsten Bormann
On 2020-07-20, at 03:20, Chuck Harris <cfharris@erols.com> wrote:
They say: Why is this here? As of August 2018 the State of California has changed the requirements of the "Prop 65" law. We now must list on our website any possible chemicals the can cause cancer, birth defects or reproductive problem. As an example: • ABS plastic contains styrene • PVC wire insulation can contain Di(2-ethylhexyl)phthalate (DEHP) • electrolytic capacitors can contain Ethylene glycol • Brass can contain Lead • flame retardant pc boards can contain Tetrabromobisphenol A (TBBPA) • Aluminum alloys can contain Chromium To put it simply we are a small company and do not have the resources to test every single part, so we list every thing as hazardous. Please recycle all electronic parts responsibly and under no circumstance eat, drink or smoke these parts and wash your hands after touching! Typical cop-out created by non-thinking regulation. But I generally agree with the advice not to try smoking ferrite beads. Grüße, Carsten
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Dave Seiter
As a former environmental compliance guy in CA, I can say that it's mind-numbingly inane. Everything is potentially toxic or dangerous- it's just a matter of quantity/frequency (drinking too much water can kill you, you can be crushed by cabbages, anaphylaxis from cat hair, etc)
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At some point, all the warnings become meaningless, kind of like advertising (which I ignore and remove whenever possible). The nanny state at it's finest, thanks mostly to lawyers... OTOH, it might be nice if older Tek scopes had warnings about weight (don't try to pick up a 519 if your back has been acting up!) -Dave
On Sunday, July 19, 2020, 06:35:20 PM PDT, Carsten Bormann <cabocabo@gmail.com> wrote:
On 2020-07-20, at 03:20, Chuck Harris <cfharris@erols.com> wrote: They say: Why is this here? As of August 2018 the State of California has changed the requirements of the "Prop 65" law. We now must list on our website any possible chemicals the can cause cancer, birth defects or reproductive problem. As an example: • ABS plastic contains styrene • PVC wire insulation can contain Di(2-ethylhexyl)phthalate (DEHP) • electrolytic capacitors can contain Ethylene glycol • Brass can contain Lead • flame retardant pc boards can contain Tetrabromobisphenol A (TBBPA) • Aluminum alloys can contain Chromium To put it simply we are a small company and do not have the resources to test every single part, so we list every thing as hazardous. Please recycle all electronic parts responsibly and under no circumstance eat, drink or smoke these parts and wash your hands after touching! Typical cop-out created by non-thinking regulation. But I generally agree with the advice not to try smoking ferrite beads. Grüße, Carsten
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On Fri, Jul 24, 2020 at 09:30 PM, Dave Seiter wrote:
This is why we have "Warning" labels on Preparation H that states "not to be taken orally". -- Michael Lynch Dardanelle, AR
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Stephen
On Sat, Jul 25, 2020 at 03:11 AM, Michael W. Lynch wrote:
This is why we have "Warning" labels on Preparation H that states "not to be😂😂😂
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Glydeck
You should click on The link “Why is this here” on the All Electronics page. This would be the reality of good intentions gone wrong and ultimately becoming useless.
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“As of August 2018 the State of California has changed the requirements of the "Prop 65" law. We now must list on our website any possible chemicals the can cause cancer, birth defects or reproductive problem. To put it simply we are a small company and do not have the resources to test every single part, so we list every thing as hazardous. Please recycle all electronic parts responsibly and under no circumstance eat, drink or smoke these parts and wash your hands after touching!”
On Jul 25, 2020, at 7:11 AM, Michael W. Lynch via groups.io <mlynch003=yahoo.com@groups.io> wrote:On Fri, Jul 24, 2020 at 09:30 PM, Dave Seiter wrote:This is why we have "Warning" labels on Preparation H that states "not to be taken orally".
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Chuck Harris
Votes have consequences.
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Glydeck via groups.io wrote:
You should click on The link “Why is this here” on the All Electronics page. This would be the reality of good intentions gone wrong and ultimately becoming useless.
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Glydeck
Chuck,
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Totally agree! So does having or not having a basic education. Staying on topic, the ferrite beads work well for building your own test fixtures. George
On Jul 25, 2020, at 8:02 AM, Chuck Harris <cfharris@erols.com> wrote:
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This forum is all about classic Tektronix test equipment, its use, repair, and collecting.
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This is not a forum about how California chooses to govern itself. What California does or does not do is irrelevant to my original question about ferrites used in Tek Transistor adapters. Dennis Tillman W7pF
-----Original Message-----
From: TekScopes@groups.io [mailto:TekScopes@groups.io] On Behalf Of Dave Seiter Sent: Friday, July 24, 2020 7:29 PM To: TekScopes@groups.io Subject: Re: [TekScopes] Ferrite Beads in Tek Transistor Adapters As a former environmental compliance guy in CA, I can say that it's mind-numbingly inane. Everything is potentially toxic or dangerous- it's just a matter of quantity/frequency (drinking too much water can kill you, you can be crushed by cabbages, anaphylaxis from cat hair, etc) At some point, all the warnings become meaningless, kind of like advertising (which I ignore and remove whenever possible). The nanny state at it's finest, thanks mostly to lawyers... OTOH, it might be nice if older Tek scopes had warnings about weight (don't try to pick up a 519 if your back has been acting up!) -Dave On Sunday, July 19, 2020, 06:35:20 PM PDT, Carsten Bormann <cabocabo@gmail.com> wrote: On 2020-07-20, at 03:20, Chuck Harris <cfharris@erols.com> wrote: They say: Why is this here? As of August 2018 the State of California has changed the requirements of the "Prop 65" law. We now must list on our website any possible chemicals the can cause cancer, birth defects or reproductive problem. As an example: • ABS plastic contains styrene • PVC wire insulation can contain Di(2-ethylhexyl)phthalate (DEHP) • electrolytic capacitors can contain Ethylene glycol • Brass can contain Lead • flame retardant pc boards can contain Tetrabromobisphenol A (TBBPA) • Aluminum alloys can contain Chromium To put it simply we are a small company and do not have the resources to test every single part, so we list every thing as hazardous. Please recycle all electronic parts responsibly and under no circumstance eat, drink or smoke these parts and wash your hands after touching! Typical cop-out created by non-thinking regulation. But I generally agree with the advice not to try smoking ferrite beads. Grüße, Carsten -- Dennis Tillman W7pF TekScopes Moderator
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Daveolla
At 09:11 AM 7/25/2020, you wrote:
This is why we have "Warning" labels on Preparation H that states "not to be taken orally".You can take your Preparation H and shove it where the sun doesn't shine! Dave
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