Re: tektronix 214 option 94/ Li-Ion fork
Hi Miguel,
What modifications did you make to the charger circuit to adjust it for the
different charging requirements (current limits, voltage cutoff point, etc)
of Li batteries compared to NiCd batteries.
Can you do a test with the scope on (two traces on the screen) with a fully
charged set of batteries and see how long it lasts.
Dennis Tillman W7PF
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-----Original Message-----
From: Miguel Work
Sent: Saturday, August 18, 2018 11:00 AM
Subject: Re: [TekScopes] tektronix 214 option 94/ Li-Ion fork
Hi!
My tektronix 214,221 and 222 is now working with lithium batteries.
/g/TekScopes/photo/66992/1?p=Name,,,20,1,0,0
/g/TekScopes/photo/66992/2?p=Name,,,20,1,0,0
Regards
Miguel
-----Mensaje original-----
De: Kevin> Oconnor
Enviado el: s¨¢bado, 18 de agosto de 2018 4:02
Asunto: Re: [TekScopes] tektronix 214 option 94/ Li-Ion fork
I wouldn't pick to much on Li-Ion chemistry. There are a lot of deployed
chemistries and construction methods. Some have problems some don't,
just like NiCd & NiMH. I've seen plenty of NiCD rotting in their
electronics. Neither Ni has much shelf life, yet I have seen some Li
devices wake up after a year on the shelf.
Realistically, all these chemistries have quirky charging and
discharging requirements. But if I am designing new hardware for the
masses, it is highly unlikely I would be successful selecting NiCd
chemistry. Yes, Li-Ion needs a different charging means, but there chips
and PCBs for that. Yes, they can balloon and catch fire sometimes. That
is a manufacturing QC issue.
Given the choice between a coin NiCd and a postage stamp Li-Ion for a
little rechargeable gizmo device, I'd pick the Li battery every time.
The coin Ni-Cd is soooo Palm-Pilot era!!!!!
Kjo -- Dennis Tillman W7PF TekScopes Moderator
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Re: tektronix 214 option 94
On Sun, 19 Aug 2018 13:38:55 -0700, you wrote:
Scope probes are not detachable for any 211, 212, 213, or 214 scope.
Not in normal use, no. Unfortunately, there's a lot of them where someone just took the probes anyway, they do plug in, but it's internal. Ask me how I found this out... Harvey Dennis Tillman W7PF
-----Original Message-----
From: > Colin Herbert
Sent: Saturday, August 18, 2018 12:02 PM
Subject: Re: [TekScopes] tektronix 214 option 94
This scope is currently on eBay. If it is of any significance, the
probes are permanently wired in, according to the description.
Colin.
-----Original Message-----
From: [email protected] [mailto:[email protected]] On Behalf Of
Miguel Work
Sent: 16 August 2018 10:25
To: [email protected]
Subject: [TekScopes] tektronix 214 option 94
Which is optino 94 for a Tektronix 214?
/g/TekScopes/photo/66992/0?p=Name,,,20,1,0,0
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Re: tektronix 214 option 94
Scope probes are not detachable for any 211, 212, 213, or 214 scope.
Dennis Tillman W7PF
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-----Original Message-----
From: > Colin Herbert
Sent: Saturday, August 18, 2018 12:02 PM
Subject: Re: [TekScopes] tektronix 214 option 94
This scope is currently on eBay. If it is of any significance, the
probes are permanently wired in, according to the description.
Colin.
-----Original Message-----
From: [email protected] [mailto:[email protected]] On Behalf Of
Miguel Work
Sent: 16 August 2018 10:25
To: [email protected]
Subject: [TekScopes] tektronix 214 option 94
Which is optino 94 for a Tektronix 214?
/g/TekScopes/photo/66992/0?p=Name,,,20,1,0,0 -- Dennis Tillman W7PF TekScopes Moderator
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Re: 7L13, more exact frequency readout
Hi again Now I have done quite a few measurements with my 7L13. I just used a know frequency source to tune it into the frequency I am searching for and then I do the measurement. This works well enough for my zero span measurements with resolution of 300kHz. I did buy a frequency meter for up to 5.8GHz and tried to correlate the frequency of the YIG oscillator with the voltage between pin 6 of U2110 and ground with a more precise voltage measurement than the frequency readout contains. Regarding phase locking of LO1. According to the manual, the span is done in the following way: = 5MHz/div: Main coil of the YIG 2MHz/div to 100kHz/div: FM-coil <=50kHz/div: The phase lock loop of LO2, and then the LO1 can be phase locked. I found out that the plugin need through calibration since the center frequency moves quite a lot with changing span. But the nice thing is that I think I have solved the EMC problem the setup was supposed to help solving and my 7L13 is very helpful in my EMC precompliance toolset. Regards Gudjon
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scanned: Common Parts Design Catalog #4, Electro-Mechanical, Jan 1989
This scan was made possible by Pete Lancashire.
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Tek 545 Scope, with tubes, seems intact, but listed as "for parts only" on eBay $100
hi,
Spotted on eBay: Tek 545 with tubes for parts... $100 located in: Crimora, Virginia,
Don't see a scope trace in the photos, but perhaps intensity adj. low, or HV trans. issue ?
Anyway, all those tubes, seems reasonable.
{ no affiliation}
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Re: Concentric A and B time-base knobs/interlocking
Indeed and almost too easy to fix! It turned out that the coaxial wire going to the ext Z-axis BNC had come adrift. Re-soldered and now z-modulation is functioning, but still no bright-up on "A INTEN" and odd behaviour of "B DLY'D" scans, so back to the task of replacing the timing board with that from the parts-donor.
I'm looking forward to having this in a state where I can do a full calibration.
Colin.
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Re: Machinable Potting Material ???
Just try a Helicoil first,
I just fixed some stripped bakelite knobs from a 1920's radio using 4BA Helicoils - worked great!
Adrian
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On 8/18/2018 10:55 PM, Paul Koretko wrote: Greetings,
I'm trying to save a couple old plastic knobs that have stripped set screw threads, that don't have brass inserts. I remember reading someplace about a machinable potting material that is easily flowed into a mold. I've tried JB Weld, but it doesn't flow well. It has a tendency to leave void areas. I want to drill a new set screw hole and hand tap it for 4-40 set screw.
I remember seeing some discussion on potting material on one of the groups I read, so I'm asking for help. Any advice will be appreciated. I will also post this to some of the other groups I read.
TNX es 73 de WABAG ..
Paul K.
|
Re: Machinable Potting Material ???
Epoxy resin mixed with enough ground silica to make a stiff paste then rammed into the hole
Robin
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On 19 Aug 2018, at 05:45, ¸é±ð²Ô¨¦±ð <k6fsb.1@...> wrote:
plastic is fairly soft compared to metal, normal thread is 70%, you can use a smaller tap hole to approach 95% thread, use a good sharp tap. plastic threads will hold better and longer with more thread contact.
I have used heli-coil in a few cases. moved to 5-40 or 6-32 in others.
¸é±ð²Ô¨¦±ð
On 2018-08-18 04:27 PM, Bill Riches wrote:
Is the knob large enough to use a 6-32 set screw? If so make sure you use a correct numbered drill with the tap.
73,
Blll, WA2DVU
Cape Mah
-----Original Message-----
From: [email protected] <[email protected]> On Behalf Of Paul Koretko
Sent: Saturday, August 18, 2018 5:55 PM
To: [email protected]
Subject: [TekScopes] Machinable Potting Material ???
Greetings,
I'm trying to save a couple old plastic knobs that have stripped set screw threads, that don't have brass inserts. I remember reading someplace about a machinable potting material that is easily flowed into a mold. I've tried JB Weld, but it doesn't flow well. It has a tendency to leave void areas. I want to drill a new set screw hole and hand tap it for 4-40 set screw.
I remember seeing some discussion on potting material on one of the groups I read, so I'm asking for help. Any advice will be appreciated. I will also post this to some of the other groups I read.
TNX es 73 de WABAG ..
Paul K.
|
Re: Machinable Potting Material ???
plastic is fairly soft compared to metal, normal thread is 70%, you can use a smaller tap hole to approach 95% thread, use a good sharp tap. plastic threads will hold better and longer with more thread contact.
I have used heli-coil in a few cases. moved to 5-40 or 6-32 in others.
¸é±ð²Ô¨¦±ð
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On 2018-08-18 04:27 PM, Bill Riches wrote: Is the knob large enough to use a 6-32 set screw? If so make sure you use a correct numbered drill with the tap.
73,
Blll, WA2DVU
Cape Mah
-----Original Message-----
From: [email protected] <[email protected]> On Behalf Of Paul Koretko
Sent: Saturday, August 18, 2018 5:55 PM
To: [email protected]
Subject: [TekScopes] Machinable Potting Material ???
Greetings,
I'm trying to save a couple old plastic knobs that have stripped set screw threads, that don't have brass inserts. I remember reading someplace about a machinable potting material that is easily flowed into a mold. I've tried JB Weld, but it doesn't flow well. It has a tendency to leave void areas. I want to drill a new set screw hole and hand tap it for 4-40 set screw.
I remember seeing some discussion on potting material on one of the groups I read, so I'm asking for help. Any advice will be appreciated. I will also post this to some of the other groups I read.
TNX es 73 de WABAG ..
Paul K.
|
Re: Machinable Potting Material ???
He is wanting to replace stripped inserts in knobs, seems like a great
application for easily tap-able jb weld. No concern about viscosity in that
application.
I'm not sure Micromark's bismuth/tin allow would hold a thread for very
long though.
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On Sat, Aug 18, 2018 at 8:05 PM james morton <JRM38510@...> wrote: Warming the JB Weld will decrease the viscosity. I used to pot solid
state modules for the side-winder AIM_9H using Hysol epoxy, it was done in
a vacum chamber, no voids or bubbles allowed.
On Sat, Aug 18, 2018 at 5:21 PM, Richard L. Wurdack <dickw@...>
wrote:
Micromark has some low-temp casting materials <= 160 degrees F. (Metal)
R.
----- Original Message ----- From: "Mike D" <vfd.ninja@...>
To: <[email protected]>
Sent: Saturday, August 18, 2018 4:16 PM
Subject: Re: [TekScopes] Machinable Potting Material ???
JB weld works well for this.
Mike kd5rjz
On Sat, Aug 18, 2018 at 4:55 PM, Paul Koretko <hglent@...> wrote:
Greetings,
I'm trying to save a couple old plastic knobs that have stripped set
screw
threads, that don't have brass inserts. I remember reading someplace
about
a machinable potting material that is easily flowed into a mold. I've
tried JB Weld, but it doesn't flow well. It has a tendency to leave
void
areas. I want to drill a new set screw hole and hand tap it for 4-40
set
screw.
I remember seeing some discussion on potting material on one of the
groups
I read, so I'm asking for help. Any advice will be appreciated. I
will
also post this to some of the other groups I read.
TNX es 73 de WABAG ..
Paul K.
|
Re: Tektronix 465,NO Trigger
Hello John,
I'm glad you made progress in so little time.
On the tekwiki website, down there is a reference material section and a Tektronix semiconductor design catalog.
Link is here:
There you will find the specs of those FETs,
They are selected matched pairs of 2N4416.
Those are out of production but they're not hard to find.
Ideally, you would need to buy a bunch of them and try to find between them, a pair that are similar to each other and are as close as possible to the target specification.
IIRC, those are selected to have Idss between 10 and 15mA, while the plain 2N4416s are anything between 5 and 15mA.
The voltage offset you're getting is due to the only two last FETs you got working are not matched.
The A level triggering center trimpot is able to compensate for up to 200mV so, you' re at the edge of the cliff but still workable.
Still, with the offset so high, they are so unmatched that they will not track well one to another with changes in temperature.
You may be lucky to find the matched ones at Sphere Research, or Qservice (the latter probably better choice for you as they're in Greece)..
Those are two very well known traders of Tek parts, that many in this group can endorse (me included, for Sphere, I never dealt with Qservice).
Good luck,
Rgrds,
Fabio
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On Sat, Aug 18, 2018 at 06:04 PM, Bert Haskins wrote:
On 8/18/2018 3:49 PM, John Stoole wrote:
Hi Bert
No its not the Tunnel Diodes that are faulty its the Trigger driver JFET's have blown, in fact one of them was cracked which I was unable to see until I
removed the Heatsink, so I hope someone can suggest a substitute
Regards
John
|
Re: Machinable Potting Material ???
An alternate approach would be to hand machine delrin rod on a drill press.
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On Sat, Aug 18, 2018 at 6:05 PM, james morton <jrm38510@...> wrote: Warming the JB Weld will decrease the viscosity. I used to pot solid
state modules for the side-winder AIM_9H using Hysol epoxy, it was done in
a vacum chamber, no voids or bubbles allowed.
On Sat, Aug 18, 2018 at 5:21 PM, Richard L. Wurdack <dickw@...>
wrote:
Micromark has some low-temp casting materials <= 160 degrees F. (Metal)
R.
----- Original Message ----- From: "Mike D" <vfd.ninja@...>
To: <[email protected]>
Sent: Saturday, August 18, 2018 4:16 PM
Subject: Re: [TekScopes] Machinable Potting Material ???
JB weld works well for this.
Mike kd5rjz
On Sat, Aug 18, 2018 at 4:55 PM, Paul Koretko <hglent@...> wrote:
Greetings,
I'm trying to save a couple old plastic knobs that have stripped set
screw
threads, that don't have brass inserts. I remember reading someplace
about
a machinable potting material that is easily flowed into a mold. I've
tried JB Weld, but it doesn't flow well. It has a tendency to leave
void
areas. I want to drill a new set screw hole and hand tap it for 4-40
set
screw.
I remember seeing some discussion on potting material on one of the
groups
I read, so I'm asking for help. Any advice will be appreciated. I will
also post this to some of the other groups I read.
TNX es 73 de WABAG ..
Paul K.
|
Re: Machinable Potting Material ???
Warming the JB Weld will decrease the viscosity. I used to pot solid state modules for the side-winder AIM_9H using Hysol epoxy, it was done in a vacum chamber, no voids or bubbles allowed. On Sat, Aug 18, 2018 at 5:21 PM, Richard L. Wurdack <dickw@...> wrote: Micromark has some low-temp casting materials <= 160 degrees F. (Metal)
R.
----- Original Message ----- From: "Mike D" <vfd.ninja@...>
To: <[email protected]>
Sent: Saturday, August 18, 2018 4:16 PM
Subject: Re: [TekScopes] Machinable Potting Material ???
JB weld works well for this.
Mike kd5rjz
On Sat, Aug 18, 2018 at 4:55 PM, Paul Koretko <hglent@...> wrote:
Greetings,
I'm trying to save a couple old plastic knobs that have stripped set
screw
threads, that don't have brass inserts. I remember reading someplace
about
a machinable potting material that is easily flowed into a mold. I've
tried JB Weld, but it doesn't flow well. It has a tendency to leave void
areas. I want to drill a new set screw hole and hand tap it for 4-40 set
screw.
I remember seeing some discussion on potting material on one of the
groups
I read, so I'm asking for help. Any advice will be appreciated. I will
also post this to some of the other groups I read.
TNX es 73 de WABAG ..
Paul K.
|
Re: TEK 466 Analog Storage
On 2018-08-18 4:16 PM, Paul B. via Groups.Io wrote: Thanks, but that link you provided only seems to point to an extremely high resolution scan of the front cover of the manual (69Mb's worth!) unless there's something I'm doing wrong! It's a multipage TIFF -- most system previewers (Windows, OS X) can page through it. Sorry, I should have warned about that :-) --Toby But no worries, I found another manual/service book quite easily elsewhere and will study that. In the mean time, if anyone knows what the screen should appear like at switch-on (which doesn't seem to be covered in the manual i downloaded) please feel free to chip in here with a description; thanks!
|
Re: Machinable Potting Material ???
Micromark has some low-temp casting materials <= 160 degrees F. (Metal)
R.
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----- Original Message ----- From: "Mike D" <vfd.ninja@...> To: < [email protected]> Sent: Saturday, August 18, 2018 4:16 PM Subject: Re: [TekScopes] Machinable Potting Material ??? JB weld works well for this.
Mike kd5rjz
On Sat, Aug 18, 2018 at 4:55 PM, Paul Koretko <hglent@...> wrote:
Greetings,
I'm trying to save a couple old plastic knobs that have stripped set screw
threads, that don't have brass inserts. I remember reading someplace about
a machinable potting material that is easily flowed into a mold. I've
tried JB Weld, but it doesn't flow well. It has a tendency to leave void
areas. I want to drill a new set screw hole and hand tap it for 4-40 set
screw.
I remember seeing some discussion on potting material on one of the groups
I read, so I'm asking for help. Any advice will be appreciated. I will
also post this to some of the other groups I read.
TNX es 73 de WABAG ..
Paul K.
|
Re: Machinable Potting Material ???
Is the knob large enough to use a 6-32 set screw? If so make sure you use a correct numbered drill with the tap.
73,
Blll, WA2DVU
Cape Mah
toggle quoted message
Show quoted text
-----Original Message----- From: [email protected] < [email protected]> On Behalf Of Paul Koretko Sent: Saturday, August 18, 2018 5:55 PM To: [email protected]Subject: [TekScopes] Machinable Potting Material ??? Greetings, I'm trying to save a couple old plastic knobs that have stripped set screw threads, that don't have brass inserts. I remember reading someplace about a machinable potting material that is easily flowed into a mold. I've tried JB Weld, but it doesn't flow well. It has a tendency to leave void areas. I want to drill a new set screw hole and hand tap it for 4-40 set screw. I remember seeing some discussion on potting material on one of the groups I read, so I'm asking for help. Any advice will be appreciated. I will also post this to some of the other groups I read. TNX es 73 de WABAG .. Paul K.
|
Re: Machinable Potting Material ???
JB weld works well for this.
Mike kd5rjz
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On Sat, Aug 18, 2018 at 4:55 PM, Paul Koretko <hglent@...> wrote: Greetings,
I'm trying to save a couple old plastic knobs that have stripped set screw
threads, that don't have brass inserts. I remember reading someplace about
a machinable potting material that is easily flowed into a mold. I've
tried JB Weld, but it doesn't flow well. It has a tendency to leave void
areas. I want to drill a new set screw hole and hand tap it for 4-40 set
screw.
I remember seeing some discussion on potting material on one of the groups
I read, so I'm asking for help. Any advice will be appreciated. I will
also post this to some of the other groups I read.
TNX es 73 de WABAG ..
Paul K.
|
Re: TEK 466 Analog Storage
Just what I was looking for; many thanks.
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Re: Tek 2467b test 05 error
On Fri, 17 Aug 2018 at 23:01 <Sscandizzo@...> wrote: I'm definitely new to scope repair. But old hand at other electronics repair? The 2467 could not be passed up but it did come with the faults when I
purchased it. I do have an inexpensive digital scope that I hope I can use
to bring this one back to life. Excellent - for the most part you don't need a whole lot'o'scope to diagnose another scope. The power supply ripple is typically measured under the 20MHz bandwidth limiter, and the digital & control signalling on this scope is mostly below 1MHz. The only other instrument you need is a decent DMM (or the like). I'll need a quiet afternoon to open it up. I will check the points you
have mentioned and post my results.
Looking forward to it - good hunting!
|
Mike D
Fabio Trevisan
Bill Riches