Date   

Gmail Problems

 

Apparently Gmail is having serious problems.
Groups.io is bouncing email to some members who have Gmail addresses because
Gmail is rejecting mail directed to its members.
Dennis Tillman W7pF


Re: Finding good homes for older Tektronix equipment (547, plugins, 454A)

 

Hi Jeff,
Several TekScopes members are interested in your offer but emails are bouncing from the email address you included in your post.
Please provide an alternate email address or phone number our members can use to contact you directly.
Dennis Tillman W7pF

-----Original Message-----
From: TekScopes@groups.io [mailto:TekScopes@groups.io] On Behalf Of Dave Peterson via groups.io
Sent: Sunday, December 13, 2020 12:41 PM
To: TekScopes@groups.io
Subject: Re: [TekScopes] Finding good homes for older Tektronix equipment (547, plugins, 454A)

Hi Jeff,
I'm in San Francisco and have been bitten by the TekScope bug. My current focus is 465 Scopes, but can see my horizon's broadening. What do you have?
Dave
On Sunday, December 13, 2020, 12:17:15 PM PST, <nelsonjef@gmail.com> wrote:

I have a handful of older Tek scopes and plugins that I would like to find good homes for. Can someone point me to the appropriate place to post descriptions, please? (Hopefully not ebay.) I'm located in the SF bay area (Santa Rosa). Thanks, Jeff












--
Dennis Tillman W7pF
TekScopes Moderator


Re: Looking for accessories for 2400 series scopes.

Jim Ford
 

I thought that was the infamous Alex S.!   Jim Ford Sent from my Verizon, Samsung Galaxy smartphone

-------- Original message --------From: Chuck Harris <cfharris@erols.com> Date: 12/17/20 7:04 AM (GMT-08:00) To: TekScopes@groups.io Subject: Re: [TekScopes] Looking for accessories for 2400 series scopes. Alex S. is also a supplier of faked 2465B scopes.  He hastaken 2445B scopes, and modified them to appear to be2465B scopes for many, many years.  He has admitted tosuch fraud in emails to me, and to many, many others.One of my customers recently bought a trigger hybridfrom him that was supposedly tested and good, but itwasn't.  A replacement from Q-Service put the scoperight.   Thanks Dinos!Feel free to buy from whomever you want, but I wouldnever buy anything from Alex S.-Chuck HarrisRichard Steedman wrote:> Alexander Schonfeld, who runs "Oscilloscopes Etc", is a good source of 2400 series stuff.  I bought an accessories pouch from him.> You can find his contact details quite easliy on Google.> > > > > >


Re: WTB: 3B4 plug in for RTTY

greenboxmaven
 

I want to be able to display other signals as well as the common RTTY X-Y tuning indication without needing to exchange the modules.

Bruce Gentry, KA2IVY

On 12/17/20 12:38, widgethunter via groups.io wrote:
why not use another vertical plug-in for external hor input?
-----Original Message-----
From: greenboxmaven via groups.io <ka2ivy=verizon.net@groups.io>
To: TekScopes@groups.io
Sent: Wed, Dec 16, 2020 8:37 pm
Subject: [TekScopes] WTB: 3B4 plug in for RTTY

I am going to use the 561B rack mount scope I have restored in an RTTY
setup. The time base I have does not offer an external horizontal
input. A 3B4 or perhaps 3T4 does have it. Does anyone have one to spare?
Thanks,

Bruce Gentry, KA2IVY











Re: WTB: 3B4 plug in for RTTY

widgethunter
 

why not use another vertical plug-in for external hor input?

-----Original Message-----
From: greenboxmaven via groups.io <ka2ivy=verizon.net@groups.io>
To: TekScopes@groups.io
Sent: Wed, Dec 16, 2020 8:37 pm
Subject: [TekScopes] WTB: 3B4 plug in for RTTY

I am going to use the 561B rack mount scope I have restored in an RTTY
setup.  The time base I have does not offer an external horizontal
input. A 3B4 or perhaps 3T4 does have it. Does anyone have one to spare?
Thanks,

Bruce Gentry, KA2IVY


Re: Alcohol (was: Re: [TekScopes] Remove adhesive from old Tek aluminium cabinet covers)

Chuck Harris <cfharris@...>
 

The ORM-D regulations are enforced by USDOT, not the shipper.

Interstate Amazon shippers have to comply with USDOT regulations.

Intrastate, not so much... though they do have to comply with
the state's DOT regulations.

-Chuck Harris

Shirley Dulcey KE1L wrote:

Amazon is likely to be using its own shipping for orders of alcohol
whenever possible. No idea whether their drivers are giving the stuff
proper respect.

On Thu, Dec 17, 2020 at 9:55 AM Chuck Harris <cfharris@erols.com> wrote:

None of us understand the supply shortages COVID caused
completely.

I used to be able to get 16 oz of 99% IPA from Safeway for
$2 and change. Now I can't.

I used to be able to get 64 oz of 99% IPA from Costco for
$7 and change. Now I can't.

Buying from Amazon should incur a hazardous materials (ORM-D)
shipping premium. If it doesn't, the shipper is cheating,
and a nice fire could render everyone involved poorer.

Buying from DigiKey will incur a shipping and ORM-D charge
that costs more than the IPA.

Sad about Mark Electronics... I liked the Liz and Scott...
but the business model was always sketchy.

-Chuck Harris

Jeff Dutky wrote:
I don't understand why people are having trouble obtaining isopropyl
alcohol. If I just search on Amazon for "99.9 Isopropyl" I get plenty of
hits. The only problem I see is that they all seem to be packaged in
plastic containers: I was hoping to get a steel bottle like my current can
of (probably well below 99.9% due to age) IPA from GC Electronics (they
still seem to be a going concern, but Amazon does not list IPA from them).

I'm sure that I bought this can of IPA from a local electronics supply
store (Marc Electronics in Beltsville MD, no longer in business). I'm
pretty sure that the can is at least 15 years old, but it may be two or
three times that old. The date code is not legible, but the price, for 16
fl. oz. is $5.52, which seems low even for 2005.














Re: Alcohol (was: Re: [TekScopes] Remove adhesive from old Tek aluminium cabinet covers)

stevenhorii
 

From what I saw of shortages as COVID-19 turned from an epidemic to a
pandemic was a near-immediate sell out of rubbing alcohol in pharmacies and
supermarkets (at least the local ones I go to, but they are part of
national chains) as well as hand sanitizer, sanitizing wipes, Lysol and
other disinfecting sprays, and the more newsworthy shortages of toilet
paper and paper towels (oh, and milk, eggs, and bread). I think people were
looking for 99% IPA because there were plenty of Web sites that tell you
how to make your own hand sanitizer, but the final alcohol percentage
should be at least 70-75% according to the CDC so starting with 70% IPA and
adding stuff like aloe vera gel and some fragrance will dilute it too much.
My colleagues and I joked about buying a high-proof vodka if you didn't
mind the cost. You could then drink what you didn't use to make hand
sanitizer. There's a Vodka called Spirytus that is 192 proof or 96% ethanol
(we looked it up to see if you could actually do this).

On Thu, Dec 17, 2020 at 10:44 AM Jeff Dutky <jeff.dutky@gmail.com> wrote:

Many of the COVID-caused supply shortages are just demand shocks:
just-in-time manufacturing and delivery is very good if the demand is
predictable, but when demand doubles or triples (as happened, for example,
with toilet paper) it can take quite a while for supply to readjust. I
suspect, however, that another factor in the ongoing shortages is that many
manufacturing operations have very little excess labor capacity, and that
only a few people out sick is enough to bring entire operations to a halt.
It's one thing if you have to cover for one person out sick for a week or
two, but when 10% of your staff is out for two weeks you probably don't
have enough cross-trained people to cover all positions. Now multiply that
across dozens of companies involved in any supply chain and you get massive
shortages of all kinds of things, even things that are not directly being
demanded by the crisis.

None of this is to say that I completely understand the supply shortages
caused by COVID, I just think it's a fascinating example of how complex
systems can fail under unexpected conditions.

-- Jeff Dutky






Re: WTB: 3B4 plug in for RTTY

ChuckA
 

Bruce & Mike

I may have a solution for you guys. I can have the scope and plug-ins picked up from Mike in VA and I will ship the 3B4 plug-in to Bruce for the cost of shipping.

Contact me off list if you want to go with it.

Chuck

On 12/17/2020 5:59 AM, Mike Dinolfo wrote:
Bruce:

I have a 3B4 timebase.  Only problem is that I don't want to ship.  From
looking at the FCC call sign database, I think you are in NY state,
yes?  Do you ever get down to the Washington DC area?  If you do, you
are welcome to the 3B4.  The 3B4 comes with a rackmount 561A scope, and
a 3A74 quad vertical amplifier, and a 2A61 differential vertical
amplfier. It's all yours- scope and plugins- for free, provided that you
pick up everything.  All items are uncalibrated, but in good working
condition.  I do seem to remember that there's a non-Tek knob on one of
the 3A74 amplifier's controls, but it doesn't affect operation.

I live in Fairfax VA, about 5 miles outside of the Washington DC beltway.

Mike Dinolfo N4MWP

On 12/16/20 11:37 PM, greenboxmaven via groups.io wrote:
I am going to use the 561B rack mount scope I have restored in an RTTY
setup.  The time base I have does not offer an external horizontal
input. A 3B4 or perhaps 3T4 does have it. Does anyone have one to
spare? Thanks,

Bruce Gentry, KA2IVY










--
See Early TV at:

www.myvintagetv.com


Re: Alcohol (was: Re: [TekScopes] Remove adhesive from old Tek aluminium cabinet covers)

 

Many of the COVID-caused supply shortages are just demand shocks: just-in-time manufacturing and delivery is very good if the demand is predictable, but when demand doubles or triples (as happened, for example, with toilet paper) it can take quite a while for supply to readjust. I suspect, however, that another factor in the ongoing shortages is that many manufacturing operations have very little excess labor capacity, and that only a few people out sick is enough to bring entire operations to a halt. It's one thing if you have to cover for one person out sick for a week or two, but when 10% of your staff is out for two weeks you probably don't have enough cross-trained people to cover all positions. Now multiply that across dozens of companies involved in any supply chain and you get massive shortages of all kinds of things, even things that are not directly being demanded by the crisis.

None of this is to say that I completely understand the supply shortages caused by COVID, I just think it's a fascinating example of how complex systems can fail under unexpected conditions.

-- Jeff Dutky


Re: Alcohol (was: Re: [TekScopes] Remove adhesive from old Tek aluminium cabinet covers)

Shirley Dulcey KE1L
 

Amazon is likely to be using its own shipping for orders of alcohol
whenever possible. No idea whether their drivers are giving the stuff
proper respect.

On Thu, Dec 17, 2020 at 9:55 AM Chuck Harris <cfharris@erols.com> wrote:

None of us understand the supply shortages COVID caused
completely.

I used to be able to get 16 oz of 99% IPA from Safeway for
$2 and change. Now I can't.

I used to be able to get 64 oz of 99% IPA from Costco for
$7 and change. Now I can't.

Buying from Amazon should incur a hazardous materials (ORM-D)
shipping premium. If it doesn't, the shipper is cheating,
and a nice fire could render everyone involved poorer.

Buying from DigiKey will incur a shipping and ORM-D charge
that costs more than the IPA.

Sad about Mark Electronics... I liked the Liz and Scott...
but the business model was always sketchy.

-Chuck Harris

Jeff Dutky wrote:
I don't understand why people are having trouble obtaining isopropyl
alcohol. If I just search on Amazon for "99.9 Isopropyl" I get plenty of
hits. The only problem I see is that they all seem to be packaged in
plastic containers: I was hoping to get a steel bottle like my current can
of (probably well below 99.9% due to age) IPA from GC Electronics (they
still seem to be a going concern, but Amazon does not list IPA from them).

I'm sure that I bought this can of IPA from a local electronics supply
store (Marc Electronics in Beltsville MD, no longer in business). I'm
pretty sure that the can is at least 15 years old, but it may be two or
three times that old. The date code is not legible, but the price, for 16
fl. oz. is $5.52, which seems low even for 2005.










Re: Looking for accessories for 2400 series scopes.

Chuck Harris <cfharris@...>
 

Alex S. is also a supplier of faked 2465B scopes. He has
taken 2445B scopes, and modified them to appear to be
2465B scopes for many, many years. He has admitted to
such fraud in emails to me, and to many, many others.

One of my customers recently bought a trigger hybrid
from him that was supposedly tested and good, but it
wasn't. A replacement from Q-Service put the scope
right. Thanks Dinos!

Feel free to buy from whomever you want, but I would
never buy anything from Alex S.

-Chuck Harris

Richard Steedman wrote:

Alexander Schonfeld, who runs "Oscilloscopes Etc", is a good source of 2400 series stuff. I bought an accessories pouch from him.
You can find his contact details quite easliy on Google.






Re: Unable to display cursors and diagnostic messages after LPVS "recapping"

Chuck Harris <cfharris@...>
 

Since the failure happened after he recapped the power supply,
I think the problem is almost 100% certainly a result of that
job.

Most likely, it is a cabling issue, as it is easy to forget
one, or to put one in the wrong place... usually with dire
results.

-Chuck Harris

Siggi wrote:

On Wed, Dec 16, 2020 at 8:09 AM Rogerio O <rodd414@gmail.com> wrote:

when I powered up the scope I could see the error message PUSH A/B
TRIGGER once.
And this is a reasonable intensity?


After pushing this button the message display vanished, and it is
impossible to display any message no matter what is the position of the
READOT INTENSITY control.
I would suspect the intensity pot, or the MUX in the potentiometer
readback. The pot itself is easy enough to test, just find the pot signal
ahead of the MUX on the A5 board and see whether it tracks with the pot as
you move it.

I noticed also that it is not possible to display the cursors.
The cursors and the OSD are generated from the same machinery, and they
share the same intensity setting.






Re: Alcohol (was: Re: [TekScopes] Remove adhesive from old Tek aluminium cabinet covers)

Chuck Harris <cfharris@...>
 

None of us understand the supply shortages COVID caused
completely.

I used to be able to get 16 oz of 99% IPA from Safeway for
$2 and change. Now I can't.

I used to be able to get 64 oz of 99% IPA from Costco for
$7 and change. Now I can't.

Buying from Amazon should incur a hazardous materials (ORM-D)
shipping premium. If it doesn't, the shipper is cheating,
and a nice fire could render everyone involved poorer.

Buying from DigiKey will incur a shipping and ORM-D charge
that costs more than the IPA.

Sad about Mark Electronics... I liked the Liz and Scott...
but the business model was always sketchy.

-Chuck Harris

Jeff Dutky wrote:

I don't understand why people are having trouble obtaining isopropyl alcohol. If I just search on Amazon for "99.9 Isopropyl" I get plenty of hits. The only problem I see is that they all seem to be packaged in plastic containers: I was hoping to get a steel bottle like my current can of (probably well below 99.9% due to age) IPA from GC Electronics (they still seem to be a going concern, but Amazon does not list IPA from them).

I'm sure that I bought this can of IPA from a local electronics supply store (Marc Electronics in Beltsville MD, no longer in business). I'm pretty sure that the can is at least 15 years old, but it may be two or three times that old. The date code is not legible, but the price, for 16 fl. oz. is $5.52, which seems low even for 2005.






Re: Remove adhesive from old Tek aluminium cabinet covers

Carsten Bormann
 

On 2020-12-17, at 14:00, Colin Herbert via groups.io <colingherbert=blueyonder.co.uk@groups.io> wrote:

4% ethyl alcohol in water
Americans call that “a beer” (Miller, Coors, …).
(In Germany, beer has to fulfill some additional requirements.)

Grüße, Carsten


Re: (OT) Where to go for 70s IBM hardware? I'm looking for a terminal.

 

Hi all,
Any protocol, twinax or coax are fine too. They're being picked apart
by keyboard fans so I hope to document those things before they get
all picked apart, and hopefully provide alternatives. Some kinds of
terminals are on collector shortlists, mostly because of the keyboard
switches they use, so I hope to document those to a state where they
can be recreated. The keyboard fans are actually pretty good with
this, they recreate old technologies, including injection molding and
other manufacturing techniques. My hope is that by providing this sort
of information, and helping them to figure how to make those things,
they'll lay off the actual historical systems and it'll help those
things survive without having their keyboards unceremoniously cut off
with side cutters. The kinds that I am mostly looking for are older
60s-70s IBM terminals, as they're the ones being picked apart most
fervently.

Best regards

On Mon, Dec 14, 2020 at 11:35 PM <jsantoro54@gmail.com> wrote:

Are you looking for twinax or coax terminals?





Re: Remove adhesive from old Tek aluminium cabinet covers

Colin Herbert
 

I am pretty sure that 4% ethyl alcohol in water was one of the things used to sanitise benches in microbiology labs at Imperial College, London. Of course, I retired about four years ago and my memory may be a bit hazy, but I certainly recall that concentration of ethyl alcohol being pretty much like that of beer. I used to joke that we drinkers should have pathogen-free guts. Don't forget the mechanism that the sanitiser uses to get inside the pathogen (the water is needed to get through the surface of the pathogen) and the dose-rate with regard to body-mass index against whatever is used to describe microbes/viruses.
Colin.

-----Original Message-----
From: TekScopes@groups.io [mailto:TekScopes@groups.io] On Behalf Of Roy Thistle
Sent: 16 December 2020 23:32
To: TekScopes@groups.io
Subject: Re: [TekScopes] Remove adhesive from old Tek aluminium cabinet covers

On Tue, Dec 15, 2020 at 06:36 AM, Colin Herbert wrote:


4% solution of ethyl alcohol in water
That might intoxicate pathogens... and cause them to commit foolish acts leading to their demise; but in of itself, it won't "kill" them.


Re: Looking for accessories for 2400 series scopes.

Richard Steedman
 

Alexander Schonfeld, who runs "Oscilloscopes Etc", is a good source of 2400 series stuff. I bought an accessories pouch from him. You can find his contact details quite easliy on Google.


Re: Looking for accessories for 2400 series scopes.

Lawrance A. Schneider
 

I have cover 200-3199-00 . I think it came off a 2445(?) - I think B.

I also have the pouch in question.

I've offer both to Mr. Cabot, but have received no reply.

If anyone wants them, make an offer.

larry


Re: Unable to display cursors and diagnostic messages after LPVS "recapping"

Siggi
 

On Wed, Dec 16, 2020 at 8:09 AM Rogerio O <rodd414@gmail.com> wrote:

when I powered up the scope I could see the error message PUSH A/B
TRIGGER once.
And this is a reasonable intensity?


After pushing this button the message display vanished, and it is
impossible to display any message no matter what is the position of the
READOT INTENSITY control.
I would suspect the intensity pot, or the MUX in the potentiometer
readback. The pot itself is easy enough to test, just find the pot signal
ahead of the MUX on the A5 board and see whether it tracks with the pot as
you move it.

I noticed also that it is not possible to display the cursors.
The cursors and the OSD are generated from the same machinery, and they
share the same intensity setting.


Re: WTB: 3B4 plug in for RTTY

greenboxmaven
 

Thanks for the offer. At this point, I would rather find the 3B4 alone. I rarely travel to Virginia, and certainly not anywhere until the virus is under control.

Bruce Gentry, KA2IVY, Syracuse, New York

On 12/17/20 5:59, Mike Dinolfo wrote:
Bruce:

I have a 3B4 timebase. Only problem is that I don't want to ship. From
looking at the FCC call sign database, I think you are in NY state,
yes? Do you ever get down to the Washington DC area? If you do, you
are welcome to the 3B4. The 3B4 comes with a rackmount 561A scope, and
a 3A74 quad vertical amplifier, and a 2A61 differential vertical
amplfier. It's all yours- scope and plugins- for free, provided that you
pick up everything. All items are uncalibrated, but in good working
condition. I do seem to remember that there's a non-Tek knob on one of
the 3A74 amplifier's controls, but it doesn't affect operation.

I live in Fairfax VA, about 5 miles outside of the Washington DC beltway.

Mike Dinolfo N4MWP

On 12/16/20 11:37 PM, greenboxmaven via groups.io wrote:
I am going to use the 561B rack mount scope I have restored in an RTTY
setup. The time base I have does not offer an external horizontal
input. A 3B4 or perhaps 3T4 does have it. Does anyone have one to
spare? Thanks,

Bruce Gentry, KA2IVY









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