Date   

Re: WTB: 3B4 plug in for RTTY

greenboxmaven
 

On 12/17/20 0:22, Roy Morgan wrote:
Do you have any other amplifier plug-in??

You can plug any amplifier module into the right hand slot and have a X-Y scope (I am very sure from years-ago memory).

My 561/554 and plug-in's are in storage I cannot get to.

Roy Morgan
K1LKY Western Mass

On Dec 16, 2020, at 11:37 PM, greenboxmaven via groups.io <ka2ivy=verizon.net@groups.io> wrote:



Re: WTB: 3B4 plug in for RTTY

 

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





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

stevenhorii
 

I purchased 99% isopropyl alcohol from Alliance Chemical (
Alliance@alliancechemical.com). I bought two gallons. Each gallon is packed
in 1-quart plastic bottles with a foil seal under the cap. This likely will
not stop some water absorption, but it is better than not having a foil
seal. I think they use plastic bottles because of the fragility of glass
and the lighter weight. As it is, the shipping cost was high but it is a
flammable liquid, so the package goes by ground service and I suspect there
is a surcharge for flammable liquids, though I am not sure whether or not
the carriers consider flash point or self-ignition temperature when
classifying flammables. At any rate, if you search Amazon for
"Ispropyl alcohol 99% technical grade" and search under "Industrial and
Scientific" a number of vendors come up and almost all showed "in stock".
If I just searched "isopropyl alcohol" under the usual "Health, household
and baby care" most of the dealers that showed up sold the 1 quart/liter
bottles only (though you could always purchase multiples) and many were out
of stock. Most also only listed 70% isopropyl alcohol. This was back in
April, so there was likely a lot of panic buying going on. I have noticed
that as of late last month, the pharmacy I go to had "rubbing alcohol" on
the shelves again - which is almost always 70% isopropyl, though
surprisingly, they used to sell 70% ethyl alcohol as rubbing alcohol as
well - no tax seal, so I don't know how they denatured it; it was not
labeled "denatured" and the ingredients did not say what the denaturing
agent was. I was looking to be sure it was not methyl alcohol as a
denaturant.

I have no financial interest in Alliance Chemical.

Steve Horii

On Thu, Dec 17, 2020 at 1:21 AM Jeff Dutky <jeff.dutky@gmail.com> 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)

Shirley Dulcey KE1L
 

Isopropyl alcohol has been scarce in drugstores since the pandemic started;
it's in demand as a hand sanitizer. The CVS near me has had it for the past
month (it's featured in the display of COVID-related products near the
door), but before that it was unavailable there.

There are plenty of hits on Amazon NOW, though mostly from brands nobody
has ever heard of so some of us are suspicious of their provenance. A few
months ago, not so much.

On Thu, Dec 17, 2020 at 1:21 AM Jeff Dutky <jeff.dutky@gmail.com> 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)

 

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: WTB: 3B4 plug in for RTTY

Roy Morgan
 

Do you have any other amplifier plug-in??

You can plug any amplifier module into the right hand slot and have a X-Y scope (I am very sure from years-ago memory).

My 561/554 and plug-in's are in storage I cannot get to.

Roy Morgan
K1LKY Western Mass

On Dec 16, 2020, at 11:37 PM, greenboxmaven via groups.io <ka2ivy=verizon.net@groups.io> wrote:


WTB: 3B4 plug in for RTTY

greenboxmaven
 

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: Looking for accessories for 2400 series scopes.

Craig Cramb
 

Jared,

I should be able to get these for you. Let me know what is appropriate for you.

Craig

On Dec 16, 2020, at 5:43 PM, Jared Cabot via groups.io <jaredcabot=protonmail.com@groups.io> wrote:

Ah, good point on the scope type I have.
I'm specifically looking for parts for a 2467B.

I have a couple others, but this is my crown jewel that is getting all the attention for now. :)





Re: Looking for accessories for 2400 series scopes.

Jared Cabot
 

Ah, good point on the scope type I have.
I'm specifically looking for parts for a 2467B.

I have a couple others, but this is my crown jewel that is getting all the attention for now. :)


Re: Remove adhesive from old Tek aluminium cabinet covers

Roy Thistle
 

On Wed, Dec 16, 2020 at 01:01 PM, Randy.AB9GO wrote:


If someone would like to research the MSD
platen cleaner has been discussed on TekScopes before. I agree with your observations. Not sure the original formulation(s)/products had MSDS(s)... since that was not a requirement back then.


Re: Remove adhesive from old Tek aluminium cabinet covers

Roy Thistle
 

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.

DaveH52
 

I'd also like to find a front cover and pouch for my 2465 (no dmm)


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

Roy Thistle
 

On Wed, Dec 16, 2020 at 11:42 AM, Brad Thompson wrote:


they don't offer over-the-counter sales
Their selling to companies making bio-diesel, or bio-based heating "oil" ... they're selling the stuff needed to make, process, and test.
If they will sell to people... probably you'd need an account with them... and you'd probably have to be a user/maker of bio-fuel... and some farmers might be doing that... or truckers too.
If you're just looking for a litre of isopropanol, to swab your 465b, it seems like the fastest way to get on a "watch list" to me.


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

Roy Thistle
 

On Wed, Dec 16, 2020 at 11:42 AM, Brad Thompson wrote:


190-proof
that's about 95% (compared to 99.9% or 99%)... but, unless you handle the 99 stuff carefully... and have a large volume of it... it soon will go towards 95% anyway. (If anyone is interested in how to keep it at as high a concentration as possible... I can make suggestions... but, I'm not sure we are supposed to be discussing "alcohol" on TekScopes?)


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

Craig Cramb
 

I would suggest that you disassemble it again remove the option rack and boot the scope without the option rack assembly. Yes you will see option errors but see what you get then is a good starting point. The options rack assembly alignment and getting everything plugged back in correctly can be problem. Leave cover off when you do this test but run a fan across the main board hybrids to prevent overheating.

Craig


Re: Remove adhesive from old Tek aluminium cabinet covers

Randy.AB9GO
 

What I used to use back in the day (20 years ago) was from Texwipe and it was called Platen cleaner and rejuvenator. It never hurt anything I applied it to. What I ended up using it for was removing labels from barcode thermal printheads and rollers. From there I started using it for removing adhesive labels from darn near anything. It never hurt paint, plastic or rubber. You would spray it on a label wait 30 seconds and it would come off cleanly in one piece without any scraping. A little more on a cotton ball and any left over goo would come off with no effort. I still have one can left and from what I remember it was a 4 oz can. It was a little pricey but it worked so well and saved so many expensive thermal printheads it was well worth it.

The stuff had a smell that screamed cancer! Texwipe sells a replacement product that unfortunately is just like all the other citrus-based crap out there that kinda works. The original product is no longer available. If someone would like to research the MSD it may be possible to find out what the miracle active ingredient is and possibly mix up a batch. As I said this was the perfect stuff. I've never seen anything that would touch it. It had the power of acetone without the damage.

Randy AB9GO.

This message sent to you from my mobile device via speech-to-text technology.


Photo Notifications #photo-notice

TekScopes@groups.io Notification <noreply@...>
 

Rogerio O added the album Tek 2465BCT unable do display cursors and readout messages: After LPVS recapping, the scope was unable do display the cursors or diagnostic messages. All volatages on J-119 and A5 DAC Ref on spot Impossible to start calibration until this error is corrected


The following photos have been uploaded to the Tek 2465BCT unable do display cursors and readout messages album of the TekScopes@groups.io group.

By: Rogerio O


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

Rogerio O
 

After some more testing I found that there is a bright spot near the center of the screen at almost every position of the READOUT INTENSITY control knob.
If I move it slowly, a figure like a rectangle appears when the knob is about the center position.
I have uploaded a photo (https://groups.io/g/TekScopes/album?id=258165)


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

greenboxmaven
 

Isopropyl alcohol also works well to remove the vile residue left when polyurethane belts or foam decompose. It is also very good for cleaning magnetic tape heads. Heet brand (and probably others too) fuel line antifreeze is also available in isopropyl formulation at auto supply stores. It would be fine for removing label residue, but don't use it on tape heads, it's not pure enough.

Bruce Gentry, KA2IVY

On 12/16/20 14:42, Brad Thompson wrote:
n4buq wrote on 12/16/2020 11:30 AM:

This place is less than 25 miles from me (easy drive) but they don't offer over-the-counter sales so I haven't made myself pay for shipping; however, the base price is reasonable.

https://www.dudadiesel.com/choose_item.php?id=isoprop

Not affiliated with the company in any way.

Thanks,
Barry - N4BUQ



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

Brad Thompson
 

n4buq wrote on 12/16/2020 11:30 AM:

This place is less than 25 miles from me (easy drive) but they don't offer over-the-counter sales so I haven't made myself pay for shipping; however, the base price is reasonable.

https://www.dudadiesel.com/choose_item.php?id=isoprop

Not affiliated with the company in any way.

Thanks,
Barry - N4BUQ

----- Original Message -----
From: "Chuck Harris" <cfharris@erols.com>
To: TekScopes@groups.io
Sent: Saturday, December 12, 2020 9:14:14 AM
Subject: Re: [TekScopes] Remove adhesive from old Tek aluminium cabinet covers

I used to buy 99% IPA at the local Safeway all the time.

And, yes, it is hygroscopic. If it isn't tightly covered,
it will turn into 91%.

Since COVID, I can't get anything stronger than 70%.

Hello--
Dunno what state-controlled liquor regulations are in force where you live,
you might consider buying some Everclear or other 190-proof grain alcohol
for use as a solvent. Like isopropyl alcohol, grain alcohol is hygroscopic.
I've used it as a rosin-flux cleaner.

For example, the New Hampshire state liquor stores' catalog lists Graves 190-proof "American vodka"
for $14.99 per fifth (750 mL). OTOH, a few years ago I attempted to buy a pint of
grain alcohol in a Vermont state store and  had to fill out a request form. Delivery took
a week, IIRC.

As for using 190-proof as a beverage or punchbowl-spiking agent, I'll leave that to the
frat boys in the small college up the road. It's a dangerous drug, and alcohol poisoning
is no joke.

73--

Brad  AA1IP
**********
Obligatory alcohol-related stale jokes, sources unknown::

"...I don't drink anything stronger than pop (but Pop will drink most anything), and
Uncle Joe (who believed in the  content of any advertisement) saw a billboard
stating "Drink Canada Dry" and we never saw him again...."

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