Date   

Re: Remove adhesive from old Tek aluminium cabinet covers

Stephen
 

I’ve been using turpentine for years on virtually any type of surface, and it works great. It’s non-aggressive, and naturally present in trees. It’s what cobblers have been using to remove or soften the glue.


Re: Remove adhesive from old Tek aluminium cabinet covers

Roger Evans
 

During the discussion of protection against the Covid19 virus it emerged that 90+ percent alcohol is a more effective solvent than lower concentrations. I use 99% IPA so I have never had the chance to observe any differences. What I have found is that glue residue that doesn't respond to IPA often will soften and come off with White Spirit. I haven't noticed any degradation of the paint but as usual you should take care.

Regards,

Roger


Re: Remove adhesive from old Tek aluminium cabinet covers

momemeca
 

Salut Jean-Paul,
I also restore and collect older generation TEK equipment as well as other makes measuring instruments and I use "Citrus Oil" based label remover in a spray on bottle.
Just apply enough, initially, to wet the label and let it soak for a period of time until you can push the edge of the label with your fingernail.
At this point I peel the upper layer of the label and apply another small amount to soak the next layer.
Eventually the old adhesive will be dissolved without this "limonene" based solvent ever damaging the paintwork.
One big warning however: Citrus-based solvents, when exposed to some plastics, will cause softening of those plastics. Therefore, wipe any overspray immediately with clean water and wipe dry. I usually mask off any plastic bits if they are too close.
Finish off your label removal by cleaning area with "Spray n' Wipe" or something similar.

A la prochaine,

Frédéric :-)

On 12 Dec 2020, at 21:30, Jean-Paul <jonpaul@ix.netcom.com> wrote:

Bonjour,

I Am Restoring 1960-1970s Tek equipment with blue aluminum cabinet covers, stored for decades with wide tape, which left yellow adhesive over wide areas.

So, isopropyl alcohol 70%...does not remove the adhesive well. It spreads it around and needs a lot of force.
And petroleum distilates like "Goo Gone" work but affect the blue finish.

What are the best solvents to remove old dried adhesive without damaging the blue finish?

Many thanks

Jon








Re: Remove adhesive from old Tek aluminium cabinet covers

Colin Herbert
 

Maplin sold a Label Remover which was quite effective and contained limonene, so it had a quite pleasant lemony smell. I have also used ethyl acetate to remove self-adhesive labels and dried-on glue. You must, I assume, have tried good old warm, soapy water and elbow grease?
Colin.

-----Original Message-----
From: TekScopes@groups.io [mailto:TekScopes@groups.io] On Behalf Of Jean-Paul
Sent: 12 December 2020 10:31
To: TekScopes@groups.io
Subject: [TekScopes] Remove adhesive from old Tek aluminium cabinet covers

Bonjour,

I Am Restoring 1960-1970s Tek equipment with blue aluminum cabinet covers, stored for decades with wide tape, which left yellow adhesive over wide areas.

So, isopropyl alcohol 70%...does not remove the adhesive well. It spreads it around and needs a lot of force.
And petroleum distilates like "Goo Gone" work but affect the blue finish.

What are the best solvents to remove old dried adhesive without damaging the blue finish?

Many thanks

Jon


Re: Remove adhesive from old Tek aluminium cabinet covers

Ken, WA2LBI
 

Jon,

I've used WD-40 for removing tape residue and goo left from "melting"
plastic feet. Try it on an inconspicuous area (cabinet bottom) first. I
can't recall it damaging any equipment but I do check each item before
working on a visible area.

Ken
WA2LBI

On Sat, Dec 12, 2020 at 5:31 AM Jean-Paul <jonpaul@ix.netcom.com> wrote:

Bonjour,

I Am Restoring 1960-1970s Tek equipment with blue aluminum cabinet
covers, stored for decades with wide tape, which left yellow adhesive over
wide areas.

So, isopropyl alcohol 70%...does not remove the adhesive well. It spreads
it around and needs a lot of force.
And petroleum distilates like "Goo Gone" work but affect the blue finish.

What are the best solvents to remove old dried adhesive without damaging
the blue finish?

Many thanks

Jon



Remove adhesive from old Tek aluminium cabinet covers

Jean-Paul
 

Bonjour,

I Am Restoring 1960-1970s Tek equipment with blue aluminum cabinet covers, stored for decades with wide tape, which left yellow adhesive over wide areas.

So, isopropyl alcohol 70%...does not remove the adhesive well. It spreads it around and needs a lot of force.
And petroleum distilates like "Goo Gone" work but affect the blue finish.

What are the best solvents to remove old dried adhesive without damaging the blue finish?

Many thanks

Jon


Re: 1S1 sampling bridge GaAs diodes: What alternatives?

John Gord
 

Toby,
You are right! And they are not in stock.
--John Gord

On Fri, Dec 11, 2020 at 06:02 PM, <toby@telegraphics.com.au> wrote:


On 2020-12-11 8:06 p.m., John Gord via groups.io wrote:
I think "bulk" here refers to their packaging (they may have a bin full
rather than tape-and-reel). They list a single piece price.
--John Gord
I did not see a single piece price; it informed me that I had to order
in multiples of 676.

Not to say there isn't a different regime under a subtly different part
number.

--Toby

On Fri, Dec 11, 2020 at 04:51 PM, <toby@telegraphics.com.au> wrote:


On 2020-12-11 6:38 p.m., snapdiode via groups.io wrote:
Hmm, the better-specced DSB2810 is 25% of that price.

https://www.digikey.ca/en/products/detail/microsemi-corporation/DSB2810/4379703?s=N4IgTCBcDaICYGcBGYAcBGADCAugXyA

And another issue with DSB2810 is that at Digikey, at least, they are
only available in bulk quantity (676).

--Toby









Re: 1S1 sampling bridge GaAs diodes: What alternatives?

Tom Lee
 

My Schottky cup runneth over. Thanks for all the diode recommendations!

—Tom

Sent from my iThing, so please forgive typos and brevity.

On Dec 11, 2020, at 6:11 PM, snapdiode via groups.io <snapdiode=yahoo.com@groups.io> wrote:

Asking D-K will usually let you split up a bulk pack. At least they used to when I called from work and they saw all the ordering we did.

How about the BAT81? It has a cooler name too. And it's 50 cents.





Re: 130 LC meter

Dave Brown
 

An individual in Australia did a great restoration which was published in Silicon Chip magazine. The museum received rights to publish the articles. It's worth a read.
https://vintagetek.org/130-lc-meter-restoration/


Sampling bridge and Schottky diode info

snapdiode
 


Re: 1S1 sampling bridge GaAs diodes: What alternatives?

snapdiode
 

Asking D-K will usually let you split up a bulk pack. At least they used to when I called from work and they saw all the ordering we did.

How about the BAT81? It has a cooler name too. And it's 50 cents.


Re: 1S1 sampling bridge GaAs diodes: What alternatives?

toby@...
 

On 2020-12-11 8:06 p.m., John Gord via groups.io wrote:
I think "bulk" here refers to their packaging (they may have a bin full rather than tape-and-reel). They list a single piece price.
--John Gord
I did not see a single piece price; it informed me that I had to order
in multiples of 676.

Not to say there isn't a different regime under a subtly different part
number.

--Toby

On Fri, Dec 11, 2020 at 04:51 PM, <toby@telegraphics.com.au> wrote:


On 2020-12-11 6:38 p.m., snapdiode via groups.io wrote:
Hmm, the better-specced DSB2810 is 25% of that price.

https://www.digikey.ca/en/products/detail/microsemi-corporation/DSB2810/4379703?s=N4IgTCBcDaICYGcBGYAcBGADCAugXyA

And another issue with DSB2810 is that at Digikey, at least, they are
only available in bulk quantity (676).

--Toby









Re: 1S1 sampling bridge GaAs diodes: What alternatives?

snapdiode
 

One thing that springs to mind is the four diodes are not identical in the bridge. The two facing the input are physically a bit smaller and have a yellow dot painted on, and diodes facing the memory circuit are bigger and have an orange dot. Who knows what that means...


Re: Greetings From a New Member

Gordon Smith
 

On Tue, Dec 8, 2020 at 09:40 PM, Dave Seiter wrote:

The 502 was my first Tek scope too, and also the reason for joining the
group!  I got great advice on fixing it, but got sidetracked by two pallets
of other Tek scopes soon thereafter...  One of these days I hope to get back
to the 502.
-Dave
Hi Dave,
Boss gave me the 502. It's a VERY early model (Serial #565), appears to be all original (Black Beauty caps and all) and in good shape except for an ugly repaint job on the case. I've replaced the cooling fan shock mounts already and hope to get to it in the next couple of months.
Gordon


Re: 1S1 sampling bridge GaAs diodes: What alternatives?

John Gord
 

I think "bulk" here refers to their packaging (they may have a bin full rather than tape-and-reel). They list a single piece price.
--John Gord

On Fri, Dec 11, 2020 at 04:51 PM, <toby@telegraphics.com.au> wrote:


On 2020-12-11 6:38 p.m., snapdiode via groups.io wrote:
Hmm, the better-specced DSB2810 is 25% of that price.

https://www.digikey.ca/en/products/detail/microsemi-corporation/DSB2810/4379703?s=N4IgTCBcDaICYGcBGYAcBGADCAugXyA

And another issue with DSB2810 is that at Digikey, at least, they are
only available in bulk quantity (676).

--Toby






Re: 130 LC meter

SCMenasian
 

When I get to checking it out with the analog meter, I'll see how far off things end up. I did make provisions for compensation of non-linear effects, if necessary; but I hope I don't have to use them.


Re: 130 LC meter

SCMenasian
 

Dave,

Yes, that was a prime motivator for my project. When I fired the 130 up at first, I noted a significant DC voltage at the guard terminal - indicating that the C110 was bad. I, then, noted that the same kind of capacitor was used throughout and decided that a restoration of the vacuum tube circuitry was not the way to go.

Stephen


Re: 1S1 sampling bridge GaAs diodes: What alternatives?

toby@...
 

On 2020-12-11 6:38 p.m., snapdiode via groups.io wrote:
Hmm, the better-specced DSB2810 is 25% of that price.

https://www.digikey.ca/en/products/detail/microsemi-corporation/DSB2810/4379703?s=N4IgTCBcDaICYGcBGYAcBGADCAugXyA

And another issue with DSB2810 is that at Digikey, at least, they are
only available in bulk quantity (676).

--Toby






IMPORTANT: Regarding your Peter Keller Book Order

 

Please DO NOT email me if you find your name on either the domestic or
International list for Peter Keller's book UNLESS there is an error or you
have paid me and you cannot find you payment.
I do not want people to send me an email confirming they found their
initials and the amount seemed correct. I am drowning in unnecessary emails.
Dennis Tillman W7pF


Re: 1S1 sampling bridge GaAs diodes: What alternatives?

toby@...
 

On 2020-12-11 6:38 p.m., snapdiode via groups.io wrote:
Hmm, the better-specced DSB2810 is 25% of that price.

https://www.digikey.ca/en/products/detail/microsemi-corporation/DSB2810/4379703?s=N4IgTCBcDaICYGcBGYAcBGADCAugXyA
Noting the 20V breakdown voltage versus 70V, and lower working reverse
voltage, if that's relevant.

--Toby





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