Date   

Re: Email adresses of group exposed

Tom Gardner
 

Spam is not a problem for me.

I get few spam messages, maybe 15/day, and that hasn't increased recently. With /very/ few exceptions, they end up in /my/ spam folder.

Techniques I use are:

1) turn /off/ all spam filters in my ISP/webmail providers - I want to define what is spam to me, and they often get it wrong. I don't want to have to search their spam boxes to see if they have not sent me an email.

2) gmail is my main email address (e.g. x@...), but for this group it is x+tekscopes@.... I use "+ addressing" whenever possible, to make it easier to see the source of email address "leaks"

3) I use thunderbird/seamonkey to read and store email. Local storage is mbox files, so I can easily swap them to another email program if I feel so inclined.

4) I use thunderbird/seamonkey bayesian spam filters to automatically put spam messages in local folders. I check them once a day to see there are no false positives; I get one every few months. I mark the few false negatives as spam; again I get one every few months.

5) I create thunderbird/seamonkey custom filters to put tekscopes in a different folder, to save cluttering up my inbox. (Currently there are 19k messages in my inbox, ahem :) )

On 19/06/21 16:39, Jean-Paul wrote:
Rebonjour a tous....

A few points please...

1/ The posts exposed cover dates December‎ ‎15‎, ‎2018 up to present.

2/ Google search was done with my email in ".." for exact match

3/ That email has been used for may other sites and some of the usual merchants for 20 years.

4/ Of several email addr, its the only one that's spammed daily, in waves, sometimes 10-25 per day. As they all arrive early in the day or overnight, i suspect China.

5/ I cannot spam filter these effectively, nor easily change that address.

6/ Google is worst, Bing finds some of our posts but less, Duck Duck GOGO found ony a few old datasheets, nothing from our group.

7/ No doubt all other groups.io forums are affected.

8/ Another possible penetration is a spammer joins the group and tried to send private messages to every member, harvesting our emails.

Humbly suggest that the SYS ADMIN of groups.io be notified, and modify the website code to better obscure or even delete all email addr and should just out pseudo, except to other members.


Re: Email adresses of group exposed

Jean-Paul
 

Rebonjour a tous....

A few points please...

1/ The posts exposed cover dates December‎ ‎15‎, ‎2018 up to present.

2/ Google search was done with my email in ".." for exact match

3/ That email has been used for may other sites and some of the usual merchants for 20 years.

4/ Of several email addr, its the only one that's spammed daily, in waves, sometimes 10-25 per day. As they all arrive early in the day or overnight, i suspect China.

5/ I cannot spam filter these effectively, nor easily change that address.

6/ Google is worst, Bing finds some of our posts but less, Duck Duck GOGO found ony a few old datasheets, nothing from our group.

7/ No doubt all other groups.io forums are affected.

8/ Another possible penetration is a spammer joins the group and tried to send private messages to every member, harvesting our emails.

Humbly suggest that the SYS ADMIN of groups.io be notified, and modify the website code to better obscure or even delete all email addr and should just out pseudo, except to other members.

Bon Soiree,

Jon


Re: Email adresses of group exposed

Roy Morgan <k1lky68@...>
 

Thanks for the reminder about DuckDuckGo. I have intended to switch.

Not long ago there was an article on BBC News titled something like "What does Amazon (Google?) know about you?" The article was alarming.

Recent tv ads from DuckDuckGo tell about their intention to help us improve our privacy. Is that something beyond the functions of the search engine?

Roy Morgan
K1LKY Western Mass

On Jun 19, 2021, at 10:45 AM, tekscopegroup@... wrote:

It looks like the search engine crawlers have found a way into the groups message database.
...

BTW I checked my email hits on the Duckduckgo search, I stopped using Google and their invasive tracking and siphoning of ones metadata practices some time ago, and have never looked back since.

https://duckduckgo.com
-=-=-=-=-


Re: Email adresses of group exposed

Alex
 

It looks like the search engine crawlers have found a way into the groups message database. This might be due to a setting not properly configured, or a recent change made by Io-groups admin themselves, although as pointed out the hits I got off my email address where only from Tekscopes but none from other groups I also subscribe. So it looks like this groups is only affected. BTW I checked my email hits on the Duckduckgo search, I stopped using Google and their invasive tracking and siphoning of ones metadata practices some time ago, and have never looked back since.

https://duckduckgo.com


Re: Tektronix 603A Storage Monitor Questions

Harvey White
 

Possibly a panadaptor readout for your receiver.  RF modulation monitor on the transmitter.  Dedicated scope with some TM500 modules.  Attach the inputs to the ramp and signal outputs of another scope, and you can freeze a trace for reference, somewhat of a dual screen oscilloscope with a memory, all analog.

Harvey

On 6/19/2021 1:11 AM, henryfinley wrote:
Thank for your help. I guess I need a couple 50ohm BNC cables, but don't know where on my 465 or 2215 to hook it all up. And I can't imagine what use a storage monitor would be good for in ordinary radio work. It's in fine shape, but i have an idea it's just more junk cluttering up my little living room.





Re: Email adresses of group exposed

 

I was wondering why the spam count was suddenly way up...Admin please fix!

Thanks,

John


Re: SG 502 Assistance?

Eric
 

Cory,
It seems everything is working normally. The AA501 has an effective range of 10hz-22Khz (Human Hearing) but the AA501 and A will take in to account harmonics up to 300 Khz. But they don’t really make measurements that high as noted by the filters on the front panel. A weight and 80Khz Low pass. If you need to make measurements above 100 Khz you will need another instrument usually a Spectrum analyzer at that point. Also when it comes to the SG 502 and the 505 there are not many adjustments that can be made on the units so they don’t really drift out of spec. Now dirty switches will cause them to go nuts and make the outputs do funny things. But you can usually trust their distortion specs. Also, if you are trying to get to 500 Khz you are well outside the range of the AA501

For the stiff knob use and instrument grade oil. In my lab I have white lily sewing machine oil but I also have CRAIG instrument oil. A small amount on the brass reduction drive in the front and exercise the knob should get it freed right up. I will send you an e-mail off list with some additional information to some resources.

Eric

-----Original Message-----
From: TekScopes@groups.io <TekScopes@groups.io> On Behalf Of sweetbeats
Sent: Tuesday, June 15, 2021 1:02 AM
To: TekScopes@groups.io
Subject: [TekScopes] SG 502 Assistance?

Greetings everybody.

Hope this is an okay place to post this. I’m a member of the TM 500 group as well and will redirect this to there if advised.

I’ve been a member for some years but really essentially lurk as time to tinker with my audio and Tek gear is in limited to non-existent supply.

But the time has come to try and get my stuff working. I have a modest TM 500 setup…mainly using two TM 504 frames loaded with:

SC 502 (needs work…have a couple parts units) DM 501A (dead…doesn’t appear to power up) PS 503A (works!) FG 502 (unknown commodity just yet) AA 501A (seems to work!) SG 502 (this seems to work too…more below)

I have additional modules, DC 504 (unknown commodity), an additional PS 503A, PS 501-1, DD 501, and too many mainframes…need to get rid of some…RTM 506, two spare TM 504, and two TM 503.

I want to use my TM 500 gear primarily to maintain/repair analog audio equipment.

Okay.

That’s the rundown.

So I’m working on the SG 502. It cleaned up nice, the frequency range buttons are a bit sticky, but the AA 501A says it is producing <0.004% THD from about 9Hz to 108kHz. Nice! The interesting thing is once you go outside of that range, like almost immediately, the distortion goes up considerably. Like…50% THD and higher. Are there any usual suspects I should address as a given with my SG 502 before doing anything else, or outside of that does anybody have any suggestions for a next step to helping it perform within spec across it’s designed frequency range (5Hz to 500kHz)?

Thanks!

Cory Oace


Re: Tek 2230, almost fixed but with a problem out of my competences

Pitpat
 

On Sat, Jun 19, 2021 at 02:20 PM, Albert Otten wrote:


Hi Federico, you write this as if you have literally searched for a short
between traces? A DMM resistance measurement between pins 1 and 12 would
suffice.
Oh, yes i tought you meant like some tipe of short between the traces and not to gnd (pin12), I've tested the resistance between pin 12 an 1 and got 51.9k Ohm

On Sat, Jun 19, 2021 at 02:20 PM, Albert Otten wrote:


It seems inevitable now to think of internal leakage somewhere in the chip.
With the effect of shifting the levels at with the comparator changes states.
Probably more and more negative voltage is needed at pin 6 to have pin 1 open
drain while warming up. At 4k HOR REF (about -2 V) pin 6 is never negative
enough from start. 1k HOR REF (-8 V) initially might work but also can't pull
pin 6 enough negative after warming up.
I sometimes use "FREEZE" spray to investigate the role of temperature.
Albert
Now thats a cool experiment :) i should have somewhere the stuff i use sporadically to clean servers fans, here in italy it's mislabeled as "compressed air" but as a matter of fact is just refrigerant in a can.
I for sure have some buthane but something is telling me is not quite a good idea to use that....
I think i'll also order some tlc374 to replace U781


Re: explosion mystery on my 7104

Brian
 

I agree with that , the line filter in my 7104 went . Fortunately the earth leakage breaker went before any explosion in that instance but other instruments using that same age and brand of line filter have all needed replacement as a result of explosions of one sort or another - sometimes mild others not .
My 2465A needed the RIFA's replaced , the scope told me so with a loud hissing noise and a cloud of grey smoke blown out the fan exhaust about 30minutes after I unpacked it several years ago , the smell lasted for about a week .

On Saturday, 19 June 2021, 13:37:50 BST, Carsten Bormann <cabocabo@...> wrote:

On 2021-06-19, at 01:19, Sparky99 <jnolan@...> wrote:

brown tar like goo
That is most likely the result of an exploded Schaffner line filter — the ones built in the 1980s used to have internal RIFA (or RIFA-like?) caps across line and neutral, and these RIFA caps do explode, the occasional deniers here notwithstanding.

If you want to see how this looks like for non-enclosed RIFA caps, see e.g.:

https://youtu.be/c2dgI7duA7w?t=840
https://youtu.be/XAbrU17hLTM?t=160

(Humidity and 230 V are contributing, but not necessary, factors; don’t be fooled.  References to the 250 V working voltage are irrelevant, as the caps were *designed* to operate with that; it is the crazing and the moisture ingress that wasn’t part of the design, and that is pretty much independent of the voltage.
Of course, the short can be two to four times more violent at 230 V...)

When the internal cap shorts and explodes inside the Schaffner filter, there is no way for the heat and the plasm/gases to get out, so the tar-like potting of the Schaffner filter (which turns out *not* to be blocking the humidity) melts/sublimates and is spewed out with the RIFA gases.  The resulting jet of molten tar and stinky RIFA gases can go anywhere, often outside the unit (the line filter being installed in the back panel); mine went about a foot in a straight line before it hit furniture.

PUBLIC SERVICE ANNOUNCEMENT:
Replace on sight: the 1980s RIFA caps in transparent epoxy blobs (replace even if you can’t see the cracks yet — they are sometimes on one side only and hard to see), and Schaffner inlet filters from ~ the 1980s (newer Schaffners are fine, as are other brands).

Grüße, Carsten


Re: explosion mystery on my 7104

Carsten Bormann
 

On 2021-06-19, at 01:19, Sparky99 <jnolan@...> wrote:

brown tar like goo
That is most likely the result of an exploded Schaffner line filter — the ones built in the 1980s used to have internal RIFA (or RIFA-like?) caps across line and neutral, and these RIFA caps do explode, the occasional deniers here notwithstanding.

If you want to see how this looks like for non-enclosed RIFA caps, see e.g.:

https://youtu.be/c2dgI7duA7w?t=840
https://youtu.be/XAbrU17hLTM?t=160

(Humidity and 230 V are contributing, but not necessary, factors; don’t be fooled. References to the 250 V working voltage are irrelevant, as the caps were *designed* to operate with that; it is the crazing and the moisture ingress that wasn’t part of the design, and that is pretty much independent of the voltage.
Of course, the short can be two to four times more violent at 230 V...)

When the internal cap shorts and explodes inside the Schaffner filter, there is no way for the heat and the plasm/gases to get out, so the tar-like potting of the Schaffner filter (which turns out *not* to be blocking the humidity) melts/sublimates and is spewed out with the RIFA gases. The resulting jet of molten tar and stinky RIFA gases can go anywhere, often outside the unit (the line filter being installed in the back panel); mine went about a foot in a straight line before it hit furniture.

PUBLIC SERVICE ANNOUNCEMENT:
Replace on sight: the 1980s RIFA caps in transparent epoxy blobs (replace even if you can’t see the cracks yet — they are sometimes on one side only and hard to see), and Schaffner inlet filters from ~ the 1980s (newer Schaffners are fine, as are other brands).

Grüße, Carsten


Re: Email adresses of group exposed

John Clark
 

I would also agree with Jean-Paul. My email address shows up in searches from Tekscopes, as well. I, too, have seen a huge increase in spam recently. Interestingly, I am in another Groups.io group and that group's results are not showing up in Google searches.


John

________________________________
From: TekScopes@groups.io <TekScopes@groups.io> on behalf of Lee Houde <houdatto@...>
Sent: Saturday, June 19, 2021 8:18 AM
To: TekScopes@groups.io <TekScopes@groups.io>
Subject: Re: [TekScopes] Email adresses of group exposed

I would agree with Jena-Paul. I googled my email address and it did show
the Tekscopes messages with email addy. And I have recently seen more spam
in my inbox. Not inundated, but an unusual amiount

On Sat, Jun 19, 2021 at 6:10 AM Colin Herbert via groups.io <colingherbert=
blueyonder.co.uk@groups.io> wrote:

Jean-Paul,
You may well be "inundated with spam" but I am not. The way my posts come
from "Tekscopes" is the same as it always has been - some email addresses
are easily seen, but some are slightly obscured by a method which a human
can get around. Perhaps the problem is at your end?
Colin.

-----Original Message-----
From: TekScopes@groups.io [mailto:TekScopes@groups.io] On Behalf Of
Jean-Paul
Sent: 19 June 2021 10:59
To: TekScopes@groups.io
Subject: [TekScopes] Email adresses of group exposed

Hello all: Somehow the masking of our email adresses after the poster's
name has been compromised.

If you google your own email address the messages posted to Tekscopes and
other Groups.io will show up with FULL EMAIL address exposed.

This explains why we are inundated with spam.

Can the group admin or Groups.io Admin fix the appearance of our own email
adresses on the sie and messages?

I can post a screenshot if needed.
MANY THANKS

Kind Regards,

Jon












Re: Tek 2230, almost fixed but with a problem out of my competences

Albert Otten
 

Hi Federico, you write this as if you have literally searched for a short between traces? A DMM resistance measurement between pins 1 and 12 would suffice.
Just some thoughts:
It seems inevitable now to think of internal leakage somewhere in the chip. With the effect of shifting the levels at with the comparator changes states. Probably more and more negative voltage is needed at pin 6 to have pin 1 open drain while warming up. At 4k HOR REF (about -2 V) pin 6 is never negative enough from start. 1k HOR REF (-8 V) initially might work but also can't pull pin 6 enough negative after warming up.
I sometimes use "FREEZE" spray to investigate the role of temperature.
Albert


Re: Email adresses of group exposed

 

I would agree with Jena-Paul. I googled my email address and it did show
the Tekscopes messages with email addy. And I have recently seen more spam
in my inbox. Not inundated, but an unusual amiount

On Sat, Jun 19, 2021 at 6:10 AM Colin Herbert via groups.io <colingherbert=
blueyonder.co.uk@groups.io> wrote:

Jean-Paul,
You may well be "inundated with spam" but I am not. The way my posts come
from "Tekscopes" is the same as it always has been - some email addresses
are easily seen, but some are slightly obscured by a method which a human
can get around. Perhaps the problem is at your end?
Colin.

-----Original Message-----
From: TekScopes@groups.io [mailto:TekScopes@groups.io] On Behalf Of
Jean-Paul
Sent: 19 June 2021 10:59
To: TekScopes@groups.io
Subject: [TekScopes] Email adresses of group exposed

Hello all: Somehow the masking of our email adresses after the poster's
name has been compromised.

If you google your own email address the messages posted to Tekscopes and
other Groups.io will show up with FULL EMAIL address exposed.

This explains why we are inundated with spam.

Can the group admin or Groups.io Admin fix the appearance of our own email
adresses on the sie and messages?

I can post a screenshot if needed.
MANY THANKS

Kind Regards,

Jon












Re: Tek 2230, almost fixed but with a problem out of my competences

Pitpat
 

Hi, I've been searching for the said short without succes, however I've noticed that sometimes all the sweep settings in A mode 1k, besides the slowest one, starts to works again and pin1 start to behave normally (with a voltage between 0v and 5v).
When, eventually,(or in 4k mode) the sweep settings goes back to crazy pin1 get back to -8.6v.
Since i couldn't find any short to the -8.6v could it be a diode which his reverse bias got out of spec leading to a short only when the scope is powered?


Re: Email adresses of group exposed

Colin Herbert
 

Jean-Paul,
You may well be "inundated with spam" but I am not. The way my posts come from "Tekscopes" is the same as it always has been - some email addresses are easily seen, but some are slightly obscured by a method which a human can get around. Perhaps the problem is at your end?
Colin.

-----Original Message-----
From: TekScopes@groups.io [mailto:TekScopes@groups.io] On Behalf Of Jean-Paul
Sent: 19 June 2021 10:59
To: TekScopes@groups.io
Subject: [TekScopes] Email adresses of group exposed

Hello all: Somehow the masking of our email adresses after the poster's name has been compromised.

If you google your own email address the messages posted to Tekscopes and other Groups.io will show up with FULL EMAIL address exposed.

This explains why we are inundated with spam.

Can the group admin or Groups.io Admin fix the appearance of our own email adresses on the sie and messages?

I can post a screenshot if needed.
MANY THANKS

Kind Regards,

Jon


Email adresses of group exposed

Jean-Paul
 

Hello all: Somehow the masking of our email adresses after the poster's name has been compromised.

If you google your own email address the messages posted to Tekscopes and other Groups.io will show up with FULL EMAIL address exposed.

This explains why we are inundated with spam.

Can the group admin or Groups.io Admin fix the appearance of our own email adresses on the sie and messages?

I can post a screenshot if needed.
MANY THANKS

Kind Regards,

Jon


Re: SG 502 Assistance?

EJP
 

Is this just on one frequency multiplier selection? If so I would get interested in the capacitors that get switched by it, C50-55.

But I agree you need to describe the waveform.

The later SG502s with the M34075 changes to the oscillator have much better THD+N than specified. Mine for example.

EJP


Re: Tektronix 603A Storage Monitor Questions

 

Thank for your help. I guess I need a couple 50ohm BNC cables, but don't know where on my 465 or 2215 to hook it all up. And I can't imagine what use a storage monitor would be good for in ordinary radio work. It's in fine shape, but i have an idea it's just more junk cluttering up my little living room.


Re: explosion mystery on my 7104

Harvey White
 

To summarize what I remember of the threads:

1) the coating over the capacitors tends to crack

2) that may or may not let moisture in

3) if so, and even if not, the failures at 120 volts or so are infrequent (definition: not constant)

4) at 220 volts or 240 volts, the failures seem to be a matter of time. (and short time, too.)

I've had a RIFA capacitor fail on a tektronix scope, don't remember which one, though.  Only one, and I've got a few...

Harvey

On 6/18/2021 10:19 PM, Charles wrote:
I've only had one Rifabomb ever, but it was spectacular... last year, a DEC VT240 terminal that had been in non-climate-controlled storage for a long time. I powered it up, and it was working other than a bad 4116 RAM (another common failure of the era). For about ten minutes. Then an amazing quantity of foul-smelling black smoke spewed from the case vents and I yanked the power cord. Once the smoking stopped, I opened it up, and sure 'nough. One Rifa line cap was in three pieces.





Re: explosion mystery on my 7104

 

I've only had one Rifabomb ever, but it was spectacular... last year, a DEC VT240 terminal that had been in non-climate-controlled storage for a long time. I powered it up, and it was working other than a bad 4116 RAM (another common failure of the era). For about ten minutes. Then an amazing quantity of foul-smelling black smoke spewed from the case vents and I yanked the power cord. Once the smoking stopped, I opened it up, and sure 'nough. One Rifa line cap was in three pieces.

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