Or use one of those handy metal thingies from Home Depot to open
paint cans if you're here in the States. Doubles as a bottle opener
so you can have a cold one while you paint! Don't blame me if your
paint job doesn't come out so great, though. ;)

Jim Ford

------ Original Message ------
From: "Daveolla" <grobbins@netflash.net>
To: TekScopes@groups.io
Sent: 11/17/2020 9:44:13 AM
Subject: Re: [TekScopes] Replacing cable on P6075A probe

Greeting, Also, take note of what the manual says about shortening
the cable and Connector Replacement" page 2 ( 6 of 11) of the
P6075A version from the links given earlier in this thread;

http://w140.com/tekwiki/wiki/P6075

It is also repeated (or vise versa) in the plain P6075 manual on
page 5 at the same link.
It states;

"Substitution of non-standard parts is not advisable if the
original performance is to be restored. Even shortening the cable
by more than a few percent will have a noticeable effect on the
transient response of the probe. The resistive center conductor has
been specifically selected for critical dampening of reflections
that would otherwise exist."

And then is the "Conector Replacement" next with step 1 as "Remove
the snap- fit cover on the compensation box." They dont tell you
how to do that though. Perhaps the plastic has stiffened
somewhat suggesting you need a good pry from a screwdriver.
Perhaps a blade edge of knife gently if a finger nail wont budge
it. It can also be stuck and needs to be cracked loose. If you nick
or dint then you gotta fix that somehow........or I do. Leave
no marks is the goal.

Im sure we have all seen somones attempt at opening stuff up, TVs,
phones, etc that looked like a jackhammer attacked it everywhere.
Use a screwdriver for what it was intended, prying open paint cans!!!

On a side note, what is the difference in the plain P6075 and the
A version? I see the specs for the plain versions input impedance
is 10meg within 0.4% and 0.5% for the A.

Dave

You could make  a nice bug zapper with all those wires, and repurpose its HV supply
at the same time!
Dave

At 10:59 AM 11/17/2020, you wrote:

On 11/16/20 9:58 PM, Chuck Harris wrote re trinitrons:

It really was an economy in design.  The electronics was simplified,
and the accuracy and brightness of the screen was greatly improved.

Thanks for that reverse engineering analysis.  Sounds like the concepts the
original designer could have thought dealing with when coming up with the taught
wires method.

-----Original Message-----
From: TekScopes@groups.io [mailto:TekScopes@groups.io] On Behalf Of

Sent: 17 November 2020 17:44
To: TekScopes@groups.io
Subject: Re: [TekScopes] Replacing cable on P6075A probe

Greeting, Also, take note of what the manual says about shortening
the cable and Connector Replacement" page 2 ( 6 of 11) of the P6075A
version from the links given earlier in this thread;

http://w140.com/tekwiki/wiki/P6075

It is also repeated (or vise versa) in the plain P6075 manual on page
5 at the same link.
It states;

"Substitution of non-standard parts is not advisable if the original
performance is to be restored. Even shortening the cable by more than
a few percent will have a noticeable effect on the transient response
of the probe. The resistive center conductor has been specifically
selected for critical dampening of reflections that would otherwise

And then is the "Conector Replacement" next with step 1 as "Remove
the snap- fit cover on the compensation box." They dont tell you how
to do that though. Perhaps the plastic has stiffened
somewhat suggesting you need a good pry from a screwdriver. Perhaps
a blade edge of knife gently if a finger nail wont budge it. It can
also be stuck and needs to be cracked loose. If you nick or dint then
you gotta fix that somehow........or I do. Leave no marks is the goal.

Im sure we have all seen somones attempt at opening stuff up, TVs,
phones, etc that looked like a jackhammer attacked it everywhere. Use
a screwdriver for what it was intended, prying open paint cans!!!

On a side note, what is the difference in the plain P6075 and the A
version? I see the specs for the plain versions input impedance is
10meg within 0.4% and 0.5% for the A.

Dave

Not quite right to compare 250 to 10Meg and declare 200 to be
therefore ok. By that logic, zero ohms should be just fine, too.
Yet, Tek went to the trouble to use resistance wire. Clearly there's a

The purpose of the resistance wire is to damp out reflections due to
mismatch. There's a Goldilocks optimum for each length that balances
bandwidth against aberrations. If you deviate from that balance,
either parameter degrades.

That said, you're probably not going to notice any dramatic change.
But if you had before and after measurements, you'd see a difference.

Tom

Sent from my iThing, so please excuse the terseness and typos

On Nov 17, 2020, at 5:24, "Brent W8XG" <brent@pwg.net> wrote:

No, I did not do a YouTube video. But I've seen one out there. I

didn't have a replacement cable or other parts. I cut my cable off
at both ends as close as I could to the strain-relief parts, then
tested the cable. It tested good, so I knew I'd cut out somewhere
the break. I used the typical wire strippers to remove the
insulation. I was very slow and methodical. But I was surprised at
how fine that wire was. Then I had to clean out both strain
relief's, with a Dremel. Once cleaned out, I pried them open just a
little, to be able to slip the cable in and then crimp.

So my cable is now a little shorter. The 250 ohm's is likely

about right given the size of the wire, but I didn't measure it. So
my cable might be 200 ohm's now. But with the 9k resistor in there
to make it a 10x probe, I doubt it matters much.

I don't know what the grommet is for. Maybe it's to slip over the

cable and then crimp to become strain relief??

Regards,

On 11/16/20 9:58 PM, Chuck Harris wrote re trinitrons:

It really was an economy in design. The electronics was simplified,
and the accuracy and brightness of the screen was greatly improved.

Thanks for that reverse engineering analysis. Sounds like the concepts the original designer could have thought dealing with when coming up with the taught wires method.

Or use one of those handy metal thingies from Home Depot to open paint cans if you're here in the States. Doubles as a bottle opener so you can have a cold one while you paint! Don't blame me if your paint job doesn't come out so great, though. ;)

Jim Ford

------ Original Message ------
From: "Daveolla" <grobbins@netflash.net>
To: TekScopes@groups.io
Sent: 11/17/2020 9:44:13 AM
Subject: Re: [TekScopes] Replacing cable on P6075A probe

Greeting, Also, take note of what the manual says about shortening the cable and Connector Replacement" page 2 ( 6 of 11) of the P6075A version from the links given earlier in this thread;

http://w140.com/tekwiki/wiki/P6075

It is also repeated (or vise versa) in the plain P6075 manual on page 5 at the same link.
It states;

"Substitution of non-standard parts is not advisable if the original performance is to be restored. Even shortening the cable by more than a few percent will have a noticeable effect on the transient response of the probe. The resistive center conductor has been specifically selected for critical dampening of reflections that would otherwise exist."

And then is the "Conector Replacement" next with step 1 as "Remove the snap- fit cover on the compensation box." They dont tell you how to do that though. Perhaps the plastic has stiffened somewhat suggesting you need a good pry from a screwdriver. Perhaps a blade edge of knife gently if a finger nail wont budge it. It can also be stuck and needs to be cracked loose. If you nick or dint then you gotta fix that somehow........or I do. Leave no marks is the goal.

Im sure we have all seen somones attempt at opening stuff up, TVs, phones, etc that looked like a jackhammer attacked it everywhere. Use a screwdriver for what it was intended, prying open paint cans!!!

On a side note, what is the difference in the plain P6075 and the A version? I see the specs for the plain versions input impedance is 10meg within 0.4% and 0.5% for the A.

Dave

Greeting, Also, take note of what the manual says about shortening the cable and Connector Replacement" page 2 ( 6 of 11) of the P6075A version from the links given earlier in this thread;

http://w140.com/tekwiki/wiki/P6075

It is also repeated (or vise versa) in the plain P6075 manual on page 5 at the same link.
It states;

"Substitution of non-standard parts is not advisable if the original performance is to be restored. Even shortening the cable by more than a few percent will have a noticeable effect on the transient response of the probe. The resistive center conductor has been specifically selected for critical dampening of reflections that would otherwise exist."

And then is the "Conector Replacement" next with step 1 as "Remove the snap- fit cover on the compensation box." They dont tell you how to do that though. Perhaps the plastic has stiffened somewhat suggesting you need a good pry from a screwdriver. Perhaps a blade edge of knife gently if a finger nail wont budge it. It can also be stuck and needs to be cracked loose. If you nick or dint then you gotta fix that somehow........or I do. Leave no marks is the goal.

Im sure we have all seen somones attempt at opening stuff up, TVs, phones, etc that looked like a jackhammer attacked it everywhere. Use a screwdriver for what it was intended, prying open paint cans!!!

On a side note, what is the difference in the plain P6075 and the A version? I see the specs for the plain versions input impedance is 10meg within 0.4% and 0.5% for the A.

Dave

At 07:51 AM 11/17/2020, you wrote:

Not quite right to compare 250 to 10Meg and declare 200 to be therefore ok. By that logic, zero ohms should be just fine, too. Yet, Tek went to the trouble to use resistance wire. Clearly there's a reason!

The purpose of the resistance wire is to damp out reflections due to mismatch. There's a Goldilocks optimum for each length that balances bandwidth against aberrations. If you deviate from that balance, either parameter degrades.

That said, you're probably not going to notice any dramatic change. But if you had before and after measurements, you'd see a difference.

Tom

Sent from my iThing, so please excuse the terseness and typos

On Nov 17, 2020, at 5:24, "Brent W8XG" <brent@pwg.net> wrote:

No, I did not do a YouTube video. But I've seen one out there. I didn't have a replacement cable or other parts. I cut my cable off at both ends as close as I could to the strain-relief parts, then tested the cable. It tested good, so I knew I'd cut out somewhere the break. I used the typical wire strippers to remove the insulation. I was very slow and methodical. But I was surprised at how fine that wire was. Then I had to clean out both strain relief's, with a Dremel. Once cleaned out, I pried them open just a little, to be able to slip the cable in and then crimp.

So my cable is now a little shorter. The 250 ohm's is likely about right given the size of the wire, but I didn't measure it. So my cable might be 200 ohm's now. But with the 9k resistor in there to make it a 10x probe, I doubt it matters much.

I don't know what the grommet is for. Maybe it's to slip over the cable and then crimp to become strain relief??

Regards,

Not quite right to compare 250 to 10Meg and declare 200 to be therefore ok. By that logic, zero ohms should be just fine, too. Yet, Tek went to the trouble to use resistance wire. Clearly there's a reason!

The purpose of the resistance wire is to damp out reflections due to mismatch. There's a Goldilocks optimum for each length that balances bandwidth against aberrations. If you deviate from that balance, either parameter degrades.

That said, you're probably not going to notice any dramatic change. But if you had before and after measurements, you'd see a difference.

Tom

Sent from my iThing, so please excuse the terseness and typos

On Nov 17, 2020, at 5:24, "Brent W8XG" <brent@pwg.net> wrote:

No, I did not do a YouTube video. But I've seen one out there. I

didn't have a replacement cable or other parts. I cut my cable off at both ends as close as I could to the strain-relief parts, then tested the cable. It tested good, so I knew I'd cut out somewhere the break. I used the typical wire strippers to remove the insulation. I was very slow and methodical. But I was surprised at how fine that wire was. Then I had to clean out both strain relief's, with a Dremel. Once cleaned out, I pried them open just a little, to be able to slip the cable in and then crimp.

So my cable is now a little shorter. The 250 ohm's is likely

about right given the size of the wire, but I didn't measure it. So my cable might be 200 ohm's now. But with the 9k resistor in there to make it a 10x probe, I doubt it matters much.

I don't know what the grommet is for. Maybe it's to slip over the

cable and then crimp to become strain relief??

Regards,

No, I did not do a YouTube video. But I've seen one out there. I didn't have a replacement cable or other parts. I cut my cable off at both ends as close as I could to the strain-relief parts, then tested the cable. It tested good, so I knew I'd cut out somewhere the break. I used the typical wire strippers to remove the insulation. I was very slow and methodical. But I was surprised at how fine that wire was. Then I had to clean out both strain relief's, with a Dremel. Once cleaned out, I pried them open just a little, to be able to slip the cable in and then crimp.

So my cable is now a little shorter. The 250 ohm's is likely about right given the size of the wire, but I didn't measure it. So my cable might be 200 ohm's now. But with the 9k resistor in there to make it a 10x probe, I doubt it matters much.

I don't know what the grommet is for. Maybe it's to slip over the cable and then crimp to become strain relief??

Regards,

thanks to all who replied - the 2215A scope is off the bench for now but Ill get back to it soon and will report when I get this working...I am almost at the point of sticking a high quality transistor socket there and just trying some other close to J300 specs Jfets I have on hand...FYI all the parts I have tried in the Q122/Q222 position in the scope : 2N3918, NTE133, k19, NTE132 tested good out of circuit...i have some more Jfet #s in my stock I need to try.

From the Tektronix replaceable parts reg. : 151-1124-00 = Siliconix J-2400...would'nt be surprised this was not a custom design but more likely tested/hand picked J300s jfets and assigned a Tektronix custom part# from Siliconix...searching Siliconix j-2400 brings up nothing...Id suspect most input boards from that 22xx series scopes came off the assembly line with "J300" marked Jfets in those Q122/222 positions..thanks

I don’t have hard knowledge of that but the big deal about Trinitron wasn't the mask. It was the fact that there was only one electron gun and some pretty intricate electronic stuff done to emulate the three-gun standard color tubes. The benefit was overcoming the very difficult task of keeping the three gun cluster aligned in manufacture.

I can also say from experience if you don't feel real confident and have detailed instructions and test equipment don't try to align a Trinitron. The 9845 color head was one of the best it had a very nice calibration program built in

Steve


-----Original Message-----
From: TekScopes@groups.io <TekScopes@groups.io> On Behalf Of snapdiode via groups.io
Sent: Monday, November 16, 2020 9:59 AM
To: TekScopes@groups.io
Subject: Re: [TekScopes] Special Offer from Peter Keller to TekScopes Members: The Cathode Ray Tube, Technology, History, and Applications"

I'm a bit confused about the Trinitron having "dots", the Trinitron relies on stripes and the mask is an aperture grille.

In the days of color CRTs for television, I knew a guy who worked in a
broadcast studio. Though Trinitron displays (Tektronix made a display
monitor that used a Trinitron CRT) were used in the control room of the
studio, he said that they also had a conventional triangular dot shadow
mask monitor as that was what most home TVs used and they wanted to be sure
that the broadcast image looked as good on the triangle shadow mask monitor
as it did on the Trinitron ones. Whether or not this is true, I don't know.

Steve H.

On Mon, Nov 16, 2020 at 3:38 PM Dennis Tillman W7pF <dennis@ridesoft.com>
wrote:

Hi Barry,
As with so many things there is an excellent explanation on Wikipedia of
shadow mask and Trinitron tubes and how they work. It is at
https://en.wikipedia.org/wiki/Cathode-ray_tube.
Scroll down to the section I am referring to. No magic is involved, just a
shadow mask.
Dennis Tillman W7pF

-----Original Message-----
From: TekScopes@groups.io [mailto:TekScopes@groups.io] On Behalf Of n4buq
Sent: Monday, November 16, 2020 9:43 AM
To: TekScopes@groups.io
Subject: Re: [TekScopes] Special Offer from Peter Keller to TekScopes
Members: The Cathode Ray Tube, Technology, History, and Applications"

Hi Tom,

My question is probably quite simple but, like I said, I'm not finding a
good answer.

As I understand it (and from personal observation when I had a Trinitron
TV and I'm primarily wondering about this type of CRT but the question
probably applies to others), the screen has groupings of RBG phospher dots
and the RGB guns "activate" those dots as needed; however, what I'm not
understanding is how a given gun "activates" a given dot. Is a particular
phosphor dot sensitive to a property of one of the color guns such that a
blue dot ignores a red gun, etc.? If so, then I can somewhat understand it
but I'm wondering if I'm way off in that assumption.

The various sites just seem to indicate there are three guns, each of
which magically cause a given color to appear but it's not explained how a
single color gun causes a corresponding dot to glow without affecting the
ones around it.

(Hope that made sense...)

Thanks,
Barry - N4BUQ

----- Original Message -----

From: "Tom Lee" <tomlee@ee.stanford.edu>
To: TekScopes@groups.io
Sent: Monday, November 16, 2020 11:27:46 AM
Subject: Re: [TekScopes] Special Offer from Peter Keller to TekScopes
Members: The Cathode Ray Tube, Technology, History, and Applications"

Hi Barry,

Pete's book mainly covers electrostatically deflected crts. Except for
some very early models, TVs used magnetically deflected crts (to allow
large screens without absurd set depths). The guns are similar, but
the deflection methods are very different because of the different
optimization objectives.

--Tom

--
Prof. Thomas H. Lee
Allen Ctr., Rm. 205
350 Jane Stanford Way
Stanford University
Stanford, CA 94305-4070
http://www-smirc.stanford.edu

On 11/16/2020 07:18, n4buq wrote:

Does anyone know whether this book covers CRTs that were used for
color TVs (and other color displays)? I ask because I'm not finding
good information on how those work.

Thanks,
Barry - N4BUQ

----- Original Message -----

From: "Dennis Tillman W7pF" <dennis@ridesoft.com>
To: TekScopes@groups.io
Sent: Monday, November 16, 2020 12:15:11 AM
Subject: Re: [TekScopes] Special Offer from Peter Keller to
TekScopes
Members: The Cathode Ray Tube, Technology, History, and
Applications"

Hi Chris,
I don't expect any problems shipping this to Germany.

One correction:
This offer is strictly between Peter Keller and individual members
of the group. I did offer to act as the go-between because I
thought there might be some interest and because I understood how
"sensitive" our members are to price. I was also hoping this would
give Peter some well-deserved cash as we get close to the holidays.

So I told Peter I thought I might be able to pass along 10 orders
for his book. When he said OK I notified TekScopes. That was 36
hours ago. I have orders for over 50 of his books as of this moment.

This brings back memories of when I asked for small donations to
pay Groups.io the annual fee for hosting TekScopes back at the
beginning of the year. Somebody please remind me the next time I
think up something like this to think twice about what happened the
last two times I had a bright idea.
:)

Dennis Tillman W7pF

-----Original Message-----
From: TekScopes@groups.io [mailto:TekScopes@groups.io] On Behalf Of
ChrisBeee via groups.io
Sent: Sunday, November 15, 2020 8:47 PM
To: TekScopes@groups.io
Subject: Re: [TekScopes] Special Offer from Peter Keller to
TekScopes
Members: The Cathode Ray Tube, Technology, History, and Applications"

Hi Dennis,
I would be more than glad if I could support the group buy and get
a copy of Peter's book, many thanks for making this possible! My
only concern is if you would ship to Germany too. I will send you a
PM with my contact data.
Cheers
Chris







--
Dennis Tillman W7pF
TekScopes Moderator

--
Dennis Tillman W7pF
TekScopes Moderator

Hi Tom,

My question is probably quite simple but, like I said, I'm not finding a good answer.

As I understand it (and from personal observation when I had a Trinitron TV and I'm primarily wondering about this type of CRT ........
(Hope that made sense...)

Thanks,
Barry - N4BUQ

----- Original Message -----

From: "Tom Lee" <tomlee@ee.stanford.edu>
To: TekScopes@groups.io
Sent: Monday, November 16, 2020 11:27:46 AM
Subject: Re: [TekScopes] Special Offer from Peter Keller to TekScopes Members: The Cathode Ray Tube, Technology,
History, and Applications"

Hi Barry,

Pete's book mainly covers electrostatically deflected crts. Except for
some very early models, TVs used magnetically deflected crts (to allow
large screens without absurd set depths). The guns are similar, but the
deflection methods are very different because of the different
optimization objectives.

--Tom

--
Prof. Thomas H. Lee
Allen Ctr., Rm. 205
350 Jane Stanford Way
Stanford University
Stanford, CA 94305-4070
http://www-smirc.stanford.edu

On 11/16/2020 07:18, n4buq wrote:

Does anyone know whether this book covers CRTs that were used for color TVs
(and other color displays)? I ask because I'm not finding good
information on how those work.

Thanks,
Barry - N4BUQ

----- Original Message -----

From: "Dennis Tillman W7pF" <dennis@ridesoft.com>
To: TekScopes@groups.io
Sent: Monday, November 16, 2020 12:15:11 AM
Subject: Re: [TekScopes] Special Offer from Peter Keller to TekScopes
Members: The Cathode Ray Tube, Technology,
History, and Applications"

Hi Chris,
I don't expect any problems shipping this to Germany.

One correction:
This offer is strictly between Peter Keller and individual members of the
group. I did offer to act as the go-between because I thought there might
be
some interest and because I understood how "sensitive" our members are to
price. I was also hoping this would give Peter some well-deserved cash as
we
get close to the holidays.

So I told Peter I thought I might be able to pass along 10 orders for his
book. When he said OK I notified TekScopes. That was 36 hours ago. I have
orders for over 50 of his books as of this moment.

This brings back memories of when I asked for small donations to pay
Groups.io the annual fee for hosting TekScopes back at the beginning of
the
year. Somebody please remind me the next time I think up something like
this
to think twice about what happened the last two times I had a bright idea.
:)

Dennis Tillman W7pF

-----Original Message-----
From: TekScopes@groups.io [mailto:TekScopes@groups.io] On Behalf Of
ChrisBeee
via groups.io
Sent: Sunday, November 15, 2020 8:47 PM
To: TekScopes@groups.io
Subject: Re: [TekScopes] Special Offer from Peter Keller to TekScopes
Members: The Cathode Ray Tube, Technology, History, and Applications"

Hi Dennis,
I would be more than glad if I could support the group buy and get a copy
of
Peter's book, many thanks for making this possible! My only concern is if
you would ship to Germany too. I will send you a PM with my contact data.
Cheers
Chris







--
Dennis Tillman W7pF
TekScopes Moderator

Hi Dennis,

I had been to that page yesterday and I didn't quite understand some of it. Particularly, the following image wasn't helping that much.

https://en.wikipedia.org/wiki/Cathode-ray_tube#/media/File:CRT_color_enhanced.png

The reason being that they "paint" the color guns as if they're somehow controlling what color the phosphor will be when, in fact, that was just for clarification to show that the "red" gun was being aimed (through the hole in the mask) at the red phosphor, the "blue" gun at the blue phosphor, and the "green" gun at the green phosphor. The guns are all the same and it is only the phosphor that's different and that was what I was wondering. Perhaps a silly question but it was confusing me nonetheless. I understand it now (actually, Tom Lee helped explain it via a PM).

Thanks,
Barry - N4BUQ

----- Original Message -----

From: "Dennis Tillman W7pF" <dennis@ridesoft.com>
To: TekScopes@groups.io
Sent: Monday, November 16, 2020 2:38:24 PM
Subject: Re: [TekScopes] Special Offer from Peter Keller to TekScopes Members: The Cathode Ray Tube, Technology,
History, and Applications"

Hi Barry,
As with so many things there is an excellent explanation on Wikipedia of
shadow mask and Trinitron tubes and how they work. It is at
https://en.wikipedia.org/wiki/Cathode-ray_tube.
Scroll down to the section I am referring to. No magic is involved, just a
shadow mask.
Dennis Tillman W7pF

-----Original Message-----
From: TekScopes@groups.io [mailto:TekScopes@groups.io] On Behalf Of n4buq
Sent: Monday, November 16, 2020 9:43 AM
To: TekScopes@groups.io
Subject: Re: [TekScopes] Special Offer from Peter Keller to TekScopes
Members: The Cathode Ray Tube, Technology, History, and Applications"

Hi Tom,

My question is probably quite simple but, like I said, I'm not finding a good
answer.

As I understand it (and from personal observation when I had a Trinitron TV
and I'm primarily wondering about this type of CRT but the question probably
applies to others), the screen has groupings of RBG phospher dots and the
RGB guns "activate" those dots as needed; however, what I'm not
understanding is how a given gun "activates" a given dot. Is a particular
phosphor dot sensitive to a property of one of the color guns such that a
blue dot ignores a red gun, etc.? If so, then I can somewhat understand it
but I'm wondering if I'm way off in that assumption.

The various sites just seem to indicate there are three guns, each of which
magically cause a given color to appear but it's not explained how a single
color gun causes a corresponding dot to glow without affecting the ones
around it.

(Hope that made sense...)

Thanks,
Barry - N4BUQ

----- Original Message -----

From: "Tom Lee" <tomlee@ee.stanford.edu>
To: TekScopes@groups.io
Sent: Monday, November 16, 2020 11:27:46 AM
Subject: Re: [TekScopes] Special Offer from Peter Keller to TekScopes
Members: The Cathode Ray Tube, Technology, History, and Applications"

Hi Barry,

Pete's book mainly covers electrostatically deflected crts. Except for
some very early models, TVs used magnetically deflected crts (to allow
large screens without absurd set depths). The guns are similar, but
the deflection methods are very different because of the different
optimization objectives.

--Tom

--
Prof. Thomas H. Lee
Allen Ctr., Rm. 205
350 Jane Stanford Way
Stanford University
Stanford, CA 94305-4070
http://www-smirc.stanford.edu

On 11/16/2020 07:18, n4buq wrote:

Does anyone know whether this book covers CRTs that were used for
color TVs (and other color displays)? I ask because I'm not finding
good information on how those work.

Thanks,
Barry - N4BUQ

----- Original Message -----

From: "Dennis Tillman W7pF" <dennis@ridesoft.com>
To: TekScopes@groups.io
Sent: Monday, November 16, 2020 12:15:11 AM
Subject: Re: [TekScopes] Special Offer from Peter Keller to
TekScopes
Members: The Cathode Ray Tube, Technology, History, and
Applications"

Hi Chris,
I don't expect any problems shipping this to Germany.

One correction:
This offer is strictly between Peter Keller and individual members
of the group. I did offer to act as the go-between because I
thought there might be some interest and because I understood how
"sensitive" our members are to price. I was also hoping this would
give Peter some well-deserved cash as we get close to the holidays.

So I told Peter I thought I might be able to pass along 10 orders
for his book. When he said OK I notified TekScopes. That was 36
hours ago. I have orders for over 50 of his books as of this moment.

This brings back memories of when I asked for small donations to
pay Groups.io the annual fee for hosting TekScopes back at the
beginning of the year. Somebody please remind me the next time I
think up something like this to think twice about what happened the
last two times I had a bright idea.
:)

Dennis Tillman W7pF

-----Original Message-----
From: TekScopes@groups.io [mailto:TekScopes@groups.io] On Behalf Of
ChrisBeee via groups.io
Sent: Sunday, November 15, 2020 8:47 PM
To: TekScopes@groups.io
Subject: Re: [TekScopes] Special Offer from Peter Keller to
TekScopes
Members: The Cathode Ray Tube, Technology, History, and Applications"

Hi Dennis,
I would be more than glad if I could support the group buy and get
a copy of Peter's book, many thanks for making this possible! My
only concern is if you would ship to Germany too. I will send you a
PM with my contact data.
Cheers
Chris







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Dennis Tillman W7pF
TekScopes Moderator

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Dennis Tillman W7pF
TekScopes Moderator