Date   
Re: Curve tracer 576

yoram stein
 

Yes, it is right of the screen showing 4 switch positions. "per vertical "per horisonral" "per step" "beta or Gm per div". Mine is missing (some of those tracers were sold without that display I was told by the vendor).

Re: Tek 465 external trigger input cap substitute?

Colin Herbert
 

Hi Marco,



I didn’t realise that you are in Europe, as most members of this Group are
in the USA. I am in London, UK.

I have had another look at some of the places where I might expect unusual
components to be available and I have found this one:



http://markhindes.easywebstore.co.uk/searchresults.aspx?searchterm=ceramic



The capacitors are NOS Lemco 2.7 pF ceramic “from the 1960s”, but there is
no voltage quoted. I think I might expect then to be fairly high voltage,
but you could do worse than asking the question (there is a facility to do
so), or even buy a couple, as they are only £0.10 each.



Good Luck,

Colin.



From: TekScopes@... [mailto:TekScopes@...]
Sent: 10 September 2017 15:16
To: TekScopes@...
Subject: Re: [TekScopes] Tek 465 external trigger input cap substitute?





Thank you all very much!! I never found such commitment in any other forum,
that's great!

Ok then, I will end putting it together and when I'll find a 2.7p 200V
ceramic I will replace it.
Glad that I have broken a non original, wrong value replacement :-)
Thank you Dave for the surplussales.com link, but since I'm in Europe I'll
have to find something here..

Would it be fine to put an smd ceramic cap between BNC centre and BNC gnd,
instead of BNC centre and board ground plane?
Thank you all again!
Marco

[Non-text portions of this message have been removed]







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Re: What I REALLY Meant....

Chuck Harris
 

Hi Dennis,

The kovar leads on the 500 series are the diameter of
a miniature tube pin, and even though they are dead
soft, they don't bend without some considerable force...
very similar to bending a 12AU7's pin.

The pins on something like a 2465's CRT are much thinner,
and bend easily, but that is actually a good thing, as
they can be bent many, many times before breaking, and
won't break the glass seal area.

The problem comes when one can't see, and tries to jamb
a connector on the pin off axis, or in a way that
crushes closed the slot that allows the pin to enter
the sleeve.

-Chuck Harris

'Dennis Tillman' @Dennis_Tillman_W7PF [TekScopes] wrote:

Hi Chuck,

Messing with the Kovar deflection plate pins which come through the glass envelope
always makes me nervous. Kovar pins are easy to bend and I am always afraid I will
crack the glass when I bend one. I shy away from connecting to deflection plates
for this reason.

The only time I ever did this was when I hooked up the 7A21 to the vertical
deflection plate pins and I bent one of the pins. I almost had a heart attack.
Because the other end of the distributed deflection plates needed a termination
network (included inside the 7A21 for safe keeping until needed) there were
actually 4 pins that you had to connect to.

By now I have a few more scopes than I did then and I have a couple of dud CRTs
that I could practice on so I would be more comfortable doing this. I would still
need a good reason to connect direct to the plates of a Tek CRT.

On the other hand your experience with the port on the old Tek scopes is
essentially a green light to do this. I wish I was aware of this feature when I
was surrounded with 535s, 545s, and 547s. I just checked the 1967 catalog and
there, plain as day, is the metal hole plug on the CRT side of these scopes. Until
mow I never gave it a though.

I was fortunate that I had a mentor who used to work in the Metrology department
and in the Instrument Repair and Calibration department for the large company
where I was. He loved Tek scopes and he taught me everything he knew about them.
He instilled a sense of awe in me for the engineering excellence of that company
and their products. Apparently he didn't realize either what that hole plug was
for.

Dennis Tillman W7PF

Re: Curve tracer 576

Brent Watson <brentleew2003@...>
 

Are you referring to the 4 fiber optic readout module on the "right" side of the display?

On Sunday, September 10, 2017, 2:44:48 AM PDT, ajaxole@... [TekScopes] <TekScopes@...> wrote:

 
For my recently bought 576 curve racer I am looking for a "range display" plug in (the part left of the screen that shows 4 settings of knobs. contact mail: sp856567@...

[Non-text portions of this message have been removed]

Re: Tek 465 external trigger input cap substitute?

Marco
 

Thank you all very much!! I never found such commitment in any other forum, that's great!

Ok then, I will end putting it together and when I'll find a 2.7p 200V ceramic I will replace it.
Glad that I have broken a non original, wrong value replacement :-)
Thank you Dave for the surplussales.com link, but since I'm in Europe I'll have to find something here..

Would it be fine to put an smd ceramic cap between BNC centre and BNC gnd, instead of BNC centre and board ground plane?
Thank you all again!
Marco

Re: Still want a Tek 5030 or 5031 scope...

magnustoelle
 

Hello Walter,

Well, as you are so desperately looking for one, here is a friendly hint:
I came across a 5030 on eBay.de item# 182648785851 when I was searching for something else.

The item is located in Germany, so shipment costs may be high.
I'd contact the seller to see, if he considers international shipment at all, if I were you.

I have absolutely no affiliation with the seller.

Cheers,

Magnus


On 10/09/2017 01:00, @walter2 [TekScopes] wrote:

Anybody got one? Happy to buy or swap as needed to get a good one, but my budget is not as vast as the $2500 ebay price for a broken RM5030 at the moment.


any help appreciated!
all the best,
walter (walter2 -at- sphere.bc.ca)
sphere research corp.

.

Curve tracer 576

yoram stein
 

For my recently bought 576 curve racer I am looking for a "range display" plug in (the part left of the screen that shows 4 settings of knobs. contact mail: sp856567@...

Re: What I REALLY Meant....

 

Hmmm I wonder if something like a Raspberry PI could be used for this - it has the digitisers and HDMI output.

Too much operating system - may be a simple SoC?

Dave

-----Original Message-----
From: TekScopes@... [mailto:TekScopes@...]
Sent: 10 September 2017 07:54
To: TekScopes@...
Subject: Re: [TekScopes] What I REALLY Meant....

Walter:
Someone thinks they have a market and have some drop in replacements for test equipment like spectrum analyzers. http://vectorvgapro.com/Scan_Convertor_Products.html#Replacement

I doubt very much it's $10.00. No affiliation.



On Sunday, September 10, 2017 1:29 AM, "'Dennis Tillman' @Dennis_Tillman_W7PF [TekScopes]" <TekScopes@...> wrote:


Hi Chuck,

Messing with the Kovar deflection plate pins which come through the glass envelope always makes me nervous. Kovar pins are easy to bend and I am always afraid I will crack the glass when I bend one. I shy away from connecting to deflection plates for this reason.

The only time I ever did this was when I hooked up the 7A21 to the vertical deflection plate pins and I bent one of the pins. I almost had a heart attack. Because the other end of the distributed deflection plates needed a termination network (included inside the 7A21 for safe keeping until needed) there were actually 4 pins that you had to connect to.

By now I have a few more scopes than I did then and I have a couple of dud CRTs that I could practice on so I would be more comfortable doing this. I would still need a good reason to connect direct to the plates of a Tek CRT.

On the other hand your experience with the port on the old Tek scopes is essentially a green light to do this. I wish I was aware of this feature when I was surrounded with 535s, 545s, and 547s. I just checked the 1967 catalog and there, plain as day, is the metal hole plug on the CRT side of these scopes. Until mow I never gave it a though.

I was fortunate that I had a mentor who used to work in the Metrology department and in the Instrument Repair and Calibration department for the large company where I was. He loved Tek scopes and he taught me everything he knew about them. He instilled a sense of awe in me for the engineering excellence of that company and their products. Apparently he didn't realize either what that hole plug was for.

Dennis Tillman W7PF

-----Original Message-----
Sent: Saturday, September 09, 2017 9:08 PM
Subject: Re: [TekScopes] What I REALLY Meant....

Ok, but to simply connect the deflection plates to the
600 series CRT would have been inspirational, as that is what Tektronix would have expected you to do.

Why do I say that?

Thousands of tektronix scopes (no one else did it) with that capability kind of tells the tale. It was meant to be.

-Chuck Harris

@walter2 [TekScopes] wrote:
actually, Dennis had it exactly right, my suggestion was to use a
remote monitor (ideally with differential inputs) to replace the dead
577 CRT display. I use this trick all the time to restore HP spectrum
and network analyzers with kaput and irreplaceable CRTs. a single
ended input works fine IF the system already brings out XYZ signals on
the rear apron for use. most applications need the Z input because of
complex blanking issues, especially where on-screen data is involved.

If there's no external video, then you have to go inside, and that
usually works best with differential inputs.

I have used the Tek 600 series displays, the HP 1340A series , and
some Tek 7K scopes. This problem is becoming more acute because many
very good high end systems are nearing end of life due to bad CRTs,
corrupted EPROM contents and so forth. to have a good bag of tricks to
combat this is becoming more and more important. Tek fans have easy
ways to bring their scope collections to bear on these problems.

what I'd REALLY like to find is some kind of stock LCD display system
with XY (at
least) inputs, as this could solve so many requirements. an alternate
would be a VGA or better to XY adaptor to breathe life into all those
garage sale LCD monitors for $10. I keep hoping to find one.

all the best, walter (walter2 -at- sphere.bc.ca) sphere research corp
------------------------------------
Posted by: Chuck Harris <cfharris@...>
------------------------------------

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[Non-text portions of this message have been removed]



------------------------------------
Posted by: KeepIt SimpleStupid <keepitsimplestupid@...>
------------------------------------


------------------------------------

Yahoo Groups Links

Re: What I REALLY Meant....

KeepIt SimpleStupid
 

Walter:
Someone thinks they have a market and have some drop in replacements for test equipment like spectrum analyzers.  http://vectorvgapro.com/Scan_Convertor_Products.html#Replacement

I doubt very much it's $10.00.  No affiliation.

On Sunday, September 10, 2017 1:29 AM, "'Dennis Tillman' @Dennis_Tillman_W7PF [TekScopes]" <TekScopes@...> wrote:


  Hi Chuck,

Messing with the Kovar deflection plate pins which come through the glass envelope always makes me nervous. Kovar pins are easy to bend and I am always afraid I will crack the glass when I bend one. I shy away from connecting to deflection plates for this reason.

The only time I ever did this was when I hooked up the 7A21 to the vertical deflection plate pins and I bent one of the pins. I almost had a heart attack. Because the other end of the distributed deflection plates needed a termination network (included inside the 7A21 for safe keeping until needed) there were actually 4 pins that you had to connect to.

By now I have a few more scopes than I did then and I have a couple of dud CRTs that I could practice on so I would be more comfortable doing this. I would still need a good reason to connect direct to the plates of a Tek CRT.

On the other hand your experience with the port on the old Tek scopes is essentially a green light to do this. I wish I was aware of this feature when I was surrounded with 535s, 545s, and 547s. I just checked the 1967 catalog and there, plain as day, is the metal hole plug on the CRT side of these scopes. Until mow I never gave it a though.

I was fortunate that I had a mentor who used to work in the Metrology department and in the Instrument Repair and Calibration department for the large company where I was. He loved Tek scopes and he taught me everything he knew about them. He instilled a sense of awe in me for the engineering excellence of that company and their products. Apparently he didn't realize either what that hole plug was for.

Dennis Tillman W7PF

-----Original Message-----
Sent: Saturday, September 09, 2017 9:08 PM
Subject: Re: [TekScopes] What I REALLY Meant....

Ok, but to simply connect the deflection plates to the
600 series CRT would have been inspirational, as that is what Tektronix would have expected you to do.

Why do I say that?

Thousands of tektronix scopes (no one else did it) with that capability kind of tells the tale. It was meant to be.

-Chuck Harris

@walter2 [TekScopes] wrote:
actually, Dennis had it exactly right, my suggestion was to use a
remote monitor (ideally with differential inputs) to replace the dead
577 CRT display. I use this trick all the time to restore HP spectrum
and network analyzers with kaput and irreplaceable CRTs. a single
ended input works fine IF the system already brings out XYZ signals on
the rear apron for use. most applications need the Z input because of
complex blanking issues, especially where on-screen data is involved.

If there's no external video, then you have to go inside, and that
usually works best with differential inputs.

I have used the Tek 600 series displays, the HP 1340A series , and
some Tek 7K scopes. This problem is becoming more acute because many
very good high end systems are nearing end of life due to bad CRTs,
corrupted EPROM contents and so forth. to have a good bag of tricks
to combat this is becoming more and more important. Tek fans have easy
ways to bring their scope collections to bear on these problems.

what I'd REALLY like to find is some kind of stock LCD display system
with XY (at
least) inputs, as this could solve so many requirements. an alternate
would be a VGA or better to XY adaptor to breathe life into all those
garage sale LCD monitors for $10. I keep hoping to find one.

all the best, walter (walter2 -at- sphere.bc.ca) sphere research corp
------------------------------------
Posted by: Chuck Harris <cfharris@...>
------------------------------------

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[Non-text portions of this message have been removed]

Re: What I REALLY Meant....

 

Hi Chuck,

Messing with the Kovar deflection plate pins which come through the glass envelope always makes me nervous. Kovar pins are easy to bend and I am always afraid I will crack the glass when I bend one. I shy away from connecting to deflection plates for this reason.

The only time I ever did this was when I hooked up the 7A21 to the vertical deflection plate pins and I bent one of the pins. I almost had a heart attack. Because the other end of the distributed deflection plates needed a termination network (included inside the 7A21 for safe keeping until needed) there were actually 4 pins that you had to connect to.

By now I have a few more scopes than I did then and I have a couple of dud CRTs that I could practice on so I would be more comfortable doing this. I would still need a good reason to connect direct to the plates of a Tek CRT.

On the other hand your experience with the port on the old Tek scopes is essentially a green light to do this. I wish I was aware of this feature when I was surrounded with 535s, 545s, and 547s. I just checked the 1967 catalog and there, plain as day, is the metal hole plug on the CRT side of these scopes. Until mow I never gave it a though.

I was fortunate that I had a mentor who used to work in the Metrology department and in the Instrument Repair and Calibration department for the large company where I was. He loved Tek scopes and he taught me everything he knew about them. He instilled a sense of awe in me for the engineering excellence of that company and their products. Apparently he didn't realize either what that hole plug was for.

Dennis Tillman W7PF

-----Original Message-----
Sent: Saturday, September 09, 2017 9:08 PM
Subject: Re: [TekScopes] What I REALLY Meant....

Ok, but to simply connect the deflection plates to the
600 series CRT would have been inspirational, as that is what Tektronix would have expected you to do.

Why do I say that?

Thousands of tektronix scopes (no one else did it) with that capability kind of tells the tale. It was meant to be.

-Chuck Harris

@walter2 [TekScopes] wrote:
actually, Dennis had it exactly right, my suggestion was to use a
remote monitor (ideally with differential inputs) to replace the dead
577 CRT display. I use this trick all the time to restore HP spectrum
and network analyzers with kaput and irreplaceable CRTs. a single
ended input works fine IF the system already brings out XYZ signals on
the rear apron for use. most applications need the Z input because of
complex blanking issues, especially where on-screen data is involved.

If there's no external video, then you have to go inside, and that
usually works best with differential inputs.

I have used the Tek 600 series displays, the HP 1340A series , and
some Tek 7K scopes. This problem is becoming more acute because many
very good high end systems are nearing end of life due to bad CRTs,
corrupted EPROM contents and so forth. to have a good bag of tricks
to combat this is becoming more and more important. Tek fans have easy
ways to bring their scope collections to bear on these problems.

what I'd REALLY like to find is some kind of stock LCD display system
with XY (at
least) inputs, as this could solve so many requirements. an alternate
would be a VGA or better to XY adaptor to breathe life into all those
garage sale LCD monitors for $10. I keep hoping to find one.

all the best, walter (walter2 -at- sphere.bc.ca) sphere research corp
------------------------------------
Posted by: Chuck Harris <cfharris@...>
------------------------------------

Re: What I REALLY Meant....

Chuck Harris
 

Ok, but to simply connect the deflection plates to the
600 series CRT would have been inspirational, as that
is what Tektronix would have expected you to do.

Why do I say that?

Thousands of tektronix scopes (no one else did it) with
that capability kind of tells the tale. It was meant to
be.

-Chuck Harris

@walter2 [TekScopes] wrote:

actually, Dennis had it exactly right, my suggestion was to use a remote monitor
(ideally with differential inputs) to replace the dead 577 CRT display. I use
this trick all the time to restore HP spectrum and network analyzers with kaput
and irreplaceable CRTs. a single ended input works fine IF the system already
brings out XYZ signals on the rear apron for use. most applications need the Z
input because of complex blanking issues, especially where on-screen data is
involved.

If there's no external video, then you have to go inside, and that usually works
best with differential inputs.

I have used the Tek 600 series displays, the HP 1340A series , and some Tek 7K
scopes. This problem is becoming more acute because many very good high end
systems are nearing end of life due to bad CRTs, corrupted EPROM contents and so
forth. to have a good bag of tricks to combat this is becoming more and more
important. Tek fans have easy ways to bring their scope collections to bear on
these problems.

what I'd REALLY like to find is some kind of stock LCD display system with XY (at
least) inputs, as this could solve so many requirements. an alternate would be a
VGA or better to XY adaptor to breathe life into all those garage sale LCD
monitors for $10. I keep hoping to find one.

all the best, walter (walter2 -at- sphere.bc.ca) sphere research corp



Re: Tek 465 external trigger input cap substitute?

EB4APL
 

I uploaded the picture to the photos section. It is on my album "EB4APL".


El 09/09/2017 a las 20:32, 'Colin Herbert'
colingherbert@... [TekScopes] escribi:

Hi Ignacio,

I don't know personally about Artek manuals, but I have heard good
things in
general about Dave's manuals. I tend to try to get original paper Tek
manuals if I can.

Your picture didn't come through as you thought it might not, as the Group
doesn't allow attachments. You have to post pictures, etc., separately. If
someone has a photograph of where one of these capacitors is normally
situated, I think that would be useful.

I have manuals (original Tek) for 464, 465, 465B and 466 and there isn't a
schematic showing this capacitor in any of them, other than the change
in my
465 manual. Having said that, my 464 manual has a decent partial photo of
the A5 Trigger Generator and Sweep Logic board and it can be seen
where such
a capacitor could be soldered between the "hot" connector of BNC J600
and a
suitable ground point fairly easily.

While C602 doesn't appear generally to be installed on these scopes until
later versions, Tek must surely have had the idea in mind, otherwise why
would they have missed out a C602 in the parts list? There are instances
where a TV sync separator option was offered where C602 was included, as
well as the later modifications.

I have trawled around the web a bit and have found that the sources
are few
and far between for 2.7 pF, 200V caps, but lower voltage (63V) is
commoner.
Neither Sphere nor Qservice list this part number, unfortunately.
Frankly, I
would probably just do without it at present and if a suitable item
turns up
sometime in the future, get it and fit it.

Colin.





[Non-text portions of this message have been removed]

Still want a Tek 5030 or 5031 scope...

 

Anybody got one? Happy to buy or swap as needed to get a good one, but my budget is not as vast as the $2500 ebay price for a broken RM5030 at the moment.


any help appreciated!
all the best,
walter (walter2 -at- sphere.bc.ca)
sphere research corp.

What I REALLY Meant....

 

actually, Dennis had it exactly right, my suggestion was to use a remote monitor (ideally with differential inputs) to replace the dead 577 CRT display. I use this trick all the time to restore HP spectrum and network analyzers with kaput and irreplaceable CRTs. a single ended input works fine IF the system already brings out XYZ signals on the rear apron for use. most applications need the Z input because of complex blanking issues, especially where on-screen data is involved.

If there's no external video, then you have to go inside, and that usually works best with differential inputs.

I have used the Tek 600 series displays, the HP 1340A series , and some Tek 7K scopes. This problem is becoming more acute because many very good high end systems are nearing end of life due to bad CRTs, corrupted EPROM contents and so forth. to have a good bag of tricks to combat this is becoming more and more important. Tek fans have easy ways to bring their scope collections to bear on these problems.

what I'd REALLY like to find is some kind of stock LCD display system with XY (at least) inputs, as this could solve so many requirements. an alternate would be a VGA or better to XY adaptor to breathe life into all those garage sale LCD monitors for $10. I keep hoping to find one.

all the best,
walter (walter2 -at- sphere.bc.ca)
sphere research corp

Re: 11302a in the Bay Area

Jerry
 

I'm still looking for an 11301 or 11302 with or without the 'A' model designation in the Sn Francisco Bay or Sacramento area.

Re: 465M Power Supply Problems

n4buq
 

Part came in today and I installed it and reassembled the scope. Nice clean, crisp trace. Pretty pleased with it.

Thanks for all the help and advice.

Barry - N4BUQ

----- Original Message -----
From: "Barry" <n4buq@...>
To: TekScopes@...
Sent: Thursday, September 7, 2017 9:28:25 AM
Subject: Re: [TekScopes] 465M Power Supply Problems

I decided to go ahead and order the exact replacement since it was available.
I could have gotten a 1.5 mH for about half that (from eBay). Lots of
selections from Mouser, et. al., but by the time shipping is figured in,
it's almost a wash.

I kept thinking that the designers had the other values they could have
selected from but ultimately went with 1.8 mH (could have been technical,
could have been cost, could have been whatever) but given that they chose
that value, I decided to replace it with the same value if possible.

I could get philosophical and say that this will teach me to be more careful,
etc., but that's probably not going to happen. It was just one of those
flukey things. The wire was exposed in just the right place (across the
face of the coil), the PC board tapped it in just the right way, etc.

Hopefully, when I get this part in place, the scope will at least give me a
clean trace and I can move on.

Thanks again,
Barry - N4BUQ

----- Original Message -----
From: "David @DWH [TekScopes]" <TekScopes@...>
To: TekScopes@...
Sent: Thursday, September 7, 2017 8:40:13 AM
Subject: Re: [TekScopes] 465M Power Supply Problems

My 465M schematic is not very good so I use the 455 schematic which
obviously has an error. Huh, my 465M schematic shows the same error.

Anyway like I said, any of the close values will work practically as
well. The output from the transformer is a sine wave so the only
thing to filter is the fundamental (about 45 kHz) after half wave
rectification and not any harmonics which would be present in a
switching output. That means that the inductance has to be high
compared to the filtering inductance at the output of a switching
power supply or the inductance in a decoupling network or it will not
do anything.

At that price, I would buy a 1.5mH or 2.2mH part if they were cheaper.
The things to watch out for are maximum DC current and self resonate
frequency.

https://goo.gl/uJmkr8

On Tue, 5 Sep 2017 08:15:19 -0400 (EDT), you wrote:

The schematic shows 1.8 mH and the part number referenced is 70F183AI
which,
according to what I'm finding, is a 1.8 mH choke.

The part that came out had brown, gray, and orange dots which agrees with
the 183 in the part number and I assume means 1.8 x 10^-3 H.

I finally found an exact replacement for $8.70 shipped so not too terribly
bad if I can't find it cheaper.

Thanks,
Barry - N4BUQ

Re: Tek 465 external trigger input cap substitute?

 

What was wrong with the ones "Surplus Sales of Nebraska" had? Not dog-bone,
but right value and voltage rating.

Dave

-----Original Message-----
From: TekScopes@... [mailto:TekScopes@...]
Sent: 09 September 2017 19:32
To: TekScopes@...
Subject: Re: [TekScopes] Tek 465 external trigger input cap substitute?

Hi Ignacio,



I don't know personally about Artek manuals, but I have heard good things in
general about Dave's manuals. I tend to try to get original paper Tek
manuals if I can.



Your picture didn't come through as you thought it might not, as the Group
doesn't allow attachments. You have to post pictures, etc., separately. If
someone has a photograph of where one of these capacitors is normally
situated, I think that would be useful.



I have manuals (original Tek) for 464, 465, 465B and 466 and there isn't a
schematic showing this capacitor in any of them, other than the change in my
465 manual. Having said that, my 464 manual has a decent partial photo of
the A5 Trigger Generator and Sweep Logic board and it can be seen where such
a capacitor could be soldered between the "hot" connector of BNC J600 and a
suitable ground point fairly easily.



While C602 doesn't appear generally to be installed on these scopes until
later versions, Tek must surely have had the idea in mind, otherwise why
would they have missed out a C602 in the parts list? There are instances
where a TV sync separator option was offered where C602 was included, as
well as the later modifications.



I have trawled around the web a bit and have found that the sources are few
and far between for 2.7 pF, 200V caps, but lower voltage (63V) is commoner.
Neither Sphere nor Qservice list this part number, unfortunately. Frankly, I
would probably just do without it at present and if a suitable item turns up
sometime in the future, get it and fit it.



Colin.







------------------------------------
Posted by: "Colin Herbert" <colingherbert@...>
------------------------------------


------------------------------------

Yahoo Groups Links

Re: Tek 465 external trigger input cap substitute?

Colin Herbert
 

Hi Ignacio,



I don't know personally about Artek manuals, but I have heard good things in
general about Dave's manuals. I tend to try to get original paper Tek
manuals if I can.



Your picture didn't come through as you thought it might not, as the Group
doesn't allow attachments. You have to post pictures, etc., separately. If
someone has a photograph of where one of these capacitors is normally
situated, I think that would be useful.



I have manuals (original Tek) for 464, 465, 465B and 466 and there isn't a
schematic showing this capacitor in any of them, other than the change in my
465 manual. Having said that, my 464 manual has a decent partial photo of
the A5 Trigger Generator and Sweep Logic board and it can be seen where such
a capacitor could be soldered between the "hot" connector of BNC J600 and a
suitable ground point fairly easily.



While C602 doesn't appear generally to be installed on these scopes until
later versions, Tek must surely have had the idea in mind, otherwise why
would they have missed out a C602 in the parts list? There are instances
where a TV sync separator option was offered where C602 was included, as
well as the later modifications.



I have trawled around the web a bit and have found that the sources are few
and far between for 2.7 pF, 200V caps, but lower voltage (63V) is commoner.
Neither Sphere nor Qservice list this part number, unfortunately. Frankly, I
would probably just do without it at present and if a suitable item turns up
sometime in the future, get it and fit it.



Colin.

Re: Tek 465 external trigger input cap substitute?

EB4APL
 

Hi Marco,

The capacitor is a 2.7 pF, 200 V tubular ceramic. These capacitors were
very popular when these scopes were manufactured and also were
extensively used in all classes of radio equipment such as home
receivers and TV sets. I think that they predate the disc types. As
others have noted, it is part of a frequency compensation circuit and
not too much critical. As has been noted also, it can be directly
soldered to the coax connector.

I attach a very clear picture of just this part of the schematic, if the
group does not allow attachments let me know and I'll sent it directly.

And a tip:  do yourself a favor and buy a pdf copy of the manual from
Artek Manuals (http://artekmanuals.com). They are excellent and the
price is very affordable.

I don't have any relation, etc. , just a very satisfied customer of
Dave, which is also a member of the group.

Regards,

Ignacio, EB4APL


El 09/09/2017 a las 18:06, 'David C. Partridge'
@perdrix [TekScopes] escribió:

I think it is probably wired directly from the centre pin on the BNC
to ground.

-----Original Message-----
From: TekScopes@... [mailto:TekScopes@...]
Sent: 09 September 2017 14:28
To: TekScopes@...
Subject: RE: [TekScopes] Tek 465 external trigger input cap substitute?

Hi Marco, Fabio,

I think I also have this pdf service manual, too. I agree that C602 is
mentioned in the components list, as Fabio says. It was manufactured
by Erie Technological Products and has the manufacturer’s part number
of 374-001COJ027C (I may have misread various zeroes and capital Os).
The PITA, as far as I can tell, is that the diagrams don’t show where
this capacitor should be located. There is no diagram for the A11
board and all those for the A8 board (which is where C602 should be
associated, according to the text in my paper manual) seem to be
unrevised ones, not showing C602, nor listing it in the components on
the A8 board. This looks like an oversight by Tek.

I have to say that this particular pdf is not one of the best I have
seen – text is sometimes rather difficult to make out. I much prefer
the original Tek manuals, not only because they are more easily read,
but also because they are easier to find things in and you can use the
multi-page fold-outs as they are meant to be used.

Colin.

From: TekScopes@... [mailto:TekScopes@...]
Sent: 09 September 2017 13:36
To: TekScopes@...
Subject: RE: [TekScopes] Tek 465 external trigger input cap substitute?

Hi Marco,
I have a PDF copy of the 465 service manual for serial number B250000
& up and in this manual, C602 is listed along with all the consecutive
parts.
Indeed, as Colin noted, it's C602 and not C601 you're talking about,
and it's a 2.7pF x 200V ceramic disc capacitor.
Rgrds,
Fabio

On Sep 9, 2017 9:00 AM, "'Colin Herbert'
colingherbert@... [TekScopes]"
<TekScopes@...> wrote:



Hi,

I don't own a 465, but I do have a service manual for it. This
document doesn't have any mention of C602 in the parts list or on the
circuit diagram at all, but does inform us that C601, which is
associated with the Line Trig Signal, not the 'A' Ext Signal, was
changed from 0.01uF ceramic, 150V, to 0.1uF ceramic, 100V at scope SN
# B010400.

In the "Change Information" section, for scopes SN #120000-up, C602
gets added, together with some other stuff. It is placed between the
signal connection of J600 (the 'A' EXT (TRIG)) and ground, before
R602. This component has the Tek part number 281-0611-00 and is 2.7
pF, ceramic, 200V.
To me, it looks as though you could live without it.

These changes were made when the A11 Trigger View circuit board was
removed and the circuitry was incorporated into the A8 Trigger
Generator & Sweep Logic circuit board.

I hope this helps.

Colin.

From: TekScopes@... [mailto:TekScopes@...]
Sent: 09 September 2017 11:13
To: TekScopes@...
Subject: [TekScopes] Tek 465 external trigger input cap substitute?

Hello there!

While removing the trigger board I have broken the "A trigger"
external input cap.
I'm pretty sure that the broken one was marked "500" and it's ceramic,
but I cannot find it on the manual.
In the schematic it seems to be the C601 with value 2.7.. (2.7 what,
pico?) but on the layout it's missing.
After watching some photos on the Internet it looks like mine was
substituted, since they look like a big resistor with a concentric hole.

Have you got any suggestion on what sort of cap should I replace it
with?
Thank you very much!

[Non-text portions of this message have been removed]

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[Non-text portions of this message have been removed]

------------------------------------
Posted by: "Colin Herbert" <colingherbert@...>
------------------------------------

------------------------------------

Yahoo Groups Links



[Non-text portions of this message have been removed]

Re: Tek 465 external trigger input cap substitute?

 

I think it is probably wired directly from the centre pin on the BNC to ground.

-----Original Message-----
From: TekScopes@... [mailto:TekScopes@...]
Sent: 09 September 2017 14:28
To: TekScopes@...
Subject: RE: [TekScopes] Tek 465 external trigger input cap substitute?

Hi Marco, Fabio,



I think I also have this pdf service manual, too. I agree that C602 is mentioned in the components list, as Fabio says. It was manufactured by Erie Technological Products and has the manufacturer’s part number of 374-001COJ027C (I may have misread various zeroes and capital Os). The PITA, as far as I can tell, is that the diagrams don’t show where this capacitor should be located. There is no diagram for the A11 board and all those for the A8 board (which is where C602 should be associated, according to the text in my paper manual) seem to be unrevised ones, not showing C602, nor listing it in the components on the A8 board. This looks like an oversight by Tek.



I have to say that this particular pdf is not one of the best I have seen – text is sometimes rather difficult to make out. I much prefer the original Tek manuals, not only because they are more easily read, but also because they are easier to find things in and you can use the multi-page fold-outs as they are meant to be used.



Colin.



From: TekScopes@... [mailto:TekScopes@...]
Sent: 09 September 2017 13:36
To: TekScopes@...
Subject: RE: [TekScopes] Tek 465 external trigger input cap substitute?





Hi Marco,
I have a PDF copy of the 465 service manual for serial number B250000 & up and in this manual, C602 is listed along with all the consecutive parts.
Indeed, as Colin noted, it's C602 and not C601 you're talking about, and it's a 2.7pF x 200V ceramic disc capacitor.
Rgrds,
Fabio

On Sep 9, 2017 9:00 AM, "'Colin Herbert' colingherbert@... [TekScopes]" <TekScopes@...> wrote:



Hi,

I don't own a 465, but I do have a service manual for it. This
document doesn't have any mention of C602 in the parts list or on the
circuit diagram at all, but does inform us that C601, which is
associated with the Line Trig Signal, not the 'A' Ext Signal, was
changed from 0.01uF ceramic, 150V, to 0.1uF ceramic, 100V at scope SN
# B010400.

In the "Change Information" section, for scopes SN #120000-up, C602
gets added, together with some other stuff. It is placed between the
signal connection of J600 (the 'A' EXT (TRIG)) and ground, before
R602. This component has the Tek part number 281-0611-00 and is 2.7 pF, ceramic, 200V.
To me, it looks as though you could live without it.

These changes were made when the A11 Trigger View circuit board was
removed and the circuitry was incorporated into the A8 Trigger
Generator & Sweep Logic circuit board.

I hope this helps.

Colin.

From: TekScopes@... [mailto:TekScopes@...]
Sent: 09 September 2017 11:13
To: TekScopes@...
Subject: [TekScopes] Tek 465 external trigger input cap substitute?

Hello there!

While removing the trigger board I have broken the "A trigger"
external input cap.
I'm pretty sure that the broken one was marked "500" and it's ceramic,
but I cannot find it on the manual.
In the schematic it seems to be the C601 with value 2.7.. (2.7 what,
pico?) but on the layout it's missing.
After watching some photos on the Internet it looks like mine was
substituted, since they look like a big resistor with a concentric hole.

Have you got any suggestion on what sort of cap should I replace it with?
Thank you very much!

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Posted by: "Colin Herbert" <colingherbert@...>
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