Date   

Re: Some interesting Nuvistor information

greenboxmaven
 

One of the NuVistors used in Tektronix scopes is designed for very low anode voltage, about 30 volts. I have a 423 I got at a hamfest that uses them. One was so weak it was impossible to get the trace on the screen, replacing it brought everything back just fine.

Bruce Gentry, KA2IVY

On 6/15/20 12:44 PM, Dale H. Cook wrote:
On 6/15/2020 12:21 PM, Roy Thistle wrote:

Where any of these used in Tek stuff?
Six 8393s were used in the original release of the Tek 453 in the inputs to both channels and in both trigger generators and both sweep generators. All six were replaced by FETs in the second version of the 453 (serials above 20,000). When Tek introduced the 453 in response to IBM's need for a compact and durable lab-grade 'scope that would fit under an airliner seat the 8393 was a superb choice. Many of us consider the 453 to be the first truly portable lab-grade 'scope.


Re: Building an HV Multiplier for 455/465M

ArtekManuals <manuals@...>
 

The 455/465M use a 3X multiplier but there is no HV output level listed on the schematic or in the circuit description section ( odd)

The 465 Uses a different multiplier but no listing of the multiplier factor on the schematic ...8^(

The 465B uses yet ANOTHER multiplier module than the 455 and the 465 and again no multiplier factor listed on the schematic..

Both the 465 and the 465B have an CRT HV of 14-16KV

Content free data

Dave
manuals@artekmanuals.com

On 6/17/2020 9:27 AM, n4buq wrote:
Is it the same for a 465M as for a 465/465B? I'm thinking they're different but not sure.

Thanks,
Barry - N4BUQ

----- Original Message -----
From: "Reed Dickinson" <reed714@sbcglobal.net>
To: TekScopes@groups.io
Sent: Wednesday, June 17, 2020 1:33:37 AM
Subject: Re: [TekScopes] Building an HV Multiplier for 455/465M

Hi Tom:
I have a large collection of 4XX series scopes and some have been used for
parts.  I have a collection of 3X HV voltage multipliers and I would offer
you a known good one for $25 plus shipping.  Or, I would sell you a good 465
or 465B for $100.  I do not have any 455 scopes but the multiplier is the
same for the 455 and 465.
Reed Dickinson1705 Stonehenge DriveTustin, CA  92780
reed714@sbcglobal.net


On Tuesday, June 16, 2020, 08:57:11 PM PDT, Tom Miller
<tmiller11147@comcast.net> wrote:

It also limits the short circuit current through the diodes in the event
the HV lead comes to ground.


On 6/16/2020 11:04 PM, Chuck Harris wrote:
That is true, but in this case,  normal operation isn't going
to have enough current to present a significant voltage across
the resistor.  It is going to be the same voltage on each end,
floating on top of a whole lot of KV.

The resistor's purpose is manifold:

1) it limits the current that could affect a subject that
    comes across the power supply with charged capacitors.
2) it limits the current charging the CRT's anode capacitance
3) it adds an R component to the inherent RC filter created by
    the anode capacitance.. reducing any flicker induced by the
    supply's ripple.

#1 is probably the most important reason for its being.

-Chuck Harris


Glenn Little wrote:
It is not the wattage as much as the voltage.
Resistors have a voltage rating.

Glenn

On 6/16/2020 5:35 PM, Michael W. Lynch via groups.io wrote:
I have a 455 with a defective HV Multiplier (part of U550).  The
TEKTRONIX
specification calls for a 1 1/2 times multiplier with a "3M Series
Resistance".   I
have built a 1 1/2 times multiplier (that is pretty simple), but am
unsure of how
to properly get that 3M of series resistance?  If this is a simple matter
of
soldering a suitable sized resistor into the Anode lead?  What watt
rating for the
resistor?  I have a 3M Ohm carbon composite resistor, but it is only 1/2
watt.  I'm
afraid this resistor is too small to do the job.  I suppose I just do not
completely understand the principals involved?   How to get the right
answer is the
bigger question?
--
This email has been checked for viruses by Avast antivirus software.
https://www.avast.com/antivirus







--
Dave
Manuals@ArtekManuals.com
www.ArtekManuals.com


Re: Large equipment Auction (UK)

Tom Gardner
 

On 17/06/20 14:29, toby@telegraphics.com.au wrote:
May be interesting to group members especially those located in UK:

https://www.ppauctions.com/auction/294/june-collective-sale

Note registration is required to bid so move quickly as that takes time.
And don't forget to either visit and pick it up, or to investigate the pack and send costs before you visit. PPAuctions does not pack and send (Ramco does).


Large equipment Auction (UK)

toby@...
 

May be interesting to group members especially those located in UK:

https://www.ppauctions.com/auction/294/june-collective-sale

Note registration is required to bid so move quickly as that takes time.

--Toby
(no affiliation)


Re: Building an HV Multiplier for 455/465M

n4buq
 

Is it the same for a 465M as for a 465/465B? I'm thinking they're different but not sure.

Thanks,
Barry - N4BUQ

----- Original Message -----
From: "Reed Dickinson" <reed714@sbcglobal.net>
To: TekScopes@groups.io
Sent: Wednesday, June 17, 2020 1:33:37 AM
Subject: Re: [TekScopes] Building an HV Multiplier for 455/465M

Hi Tom:
I have a large collection of 4XX series scopes and some have been used for
parts.  I have a collection of 3X HV voltage multipliers and I would offer
you a known good one for $25 plus shipping.  Or, I would sell you a good 465
or 465B for $100.  I do not have any 455 scopes but the multiplier is the
same for the 455 and 465.
Reed Dickinson1705 Stonehenge DriveTustin, CA  92780
reed714@sbcglobal.net


On Tuesday, June 16, 2020, 08:57:11 PM PDT, Tom Miller
<tmiller11147@comcast.net> wrote:

It also limits the short circuit current through the diodes in the event
the HV lead comes to ground.


On 6/16/2020 11:04 PM, Chuck Harris wrote:
That is true, but in this case,  normal operation isn't going
to have enough current to present a significant voltage across
the resistor.  It is going to be the same voltage on each end,
floating on top of a whole lot of KV.

The resistor's purpose is manifold:

1) it limits the current that could affect a subject that
    comes across the power supply with charged capacitors.
2) it limits the current charging the CRT's anode capacitance
3) it adds an R component to the inherent RC filter created by
    the anode capacitance.. reducing any flicker induced by the
    supply's ripple.

#1 is probably the most important reason for its being.

-Chuck Harris


Glenn Little wrote:
It is not the wattage as much as the voltage.
Resistors have a voltage rating.

Glenn

On 6/16/2020 5:35 PM, Michael W. Lynch via groups.io wrote:
I have a 455 with a defective HV Multiplier (part of U550).  The
TEKTRONIX
specification calls for a 1 1/2 times multiplier with a "3M Series
Resistance".   I
have built a 1 1/2 times multiplier (that is pretty simple), but am
unsure of how
to properly get that 3M of series resistance?  If this is a simple matter
of
soldering a suitable sized resistor into the Anode lead?  What watt
rating for the
resistor?  I have a 3M Ohm carbon composite resistor, but it is only 1/2
watt.  I'm
afraid this resistor is too small to do the job.  I suppose I just do not
completely understand the principals involved?   How to get the right
answer is the
bigger question?
--
This email has been checked for viruses by Avast antivirus software.
https://www.avast.com/antivirus








Re: What is this plastic dingus called?

snapdiode
 

Thanks, guess I should look at the mechanical diagrams more closely.
Can't find this part anywhere, it's not preventing the pot from working, it's just a little annoying.


Re: What is this plastic dingus called?

Kurt Rosenfeld
 

Tek part number 352-0100-00 is described on page 9-76 of this document:
http://w140.com/tekwiki/images/1/18/Tektronix_Common_Design_Parts_Mechanical_Catalog_2_nov_1988_ocr.pdf


Re: DSA 602 "partial enhanced accuracy" at each startup

Egge Siert
 

Hi,

And David DiGiacomo's DSA602A with FW 2.23 does it also!! Maybe it is SN (thus Board PN) dependent? By the way I can live with it. After 20 minutes you also must start the EA procedure for maximum accuracy.

Greetings,

Egge Siert


Re: What is this plastic dingus called?

Albert Otten
 

I found that knowing the part number 352-0100-00 and "holder" didn't help when searching for a replacement. In some instruments the trimpots are mounted on a "stand-off" but that search term also gave no useful hits.
Albert


Re: What is this plastic dingus called?

Albert Otten
 

Well, the original question at eevblog says it's form a 1S2, so look at the Mechanical Parts List and Figures in the manual.
I think these will be 352-0100-00 "Holder, variable resistor", as in Fig 3-39.

Albert

On Wed, Jun 17, 2020 at 01:36 PM, J. L. Trantham wrote:


Don't know what they are called but they look like a 'cable clip' for routing
cables.

Joe

-----Original Message-----
From: TekScopes@groups.io [mailto:TekScopes@groups.io] On Behalf Of snapdiode
via groups.io
Sent: Tuesday, June 16, 2020 10:50 PM
To: TekScopes@groups.io
Subject: [TekScopes] What is this plastic dingus called?

The little plastic clips that hold the 6mm diameter trimpots?
https://www.eevblog.com/forum/projects/what-is-this-plastic-dingus-called/?action=dlattach;attach=1004032




Re: What is this plastic dingus called?

Brad Thompson
 

J. L. Trantham wrote on 6/17/2020 7:36 AM:
Don't know what they are called but they look like a 'cable clip' for routing cables.

Hello--
They're likely part of a group of parts called "Transipads" (tm)

http://microdimensional.com/

73==

Brad AA1IP


Re: What is this plastic dingus called?

J. L. Trantham
 

Don't know what they are called but they look like a 'cable clip' for routing cables.

Joe

-----Original Message-----
From: TekScopes@groups.io [mailto:TekScopes@groups.io] On Behalf Of snapdiode via groups.io
Sent: Tuesday, June 16, 2020 10:50 PM
To: TekScopes@groups.io
Subject: [TekScopes] What is this plastic dingus called?

The little plastic clips that hold the 6mm diameter trimpots?
https://www.eevblog.com/forum/projects/what-is-this-plastic-dingus-called/?action=dlattach;attach=1004032


Re: Scope carts

Henry Feng
 

Check this utility cart out on amazon, it's 34"x 18", heavy duty with wheels, it can hold DSA and CSA series scopes, Only $70
Seville Classics 3-Tier UltraDurable Commercial-Grade NSF Listed Service Utility Cart Shelving with Wheels, 34" W x 18" D


Re: Scope carts

Steve Wiseman
 

I've had two DSA602s on top of one of mine, with no concerns at all
(Anything to avoid wrangling a 602 onto a bench, they're >30kg and quite
big...) That sloping one I posted is much flimsier than usual, it's just
bent 1.2mm? sheet, but proper racks have borderline girders inside, and
castors to cope with a rack full of servers and a UPS.
Even the flimsy ones are pretty sturdy, and they stiffen up further with a
couple of shelves bolted to front & back rails.

Obviously, shipping racks is even worse than shipping proper scope carts,
but they may be easier to source locally.


Re: A nice 1S1-related document

um-gs@...
 

Dave,
thanks a lot for bringing this to attention!
I only own 1 (and a replacement parts spare) 1S1, but as I am currently calibrating it, this interesting stuff comes very handy. I also browsed the w140.com/tekwiki a lot but never discovered this treasure.

Gordian


Re: AM700

 

Hi Giampi,

Finally I have found a flash simm for my AM700. I'am being build an adapter from my programmer ( a GQ-4X) to simm module but I have some trouble with RW / CS/ and OE signal. When you have build your adapter were you have connect this signals? What type of programmer you used to read your simm?

Best Regards.

Juri


Re: Building an HV Multiplier for 455/465M

Reed Dickinson
 

Hi Tom:
I have a large collection of 4XX series scopes and some have been used for parts.  I have a collection of 3X HV voltage multipliers and I would offer you a known good one for $25 plus shipping.  Or, I would sell you a good 465 or 465B for $100.  I do not have any 455 scopes but the multiplier is the same for the 455 and 465.
Reed Dickinson1705 Stonehenge DriveTustin, CA  92780
reed714@sbcglobal.net

On Tuesday, June 16, 2020, 08:57:11 PM PDT, Tom Miller <tmiller11147@comcast.net> wrote:

It also limits the short circuit current through the diodes in the event
the HV lead comes to ground.


On 6/16/2020 11:04 PM, Chuck Harris wrote:
That is true, but in this case,  normal operation isn't going
to have enough current to present a significant voltage across
the resistor.  It is going to be the same voltage on each end,
floating on top of a whole lot of KV.

The resistor's purpose is manifold:

1) it limits the current that could affect a subject that
    comes across the power supply with charged capacitors.
2) it limits the current charging the CRT's anode capacitance
3) it adds an R component to the inherent RC filter created by
    the anode capacitance.. reducing any flicker induced by the
    supply's ripple.

#1 is probably the most important reason for its being.

-Chuck Harris


Glenn Little wrote:
It is not the wattage as much as the voltage.
Resistors have a voltage rating.

Glenn

On 6/16/2020 5:35 PM, Michael W. Lynch via groups.io wrote:
I have a 455 with a defective HV Multiplier (part of U550).  The TEKTRONIX
specification calls for a 1 1/2 times multiplier with a "3M Series Resistance".   I
have built a 1 1/2 times multiplier (that is pretty simple), but am unsure of how
to properly get that 3M of series resistance?  If this is a simple matter of
soldering a suitable sized resistor into the Anode lead?  What watt rating for the
resistor?  I have a 3M Ohm carbon composite resistor, but it is only 1/2 watt.  I'm
afraid this resistor is too small to do the job.  I suppose I just do not
completely understand the principals involved?   How to get the right answer is the
bigger question?
--
This email has been checked for viruses by Avast antivirus software.
https://www.avast.com/antivirus


Re: A nice 1S1-related document

Dave Wise
 

That's great material. Thanks to whoever uploaded it.

It refers to a couple of mod kits for early 530/540 mainframes, which I'd like to apply. Does anybody know what 040-0403-00 and 040-0404-00 are?

Dave Wise
________________________________________
From: TekScopes@groups.io <TekScopes@groups.io> on behalf of snapdiode via groups.io <snapdiode=yahoo.com@groups.io>
Sent: Tuesday, June 16, 2020 7:46 PM
To: TekScopes@groups.io
Subject: [TekScopes] A nice 1S1-related document

Maybe you already all know about this document but it's the first time I've noticed it. And I have four 1S1s!

http://w140.com/tekwiki/images/f/f7/Tek_1s1_field_training_package.pdf


Re: What is this plastic dingus called?

J Mcvein
 

Momma called it a potholder.
1967 was a high point in tek's vertical production history :)
-J-

-----Original Message-----
From: "snapdiode via groups.io" <snapdiode=yahoo.com@groups.io>
Sent: Tuesday, June 16, 2020 11:49pm
To: TekScopes@groups.io
Subject: [TekScopes] What is this plastic dingus called?



The little plastic clips that hold the 6mm diameter trimpots?
https://www.eevblog.com/forum/projects/what-is-this-plastic-dingus-called/?action=dlattach;attach=1004032


Re: Building an HV Multiplier for 455/465M

 

It also limits the short circuit current through the diodes in the event the HV lead comes to ground.

On 6/16/2020 11:04 PM, Chuck Harris wrote:
That is true, but in this case, normal operation isn't going
to have enough current to present a significant voltage across
the resistor. It is going to be the same voltage on each end,
floating on top of a whole lot of KV.

The resistor's purpose is manifold:

1) it limits the current that could affect a subject that
comes across the power supply with charged capacitors.
2) it limits the current charging the CRT's anode capacitance
3) it adds an R component to the inherent RC filter created by
the anode capacitance.. reducing any flicker induced by the
supply's ripple.

#1 is probably the most important reason for its being.

-Chuck Harris


Glenn Little wrote:
It is not the wattage as much as the voltage.
Resistors have a voltage rating.

Glenn

On 6/16/2020 5:35 PM, Michael W. Lynch via groups.io wrote:
I have a 455 with a defective HV Multiplier (part of U550).  The TEKTRONIX
specification calls for a 1 1/2 times multiplier with a "3M Series Resistance".   I
have built a 1 1/2 times multiplier (that is pretty simple), but am unsure of how
to properly get that 3M of series resistance?  If this is a simple matter of
soldering a suitable sized resistor into the Anode lead?  What watt rating for the
resistor?  I have a 3M Ohm carbon composite resistor, but it is only 1/2 watt.  I'm
afraid this resistor is too small to do the job.  I suppose I just do not
completely understand the principals involved?   How to get the right answer is the
bigger question?
--
This email has been checked for viruses by Avast antivirus software.
https://www.avast.com/antivirus

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