Date   

Re: Tektronix Neon Light replacement parts?

Dan Cordova <danny_cordov@...>
 

I can get the NE-23 bulbs, so that's what I will replace them with, especially since that's what's on the schematic.
Thanks for the help.
Dan

On Thursday, January 24, 2019, 11:11:44 AM PST, Dave Wise <david_wise@phoenix.com> wrote:

Tek 500-series scope applications of neon lamps are typically as voltage limiters, not references or multivibrators.  Circuit voltage can rise to the strike voltage before the lamp begins to limit.

I don't know whether the 575 also uses its lamps as limiters, but I expect that it does.  Sorry, don't have time to study the schematics.  I'm sure many others here know it better than me.

Dave Wise
________________________________________
From: TekScopes@groups.io <TekScopes@groups.io> on behalf of Dan Cordova via Groups.Io <danny_cordov=yahoo.com@groups.io>
Sent: Thursday, January 24, 2019 11:01 AM
To: TekScopes@groups.io
Subject: Re: [TekScopes] Tektronix Neon Light replacement parts?

While I appreciate the help, this talk about strike voltage confuses me.
I'm not sure what the two neon lamps that I broke the leads are B826 and B827, listed as NE-23, are used for strike voltage?
There are several other neon lamps in different circuits on this curve tracer. I thought they were there to show that voltage and current were running through that part of the circuit.
Dan
    On Thursday, January 24, 2019, 8:45:48 AM PST, Dave Wise <david_wise@phoenix.com> wrote:

I investigated this when I was exploring repairs for my HP 141T A2V1 ZZ1000 voltage reference glow tube.  Illuminating an NE-2 reduced the strike time much more than the strike voltage.  I tried several lamps and all did the same.

Illuminating the VR tube did neither enough to be useful.  I replaced it with a TL431/zener combo, see https://groups.io/g/HP-Agilent-Keysight-equipment/album?id=68333 .

Dave Wise
________________________________________
From: TekScopes@groups.io <TekScopes@groups.io> on behalf of Chuck Harris <cfharris@erols.com>
Sent: Wednesday, January 23, 2019 7:07 PM
To: TekScopes@groups.io
Subject: Re: [TekScopes] Tektronix Neon Light replacement parts?

I shouldn't think it would be all that difficult
to test the strike voltage in various ambient lighting
conditions, both with and without the blue led...

-Chuck Harris


Re: Tektronix Neon Light replacement parts?

David DiGiacomo
 

If you look at the manual on BAMA, B826 and B827 are limiting the
voltage across the intensity pot. I can't tell if they are on in
normal operation. Usually Tek didn't do that.

In this version of the manual, they are listed as NE-2, so Dan should
feel free to try any old neon bulbs.


Re: Tektronix Neon Light replacement parts?

Harvey White
 

On Thu, 24 Jan 2019 19:01:23 +0000 (UTC), you wrote:

While I appreciate the help, this talk about strike voltage confuses me.
I'm not sure what the two neon lamps that I broke the leads are B826 and B827, listed as NE-23, are used for strike voltage?
There are several other neon lamps in different circuits on this curve tracer. I thought they were there to show that voltage and current were running through that part of the circuit.
There's two ways of using a neon lamp. One is a simple indicator to
show that there is voltage or current. Typically, about 1.2 ma or so
goes through the lamp (120 volts/100K or so ohms). The NE2H varieties
take about twice the current and are brighter (H = high brightness).

The other way is to use it much like a zener, that is, to limit the
voltage differential between two points in a circuit. When the lamp
fires (the strike voltage), it starts to conduct, which causes current
to go through it, limiting the voltage to what's called the
"maintaining voltage". The maintaining voltage is lower than the
strike voltage.

Supposedly, the temporary overvoltage condition goes away, voltage
across the lamp goes below the maintaining voltage, and the circuit is
protected.

A zener diode works just about the same way, but is more stable, and
has effectively tighter tolerances.

Harvey



Dan
On Thursday, January 24, 2019, 8:45:48 AM PST, Dave Wise <david_wise@phoenix.com> wrote:

I investigated this when I was exploring repairs for my HP 141T A2V1 ZZ1000 voltage reference glow tube.  Illuminating an NE-2 reduced the strike time much more than the strike voltage.  I tried several lamps and all did the same.

Illuminating the VR tube did neither enough to be useful.  I replaced it with a TL431/zener combo, see https://groups.io/g/HP-Agilent-Keysight-equipment/album?id=68333 .

Dave Wise
________________________________________
From: TekScopes@groups.io <TekScopes@groups.io> on behalf of Chuck Harris <cfharris@erols.com>
Sent: Wednesday, January 23, 2019 7:07 PM
To: TekScopes@groups.io
Subject: Re: [TekScopes] Tektronix Neon Light replacement parts?

I shouldn't think it would be all that difficult
to test the strike voltage in various ambient lighting
conditions, both with and without the blue led...

-Chuck Harris

Harvey White wrote:
On Thu, 24 Jan 2019 01:09:54 +0000 (UTC), you wrote:

What about plain NE-2's and 1 or more blue led's shining on it?
Not sure what this would do for accuracy of strike voltage.  Ought to
lower it, though.  No idea if it would stay constant, either.

(have a power strip with the usual flickering neons, UV light or blue
light and they go on....)

Harvey



Leon Robinson    K5JLR

Political Correctness is a Political Disease.
Politicians and Diapers should be changed
often and for the same reasons.

    On Wednesday, January 23, 2019, 6:30:01 PM CST, Dan Cordova via Groups.Io <danny_cordov=yahoo.com@groups.io> wrote:

  Hi David,
Thank you for your prompt reply!
I found the lamps on the schematic and ordered some.
Once these are installed, the curve tracer should be back in working order. I found three paper caps that were bad and replaced them.
Speaking of radiation- I have a EG&G KN-2 tube that has Ni-63. It is a radioactive isotope of nickel, half life of  101 years, emits beta particles (when functioning). It was used for triggering a laser.
I'm retired from Sandia National Laboratories after 30+ years, don't glow at night, and haven't suffered any ill effects (yet) from soldering with Sn/Pb solder.
Thanks again for the info.
Dan




    On Wednesday, January 23, 2019, 4:06:54 PM PST, David Holland <david.w.holland@gmail.com> wrote:

They appear to be NE-23's....  Eg: NE2's + Radioactive gas (that's no
longer radioactive by now) :-)

I'd probably just go with bog standard A1A's, as I don't believe
they're particularly critical (though I did not look).

https://www.mouser.com/ProductDetail/VCC/A1A?qs=sGAEpiMZZMsEIsGLxVc9kJiHZr4x%252btYO

But if you want a little more radiation in your life, and be more
correct I gather they're called 5AB's now.

https://www.mouser.com/ProductDetail/VCC/5AB-BT?qs=oFdBtU78F3wIszsEPQJjcA%3D%3D

(No, I don't think there's any radiation danger, though I don't
recommend huffing a 5AB... :-P  )

David

On Wed, Jan 23, 2019 at 4:08 PM Dan Cordova via Groups.Io
<danny_cordov=yahoo.com@groups.io> wrote:

Hello- while replacing bad capacitors on my Tektronix 575 Curve Tracer, I literally touched a couple of the neon lights and broke the leads.

Is there a replacement part the group can recommend?

The neon lights are useful to show at a glance that the circuit has power, but can the lights be replaced with a wire, or would I need to put a resistor in place?

TIA
Dan



















Re: Tektronix Neon Light replacement parts?

Dave Wise
 

Tek 500-series scope applications of neon lamps are typically as voltage limiters, not references or multivibrators. Circuit voltage can rise to the strike voltage before the lamp begins to limit.

I don't know whether the 575 also uses its lamps as limiters, but I expect that it does. Sorry, don't have time to study the schematics. I'm sure many others here know it better than me.

Dave Wise
________________________________________
From: TekScopes@groups.io <TekScopes@groups.io> on behalf of Dan Cordova via Groups.Io <danny_cordov=yahoo.com@groups.io>
Sent: Thursday, January 24, 2019 11:01 AM
To: TekScopes@groups.io
Subject: Re: [TekScopes] Tektronix Neon Light replacement parts?

While I appreciate the help, this talk about strike voltage confuses me.
I'm not sure what the two neon lamps that I broke the leads are B826 and B827, listed as NE-23, are used for strike voltage?
There are several other neon lamps in different circuits on this curve tracer. I thought they were there to show that voltage and current were running through that part of the circuit.
Dan
On Thursday, January 24, 2019, 8:45:48 AM PST, Dave Wise <david_wise@phoenix.com> wrote:

I investigated this when I was exploring repairs for my HP 141T A2V1 ZZ1000 voltage reference glow tube. Illuminating an NE-2 reduced the strike time much more than the strike voltage. I tried several lamps and all did the same.

Illuminating the VR tube did neither enough to be useful. I replaced it with a TL431/zener combo, see https://groups.io/g/HP-Agilent-Keysight-equipment/album?id=68333 .

Dave Wise
________________________________________
From: TekScopes@groups.io <TekScopes@groups.io> on behalf of Chuck Harris <cfharris@erols.com>
Sent: Wednesday, January 23, 2019 7:07 PM
To: TekScopes@groups.io
Subject: Re: [TekScopes] Tektronix Neon Light replacement parts?

I shouldn't think it would be all that difficult
to test the strike voltage in various ambient lighting
conditions, both with and without the blue led...

-Chuck Harris


Re: Tektronix Neon Light replacement parts?

Dan Cordova <danny_cordov@...>
 

While I appreciate the help, this talk about strike voltage confuses me.
I'm not sure what the two neon lamps that I broke the leads are B826 and B827, listed as NE-23, are used for strike voltage?
There are several other neon lamps in different circuits on this curve tracer. I thought they were there to show that voltage and current were running through that part of the circuit.
Dan

On Thursday, January 24, 2019, 8:45:48 AM PST, Dave Wise <david_wise@phoenix.com> wrote:

I investigated this when I was exploring repairs for my HP 141T A2V1 ZZ1000 voltage reference glow tube.  Illuminating an NE-2 reduced the strike time much more than the strike voltage.  I tried several lamps and all did the same.

Illuminating the VR tube did neither enough to be useful.  I replaced it with a TL431/zener combo, see https://groups.io/g/HP-Agilent-Keysight-equipment/album?id=68333 .

Dave Wise
________________________________________
From: TekScopes@groups.io <TekScopes@groups.io> on behalf of Chuck Harris <cfharris@erols.com>
Sent: Wednesday, January 23, 2019 7:07 PM
To: TekScopes@groups.io
Subject: Re: [TekScopes] Tektronix Neon Light replacement parts?

I shouldn't think it would be all that difficult
to test the strike voltage in various ambient lighting
conditions, both with and without the blue led...

-Chuck Harris

Harvey White wrote:
On Thu, 24 Jan 2019 01:09:54 +0000 (UTC), you wrote:

What about plain NE-2's and 1 or more blue led's shining on it?
Not sure what this would do for accuracy of strike voltage.  Ought to
lower it, though.  No idea if it would stay constant, either.

(have a power strip with the usual flickering neons, UV light or blue
light and they go on....)

Harvey



Leon Robinson    K5JLR

Political Correctness is a Political Disease.
Politicians and Diapers should be changed
often and for the same reasons.

    On Wednesday, January 23, 2019, 6:30:01 PM CST, Dan Cordova via Groups.Io <danny_cordov=yahoo.com@groups.io> wrote:

  Hi David,
Thank you for your prompt reply!
I found the lamps on the schematic and ordered some.
Once these are installed, the curve tracer should be back in working order. I found three paper caps that were bad and replaced them.
Speaking of radiation- I have a EG&G KN-2 tube that has Ni-63. It is a radioactive isotope of nickel, half life of  101 years, emits beta particles (when functioning). It was used for triggering a laser.
I'm retired from Sandia National Laboratories after 30+ years, don't glow at night, and haven't suffered any ill effects (yet) from soldering with Sn/Pb solder.
Thanks again for the info.
Dan




    On Wednesday, January 23, 2019, 4:06:54 PM PST, David Holland <david.w.holland@gmail.com> wrote:

They appear to be NE-23's....  Eg: NE2's + Radioactive gas (that's no
longer radioactive by now) :-)

I'd probably just go with bog standard A1A's, as I don't believe
they're particularly critical (though I did not look).

https://www.mouser.com/ProductDetail/VCC/A1A?qs=sGAEpiMZZMsEIsGLxVc9kJiHZr4x%252btYO

But if you want a little more radiation in your life, and be more
correct I gather they're called 5AB's now.

https://www.mouser.com/ProductDetail/VCC/5AB-BT?qs=oFdBtU78F3wIszsEPQJjcA%3D%3D

(No, I don't think there's any radiation danger, though I don't
recommend huffing a 5AB... :-P  )

David

On Wed, Jan 23, 2019 at 4:08 PM Dan Cordova via Groups.Io
<danny_cordov=yahoo.com@groups.io> wrote:

Hello- while replacing bad capacitors on my Tektronix 575 Curve Tracer, I literally touched a couple of the neon lights and broke the leads.

Is there a replacement part the group can recommend?

The neon lights are useful to show at a glance that the circuit has power, but can the lights be replaced with a wire, or would I need to put a resistor in place?

TIA
Dan












Re: 465 minor repairs - help requested

guy.r.thomas
 

It is a 456B and I am trying to get the photo's to upload. Stay tuned.


Re: Tektronix Neon Light replacement parts?

Dave Wise
 

I investigated this when I was exploring repairs for my HP 141T A2V1 ZZ1000 voltage reference glow tube. Illuminating an NE-2 reduced the strike time much more than the strike voltage. I tried several lamps and all did the same.

Illuminating the VR tube did neither enough to be useful. I replaced it with a TL431/zener combo, see https://groups.io/g/HP-Agilent-Keysight-equipment/album?id=68333 .

Dave Wise
________________________________________
From: TekScopes@groups.io <TekScopes@groups.io> on behalf of Chuck Harris <cfharris@erols.com>
Sent: Wednesday, January 23, 2019 7:07 PM
To: TekScopes@groups.io
Subject: Re: [TekScopes] Tektronix Neon Light replacement parts?

I shouldn't think it would be all that difficult
to test the strike voltage in various ambient lighting
conditions, both with and without the blue led...

-Chuck Harris

Harvey White wrote:
On Thu, 24 Jan 2019 01:09:54 +0000 (UTC), you wrote:

What about plain NE-2's and 1 or more blue led's shining on it?
Not sure what this would do for accuracy of strike voltage. Ought to
lower it, though. No idea if it would stay constant, either.

(have a power strip with the usual flickering neons, UV light or blue
light and they go on....)

Harvey



Leon Robinson K5JLR

Political Correctness is a Political Disease.
Politicians and Diapers should be changed
often and for the same reasons.

On Wednesday, January 23, 2019, 6:30:01 PM CST, Dan Cordova via Groups.Io <danny_cordov=yahoo.com@groups.io> wrote:

Hi David,
Thank you for your prompt reply!
I found the lamps on the schematic and ordered some.
Once these are installed, the curve tracer should be back in working order. I found three paper caps that were bad and replaced them.
Speaking of radiation- I have a EG&G KN-2 tube that has Ni-63. It is a radioactive isotope of nickel, half life of 101 years, emits beta particles (when functioning). It was used for triggering a laser.
I'm retired from Sandia National Laboratories after 30+ years, don't glow at night, and haven't suffered any ill effects (yet) from soldering with Sn/Pb solder.
Thanks again for the info.
Dan




On Wednesday, January 23, 2019, 4:06:54 PM PST, David Holland <david.w.holland@gmail.com> wrote:

They appear to be NE-23's.... Eg: NE2's + Radioactive gas (that's no
longer radioactive by now) :-)

I'd probably just go with bog standard A1A's, as I don't believe
they're particularly critical (though I did not look).

https://www.mouser.com/ProductDetail/VCC/A1A?qs=sGAEpiMZZMsEIsGLxVc9kJiHZr4x%252btYO

But if you want a little more radiation in your life, and be more
correct I gather they're called 5AB's now.

https://www.mouser.com/ProductDetail/VCC/5AB-BT?qs=oFdBtU78F3wIszsEPQJjcA%3D%3D

(No, I don't think there's any radiation danger, though I don't
recommend huffing a 5AB... :-P )

David

On Wed, Jan 23, 2019 at 4:08 PM Dan Cordova via Groups.Io
<danny_cordov=yahoo.com@groups.io> wrote:

Hello- while replacing bad capacitors on my Tektronix 575 Curve Tracer, I literally touched a couple of the neon lights and broke the leads.

Is there a replacement part the group can recommend?

The neon lights are useful to show at a glance that the circuit has power, but can the lights be replaced with a wire, or would I need to put a resistor in place?

TIA
Dan












Re: tektronix 475 help ic part

Roberto
 

ok jim sen me ic
Roberto


Re: tektronix 475 help ic part

Jim Olson <v_12eng@...>
 

I checked the 155 RPR and it shows the 155-0049-01 was replaced with the 155-0049-02 for all applications. The 01C does not show at all but it should be OK as it is in a late 475. RPR listed the price back then at $30.00.

Jim O

On January 22, 2019 at 1:14 PM "Roger Evans via Groups.Io" <very_fuzzy_logic=yahoo.com@groups.io mailto:very_fuzzy_logic=yahoo.com@groups.io > wrote:


It's the 'sweep logic' IC that controls A, B sweep, trigger and hold off. They turn up quite regularly on eBay, typically $20 or so plus postage to Europe. They are used in several of the 7000 timebases, eg 7B50A, 7B80, 7B85 and others, so you might be lucky and find a scrap timebase plugin but even scrap units seem to fetch quite high prices.

Regards,

Roger



Re: Tektronix Neon Light replacement parts?

 

A 575, 576, or 577 curve tracer is ideal for doing this. Be sure to use a 100K or equivalent load resistor so the bulb doesn't draw so much current it will burn up.

Dennis Tillman W7PF

-----Original Message-----
From: Chuck Harris
Sent: Wednesday, January 23, 2019 7:08 PM
Subject: Re: [TekScopes] Tektronix Neon Light replacement parts?

I shouldn't think it would be all that difficult to test the strike voltage
in various ambient lighting conditions, both with and without the blue led...

-Chuck Harris

Harvey White wrote:
On Thu, 24 Jan 2019 01:09:54 +0000 (UTC), you wrote:

What about plain NE-2's and 1 or more blue led's shining on it?
Not sure what this would do for accuracy of strike voltage. Ought to
lower it, though. No idea if it would stay constant, either.

(have a power strip with the usual flickering neons, UV light or blue
light and they go on....)

Harvey

Leon Robinson K5JLR

On Wednesday, January 23, 2019, 6:30:01 PM CST, Dan Cordova via
Groups.Io <danny_cordov=yahoo.com@groups.io> wrote:

Hi David,
Thank you for your prompt reply!
I found the lamps on the schematic and ordered some.
Once these are installed, the curve tracer should be back in working
order. I found three paper caps that were bad and replaced them.
Speaking of radiation- I have a EG&G KN-2 tube that has Ni-63. It is a
radioactive isotope of nickel, half life of 101 years, emits beta particles
(when functioning). It was used for triggering a laser.
I'm retired from Sandia National Laboratories after 30+ years, don't glow
at night, and haven't suffered any ill effects (yet) from soldering with
Sn/Pb solder.
Thanks again for the info.
Dan
On Wednesday, January 23, 2019, 4:06:54 PM PST, David Holland
<david.w.holland@gmail.com> wrote:

They appear to be NE-23's.... Eg: NE2's + Radioactive gas (that's no
longer radioactive by now) :-)

I'd probably just go with bog standard A1A's, as I don't believe
they're particularly critical (though I did not look).

https://www.mouser.com/ProductDetail/VCC/A1A?qs=sGAEpiMZZMsEIsGLxVc9k
JiHZr4x%252btYO

But if you want a little more radiation in your life, and be more
correct I gather they're called 5AB's now.

https://www.mouser.com/ProductDetail/VCC/5AB-BT?qs=oFdBtU78F3wIszsEPQ
JjcA%3D%3D

(No, I don't think there's any radiation danger, though I don't
recommend huffing a 5AB... :-P )

David

On Wed, Jan 23, 2019 at 4:08 PM Dan Cordova via Groups.Io
<danny_cordov=yahoo.com@groups.io> wrote:

Hello- while replacing bad capacitors on my Tektronix 575 Curve Tracer, I
literally touched a couple of the neon lights and broke the leads.

Is there a replacement part the group can recommend?

The neon lights are useful to show at a glance that the circuit has
power, but can the lights be replaced with a wire, or would I need to put a
resistor in place?

TIA
Dan


--
Dennis Tillman W7PF
TekScopes Moderator


Tek 1750 Waveform/Vector Scope Parts

mural
 

I have a Tek 1750 Waveform/Vectorscope that was damaged in shipping and I am looking for a replacement Control Panel. The line select shaft encoder was pushed in and it has damaged the panel facia and the PC board. It is an easily removable module and it would be excellent if we can find a replacement. Any ideas would be appreciated.


Re: Tektronix Neon Light replacement parts?

Chuck Harris <cfharris@...>
 

I shouldn't think it would be all that difficult
to test the strike voltage in various ambient lighting
conditions, both with and without the blue led...

-Chuck Harris

Harvey White wrote:

On Thu, 24 Jan 2019 01:09:54 +0000 (UTC), you wrote:

What about plain NE-2's and 1 or more blue led's shining on it?
Not sure what this would do for accuracy of strike voltage. Ought to
lower it, though. No idea if it would stay constant, either.

(have a power strip with the usual flickering neons, UV light or blue
light and they go on....)

Harvey



Leon Robinson K5JLR

Political Correctness is a Political Disease.
Politicians and Diapers should be changed
often and for the same reasons.

On Wednesday, January 23, 2019, 6:30:01 PM CST, Dan Cordova via Groups.Io <danny_cordov=yahoo.com@groups.io> wrote:

Hi David,
Thank you for your prompt reply!
I found the lamps on the schematic and ordered some.
Once these are installed, the curve tracer should be back in working order. I found three paper caps that were bad and replaced them.
Speaking of radiation- I have a EG&G KN-2 tube that has Ni-63. It is a radioactive isotope of nickel, half life of 101 years, emits beta particles (when functioning). It was used for triggering a laser.
I'm retired from Sandia National Laboratories after 30+ years, don't glow at night, and haven't suffered any ill effects (yet) from soldering with Sn/Pb solder.
Thanks again for the info.
Dan




On Wednesday, January 23, 2019, 4:06:54 PM PST, David Holland <david.w.holland@gmail.com> wrote:

They appear to be NE-23's.... Eg: NE2's + Radioactive gas (that's no
longer radioactive by now) :-)

I'd probably just go with bog standard A1A's, as I don't believe
they're particularly critical (though I did not look).

https://www.mouser.com/ProductDetail/VCC/A1A?qs=sGAEpiMZZMsEIsGLxVc9kJiHZr4x%252btYO

But if you want a little more radiation in your life, and be more
correct I gather they're called 5AB's now.

https://www.mouser.com/ProductDetail/VCC/5AB-BT?qs=oFdBtU78F3wIszsEPQJjcA%3D%3D

(No, I don't think there's any radiation danger, though I don't
recommend huffing a 5AB... :-P )

David

On Wed, Jan 23, 2019 at 4:08 PM Dan Cordova via Groups.Io
<danny_cordov=yahoo.com@groups.io> wrote:

Hello- while replacing bad capacitors on my Tektronix 575 Curve Tracer, I literally touched a couple of the neon lights and broke the leads.

Is there a replacement part the group can recommend?

The neon lights are useful to show at a glance that the circuit has power, but can the lights be replaced with a wire, or would I need to put a resistor in place?

TIA
Dan












Re: Tektronix Neon Light replacement parts?

Harvey White
 

On Thu, 24 Jan 2019 01:09:54 +0000 (UTC), you wrote:

What about plain NE-2's and 1 or more blue led's shining on it?
Not sure what this would do for accuracy of strike voltage. Ought to
lower it, though. No idea if it would stay constant, either.

(have a power strip with the usual flickering neons, UV light or blue
light and they go on....)

Harvey



Leon Robinson    K5JLR

Political Correctness is a Political Disease.
Politicians and Diapers should be changed
often and for the same reasons.

On Wednesday, January 23, 2019, 6:30:01 PM CST, Dan Cordova via Groups.Io <danny_cordov=yahoo.com@groups.io> wrote:

Hi David,
Thank you for your prompt reply!
I found the lamps on the schematic and ordered some. 
Once these are installed, the curve tracer should be back in working order. I found three paper caps that were bad and replaced them. 
Speaking of radiation- I have a EG&G KN-2 tube that has Ni-63. It is a radioactive isotope of nickel, half life of  101 years, emits beta particles (when functioning). It was used for triggering a laser.
I'm retired from Sandia National Laboratories after 30+ years, don't glow at night, and haven't suffered any ill effects (yet) from soldering with Sn/Pb solder.
Thanks again for the info.
Dan




    On Wednesday, January 23, 2019, 4:06:54 PM PST, David Holland <david.w.holland@gmail.com> wrote:

They appear to be NE-23's....  Eg: NE2's + Radioactive gas (that's no
longer radioactive by now) :-)

I'd probably just go with bog standard A1A's, as I don't believe
they're particularly critical (though I did not look).

https://www.mouser.com/ProductDetail/VCC/A1A?qs=sGAEpiMZZMsEIsGLxVc9kJiHZr4x%252btYO

But if you want a little more radiation in your life, and be more
correct I gather they're called 5AB's now.

https://www.mouser.com/ProductDetail/VCC/5AB-BT?qs=oFdBtU78F3wIszsEPQJjcA%3D%3D

(No, I don't think there's any radiation danger, though I don't
recommend huffing a 5AB... :-P  )

David

On Wed, Jan 23, 2019 at 4:08 PM Dan Cordova via Groups.Io
<danny_cordov=yahoo.com@groups.io> wrote:

Hello- while replacing bad capacitors on my Tektronix 575 Curve Tracer, I literally touched a couple of the neon lights and broke the leads.

Is there a replacement part the group can recommend?

The neon lights are useful to show at a glance that the circuit has power, but can the lights be replaced with a wire, or would I need to put a resistor in place?

TIA
Dan









SG 504 leveling head

 

Hi all...I am coming to the end of my stock in quality SG 504 leveling hads...so if u need please get soon.
https://www.ebay.com/itm/Tektronix-SG504-Improved-Calibrated-Leveling-Head/132801983494?hash=item1eeb9d7406:g:lz0AAOSwq19XCJQt:rk:1:pf:0


Re: Tektronix Neon Light replacement parts?

Leon Robinson
 

What about plain NE-2's and 1 or more blue led's shining on it?

Leon Robinson    K5JLR

Political Correctness is a Political Disease.
Politicians and Diapers should be changed
often and for the same reasons.

On Wednesday, January 23, 2019, 6:30:01 PM CST, Dan Cordova via Groups.Io <danny_cordov=yahoo.com@groups.io> wrote:

Hi David,
Thank you for your prompt reply!
I found the lamps on the schematic and ordered some. 
Once these are installed, the curve tracer should be back in working order. I found three paper caps that were bad and replaced them. 
Speaking of radiation- I have a EG&G KN-2 tube that has Ni-63. It is a radioactive isotope of nickel, half life of  101 years, emits beta particles (when functioning). It was used for triggering a laser.
I'm retired from Sandia National Laboratories after 30+ years, don't glow at night, and haven't suffered any ill effects (yet) from soldering with Sn/Pb solder.
Thanks again for the info.
Dan




    On Wednesday, January 23, 2019, 4:06:54 PM PST, David Holland <david.w.holland@gmail.com> wrote:

They appear to be NE-23's....  Eg: NE2's + Radioactive gas (that's no
longer radioactive by now) :-)

I'd probably just go with bog standard A1A's, as I don't believe
they're particularly critical (though I did not look).

https://www.mouser.com/ProductDetail/VCC/A1A?qs=sGAEpiMZZMsEIsGLxVc9kJiHZr4x%252btYO

But if you want a little more radiation in your life, and be more
correct I gather they're called 5AB's now.

https://www.mouser.com/ProductDetail/VCC/5AB-BT?qs=oFdBtU78F3wIszsEPQJjcA%3D%3D

(No, I don't think there's any radiation danger, though I don't
recommend huffing a 5AB... :-P  )

David

On Wed, Jan 23, 2019 at 4:08 PM Dan Cordova via Groups.Io
<danny_cordov=yahoo.com@groups.io> wrote:

Hello- while replacing bad capacitors on my Tektronix 575 Curve Tracer, I literally touched a couple of the neon lights and broke the leads.

Is there a replacement part the group can recommend?

The neon lights are useful to show at a glance that the circuit has power, but can the lights be replaced with a wire, or would I need to put a resistor in place?

TIA
Dan



Re: Tektronix Neon Light replacement parts?

Dan Cordova <danny_cordov@...>
 

Hi David,
Thank you for your prompt reply!
I found the lamps on the schematic and ordered some. 
Once these are installed, the curve tracer should be back in working order. I found three paper caps that were bad and replaced them. 
Speaking of radiation- I have a EG&G KN-2 tube that has Ni-63. It is a radioactive isotope of nickel, half life of  101 years, emits beta particles (when functioning). It was used for triggering a laser.
I'm retired from Sandia National Laboratories after 30+ years, don't glow at night, and haven't suffered any ill effects (yet) from soldering with Sn/Pb solder.
Thanks again for the info.
Dan

On Wednesday, January 23, 2019, 4:06:54 PM PST, David Holland <david.w.holland@gmail.com> wrote:

They appear to be NE-23's....  Eg: NE2's + Radioactive gas (that's no
longer radioactive by now) :-)

I'd probably just go with bog standard A1A's, as I don't believe
they're particularly critical (though I did not look).

https://www.mouser.com/ProductDetail/VCC/A1A?qs=sGAEpiMZZMsEIsGLxVc9kJiHZr4x%252btYO

But if you want a little more radiation in your life, and be more
correct I gather they're called 5AB's now.

https://www.mouser.com/ProductDetail/VCC/5AB-BT?qs=oFdBtU78F3wIszsEPQJjcA%3D%3D

(No, I don't think there's any radiation danger, though I don't
recommend huffing a 5AB... :-P  )

David

On Wed, Jan 23, 2019 at 4:08 PM Dan Cordova via Groups.Io
<danny_cordov=yahoo.com@groups.io> wrote:

Hello- while replacing bad capacitors on my Tektronix 575 Curve Tracer, I literally touched a couple of the neon lights and broke the leads.

Is there a replacement part the group can recommend?

The neon lights are useful to show at a glance that the circuit has power, but can the lights be replaced with a wire, or would I need to put a resistor in place?

TIA
Dan



Re: Tektronix Neon Light replacement parts?

David Holland
 

They appear to be NE-23's.... Eg: NE2's + Radioactive gas (that's no
longer radioactive by now) :-)

I'd probably just go with bog standard A1A's, as I don't believe
they're particularly critical (though I did not look).

https://www.mouser.com/ProductDetail/VCC/A1A?qs=sGAEpiMZZMsEIsGLxVc9kJiHZr4x%252btYO

But if you want a little more radiation in your life, and be more
correct I gather they're called 5AB's now.

https://www.mouser.com/ProductDetail/VCC/5AB-BT?qs=oFdBtU78F3wIszsEPQJjcA%3D%3D

(No, I don't think there's any radiation danger, though I don't
recommend huffing a 5AB... :-P )

David

On Wed, Jan 23, 2019 at 4:08 PM Dan Cordova via Groups.Io
<danny_cordov=yahoo.com@groups.io> wrote:

Hello- while replacing bad capacitors on my Tektronix 575 Curve Tracer, I literally touched a couple of the neon lights and broke the leads.

Is there a replacement part the group can recommend?

The neon lights are useful to show at a glance that the circuit has power, but can the lights be replaced with a wire, or would I need to put a resistor in place?

TIA
Dan



Re: Tektronix Neon Light replacement parts?

Jim Ford
 

Dan,
IIRC, Mouser had neon bulbs, but Digi-Key did not.   Bought some a few years back to protect a low-noise amp.  Good luck!
Jim Ford 


Sent from my Verizon, Samsung Galaxy smartphone

-------- Original message --------From: "Dan Cordova via Groups.Io" <danny_cordov=yahoo.com@groups.io> Date: 1/23/19 1:08 PM (GMT-08:00) To: TekScopes@groups.io Subject: [TekScopes] Tektronix Neon Light replacement parts?
Hello- while replacing bad capacitors on my Tektronix 575 Curve Tracer, I literally touched a couple of the neon lights and broke the leads.

Is there a replacement part the group can recommend?

The neon lights are useful to show at a glance that the circuit has power, but can the lights be replaced with a wire, or would I need to put a resistor in place?

TIA
Dan


Re: Tektronix Neon Light replacement parts?

Harvey White
 

On Wed, 23 Jan 2019 13:08:48 -0800, you wrote:

Hello- while replacing bad capacitors on my Tektronix 575 Curve Tracer, I literally touched a couple of the neon lights and broke the leads.

Is there a replacement part the group can recommend?
Offhand, I'd look for the replacement part and go that way.


The neon lights are useful to show at a glance that the circuit has power, but can the lights be replaced with a wire, or would I need to put a resistor in place?
Actually, I've seen them used in two ways, one to limit voltage, the
other to limit voltage in unusual circumstances. The difference is if
the light is supposed to be on normally, or fire (and limit voltage)
if there's an overvoltage circumstance. Such a thing can happen
during warmup or shutdown.

Harvey



TIA
Dan



Re: 465 No Go, part two

Harvey White
 

On Wed, 23 Jan 2019 12:11:02 -0800, you wrote:

My power supplies are all now right on. -8 is now working after replacing the Bridge Rectifier .
I now have a fuzzie beam from top to bottom of the screen , that sweeps left to right. I can control the rate of speed it travels I can stop the beam and then move it left to right with the positionng knob.
When I push the beam finder I get a Football shape dot that is about a half inch tall and about a quarter inch wide, it is very sharp and bright. It does not change shape when I turn the volts/ Div knob . Sometimes when I turn Scope off and then on again I get a Football shape dot in the other direction , what ever direction it is right down the center line
I can control the brightness of the sweep but not the focus .
My brain is tired, please help think
Since Focus does not work, that's a problem. If the spot is football
shaped, then astigmatism is not adjusted properly (or doesn't work).

One common way of adjusting astigmatism is to defocus the spot, then
adjust it for the best round shape you can.

Once you focus the spot, reduce the intensity, and adjust the image
for best focus, alternating that with the astigmatism control.

There's a focus voltage, and divider. With a high voltage probe (if
you need it), measure the focus voltage, and check that it does
change, and covers the range of the "average" focus voltage for that
CRT.

If not, then check the supply voltage to the focus control. If that's
ok, then check the resistors from that point, through the control, and
to ground. All those readings should be consistent.

Harvey


Thank you
Dave
PS I still do not have an Oscoloscope to check my Oscoloscope.


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