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

From: David Garrido

To: TekScopes@...

Sent: Monday, October 08, 2012 5:34 PM

Subject: [TekScopes] 2465B - A5 board - U2420 Testing

?

Ok Folks,

In the photos section i put a few pics of my 2465B - A5 board - U2420 Testing. ?

?

Could you guys take a look at my readings and help me understand what I have going on here?

The voltages in green are Voltage Drop across a resistor or if they are next to a U2420 Pin then they are the actual voltage at the pin. ?If they are in red they are the voltages at that end of each respective resistor.

I have the pic of the KNOWN GOOD 2445B scope A5 board for comparison as well as the A5 Board Layout. ?I have verified the -1.25 reference and it is rock solid. ?I have verified that all resistors are reading the correct value especially after the replacement of the electrolytics and renewal of the reference ladder.

Am I dealing with a bad op amp or two inside U2420? ?What say you?

Cheers

?

On 10/08/2012 02:08 PM, Gala Dragos wrote:

?

Oh yeah, last batch of those were "found" after I asked nicely the guy at Vernonia.

There are equivalents, in plastic through.

These are?scarce?because they have been used in so many?devices, Tek465, Tek475, I think that even Tek485, and a whole bunch of other tek modules.

How about the 465M?
If so, I may be able to help.

From: James R. Bartlett
To: TekScopes@...
Sent: Monday, October 8, 2012 5:12 PM
Subject: Re: [TekScopes] 465 Pot

?

Thanks Tom,

It is a 10k pot with a switch at the rear.

Seems to be a scarce item, No luck so far.

But I live in hope. Must be some out there somewhere.

The part number is 311-1192-00.

Thanks again

Jim

On 8 October 2012 15:04, Tom Jobe <tomjobe@...> wrote:

?

I?think I was looking for that same pot a year or two ago?(if it had 10k in both halves) and none were to be found at Veronia Northern or elsewhere.

An eBay seller had something close enough, but I forget the exact details.

tom jobe...

?

?

?

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

From: James R. Bartlett

To: TekScopes@...

Sent: Monday, October 08, 2012 6:24 AM

Subject: Re: [TekScopes] 465 Pot

?

Thanks Gala
Forgot the part number , it is 311-1192-00.

Will try that place.

Many thanks

Regads

Jim

?

?

?

?

?

On 8 October 2012 13:59, Gala Dragos <gala_dragos@...> wrote:

?

Check here??. You need the part number, through.

No affiliation... bla bla bla...

From: James R. Bartlett <james.r.bart@...>
To: Tekscopes@...
Sent: Monday, October 8, 2012 3:50 PM
Subject: [TekScopes] 465 Pot

?

Hi

I have a Tek 465 unfortunately the? Level/Slope? pot/switch is not working.

Is there by any chace a parts unit out there?

I will take two if available..

Many thanks

regards

Jim

Ei2BB

I'm not current on the regulations, but I recall some items being flagged "non-export" or similarly restricted, and requirements for documentation of any future resale. They wanted a Tek specan back from me, but it too had been parted out... I just don't want to deal with them anymore.

-Dave

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

*From: *"Gala Dragos" <gala_dragos@...>
*To: *TekScopes@...
*Sent: *Monday, October 8, 2012 6:00:18 AM
*Subject: *Re: [TekScopes] Gov't Auction - Tek 'scopes

Available for non american ?

--------------------------------------------------------------------------------
*From:* "d.seiter@..." <d.seiter@...>
*To:* TekScopes@...
*Sent:* Monday, October 8, 2012 7:24 AM
*Subject:* Re: [TekScopes] Gov't Auction - Tek 'scopes

One should be warned about government auctions- if, down the road, someone decides that the items should not have been sold for whatever reason, they will come asking for you to return them. Many stories have been told here in the past. I dodged the bullet, and will no longer buy from any of these auctions regardless of how good the deals are.

-Dave

--------------------------------------------------------------------------------
*From: *"druid_noibn" <druid_noibn@...>
*To: *TekScopes@...
*Sent: *Sunday, October 7, 2012 7:48:25 AM
*Subject: *[TekScopes] Gov't Auction - Tek 'scopes

Hi All,

I just got this notification of gov't auction - migt be of interests to some folks here. Go on-line (gsaauctions)and look at picture(s) and any details offered (very few details).

Kind rgards,
DBN

Message 2
From: GSA Auctions <gsaauctions@... <mailto:gsaauctions%40service.govdelivery.com>>
Date: 10/06/2012
Subject: GSA Auctions Electrical and Electronic Equipment Update
You are subscribed to Electrical and Electronic Equipment for GSA Auctions. This information has recently been updated, and is now available.

OSCILLOSCOPE
10/05/2012 10:46 PM EDT

CURRENT BID: $5 STATE: ID NO. OF BIDDERS: 0 CLOSE TIME: 10-12-2012 08:46 PM CT.
OSCILLOSCOPE, MFG TEKTRONIX, MDL USM425MOD, APPROX YR 1989, 1 EA. REPAIRS MAY BE NEEDED.***APPT REQUIRED FOR INSPECTION AND/OR REMOVAL*** (6905E7-2109-6001)*** 6905E721096001

OSCILLOSCOPE
10/05/2012 10:36 PM EDT

CURRENT BID: $15 STATE: ID NO. OF BIDDERS: 0 CLOSE TIME: 10-12-2012 08:36 PM CT.
OSCILLOSCOPE, MFG TEKTRONIX, APPROX. YR 2003, MDL 465M, 1 EA. REPAIRS MAY BE NEEDED.***APPT REQUIRED FOR INSPECTION AND/OR REMOVAL*** (6905E7-2109-5001)*** 6905E721095001

OSCILLOSCOPE
10/05/2012 10:26 PM EDT

CURRENT BID: $15 STATE: ID NO. OF BIDDERS: 0 CLOSE TIME: 10-12-2012 08:26 PM CT.
OSCILLOSCOPE, MFG TEKTRONIX, APPROX. YR 1992, JOINT ELECTRONICS TY AN/USM-425(V)1, 1 EA. REPAIRS MAY BE NEEDED.***APPT REQUIRED FOR INSPECTION AND/OR REMOVAL***(6905E7-2109-4001)*** 6905E721094001

OSCILLOSCOPE
10/05/2012 10:16 PM EDT

CURRENT BID: $15 STATE: ID NO. OF BIDDERS: 0 CLOSE TIME: 10-12-2012 08:16 PM CT.
OSCILLOSCOPE, MFG TEKTRONIX, APPROX. YR 1986, JOINT ELECTRONICS TY ANUSM425V1, 1 EA. REPAIRS MAY BE NEEDED. ****APPT REQUIRED FOR INSPECTION AND/OR REMOVAL****(6905E7-2109-3001)*** 6905E721093001



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

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

From: Mike

To: TekScopes@...

Sent: Monday, October 08, 2012 4:47 PM

Subject: [TekScopes] Re: Tek Probes

?

Sorry for the spelling error and thanks for the correction.

Thanks to all for answers to my question about probes.
I obviously have much to learn about this scope and I am searching for a manual or other info.
I received no documentation with the scope purchase.

Mike

--- In TekScopes@..., "Alex" wrote:
>
> It's "Tektronix", BTW.
>
> --- In TekScopes@..., "Mike" wrote:
> >
> > Hello,
> > I am new to the group and to Tektronics scopes. I have however used other scopes such as B&K and my personally built Heathkit.
> > I recently purchased a model 465M scope with an assortment of leads at a local yard sale.
> > So far the scope seems to be working fine but I noticed that one of the probes (the only Tektronics labeled one) has a spring loaded pin on the ring of the BNC connector and that leads to my question.
> > What is the purpose of that pin?
> > I am assuming that it is to insure a good ground reference connection but wonder if it has other functions.
> >
> > Thanks for help,
> >
> > Mike
> >
>

It's "Tektronix", BTW.

--- In TekScopes@..., "Mike" <n3xpd@> wrote:

Hello,
I am new to the group and to Tektronics scopes. I have however used other scopes such as B&K and my personally built Heathkit.
I recently purchased a model 465M scope with an assortment of leads at a local yard sale.
So far the scope seems to be working fine but I noticed that one of the probes (the only Tektronics labeled one) has a spring loaded pin on the ring of the BNC connector and that leads to my question.
What is the purpose of that pin?
I am assuming that it is to insure a good ground reference connection but wonder if it has other functions.

Thanks for help,

Mike

Hello,
I am new to the group and to Tektronics scopes. I have however used other scopes such as B&K and my personally built Heathkit.
I recently purchased a model 465M scope with an assortment of leads at a local yard sale.
So far the scope seems to be working fine but I noticed that one of the probes (the only Tektronics labeled one) has a spring loaded pin on the ring of the BNC connector and that leads to my question.
What is the purpose of that pin?
I am assuming that it is to insure a good ground reference connection but wonder if it has other functions.

Thanks for help,

Mike

From: d.seiter@...
Subject: Re: [TekScopes] Gov't Auction - Tek 'scopes
To: TekScopes@...
Date: Monday, October 8, 2012, 12:24 AM

?

One should be warned about government auctions- if, down the road, someone decides that the items should not have been sold for whatever reason, they will come asking for you to return them. ?Many stories have been told here in the past. I dodged the bullet, and will no longer buy from any of these auctions regardless of how good the deals are.

-Dave

---

From: "druid_noibn"
To: TekScopes@...
Sent: Sunday, October 7, 2012 7:48:25 AM
Subject: [TekScopes] Gov't Auction - Tek 'scopes

?

Hi All,

I just got this notification of gov't auction - migt be of interests to some folks here. Go on-line (gsaauctions)and look at picture(s) and any details offered (very few details).

Kind rgards,
DBN

Message 2
From: GSA Auctions <>
Date: 10/06/2012
Subject: GSA Auctions Electrical and Electronic Equipment Update
You are subscribed to Electrical and Electronic Equipment for GSA Auctions. This information has recently been updated, and is now available.

OSCILLOSCOPE
10/05/2012 10:46 PM EDT

CURRENT BID: $5 STATE: ID NO. OF BIDDERS: 0 CLOSE TIME: 10-12-2012 08:46 PM CT.
OSCILLOSCOPE, MFG TEKTRONIX, MDL USM425MOD, APPROX YR 1989, 1 EA. REPAIRS MAY BE NEEDED.***APPT REQUIRED FOR INSPECTION AND/OR REMOVAL*** (6905E7-2109-6001)*** 6905E721096001

OSCILLOSCOPE
10/05/2012 10:36 PM EDT

CURRENT BID: $15 STATE: ID NO. OF BIDDERS: 0 CLOSE TIME: 10-12-2012 08:36 PM CT.
OSCILLOSCOPE, MFG TEKTRONIX, APPROX. YR 2003, MDL 465M, 1 EA. REPAIRS MAY BE NEEDED.***APPT REQUIRED FOR INSPECTION AND/OR REMOVAL*** (6905E7-2109-5001)*** 6905E721095001

OSCILLOSCOPE
10/05/2012 10:26 PM EDT

CURRENT BID: $15 STATE: ID NO. OF BIDDERS: 0 CLOSE TIME: 10-12-2012 08:26 PM CT.
OSCILLOSCOPE, MFG TEKTRONIX, APPROX. YR 1992, JOINT ELECTRONICS TY AN/USM-425(V)1, 1 EA. REPAIRS MAY BE NEEDED.***APPT REQUIRED FOR INSPECTION AND/OR REMOVAL***(6905E7-2109-4001)*** 6905E721094001

OSCILLOSCOPE
10/05/2012 10:16 PM EDT

CURRENT BID: $15 STATE: ID NO. OF BIDDERS: 0 CLOSE TIME: 10-12-2012 08:16 PM CT.
OSCILLOSCOPE, MFG TEKTRONIX, APPROX. YR 1986, JOINT ELECTRONICS TY ANUSM425V1, 1 EA. REPAIRS MAY BE NEEDED. ****APPT REQUIRED FOR INSPECTION AND/OR REMOVAL****(6905E7-2109-3001)*** 6905E721093001

-----Original Message-----
From: TekScopes@... [mailto:TekScopes@...]
On Behalf Of Brad Thompson
Sent: 08 October 2012 15:13
To: TekScopes@...
Subject: Re: [TekScopes] Tek Probes

On 10/8/2012 10:03 AM, Mike wrote:

Hello,
I am new to the group and to Tektronics scopes. I have however used
other scopes such as B&K and my personally built Heathkit.
I recently purchased a model 465M scope with an assortment of leads at
a local yard sale.
So far the scope seems to be working fine but I noticed that one of
the probes (the only Tektronics labeled one) has a spring loaded pin
on the ring of the BNC connector and that leads to my question.
What is the purpose of that pin?
I am assuming that it is to insure a good ground reference connection
but wonder if it has other functions.

Hello, Mike--

That's indeed its purpose. IIRC, a length of wire presents approximately

nanohenries per inch of length. Introducing extra inductance between the
probe and the circuit under test can seriously distort waveshapes. Also,

loop formed by the probe ground wire can pick up extraneous noise radiated
by nearby circuits.

73--

Brad AA1IP



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

Yahoo! Groups Links

Not sure , but isn't that to communicate to the scope when the x1 or x10
switch in the probe is active?
Pat - W9ZO
==================================================================================
Mike wrote the following on 10/8/2012 9:03 AM:

Hello,
I am new to the group and to Tektronics scopes. I have however used
other scopes such as B&K and my personally built Heathkit.
I recently purchased a model 465M scope with an assortment of leads at
a local yard sale.
So far the scope seems to be working fine but I noticed that one of
the probes (the only Tektronics labeled one) has a spring loaded pin
on the ring of the BNC connector and that leads to my question.
What is the purpose of that pin?
I am assuming that it is to insure a good ground reference connection
but wonder if it has other functions.

Thanks for help,

Mike

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<div class="moz-cite-prefix">Not sure , but isn't that to
communicate to the scope when the x1 or x10 switch in the probe is
active?<br>
Pat - W9ZO<br>
==================================================================================<br>
Mike wrote the following on 10/8/2012 9:03 AM:<br>
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<p>Hello,<br>
I am new to the group and to Tektronics scopes. I have
however used other scopes such as B&amp;K and my
personally built Heathkit.<br>
I recently purchased a model 465M scope with an assortment
of leads at a local yard sale.<br>
So far the scope seems to be working fine but I noticed
that one of the probes (the only Tektronics labeled one)
has a spring loaded pin on the ring of the BNC connector
and that leads to my question.<br>
What is the purpose of that pin?<br>
I am assuming that it is to insure a good ground reference
connection but wonder if it has other functions.<br>
<br>
Thanks for help,<br>
<br>
Mike<br>
<br>
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