Date   

Re: Probes for 2445A

Malcolm Hunter
 

On 16 February 2016 at 20:12, John Clark johnclark05@...
[TekScopes] <TekScopes@...> wrote:

I found the old Tek catalogs very helpful for this. The latest catalog
available on the TekWiki site is from 2000 but on page 500 it lists the
suggested replacement probes for the discontinued instruments, including
the 2445A.

<http://w140.com/tekwiki/wiki/Tek_Catalogs>
​Thanks. These seem to be quite specific and don't mention that you can use
a P6131 on a 2445A (for example).

Malcolm​


Re: Probes for 2445A

 

Malcolm,
I confirmed to the seller that I would like to buy them if they are good (cable etc.)
The seller is on this Marktplaats for 6.5 years, which usually means that they are ok. He's got some other "serious/professional" stuff for sale ATM as well.
I'll let you know as soon as I get a response.

You know there are several versions of these probes? Firstly, there are different cable lengths: These are all "nice and short" 1.3m length, i.e. highest BW. Also, there's an Option 25 (I think), which has the larger, more traditional (6 mm) tip. AFAI could see, these are not Option 25.

Should you want to (start with) a spare cable: There's one for sale "brand new" from Israel on Ebay # 231844909513.

Raymond


Re: Probes for 2445A

John Clark
 

Malcom,
I found the old Tek catalogs very helpful for this. The latest catalog available on the TekWiki site is from 2000 but on page 500 it lists the suggested replacement probes for the discontinued instruments, including the 2445A.

<http://w140.com/tekwiki/wiki/Tek_Catalogs>

John

To: TekScopes@...
From: TekScopes@...
Date: Tue, 16 Feb 2016 18:56:17 +0000
Subject: [TekScopes] Probes for 2445A


























Hi,



Before I spend $200 on 4 P6133 probes (ebay #351442258034) shipped to the

UK, am I getting the correct ones for my Tek 2445A? Is that a good price?



Thanks,

Malcolm



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


Re: Probes for 2445A

Malcolm Hunter
 

On 16 February 2016 at 19:16, 'Colin Herbert' colingherbert@...
[TekScopes] <TekScopes@...> wrote:

Yes, I think so. In future, you could always take a peek here:

http://www.barrytech.com/tektronix/probes/tekprobes.html

You'll find a wealth of info on Tek probes, including compatibility,
original prices, eBay prices, etc..
​Thanks Colin. Yes, I knew about that list but​ didn't want to risk $200 on
my interpretation.

Malcolm


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


Re: Probes for 2445A

 

Made a mistake in my recent msg.Here is a link (in Dutch . Please Yahoo, don't let me down on this:

<http://www.marktplaats.nl/a/doe-het-zelf-en-verbouw/meetapparatuur/m1020754709-tektronix-p6131-probes.html?c=8c285449651fa109c354bbabe740c1b&previousPage=lr>

Raymond


Re: Probes for 2445A

 

Hi Malcolm,
I don't think that's a very good price at all.
P6133's are regularly available in (continental) Europe at lower prices. The other day, four P6131's (300 MHz, well suited for anything from 2445(X) to 2465/67(X)) € 25 each, which is typical. Two are left at the moment.
P6138/39's etc. are more expensive - and not as easily adapted to a 24XX.
Like the probes in your link, the low-inductance accessory "pins" don't seem to be part of the deal though.
I'll buy them for you if you want. I would try and get confirmation that cables are in perfect condition.
P6106(A)'s (as an example) are well suited for your 2445(X) as well and not expensive.

Raymond


Re: Probes for 2445A

Colin Herbert
 

Yes, I think so. In future, you could always take a peek here:



http://www.barrytech.com/tektronix/probes/tekprobes.html



You'll find a wealth of info on Tek probes, including compatibility,
original prices, eBay prices, etc..



Colin



From: TekScopes@... [mailto:TekScopes@...]
Sent: 16 February 2016 18:56
To: TekScopes@...
Subject: [TekScopes] Probes for 2445A





Hi,

Before I spend $200 on 4 P6133 probes (ebay #351442258034) shipped to the
UK, am I getting the correct ones for my Tek 2445A? Is that a good price?

Thanks,
Malcolm


Re: Ebay Rip-off ? - "Global Shipping Program"

tek_547
 

Also a bit late Dennis but good to know, thanx!
René


Probes for 2445A

Malcolm Hunter
 

Hi,

Before I spend $200 on 4 P6133 probes (ebay #351442258034) shipped to the
UK, am I getting the correct ones for my Tek 2445A? Is that a good price?

Thanks,
Malcolm


Re: Tek 465 intensity problem

Tom Gardner
 

On 16/02/16 00:15, fqo63ta@... [TekScopes] wrote:

The 0777 CRT will run just fine in a 465...I've done it many times.
This raises the question of how to determine which tubes can work in which scopes, especially tubes (such at the 0777) that weren't originally used in the (465) scope. My only sources are:
http://www.reprise.com/host/tektronix/reference/crt.asp
and
http://www.sphere.bc.ca/test/tek-crts.html

Are there any others?


Re: CRT article

EB4APL
 

Neutral gray filters are the most basic, the principle of operation is
that the light from the phosphor crosses the filter one time but the
ambient light does twice, one time to the screen and other when
reflected back so it is attenuated twice that the light from the trace.
Colored filters usually are made in a color that matches the emission
spectra of the phosphor so the trace light is attenuated much less than
the ambient light.
The metallic mesh filters also serve another purpose, they shield the
EMI leaking from the screen aperture.
There are more sophisticated filters like the polarized ones that are
based in that the reflected light is polarized in reverse so it is
attenuated very much. They work like Polaroid sunglasses.

Regards,
Ignacio

El 16/02/2016 a las 16:56, 'Dale H. Cook'
bridgewaterma@... [TekScopes] escribi:

At 10:12 AM 2/16/2016, Dwayne Verhey wrote:

I was also intrigued by the notation that most scopes came with a
grey filter. In my very limited experience, I have not seen one remain
with the scope over the years, or tried one. How effective are they?

They can be very effective when there is a lot of ambient light that
would otherwise reflect off of the face of the CRT or affect the
phosphor. Gray filters made of a fine mesh have also been used for
that purpose, as on my 453:

http://plymouthcolony.net/starcity/radios/images/tek453_a.jpg

Dale H. Cook, GR / HP Collector, Roanoke/Lynchburg, VA
http://plymouthcolony.net/starcity/radios/index.html


------------------------------------------------------------------------
Posted by: "Dale H. Cook" <bridgewaterma@...>
------------------------------------------------------------------------


---
El software de antivirus Avast ha analizado este correo electrnico en busca de virus.
https://www.avast.com/antivirus


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


Re: CRT article

Dale H. Cook
 

At 10:12 AM 2/16/2016, Dwayne Verhey wrote:

I was also intrigued by the notation that most scopes came with a grey filter. In my very limited experience, I have not seen one remain with the scope over the years, or tried one. How effective are they?
They can be very effective when there is a lot of ambient light that would otherwise reflect off of the face of the CRT or affect the phosphor. Gray filters made of a fine mesh have also been used for that purpose, as on my 453:

http://plymouthcolony.net/starcity/radios/images/tek453_a.jpg

Dale H. Cook, GR / HP Collector, Roanoke/Lynchburg, VA
http://plymouthcolony.net/starcity/radios/index.html


Re: CRT article

Marian B
 

On 16.02.2016 16:12, Dwayne Verhey tekscopes@... [TekScopes] wrote:
On 15/02/2016 4:35 PM, David @DWH [TekScopes] wrote:

http://www.davmar.org/concepts.html
http://www.davmar.org/TE/TekConcepts/062-0852-01_CRTs_Jul69.pdf
That was a great read, and really helped clear up some concepts for me
(eg: what exactly does the astigmatism control adjust?).
Indeed a good read! I feel like I should learn more about electron
optics, can someone recommend a book about them?

Cheers, Marian


CRT article

Torch Fireman
 

On 15/02/2016 4:35 PM, David @DWH [TekScopes] wrote:

http://www.davmar.org/concepts.html
http://www.davmar.org/TE/TekConcepts/062-0852-01_CRTs_Jul69.pdf
That was a great read, and really helped clear up some concepts for me (eg: what exactly does the astigmatism control adjust?).

I was also intrigued by the notation that most scopes came with a grey filter. In my very limited experience, I have not seen one remain with the scope over the years, or tried one. How effective are they? I found some used ones (incorporated into a light hood) for my 475 on eBay.


Re: 7904 - Very Dim Trace

Jim McIntyre
 

Right. So far, I've not torn into the HV sections of the power supply. Replacing/Fixing the Z-axis board is on the path of least resistance...


Re: Bringing up to snuff a Tek 465M

 

You're correct; the 465M has a different case style which cannot be slid off as I described.But, this works great on all the other 4xx series with the aluminum case.
 HankC, Boston WA1HOS

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


OT: groups for Gould and Grass electronics ?

Tim Phillips <tim@...>
 

from Tim P (UK)
sorry for the OT - are there Ya-groups for Gould electronics and Grass physiological instrumentation ?
How could I search the Yahoo group site for keywords like this ?
many thanks
Tim


Re: 2465B / 2467B Calibration

Michael
 

Additional information from the -01 service manual shows that the change
occurred in t he -05 ROM revision for both the 2465B and 2457B. Since the next
ROM version mentioned is the -08 version, perhaps the change was introduced by
the -06 or -07 ROM version. In which case it might be just a ROM related
change with no backing hardware changes at all. Still, it would be nice to
know that for sure.


Mike






I am planning on upgrading the firmware of my 2465B CT (pre B05xxxx serial
number). before it gets calibrated. This is to pick up any software bug fixes
(usually, the main reason for firmware upgrades), possible algorithm
improvements and feature additions or improvements. That leads to two
questions.

First, I have the .bin files for the -10 firmware (160-5370-10 and
160-5371-10). However, I have been unable to find the -11 firmware (which
unlike the other firmware versions actually adds a minor feature or two). Does
anyone here have the -11 firmware .bin files? Or are they in one of the file
upload groups. I can't read the archives or the file uploads. If someone does
have the -11 firmware or it is in the file uploads, I would appreciate if it
would be emailed to me.

Second, in reading the service manual for gotchas related to a firmware
upgrade and calibration, I found that on page 5-16 of the service manual,
for the horizontal timing adjustment in table 5-3 it states

"Steps 32, 33, and 34 are for 2465B instruments with serial numbers B012946
and above, and 2467B instruments with serial numbers B010537 and above."

The Army's calibration procedure has the same constraints.

I went through the service manual with a fine tooth comb and found that
neither B012946 nor B010537 are related to any change or difference whatsoever.
For the 2465B, serial number B012946 is right in the middle of the -04 ROM
range. For the 2467B, serial number B010537 is right in the middle of the -05
ROM range.

That would argue that, at the very least, the -04 ROM contains whatever is
necessary for steps 32, 33 and 34. But it also argues that it is not ROM
related. But, there must be SOME difference, or it would just be an update to
the calibration procedure. It also argues that even if I upgrade the firmware
to -11, those steps still should not be performed. The only thing that I can
think of is a version change in one of the boards common to the 2465B and
2467B that does not affect the parts list and does not involve any other
changes. However, such an update is not documented anywhere in the service
manual.

Does anyone know exactly why those steps shouldn't be performed on earlier
serial numbers (mine, for example, is B010xxx and so precedes B012946)? Would
it actually be harmful to perform them?

Additionally, does anyone know of a reason - other than the need for
recalibration - NOT to upgrade the firmware from -04 to -11? And, if
that would cause a problem, what about to -10 or -7?

Mike





--
Best regards,
2465bct mailto:2465bct@...


Re: Introduction of myself!

 

Were the memory boards changed as part of an upgrade to older models?
I don't know the answer to your question, i.e. I don't know if an upgrade was available from Tek.

For a full upgrade the rear panel (with the fan opening and keyboard socket) would have to be replaced as well, since the two backup power banana sockets would go and a switch installed to allow selecting either running on backup power (Li battery) or restarting with system test after power up. The difference is obvious between the original version and the new version rear panel.

I do know that it's quite easy to modify the computer main board to accomodate the new integrated ROM/RAM board: Only one power supply wire need be connected to an unused connector main board pin. The old boards will work in the new model but not vice versa without installing the (power) wire.

One of my 7854's is a late version separate ROM/RAM version with new GPIB software ("1.03") in non-Mostek ROMs. Apart from the apparently improved GPIB handling, replacing the deteriorating Mostek ROMs could be an advantage. So, the OP could be lucky on two levels: Old Mostek separate ROM/RAM, old non-Mostek separate ROM/RAM, new integrated Li-backup ROM/RAM board.

Raymond


Re: 7904 - Very Dim Trace

David DiGiacomo
 

On Mon, Feb 15, 2016 at 10:31 PM, David <@DWH> wrote:
agree that your proposed steps are the way to go. The z-axis DC
restorer is the most likely suspect so replace or rebuild the z-axis
board
Except the DC restorer is in the high voltage module, not on the Z-axis board...