Date   

Re: Tektronix tool box, 016-0362-02 in the 5000-series o'scopes

magnustoelle
 

Hello David,

yes, that would be me :-)

A standard O-ring 8 mm x 2mm is all it needs.

See http://groups.yahoo.com/neo/groups/TekScopes/photos/albums/85295469

Works.

Cheers,

Magnus


Re: Tek 7854 Doesn't Come On After EPROM ROM Replacement

 

On Thu, 30 Jan 2014 16:54:09 -0500, you wrote:

On 01/30/2014 04:16 PM, David wrote:

That will certainly work. Essentially you end up with a 2 port ROM
where only 1
port is available at any time. The address, data, and some of the
control lines
need to be multiplexed but that is not too difficult.

The same thing could be done with NVSRAM of one type or another or
even EEPROM.

I think there are some parallel access Flash memories which allow serial
programming via JTAG or something.

On 30 Jan 2014 11:55:08 -0800, you wrote:

I was going to whip a few boards up here at work as a proof of
concept (fortunate enough to have a CNC PCB milling machine on-site).
This article got me thinking about this problem again:
http://petenpaja.blogspot.ca/2014/01/vic-20-flash-memory-programmer-part-12.html
http://petenpaja.blogspot.ca/2014/01/vic-20-flash-memory-programmer-part-12.html
Why not just use a ATMEGA644 or even a Arduino Mega 2560 board?
Plenty of pins available so no multiplexing or shift register hacks needed.
I mean the multiplexing of the memory address, data, and control lines of the
memory itself. The alternative is to use a dual port memory but that is a lot
more specialized.

I have not seen one in a while but they used to make products like this for
general purpose embedded development work. They simulated a set of ROMs using
SRAM which you could access directly from the development machine so code could
be uploaded very quickly. The more sophisticated ones even monitored the
address and data bus via the memory connection which allowed breakpoints and
other debugging tools to be used.


Re: 2465b powered up, Error 76 Fail 01 - DMM option

Maxime Nosek <nosek75@...>
 

Thanks Tom,

I wasn't really sure while reading the schematics. Thanks for clarifying.

As I am not a professional, what would be the suggested way of troubleshooting the error ?

I am unsure as well what kind of signal AMPS ST is...

Max


To: TekScopes@...
From: tmiller11147@...
Date: Thu, 30 Jan 2014 11:15:30 -0500
Subject: Re: [TekScopes] 2465b powered up, Error 76 Fail 01 - DMM option

 

Pin 2 is the X-6 input and is marked AMPS ST.
 
Tom
 

----- Original Message -----
Sent: Thursday, January 30, 2014 9:57 AM
Subject: RE: [TekScopes] 2465b powered up, Error 76 Fail 01 - DMM option [1 Attachment]

 

I am looking at the schematics right now to trace the expected signal on pin 2 of U5020, according to the datashet pin2 of the MC14051 is X6 IN/OUT. I have some trouble reading the schematics ar misleading (at least to me).

I have attached a pic of the service manual, could someone tell me which is pin2 pls ? I guess it's DC 10 according to pin-out, but not sure..

 


To: tekscopes@...
From: nosek75@...
Date: Thu, 30 Jan 2014 15:17:18 +0100
Subject: RE: [TekScopes] 2465b powered up, Error 76 Fail 01 - DMM option

 

Dave,

thanks for chiming in, just for the record, I just checked again, and the chip is MC14051 on both 2465 (non b) and 2465B - don't have a clue why I ordered something different...

The 76-01 is indeed the only failure, so I am with you... either the chip is bad, which I am doubting more and more, or pin 2 is not getting any input....

Should I order one and swap it out and then go from there ?

Max


To: TekScopes@...
From: manuals@...
Date: Thu, 30 Jan 2014 08:07:33 -0600
Subject: Re: [TekScopes] 2465b powered up, Error 76 Fail 01 - DMM option

 

Max

According to 2465B Options Service info on  DMM 76-01 is  "Malfunction of DMM or if this is the only failure , V/F input Multiplexer U5020 Input pin 2" .

 So I guess it could also imply that pin2 is not getting a signal OR the chip is bad????

Dave
ArtekManuals

On 1/30/2014 7:49 AM, Maxime Nosek wrote:
 

Hi All,

back after long time....

After reading the 2465 (non B) manual telling me that my error would be the U5020 chip going bad I ordered one according to the manual...

Now I have opened up my 2465b in order to change the chip but of here's the trouble:

U5020 on the 2465 with DMM option is a MC14052BCP (SP8T) according to the manual (and of coarse the one I ordered!) while the U5020 on the 2465b is a MC14051BCP (DP4T).

Now I am totally willing to order the correct chip, but would like to know if someone here has the manual for the DMM option on the 2465b and could confirm that error 76 fail 01 refers to the same U5020 ...

Any help is highly appreciated!

Max


To: tekscopes@...
From: nosek75@...
Date: Wed, 9 Jan 2013 00:06:07 +0000
Subject: RE: [TekScopes] Thanks to all! PSU recap worked, 2465b powered up, Error 76 Fail 01

 

Well,
 
I couldn't find a service manual for the DMM option for the 2465B unit, only for the 2465!
 
A copy is attached. I am pretty sure the DMM module is the same or at least very similar, if anyone here more info on this matter it's highly appreciated.
 
Will check further what the U5020 chip is, as I don't have any further errors on start-up.
 
Cheers,
 
Max
 

To: tekscopes@...
From: nosek75@...
Date: Tue, 8 Jan 2013 21:19:58 +0000
Subject: [TekScopes] Thanks to all! PSU recap worked, 2465b powered up, Error 76 Fail 01

 
Hi all,

thanks a lot to all of you that helped me with my cap issue in the PSU of my tek 2465B scope.

After recapping the boards and touching up some dry solder joints the Scope powered up for the first time!

While I must say that working on the PCB is a real pleasure as far as built quality is concerned, assembling the unit is quite a pita...

After start-up it goes in diag mode and shows me "DM TEST 76 FAIL 01", I haven't checked any further for now, hope it's nothing serious!

Is that midi three-tone normal ?

Cheers,

Max





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



This email is free from viruses and malware because avast! Antivirus protection is active.







Re: [hp_agilent_equipment] Compactron tubes in HP or Tek instruments?

John Atwood
 

The 556 dual-beam scope uses several 6M11 tubes (dual triode + pentode) as well as two 6GF5 tubes (beam power tube).  As far as I know, this is the only Tek scope that uses compactrons.


I've got a 556, and am looking for spares, both the 6M11, 6GF5, and the 8608 (used as the vertical output amps).


- John Atwood


Re: Compactron tubes in HP or Tek instruments?

Don Black <donald_black@...>
 

I think the 6M11 is a dual triode Pentode.

Don Black.

On 31-Jan-14 5:13 PM, ditter2@... wrote:
 

I don't think any are used in the vertical amplifiers of either the 547 or 556 (which are nearly identical designs BTW), as these are all transistorized, except the first stage cathode follower which is a 12AT7.  The other tubes in the 547 are all single and dual sided tubes commonly used in several Tek scopes.


The 556 uses two 6M11 triple triodes, one in each sweep generator.


There is a novel miller integrator sweep generator design which can be implemented as a one tube design using a combination pentode-triode tube.  The Miller integrator itself is named a "Phastastitron" short for fantastic.  This cleaver design uses a single pentode for all of the functions of the sweep generator, including the cut off diodes and synchronization (rather than triggered operation.) The screens are used as additional grids in this design.  The triode serves as a cathode follower, to prevent the external load from altering the timing linearity.  Tek never used this design, as all Tek scopes have triggered rather than synchronized to the input signal.  It is useful if you want to design one of those “three tube scopes”.

 

- Steve





This email is free from viruses and malware because avast! Antivirus protection is active.



Re: Compactron tubes in HP or Tek instruments?

ditter2
 

I don't think any are used in the vertical amplifiers of either the 547 or 556 (which are nearly identical designs BTW), as these are all transistorized, except the first stage cathode follower which is a 12AT7.  The other tubes in the 547 are all single and dual sided tubes commonly used in several Tek scopes.


The 556 uses two 6M11 triple triodes, one in each sweep generator.


There is a novel miller integrator sweep generator design which can be implemented as a one tube design using a combination pentode-triode tube.  The Miller integrator itself is named a "Phastastitron" short for fantastic.  This cleaver design uses a single pentode for all of the functions of the sweep generator, including the cut off diodes and synchronization (rather than triggered operation.) The screens are used as additional grids in this design.  The triode serves as a cathode follower, to prevent the external load from altering the timing linearity.  Tek never used this design, as all Tek scopes have triggered rather than synchronized to the input signal.  It is useful if you want to design one of those “three tube scopes”.

 

- Steve


Re: J122-1 on 2465A ps

 

I FOUND IT.  P122-1 is the Line signal for Line Trigger.  It is called out on the upper right of the inverter schematic.  Took me a while but its there.

From: jerry massengale
To: TekScopes@...
Sent: Thursday, January 30, 2014 8:13 PM
Subject: Re: [TekScopes] J122-1 on 2465A ps

 
There is a signal sized trace coming from the pin to a via. I could separate the boards and try to follow the trace but hoped someone knew. I looked carefully on the schematics but have not found it yet. Thanks
Jerry Massengale

-----Original Message-----
From: machine guy
To: TekScopes
Sent: Thu, Jan 30, 2014 4:51 pm
Subject: Re: [TekScopes] J122-1 on 2465A ps

 
I think it may be unused.  My cursory examination did not find any reference in the Service Manual to Pin 1 of J122 or its mate P122.  Perhaps someone with their scope open can buzz it out for you. 
From: jerry massengale <j_massengale@...>
To: tekscopes@...
Sent: Thursday, January 30, 2014 2:21 PM
Subject: [TekScopes] J122-1 on 2465A ps

 
Hi,
 
I am looking for the connection for pin1 of j122 on the low voltage power supply.
Jerry Massengale






Re: [hp_agilent_equipment]Re-sent: Compactron tubes in HP or Tek instruments?

Brad Thompson <brad.thompson@...>
 


On 1/30/2014 3:38 PM, Daniel Koller wrote:
 
Howdy all,

  I'm going through my dad's collection of vacuum tubes and sorting through them.   I have a large number of used (pulls) "Compactron" type receiving tubes, and a smaller number of NIB Compactrons, as well as other tubes specific to TV sets of the day (1960's I presume).

   I'm thinking of unloading all of these cheaply on e-bay or some such thing, but before I do, are there any of them that I should save?  Are there any specific Compactron tubes that were used in later tube-era HP or Tek (or any other manufacturer's) instruments that I should keep in stock in the event I come across such an instrument some day?

  I'd rather get these into the hands of someone who will use them rather than store them.

Hello, Dan--

IIRC, one of Tektronix's scopes used Compactrons in the vertical-amplifier chain
but I don't recall which scope used them or what their type numbers were. I
may be wrong, so I hope that other group members will comment.

As for the relative worth of Compactrons, certain type numbers command
a premium price (e.g., the 6C10 triple triode (used in some Heathkits) and
the 6D10). Again IIRC, there's one beam-power pentode that appeals to the
tube audio crowd ('nuf said).  There are also several sweep-tube Compactrons
that would make interesting finals (as in certain CB linears). Finally, there's
the 6LQ6 which has a different base (9 pins)-- it's another sweep tube used
in various RF linear amplifiers (and it's expensive).

Don't overlook the possibility of building some older circuits using
Compactrons-- for example, shrinking a six-tube receiver down to three
or maybe two Compactrons. There's fun to be had!

Last of all, Compactrons with odd heater voltages tend to be much
less expensive than the 6- and 12-volt versions. Too many tube-equipment
builders get fixated on "standard" heater voltages and abandon projects
when they review the cost of those tubes.
 
To learn  more about Compactrons, go here(*):

www dot junkbox dot com / electronics / CompactronTubesIndex dot shtml

I have a feeling that Yahoo blocked my earlier version of this message because it
included an address outside of Yahoo's purview. We wouldn't anyone wandering
outside of the game preserve, would we?

73--

Brad  AA1IP



This email is free from viruses and malware because avast! Antivirus protection is active.



Re: J122-1 on 2465A ps

 

There is a signal sized trace coming from the pin to a via. I could separate the boards and try to follow the trace but hoped someone knew. I looked carefully on the schematics but have not found it yet. Thanks
Jerry Massengale

-----Original Message-----
From: machine guy
To: TekScopes
Sent: Thu, Jan 30, 2014 4:51 pm
Subject: Re: [TekScopes] J122-1 on 2465A ps

 
I think it may be unused.  My cursory examination did not find any reference in the Service Manual to Pin 1 of J122 or its mate P122.  Perhaps someone with their scope open can buzz it out for you. 
From: jerry massengale <j_massengale@...>
To: tekscopes@...
Sent: Thursday, January 30, 2014 2:21 PM
Subject: [TekScopes] J122-1 on 2465A ps

 
Hi,
 
I am looking for the connection for pin1 of j122 on the low voltage power supply.
Jerry Massengale




Re: J122-1 on 2465A ps

 

I think it may be unused.  My cursory examination did not find any reference in the Service Manual to Pin 1 of J122 or its mate P122.  Perhaps someone with their scope open can buzz it out for you. 

From: jerry massengale
To: tekscopes@...
Sent: Thursday, January 30, 2014 2:21 PM
Subject: [TekScopes] J122-1 on 2465A ps

 
Hi,
 
I am looking for the connection for pin1 of j122 on the low voltage power supply.
Jerry Massengale




Re: Compactron tubes in HP or Tek instruments?

Christopher Hilton-Johnson
 

I 'think' that the 547 used a compactatron and the 556 used several. No current access to manuals or to the scopes & memory is not what it was.

Chris HJ

On 30/01/2014 15:38, Daniel Koller wrote:
 
Howdy all,

  I'm going through my dad's collection of vacuum tubes and sorting through them.   I have a large number of used (pulls) "Compactron" type receiving tubes, and a smaller number of NIB Compactrons, as well as other tubes specific to TV sets of the day (1960's I presume).

   I'm thinking of unloading all of these cheaply on e-bay or some such thing, but before I do, are there any of them that I should save?  Are there any specific Compactron tubes that were used in later tube-era HP or Tek (or any other manufacturer's) instruments that I should keep in stock in the event I come across such an instrument some day?

  I'd rather get these into the hands of someone who will use them rather than store them.

  Dan



Re: tek 465 faulty again!

Albert Otten
 

Hi Vitor,

Good that you found the culprit but not good for my self-esteem ;=).
I now think that you measured an increasing current up to 1 A before the -8 V collapsed to -2 V, without saying that the current also dropped after the voltage collapsed. About 1 A is the maximum current at full output voltage.

Albert


Re: Compactron tubes in HP or Tek instruments?

Daniel Koller
 

Definitely no Nuvistors in the lot.  Those I would pull out as a matter of course, and they are easy enough to store.

Dan

On Thursday, January 30, 2014 4:24 PM, "bonddaleena@aol.com" <bonddaleena@aol.com> wrote:

 
Hi Dan, one of the tubes types that I purchased a bunch of spares for, were the Nuvistor series. 6CW4, 6DS4, etc. These can bring low or high prices on eBay, depending on your 'salesmanship'....Can't say that I have anything that use the 'compactrons'...... You can always use eBay's 'completed' listings for any tube type. This will give you a good idea what they are 'worth'....

ron
N4UE







-----Original Message-----
From: Daniel Koller <kaboomdk@yahoo.com>
To: TekScopes <TekScopes@yahoogroups.com>; hp_agilent_equipment <hp_agilent_equipment@yahoogroups.com>
Sent: Thu, Jan 30, 2014 3:38 pm
Subject: [TekScopes] Compactron tubes in HP or Tek instruments?


 
Howdy all,


  I'm going through my dad's collection of vacuum tubes and sorting through them.   I have a large number of used (pulls) "Compactron" type receiving tubes, and a smaller number of NIB Compactrons, as well as other tubes specific to TV sets of the day (1960's I presume).


   I'm thinking of unloading all of these cheaply on e-bay or some such thing, but before I do, are there any of them that I should save?  Are there any specific Compactron tubes that were used in later tube-era HP or Tek (or any other manufacturer's) instruments that I should keep in stock in the event I come across such an instrument some day?


  I'd rather get these into the hands of someone who will use them rather than store them.


  Dan





Re: Tek 7854 Doesn't Come On After EPROM ROM Replacement

Bert Haskins
 

On 01/30/2014 04:16 PM, David wrote:
 

That will certainly work. Essentially you end up with a 2 port ROM where only 1
port is available at any time. The address, data, and some of the control lines
need to be multiplexed but that is not too difficult.

The same thing could be done with NVSRAM of one type or another or even EEPROM.

I think there are some parallel access Flash memories which allow serial
programming via JTAG or something.

On 30 Jan 2014 11:55:08 -0800, you wrote:

>I was going to whip a few boards up here at work as a proof of concept (fortunate enough to have a CNC PCB milling machine on-site). This article got me thinking about this problem again: http://petenpaja.blogspot.ca/2014/01/vic-20-flash-memory-programmer-part-12.html http://petenpaja.blogspot.ca/2014/01/vic-20-flash-memory-programmer-part-12.html

Why not just use a ATMEGA644 or even a Arduino Mega 2560 board?
Plenty of pins available so no multiplexing or shift register hacks needed.






Re: [hp_agilent_equipment] Compactron tubes in HP or Tek instruments?

Brad Thompson <brad.thompson@...>
 


On 1/30/2014 3:38 PM, Daniel Koller wrote:
 
Howdy all,

  I'm going through my dad's collection of vacuum tubes and sorting through them.   I have a large number of used (pulls) "Compactron" type receiving tubes, and a smaller number of NIB Compactrons, as well as other tubes specific to TV sets of the day (1960's I presume).

   I'm thinking of unloading all of these cheaply on e-bay or some such thing, but before I do, are there any of them that I should save?  Are there any specific Compactron tubes that were used in later tube-era HP or Tek (or any other manufacturer's) instruments that I should keep in stock in the event I come across such an instrument some day?

  I'd rather get these into the hands of someone who will use them rather than store them.

Hello, Dan--

IIRC, one of Tektronix's scopes used Compactrons in the vertical-amplifier chain
but I don't recall which scope used them or what their type numbers were. I
may be wrong, so I hope that other group members will comment.

As for the relative worth of Compactrons, certain type numbers command
a premium price (e.g., the 6C10 triple triode (used in some Heathkits) and
the 6D10). Again IIRC, there's one beam-power pentode that appeals to the
tube audio crowd ('nuf said).  There are also several sweep-tube Compactrons
that would make interesting finals (as in certain CB linears). Finally, there's
the 6LQ6 which has a different base (9 pins)-- it's another sweep tube used
in various RF linear amplifiers (and it's expensive).

Don't overlook the possibility of building some older circuits using
Compactrons-- for example, shrinking a six-tube receiver down to three
or maybe two Compactrons. There's fun to be had!

Last of all, Compactrons with odd heater voltages tend to be much
less expensive than the 6- and 12-volt versions. Too many tube-equipment
builders get fixated on "standard" heater voltages and abandon projects
when they review the cost of those tubes.
 
To learn  more about Compactrons, go here:

http://www.junkbox.com/electronics/CompactronTubesIndex.shtml

73--

Brad  AA1IP



This email is free from viruses and malware because avast! Antivirus protection is active.



Re: Tek 7854 Doesn't Come On After EPROM ROM Replacement

 

That will certainly work. Essentially you end up with a 2 port ROM where only 1
port is available at any time. The address, data, and some of the control lines
need to be multiplexed but that is not too difficult.

The same thing could be done with NVSRAM of one type or another or even EEPROM.

I think there are some parallel access Flash memories which allow serial
programming via JTAG or something.

On 30 Jan 2014 11:55:08 -0800, you wrote:

I was going to whip a few boards up here at work as a proof of concept (fortunate enough to have a CNC PCB milling machine on-site). This article got me thinking about this problem again: http://petenpaja.blogspot.ca/2014/01/vic-20-flash-memory-programmer-part-12.html http://petenpaja.blogspot.ca/2014/01/vic-20-flash-memory-programmer-part-12.html


Re: Compactron tubes in HP or Tek instruments?

bonddaleena@...
 

Hi Dan, one of the tubes types that I purchased a bunch of spares for, were the Nuvistor series. 6CW4, 6DS4, etc. These can bring low or high prices on eBay, depending on your 'salesmanship'....Can't say that I have anything that use the 'compactrons'...... You can always use eBay's 'completed' listings for any tube type. This will give you a good idea what they are 'worth'....

ron
N4UE



-----Original Message-----
From: Daniel Koller
To: TekScopes ; hp_agilent_equipment
Sent: Thu, Jan 30, 2014 3:38 pm
Subject: [TekScopes] Compactron tubes in HP or Tek instruments?

 
Howdy all,

  I'm going through my dad's collection of vacuum tubes and sorting through them.   I have a large number of used (pulls) "Compactron" type receiving tubes, and a smaller number of NIB Compactrons, as well as other tubes specific to TV sets of the day (1960's I presume).

   I'm thinking of unloading all of these cheaply on e-bay or some such thing, but before I do, are there any of them that I should save?  Are there any specific Compactron tubes that were used in later tube-era HP or Tek (or any other manufacturer's) instruments that I should keep in stock in the event I come across such an instrument some day?

  I'd rather get these into the hands of someone who will use them rather than store them.

  Dan


Compactron tubes in HP or Tek instruments?

Daniel Koller
 

Howdy all,

  I'm going through my dad's collection of vacuum tubes and sorting through them.   I have a large number of used (pulls) "Compactron" type receiving tubes, and a smaller number of NIB Compactrons, as well as other tubes specific to TV sets of the day (1960's I presume).

   I'm thinking of unloading all of these cheaply on e-bay or some such thing, but before I do, are there any of them that I should save?  Are there any specific Compactron tubes that were used in later tube-era HP or Tek (or any other manufacturer's) instruments that I should keep in stock in the event I come across such an instrument some day?

  I'd rather get these into the hands of someone who will use them rather than store them.

  Dan


J122-1 on 2465A ps

 

Hi,
 
I am looking for the connection for pin1 of j122 on the low voltage power supply.
Jerry Massengale


Re: tek 465 faulty again!

vitor pinto
 

I finally found the culprit which is tantalum capacitor c102 6.8uf 35v on CH1 vertical preamp circuit board,
This capacitor has given me some headaches on this scope.
Now it is working again as it should be.
Thanks everyone for helping me on this repair.

89521 - 89540 of 192862