Re: Salty 468 update

Ciphair

I replaced the U506 on the interface board, part number was MC1458N. I cleaned it as best I could with water and compressed air. It's not perfect but it doesn't smell nearly as bad when switched on now :)

The only thing still giving trouble are the volts/div selector switches. They do work but are very finicky. Calibration seems to be good enough for my purposes.

The storage part still works excellent to my surprise.

Thanks again,

Show quoted text

On 01/18/2013 12:41 AM, Tom Jobe wrote:
Hi Ciphair,
Congratulations on the repair of your 468!
But what did you replace with what?
It has been awhile since you last reported on your progress.
tom jobe...



   ----- Original Message -----
   From: Ciphair
   To: TekScopes@...
   Sent: Thursday, January 17, 2013 1:43 PM
   Subject: Re: [TekScopes] Salty 468 update



   Finally got around to replacing it today and it came back to live
   immediately! +5v is spot on as well :)

   Thanks for all the help

   

R7103 backplane repair

Peter Gottlieb

#86239

A number of months ago I picked up a R7103 on ebay for a very good price as it didn't power up (shipping cost me as much as the purchase price).  It seemed like something worth a gamble.  I quickly found the problem to be the left vertical plug-in connector which was missing its outer plastic pieces, and the contacts were touching.  A temporary piece of plastic inserted allowed the scope to power up and I happily found that the CRT was in excellent condition and the rest of the scope looked to be completely functional.  I had to put it aside until I found my spare Tek parts and that happened a few days ago.

Unfortunately, on closer examination, I realized that most of the contacts in that connector were bent, doubled up, and even broken as someone had apparently jammed a plug-in in there at some point.  I thought I would give it a shot to try and fix it...

I had a backplane from another rack mount 7k scope which I had parted out (don't cringe, it was unrecoverable due to a broken CRT and serious chassis damage courtesy of United Parcel Smashers).

To do the repair I had to remove the backplane from the scope, taking digital photos of all connections, routing, and mounting.  I also wrote down where things went and labelled cables.  I also removed and set aside the two boards attached to the backplane.  I used ESD precautions.

Very fortunately, the special signal contacts were undamaged as that would have been a whole 'nother level of repair.  I used a Pace desoldering station to salvage good contacts (there are two different types).  These must be treated gently!  I similarly removed the damaged ones from the 7103 backplane.  I discovered that the plastic sides, which are required, grab on on the rear of the connector and that when soldering in replacement contacts you need to make sure that the contact is fully against the rear of the connector or the side piece will not stay in place as it can't latch.

After very careful inspection and mating tests with a plugin out in the open I reinstalled everything and double checked connections.

Problem:  Intensity was uncontrollable and really bright.  Unit went into protection.  Checked power supplies, all EXACTLY on (as in, to 3 places after the decimal point).  The manual showed Z-axis going through Peltrola connectors on the backplane so I disconnected and reconnected both of them (nothing looked wrong though?) and that was it, everything came up perfectly.  I tried the operation of the repaired slot and it works perfectly.  What an amazing scope.

I think it was worth the several hours it took me to do this repair, and it was something I think others can do as well even if for the first time, so don't despair if you find yourself in a similar situation, it is quite repairable if you can find a source of the contacts such as I did and have a little patience.

Peter

Re: CATS software for 11302A

#86238

--- In TekScopes@..., "jlnhab"  wrote:

Hi All,

I am seeking the CATS (Computer Aided Test System) program
for a 11302A.
Any clue?
Thanks for your time.

Bye,
Jean-Louis
Reply to me off list for a copy./H?kan

Re: Looking for two parts from 53x or early 54x scope

Rob

#86237

开云体育

I had meant to offer this to the forum earlier but your current dilemma reminded me.

?

I recently acquired a significant amount of 1/4W-20W+ resistors in various Ohms from single digits to several Meg... A very high percentage these are carbon composite, old style ceramic etc. I would gladly go through these resistors and find suitable values and manufacturing style for forum members and send them if I have them.

?

In this case. It sounds like the originals will not be something in the acquisition. However, I would think I can get you values and wattages that may fit the space you have.

?

Just let me know if I an assist.

Rob

?

Show quoted text

From: TekScopes@... [mailto:TekScopes@...] On Behalf Of Steve
Sent: Friday, January 18, 2013 1:31 AM
To: TekScopes@...
Subject: [TekScopes] Re: Looking for two parts from 53x or early 54x scope

?

--- In TekScopes@..., David Wise wrote:
>
> Better cobble up some temporary loads from standard resistors, until you're sure the surrounding circuit won't kill them. They'll work at moderate sweep speeds so you can test and debug.
>
> Dave Wise
>

Dave,

Thank you for the excellent suggestion.

I figured I can build a network from four 2 Watt carbon comp. resistors, physically arranged in a Z configuration. It looks like it will even fit in the existing space with some gap between each resistor. This should allow me to get nearly the full 8 watt possible dissipation. Since the horizontal BW is only 240 kHz, I don't think parasitic capacitance will be much of an issue, although the impedances are high so it is not insignificant.

I did some calculations that show the peak power dissipated in normal sweep operation or static movement of the beam when not triggered is within the 5 W rating of the existing resistors, but not by a large margin (4.67W for the 25 kOhm one.) However, the amplifier will be driven beyond this range when in the 5X sweep magnifier is used, or if a high amplitude external horizontal signal is applied to the input. There is no provision to clamp the tubes at a safe plate voltage. In addition to the potential to destroy the plate resistors, this condition will exceed the maximum plate current specification.

- Steve

Re: Looking for two parts from 53x or early 54x scope

#86236

--- In TekScopes@..., David Wise  wrote:

Better cobble up some temporary loads from standard resistors, until you're sure the surrounding circuit won't kill them.  They'll work at moderate sweep speeds so you can test and debug.

Dave Wise
Dave,

Thank you for the excellent suggestion.

I figured I can build a network from four 2 Watt carbon comp. resistors, physically arranged in a Z configuration.  It looks like it will even fit in the existing space with some gap between each resistor.  This should allow me to get nearly the full 8 watt possible dissipation.  Since the horizontal BW is only 240 kHz, I don't think parasitic capacitance will be much of an issue, although the impedances are high so it is not insignificant.

I did some calculations that show the peak power dissipated in normal sweep operation or static movement of the beam when not triggered is within the 5 W rating of the existing resistors, but not by a large margin (4.67W for the 25 kOhm one.)  However, the amplifier will be driven beyond this range when in the 5X sweep magnifier is used, or if a high amplitude external horizontal signal is applied to the input.  There is no provision to clamp the tubes at a safe plate voltage.  In addition to the potential to destroy the plate resistors, this condition will exceed the maximum plate current specification.

- Steve

Re: 7104 Horizontal Amplifier

#86235

Chris,

   U1094 is held in contact by a frame and some sort of elastomeric pad.  There are instructions starting at page 4-30 in the service manual (070-2314-00) on how to deal with this "HYPCON" connection.

  I suspect that the pin 3 connection has gone open, removing the main ground path to the chip.  With luck, this connection break is not inside the hybrid but at the accessible HYPCON contacts.  Following the manual directions, carefully remove the hybrid, clean the contacts with isopropyl alcohol (91% or more), dry, and reassemble.

--John Gord

Show quoted text

--- In TekScopes@..., "chrismh_somenumber"  wrote:

Another Update:

I've worked my way down the horizontal amplifier board, checking all voltages and waveform test points.  Everything was looking good until I reached U1082.  The voltages at many of the pins were high.

Suspecting a problem with the readout, I removed Q1052 and Q1072, connecting the pads from emitter to collector with a wire.  (This is recommended in the service manual, page 3-57, to remove the feedback path).

More of the voltages around U1082 were OK after that change (15, 17, 18, 19 were still high), but TP1038 and TP1078 were still high.  I lifted the collectors of Q1028 and Q1034 to remove the readout positioning, but that did not change TP1038 and TP1039.

The voltages around U1094 are all wrong.  Most read .5 to 1 volt high.  Pins 13 and 14 read 4.5V high, and pin 3 reads 0V (it should be 4.2V).  The output waveform going into the CRT (test points 5 and 6) is a flat line.

I checked component values around U1094 and they seemed OK.  The

Is it likely that U1094 is bad?  The U1014 OpAmp appears to be op-amping, and its supply voltage is OK.  The voltages in that bit of circuitry utilizing U1094 are running a little high, but could that cause U1094 to not produce any output at all?

Thanks,
Chris

--- In TekScopes@..., "chrismh_somenumber"  wrote:

My recently acquired 7104 has a problem, which I assume is something to do with the horizontal amplifier (please feel free to correct me...).

When the scope starts up, I get a normal trace for about 3-5 minutes, then it changes to a compressed vertical line.  It appears that the vertical is working since I can make the vertical line grow and shrink (vertically) by varying the v/div or by varying the input signal.  However, the entire trace, and the readout, is compressed to a single vertical line.

Thoughts?

Thanks,
Chris

Re: Bench Built Isolation Transformer

Dave C

#86234

It's the fiddly little Test & Reset buttons on the front I'd like to somehow do away with. I like the Euro ones I've seen that are 2-pole and have a toggle handle.

Thanks,
Dave

-=-=-=-

On 17 January 2013, at 7:48 PM, n2ixk wrote:

A real electrical supply house (not the big orange or blue box stores) should carry them. What you want is called a "dead front" GFCI.

Amazon.com has them, as well:

Bob-=-=-=-

Where to find a 120vac RCD/GFI that is not a receptacle nor a circuit breaker (ie, not purpose-made to fit a load panel) for USA use?

240-mains countries have several nice in-line devices to choose from.

Thanks,
Dave

Re: Tektronix termination

#86233

On Thu, Jan 17, 2013 at 7:35 PM, David <dmacdonald@...> wrote:
Hi Group,

Can someone kindly provide specs for a Tek through termination, 011-032 5XT.These things were not well specified, probably because they were not
made by Tek, and they would change vendors from time to time.  It's
just a vanilla 5X attenuator.

Re: AM-6565/U and some other 7K questions

#86232

On Thu, Jan 17, 2013 at 8:04 PM, Rob <rgwood@...> wrote:
I know the number in the subject is a military 7000 series plug-in vertical.
I assume no readout. It is also single channel.

The question is which "normal" single channel vertical does it represent?
7A16, 7A15 or maybe 7A19?It's a 7A15AN11.  I collect this kind of information and post it on my website:



If anyone has some advice for how to go about  finding such things out side
of E-bay searches, I would like to have an off line chat. Please feel free
to send me a note and I will reply. I am getting to where I prefer trading
things if possible. I am however not sure it is ok to post those kind of
request here.I think it's fine.

Re: AM-6565/U and some other 7K questions

Rob

#86231

开云体育

Thank you David. I likely should have added the A after several of the verticals I mentioned. I sometimes have a tendency to run those two versions together in my mind. ?Your reply helps me a lot.

The 7854 is one I have not worked on. I envy you somewhat. It may be the one to supplant my favorite 7844 if I ever get a chance to work on one. I hope this finds you well

Thanks as always for the bandwidth.

Rob

?

Show quoted text

From: TekScopes@... [mailto:TekScopes@...] On Behalf Of David
Sent: Thursday, January 17, 2013 9:51 PM
To: TekScopes@...
Subject: Re: [TekScopes] AM-6565/U and some other 7K questions

?

On Thu, 17 Jan 2013 21:04:58 -0600, "Rob" rgwood@...>
wrote:

>I know the number in the subject is a military 7000 series plug-in vertical.
>I assume no readout. It is also single channel.
>
>The question is which "normal" single channel vertical does it represent?
>7A16, 7A15 or maybe 7A19?

The ones I have seen looked like 7A16A vertical amplifiers. The 7A16
is an older style that uses relays and push button switches instead of
slide switches and bipolar current switching.

>In the same vein, I had posted a question about 7D12 and associate M modules
>a week ago or so but didn't get any replies. Which leads me to believe they
>are relatively rare (or my questions were rude which if that is the case I
>apologize).

They are not very common.

>If anyone has some advice for how to go about finding such things out side
>of E-bay searches, I would like to have an off line chat. Please feel free
>to send me a note and I will reply. I am getting to where I prefer trading
>things if possible. I am however not sure it is ok to post those kind of
>request here.

My cursory watching has only seen one sell on Ebay and only a couple
more advertised. I passed them by since I have a 7854 and some other
DSOs.

Re: 7104 Horizontal Amplifier

chrismh_somenumber

#86230

Another Update:

I've worked my way down the horizontal amplifier board, checking all voltages and waveform test points.  Everything was looking good until I reached U1082.  The voltages at many of the pins were high.

Suspecting a problem with the readout, I removed Q1052 and Q1072, connecting the pads from emitter to collector with a wire.  (This is recommended in the service manual, page 3-57, to remove the feedback path).

More of the voltages around U1082 were OK after that change (15, 17, 18, 19 were still high), but TP1038 and TP1078 were still high.  I lifted the collectors of Q1028 and Q1034 to remove the readout positioning, but that did not change TP1038 and TP1039.

The voltages around U1094 are all wrong.  Most read .5 to 1 volt high.  Pins 13 and 14 read 4.5V high, and pin 3 reads 0V (it should be 4.2V).  The output waveform going into the CRT (test points 5 and 6) is a flat line.

I checked component values around U1094 and they seemed OK.  The

Is it likely that U1094 is bad?  The U1014 OpAmp appears to be op-amping, and its supply voltage is OK.  The voltages in that bit of circuitry utilizing U1094 are running a little high, but could that cause U1094 to not produce any output at all?

Thanks,
Chris

Show quoted text

--- In TekScopes@..., "chrismh_somenumber"  wrote:

My recently acquired 7104 has a problem, which I assume is something to do with the horizontal amplifier (please feel free to correct me...).

When the scope starts up, I get a normal trace for about 3-5 minutes, then it changes to a compressed vertical line.  It appears that the vertical is working since I can make the vertical line grow and shrink (vertically) by varying the v/div or by varying the input signal.  However, the entire trace, and the readout, is compressed to a single vertical line.

Thoughts?

Thanks,
Chris

Re: Bench Built Isolation Transformer

#86229

Given the higher price, I would just go with the standard duplex GFCI
since it is in the same form factor.  The specialty items always seem
to be priced for an unlimited budget.

On Fri, 18 Jan 2013 03:48:00 -0000, "n2ixk" <bob.weiss@...>
wrote:

A real electrical supply house (not the big orange or blue box stores) should carry them. What you want is called a "dead front" GFCI.

Amazon.com has them, as well:

73,
Bob Weiss N2IXK

--- In TekScopes@..., Dave C  wrote:

Where to find a 120vac RCD/GFI that is not a receptacle nor a circuit breaker (ie, not purpose-made to fit a load panel) for USA use?

240-mains countries have several nice in-line devices to choose from.

Thanks,
Dave

Re: AM-6565/U and some other 7K questions

#86228

On Thu, 17 Jan 2013 21:04:58 -0600, "Rob" <rgwood@...>
wrote:

I know the number in the subject is a military 7000 series plug-in vertical.
I assume no readout. It is also single channel.

The question is which "normal" single channel vertical does it represent?
7A16, 7A15 or maybe 7A19?The ones I have seen looked like 7A16A vertical amplifiers.  The 7A16
is an older style that uses relays and push button switches instead of
slide switches and bipolar current switching.

In the same vein, I had posted a question about 7D12 and associate M modules
a week ago or so but didn't get any replies. Which leads me to believe they
are relatively rare (or my questions were rude which if that is the case I
apologize).They are not very common.

If anyone has some advice for how to go about  finding such things out side
of E-bay searches, I would like to have an off line chat. Please feel free
to send me a note and I will reply. I am getting to where I prefer trading
things if possible. I am however not sure it is ok to post those kind of
request here.My cursory watching has only seen one sell on Ebay and only a couple
more advertised.  I passed them by since I have a 7854 and some other
DSOs.

Re: Bench Built Isolation Transformer

n2ixk

#86227

A real electrical supply house (not the big orange or blue box stores) should carry them. What you want is called a "dead front" GFCI.

Amazon.com has them, as well:

73,
Bob Weiss N2IXK

Show quoted text

--- In TekScopes@..., Dave C  wrote:

Where to find a 120vac RCD/GFI that is not a receptacle nor a circuit breaker (ie, not purpose-made to fit a load panel) for USA use?

240-mains countries have several nice in-line devices to choose from.

Thanks,
Dave

AM-6565/U and some other 7K questions

Rob

#86226

I know the number in the subject is a military 7000 series plug-in vertical.
I assume no readout. It is also single channel. 

The question is which "normal" single channel vertical does it represent?
7A16, 7A15 or maybe 7A19?

In the same vein, I had posted a question about 7D12 and associate M modules
a week ago or so but didn't get any replies. Which leads me to believe they
are relatively rare (or my questions were rude which if that is the case I
apologize). 

If anyone has some advice for how to go about  finding such things out side
of E-bay searches, I would like to have an off line chat. Please feel free
to send me a note and I will reply. I am getting to where I prefer trading
things if possible. I am however not sure it is ok to post those kind of
request here. 

I have some TM-500 modules and 7K modules that I would trade with people who
might be interested and/or have similar for trade. I would also consider
purchasing if you have some for sale especially if your close to Southern
Louisiana where we can keep shipping to a minimum. I do also have some 7000
mainframes and plug-ins I list on our infamous web site that I would highly
prefer go to people on this forum if they were interested. However, I have
thought posting them here to be in poor taste so have refrained. That said,
I would certainly reply to any off forum inquiry.    

Thanks as always for the band width.
Rob

THM420 TekWaveMeter

scott_dixon

#86225

Just got one of these and I'm trying to find an owners manual.  I've checked the usual places online, did some Googling and asked Dave (Artekmedia) but no luck so far.  I've found a brief service manual at tek.com but nothing else.
Anyone have a (preferably) electronic copy of the owners manual for this unit?  Not that it seems that hard to figure out, but it never hurts to have the docs.
Thanks,
Scott

Tektronix termination

David

#86224

Hi Group,

Can someone kindly provide specs for a Tek through termination, 011-032 5XT.

Thanks!

David
VK2DNM

Re: 2465 - impending U800 failure?

#86223

--- In TekScopes@..., "cmjones012003"  wrote:
I could just about see the left hand end of the trace by winding the horizontal position all the way over to the left, and the scope was clearly still working otherwise: the bit of trace I could see responded to input signals and adjustments of the controls. I noticed also that pressing the 'beam find' button put the display back in the centre, but shrunken as I'd expect.

I tried the scope again a little later on and the display came back, but tried it again today and it worked for a few minutes then suddenly jumped off to the right again.

I do have the service manual for it, but before I start digging in, are these the typical symptoms of U800 failure? Searching the group, it seems that U800 failure tends to push the display to the left, and I haven't seen anyone document how 'beam find' behaves in that case.
Mine did exactly the same - and the effect of the beam finder was similar too. I bought a replacement from a helpful man in California (Ebay seller "2465b"). He advised me that the original IC was mounted with two lock washers between the package and the board. This is a BAD IDEA as it creates an air gap and prevents any cooling that may be had from contact with the board - bolt the replacement directly to the board surface. A little heatsink compound seems to help as well. I also reamed out some of the case cooling holes directly beneath the position of U800 to improve the incoming airflow.
 
There's usually several second-hand U800s on Ebay - but avoid the ones made by Maxim. Not as reliable as the original Tektronix ICs, I understand.

John
G4FDD

Re: 7104 Horizontal Amplifier

chrismh_somenumber

#86222

eBay, believe it or not.  This one didn't even have an exorbitant shipping charge attached to it.  $166.43 total, shipped to me.  Of course, it might be trashed inside, but the outside looks fairly clean, no broken knobs, etc.  No plugins.

The first one was eBay, too.  $150, but that one cost me $90 to ship.

Chris

Show quoted text

--- In TekScopes@..., John Griessen  wrote:

On 01/17/2013 11:34 AM, chrismh_somenumber wrote:
...and I just bought a second 7104 for $140. It powers onTell us a little more.  Maybe you'll have two of them.
That was a decent price for unknown-but-not-crushed-corroded-sand-blasted 7104.
What town has these deals?

Re: Salty 468 update

Tom Jobe

#86221

?

Hi Ciphair,

Congratulations on?the repair of your 468!

But what did you replace with what?

It has been awhile since you last reported on your progress.

tom jobe...

?

Show quoted text

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

From: Ciphair

To: TekScopes@...

Sent: Thursday, January 17, 2013 1:43 PM

Subject: Re: [TekScopes] Salty 468 update

?

Finally got around to replacing it today and it came back to live
immediately! +5v is spot on as well :)

Thanks for all the help