Re: Anyone Have a Peltola Socket?
I called and got a price. The center socket is $17.xx with a $30 minimum order. I guess I'll make do with what I have.
Thanks,
Barry - N4BUQ
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----- Original Message ----- From: "Barry" <n4buq@...>
To: "tekscopes" <[email protected]>
Sent: Friday, February 18, 2022 9:19:48 PM
Subject: Re: [TekScopes] Anyone Have a Peltola Socket? Wow. I had no idea those would still be available!
Thanks,
Barry - N4BUQ
----- Original Message -----
From: "David C. Partridge" <david.partridge@...>
To: "tekscopes" <[email protected]>
Sent: Friday, February 18, 2022 8:49:43 PM
Subject: Re: [TekScopes] Anyone Have a Peltola Socket? Tek still sell them
<>
-----Original Message-----
From: [email protected] <[email protected]> On Behalf Of n4buq
Sent: 19 February 2022 01:01
To: tekscopes <[email protected]>
Subject: [TekScopes] Anyone Have a Peltola Socket?
Just wondering if anyone knows where I might get one of the Peltola sockets. I
would like to replace one in one of the boards in my 7704A.
Thanks,
Barry - N4BUQ
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Re: Have I blown up my scope??
You are probably the coincidental recipient of the dreaded RIFA capacitor failure. "RIFA" is a brand of capacitors found in the RF filter section of the power supply input.
I'm not going to go into it, but search the group for threads. There is a ton of information on it here on the group. You'll learn symptoms, causes, fixes, see photos, etc.
Don't despair - it's not rocket science. Probably a good time to consider recapping your PSU. That's not too hard either, though a bit tedious. I don't want to provide false hope either, but I agree with the other folks...probably a total coincidence, and the "power on after 10 years" part was an unavoidable part of this kind of failure.
Just my opinion
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Re: Tektronix Equipment in San Diego Area--Practically FREE!!!!
I'd love to pick up a 3L10! If there happens to be one. ;-)
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Re: Tektronix Equipment in San Diego Area--Practically FREE!!!!
Kenn you got it almost right.? Drop the K6DDX and you are good to go. On Wednesday, February 23, 2022, 08:42:54 PM PST, Kenn Arnett <flyingdancingfool@...> wrote:
Bob I tried K6DDXbob91343@... twice with no email success. It pinged back twice
Kenn
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Re: Tektronix Equipment in San Diego Area--Practically FREE!!!!
Bob I tried K6DDXbob91343@... twice with no email success. It pinged back twice
Kenn
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Re: Have I blown up my scope??
Yes, it was just a coincidence. The probe ground clip is the same potential as the chassis. Now, if you happened to be poking around in a line voltage or power circuit, it would be a different story.
Since the scope had been sitting unused for a long time, a number of things could have happened some time after powering it up. I think what the others referred to sounds like the infamous Rifa or Wima brand epoxy-potted paper X-caps often used in the AC line EMC filtering of this vintage equipment. These are well known to be a problem, shorting out and melting down, making noxious fumes, and quite a mess sometimes. The good news is that although they tend to self-destruct, they usually do no further damage except for blowing the line fuse, and making a mess of the surrounding area. If you open it up and do careful inspection of the line side of the PS (with power cord unplugged), you should be able to spot the problem - you'll know it when you see it.
Having equipment with these caps sitting for a long time, especially in damp conditions, or being used in a "high voltage (line 240 V) country" tends to aggravate the situation.
Ed
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Re: Tektronix Equipment in San Diego Area--Practically FREE!!!!
Kenn I don't know how to PM you.? $10 each might be good but I have no idea of the inventory, etc.
Bob? K6DDXbob91343 - at - yahoo - dot - com
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On Wednesday, February 23, 2022, 07:44:26 PM PST, Kenn Arnett <flyingdancingfool@...> wrote:
Bob please PM me
Its an inheritance thing
Just go get em and give her $10 each, she will be happy
Kenn
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Re: Tektronix Equipment in San Diego Area--Practically FREE!!!!
Bob please PM me
Its an inheritance thing
Just go get em and give her $10 each, she will be happy
Kenn
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Re: Tektronix Equipment in San Diego Area--Practically FREE!!!!
Interesting.? Do you have any history on this stuff?? I would like to see an inventory to determine the advisability of making a trip to San Diego.
Bob
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On Wednesday, February 23, 2022, 06:38:10 PM PST, Kenn Arnett <flyingdancingfool@...> wrote:
Greetings. There is a lady in the San Diego area who has a *BUNCH* of Tektronix and other equipment she needs to clear out.
Apparently from a hoarder like us.
Please send me an email and I will post the contact information.
She will be there this weekend from noon till 4 pm (last I heard)
No unreasonable offers refused. There are some slide in spectrum analyzers.
She needs to CLEAR ALL THIS EQUIPMENT OUT
Lets help her out
Kenn
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Re: Have I blown up my scope??
As a note:? the smell of those capacitors is unique, and lingers.? They are not really needed for operation, but keep the scope from affecting other equipment on the same power line.? They are more prone to fail on 240 volt circuits than 110.? They are moderately easy to replace, and there are many threads explaining the problem and the solution.
The capacitors are designed to fail in such a manner that they do not short out (otherwise, the AC line is shorted).
the "10 years" is significant, since the parts can fail due to moisture in the air getting into the parts through small cracks.
Harvey
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On 2/23/2022 9:27 PM, n4buq wrote: I'd chalk it up to coincidence.
The power supply boards have snubber networks consisting of C1018, R1018, C1016 and R1016 that are across the mains. Those caps are known to blow out and smoke like you describe - some more violently than others. If you remove the covers and then the inner, top cover, the PS boards are visible and those caps are near the rear of the scope. Those would be my first suspects.
Thanks,
Barry - N4BUQ
----- Original Message -----
From: "ted webb 1942" <ted.webb.1942@...>
To: "tekscopes" <[email protected]>
Sent: Wednesday, February 23, 2022 7:47:09 PM
Subject: [TekScopes] Have I blown up my scope??
I was tinkering with an RF control circuit and couldn't get it to work. So I
dug out my Tek 2465 scope that hasn't been turned on in about ten years to do
some signal tracing. I plugged it into the handiest power outlet which
happened to be my computer surge suppressor power strip. Then I turned the
scope on, all seemed normal, I probed the scope's square wave voltage
calibrator, it looked pretty good, I wanted to optimize the square wave with
the probe adjustment, but didn't have a tuning tool handy. So I'm thinking to
myself, I'll just put the probe ground alligator clip to ground to see if the
square wave cleans up a bit. Around the time I placed the ground clip to the
outer shell of the channel input BNC, I heard loud pops and saw lots of smoke.
I didn't notice any sparking at the ground clip. I immediately unplugged the
scope.!!
So my first question, did I cause this malfunction by placing the scope probe
ground clip to ground or was it just an unfortunate coincidence????
My second question, is the following a sensible approach:
1. Take the covers off and do a power-off visual inspection
2. Replace any visually suspect components
3. Then with cover off, power up and check for smoke.
4. Replace any suspect components
5. Then with power on and isolation transformer connected, do voltage checks
I have some electronics background but no experience with troubleshooting switch
mode power supplies. Anyone recommend any books, web sites, youtube videos that
cover troubleshooting / repair of Tek 2465 SMPS???
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Tektronix Equipment in San Diego Area--Practically FREE!!!!
Greetings. There is a lady in the San Diego area who has a *BUNCH* of Tektronix and other equipment she needs to clear out.
Apparently from a hoarder like us.
Please send me an email and I will post the contact information.
She will be there this weekend from noon till 4 pm (last I heard)
No unreasonable offers refused. There are some slide in spectrum analyzers.
She needs to CLEAR ALL THIS EQUIPMENT OUT
Lets help her out
Kenn
|
Re: Have I blown up my scope??
I'd chalk it up to coincidence.
The power supply boards have snubber networks consisting of C1018, R1018, C1016 and R1016 that are across the mains. Those caps are known to blow out and smoke like you describe - some more violently than others. If you remove the covers and then the inner, top cover, the PS boards are visible and those caps are near the rear of the scope. Those would be my first suspects.
Thanks,
Barry - N4BUQ
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----- Original Message ----- From: "ted webb 1942" <ted.webb.1942@...>
To: "tekscopes" <[email protected]>
Sent: Wednesday, February 23, 2022 7:47:09 PM
Subject: [TekScopes] Have I blown up my scope?? I was tinkering with an RF control circuit and couldn't get it to work. So I
dug out my Tek 2465 scope that hasn't been turned on in about ten years to do
some signal tracing. I plugged it into the handiest power outlet which
happened to be my computer surge suppressor power strip. Then I turned the
scope on, all seemed normal, I probed the scope's square wave voltage
calibrator, it looked pretty good, I wanted to optimize the square wave with
the probe adjustment, but didn't have a tuning tool handy. So I'm thinking to
myself, I'll just put the probe ground alligator clip to ground to see if the
square wave cleans up a bit. Around the time I placed the ground clip to the
outer shell of the channel input BNC, I heard loud pops and saw lots of smoke.
I didn't notice any sparking at the ground clip. I immediately unplugged the
scope.!!
So my first question, did I cause this malfunction by placing the scope probe
ground clip to ground or was it just an unfortunate coincidence????
My second question, is the following a sensible approach:
1. Take the covers off and do a power-off visual inspection
2. Replace any visually suspect components
3. Then with cover off, power up and check for smoke.
4. Replace any suspect components
5. Then with power on and isolation transformer connected, do voltage checks
I have some electronics background but no experience with troubleshooting switch
mode power supplies. Anyone recommend any books, web sites, youtube videos that
cover troubleshooting / repair of Tek 2465 SMPS???
|
Have I blown up my scope??
I was tinkering with an RF control circuit and couldn't get it to work. So I dug out my Tek 2465 scope that hasn't been turned on in about ten years to do some signal tracing. I plugged it into the handiest power outlet which happened to be my computer surge suppressor power strip. Then I turned the scope on, all seemed normal, I probed the scope's square wave voltage calibrator, it looked pretty good, I wanted to optimize the square wave with the probe adjustment, but didn't have a tuning tool handy. So I'm thinking to myself, I'll just put the probe ground alligator clip to ground to see if the square wave cleans up a bit. Around the time I placed the ground clip to the outer shell of the channel input BNC, I heard loud pops and saw lots of smoke. I didn't notice any sparking at the ground clip. I immediately unplugged the scope.!!
So my first question, did I cause this malfunction by placing the scope probe ground clip to ground or was it just an unfortunate coincidence????
My second question, is the following a sensible approach:
1. Take the covers off and do a power-off visual inspection
2. Replace any visually suspect components
3. Then with cover off, power up and check for smoke.
4. Replace any suspect components
5. Then with power on and isolation transformer connected, do voltage checks
I have some electronics background but no experience with troubleshooting switch mode power supplies. Anyone recommend any books, web sites, youtube videos that cover troubleshooting / repair of Tek 2465 SMPS???
|
Re: 7104 strange beam shape
Chris,
I agree with Toby! Also there are condensers elsewhere that can cause problems. The two 4,7mfd on the high voltage board are likely bad. I replaced mine with 6,8mfd Nichicon ULD types. The additional capacitance reduces the ripple and gives a stiffer supply. Using this type is advised because these need to be a high frequency type. Other series will also work. If the 130V supply is low, that will cause high voltage problems. The originals in mine had high ESR.
Bad connections could cause your problems. Clean and reseat items in sockets including the coax cables.
Mark
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Re: 7104 strange beam shape
On 2022-02-23 6:31 p.m., cmjones01 wrote: I've just tried to use my 7104 for the first time in a few months.
It's been stored in the attic of my house for that time. When put
away, it was working really well. It still seems to be working well
but the spot on the CRT is no longer a spot but a strange-shaped blob.
The blob is one or two inches in diameter, has sharp edges, and its
shape and size vary with the focus and astig controls. It doesn't come
across well in a still photo (especially as the image is a bit muddled
by the worn areas on the MCP) but I made a very short video of what it
looks like:
I don't have much time to spend on this, so I'll probably end up just
putting it back in the attic for another day. I couldn't resist a
quick look inside but nothing's obviously come adrift.
Has anyone seen these symptoms before and figured out their cause? It
feels to me like some electrode in the CRT isn't at the right
potential.
I've seen weird CRT blobs/double blobs simply due to bad LV caps. I would start at the LVPS, as usual. --Toby Chris
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Re: 7104 strange beam shape
Hi Chris , I had that effect on one of my 7104's some tears ago , if I remember correctly there is a preset focus control - maybe focus range control near the rear right-hand side if you take the cover off . One other thing to check is the beam finder switch as it affects several circuits and could affect the focus if not all sections of it are working .
Brian (UK)
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On Wednesday, 23 February 2022, 23:31:51 GMT, cmjones01 <chris@...> wrote:
I've just tried to use my 7104 for the first time in a few months.
It's been stored in the attic of my house for that time. When put
away, it was working really well. It still seems to be working well
but the spot on the CRT is no longer a spot but a strange-shaped blob.
The blob is one or two inches in diameter, has sharp edges, and its
shape and size vary with the focus and astig controls. It doesn't come
across well in a still photo (especially as the image is a bit muddled
by the worn areas on the MCP) but I made a very short video of what it
looks like:
I don't have much time to spend on this, so I'll probably end up just
putting it back in the attic for another day. I couldn't resist a
quick look inside but nothing's obviously come adrift.
Has anyone seen these symptoms before and figured out their cause? It
feels to me like some electrode in the CRT isn't at the right
potential.
Chris
|
I've just tried to use my 7104 for the first time in a few months.
It's been stored in the attic of my house for that time. When put
away, it was working really well. It still seems to be working well
but the spot on the CRT is no longer a spot but a strange-shaped blob.
The blob is one or two inches in diameter, has sharp edges, and its
shape and size vary with the focus and astig controls. It doesn't come
across well in a still photo (especially as the image is a bit muddled
by the worn areas on the MCP) but I made a very short video of what it
looks like:
I don't have much time to spend on this, so I'll probably end up just
putting it back in the attic for another day. I couldn't resist a
quick look inside but nothing's obviously come adrift.
Has anyone seen these symptoms before and figured out their cause? It
feels to me like some electrode in the CRT isn't at the right
potential.
Chris
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Re: 2445 Power supply Fail >> One screw left over ...
After replacing the mains switch with ?5 German made pcb mount , only 4 pins , but functions ok identical size and operation
scope is back running normally , no other component needed changing ..slight mystery as to what was killing the bridge
one side of the switch was ok, the other intermittent
After taking out the psu board stack and replacing , now left with a single screw , with no obvious place ..
Its 6 point head , app 10 mm long , just under 3 mm dial , with washer , smaller than the short screws with washer
that retain the cover etc ,
its not from the board clip that restrains the small pcb . adjacent to the opposite side of the chassis from the tube .
at the rear end plate .
Any thoughts where small diam screw is used , im guessing one of the black plastic clips ?
Tnx-Graham
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Re: Tek DSA8300 sampling scope discontinued
I was told that support ends by 2025.
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Re: DSA power supply random shutdown - any known problems?
Hello Mark,
thanks for the suggestions.
Have you worked on this supply? I remember having read about this supply not being very service-friendly. To my knowledge there is nothing close to a service manual, but perhaps someone can give directions and/or has hands-on experience?
cheers
Martin
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Kenn Arnett
Brian
Martin