Date   

Re: recapping 465 scopes

 

I agree with Brad. I could not get to sleep knowing one of my scopes had a bad capacitor just sitting there.

Regards

----- Original Message -----
From: "Brad Thompson brad.thompson@... [TekScopes]" <TekScopes@...>
To: <TekScopes@...>
Sent: Thursday, January 28, 2016 1:59 PM
Subject: Re: [TekScopes] recapping 465 scopes




On 1/28/2016 11:09 AM, jerry massengale @jmassen418 [TekScopes]
wrote:

Hi,

I just fired up a 465 scope that was working fine 5 years ago but has
been in an unheated shed for that long. It works fair but i see hints
of ripple problems in the trace and operation. I have reworked 465
caps in the past but am wondering if I can get by with connecting
modern caps to the bottoms of old twist lock cans.
Hello, Jerry--

In an emergency situation, you can probably "get by" using caps
tack-soldered to the Twist-lok cans' tabs. However,
if a can cap short-circuits or becomes extremely leaky, the new caps
won't help protect other circuits nor overcome
effects of high leakage.

You're likely better off removing and replacing the failing caps.

73--

Brad AA1IP


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

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


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

Yahoo Groups Links



Re: recapping 465 scopes

Brad Thompson <brad.thompson@...>
 

On 1/28/2016 11:09 AM, jerry massengale @jmassen418 [TekScopes] wrote:

Hi,

I just fired up a 465 scope that was working fine 5 years ago but has been in an unheated shed for that long. It works fair but i see hints of ripple problems in the trace and operation. I have reworked 465 caps in the past but am wondering if I can get by with connecting modern caps to the bottoms of old twist lock cans.
Hello, Jerry--

In an emergency situation, you can probably "get by" using caps tack-soldered to the Twist-lok cans' tabs. However,
if a can cap short-circuits or becomes extremely leaky, the new caps won't help protect other circuits nor overcome
effects of high leakage.

You're likely better off removing and replacing the failing caps.

73--

Brad AA1IP


Re: Anybody have a nice 465(B) 468 or 475(a) to sell?

Paul Amaranth
 

Another reason items will be listed as "not working, parts only" is to
avoid having to deal with buyers who will send it back if it is not
100% perfect. If it is not as described, sellers have to eat the
shipping costs.

I always buy items listed as parts only. More often than not, I end up
with something that is 90-100% functional. And, if not, then I can
have some fun fixing it, or, in the worst case, I have parts. Unless
you are buying something with a CPU in it, faults tend to be fairly
straightforward. Processor based instruments from the 80s and early
90s are a bit more challenging, but still not too bad. The low
level of integration at that time makes it possible to actually track
down problems.

Back on topic a bit, 468s are kind of fun, but they're a terrible
DSO. The storage function isn't good for much beyond audio
signals and the digital section is tons of fun to troubleshoot.
If you don't really need storage, get a 465 variant; they're much
easier to fix. If you do need storage, either look for a
good analog storage scope or get a more recent DSO.

--
Paul Amaranth, GCIH | Rochester MI, USA
Aurora Group, Inc. | Security, Systems & Software
paul@... | Unix & Windows


Re: Bent vacuum tube pins

Torch Fireman
 

On 28/01/2016 8:04 AM, Ken Chalfant kpchalfant@... [TekScopes] wrote:

I also remember 7 and 9 pin riser sockets. They might have been 1/2 to 1 inch tall and could be secured to your tube tester socket
They are called "socket savers". You can still buy them.


Re: Anybody have a nice 465(B) 468 or 475(a) to sell?

Mike Drum
 

I agree completely with what you have stated. This is also my experience on the E place. For a XMAS gift to myself,

I picked up a 4655B, a 454, and an HP 3312A signal generator this past December.

None of the scopes showed a photo of a trace. The signal generator showed no output to a scope.

Reading the description, looking at feedback, examining what photos I could, and using gut instinct produced 3 perfectly

working and excellent cosmetic condition instruments. Other then some controls needing some contact cleaning, I ended

up with 3 instruments I could relist for a profit if I chose to, but these were not acquired to relist. These are for keeps.

If your purchasing anything used, there is always some risk. The sellers that chose to list items with poor photos, bad descriptions,

and little effort don't necessarily have bad products to sell. If you can use some good judgment in selecting a scope there, you can actually

come away with a great instrument for a very attractive price since most buyers will look elsewhere when the listings don't have all

the proof items they are looking for. I'm not saying those buyers are wrong. I'm only saying that it is possible some great products

can be had for little money if the buyer can manage to weed through the listings and use those experience elements to make a selection.



Honestly, I am willing to take the risk because I have more fun fixing the scopes then I do using them. I also enjoy cleaning them up and

Returning them to like new appearance. It’s time consuming, but very rewarding in my opinion.



Mike





From: TekScopes@... [mailto:TekScopes@...]
Sent: Thursday, January 28, 2016 10:39 AM
To: TekScopes@...
Subject: [TekScopes] Re: Anybody have a nice 465(B) 468 or 475(a) to sell?





I’ll make an offside comment here in relation to your curiousness about the Eb auction site listings and descriptions and really knowing the truth about the condition of an item.

First – and probably most, many of the people who sell these items know nothing about what they are listing. “Powers up” and “no further testing” are real giveaways. But these can also be interpreted as the seller is either too busy, too lazy or simply wants push the item to get their money.

Second, the seller has something to hide about a possible defect in the item. I have found this out on a few instances. You can often do a little detective work by simply sending a question to them about your concern. Sometimes they have simply overlooked an obvious action and are willing to help you with the answer. Other times if they are not knowledgeable about the item, you can give them brief procedural instructions as to how to perform a test, etc. in order to get the information that you require. Some will even go to the extra effort to send you detailed photos beyond those shown in their listing.

Having participated in the past in government and local business auctions that were “spot” auctions (you attend the auction at the location in real-time) I found that there are a considerable number of people who are dazzled by the “no matter what it is, get it cheap and sell it to make money” opportunity. I have seen mommies with their little kids present picking up some very esoteric equipment obviously not knowing what they have but are sure that they will reap millions of dollars if they sell it. Then there are the bottom feeders who will buy and sell anything to make their money.

Several years ago, a colleague of mine purchased a piece of test equipment on Eb. Since he lived only a few miles from the seller, he indicated to them that he would pick it up to save shipping costs. When he arrived to get the unit, it was found damaged and incomplete, contrary to what the seller tried to construe in the listing ("minor cosmetic defects, powers up" etc.). The seller refunded his money on the spot. My friend then engaged in a conversation with the seller about where he obtains his inventory of items to sell. The seller rolled up the garage door exposing a plethora of “well used” equipment and said that he simply goes to garage sales, dumpster dives or drives up and down the alleys picking up items (junk) to sell on Eb. And he makes his living doing it.

I don’t want to give the idea that every seller is that way. With over a thousand purchases under my belt (for my own use) on that famous auction site, I have been burned probably 4 or 5 times. But for many listings, it takes careful reading and reading between the lines these days to understand the psychology of the seller you are buying from. As of late, the oft found phrase of “I don’t know what it is and don’t know how to test it” has been shortened to “I don’t know how to test it” probably because the seller is trying to instill a better feeling of trust in the buyer when they read the description. On the other hand, there are very reputable sellers that deliver what they promise mainly because they want to retain a sterling image and want to do business with you again.


...and I will never figure out why some sellers can’t publish photos beyond those seen that are totally out of focus or are taken in a completely dark room. I suppose I could go on about that one…






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


Re: Bent vacuum tube pins

bonddaleena@...
 

Yeah, but it has that "warm toooby sound".......

ron
N4UE

-----Original Message-----
From: Dwayne Verhey tekscopes@... [TekScopes] <TekScopes@...>
To: TekScopes <TekScopes@...>
Sent: Wed, Jan 27, 2016 9:32 pm
Subject: Re: [TekScopes] Bent vacuum tube pins






He's mighty darn proud of it. 'For $75 I'll stick with the ones built
into my tube tester.

On 27/01/2016 8:58 PM, snapdiode@... [TekScopes] wrote:

I've been playing with tubes for .. decades now, I have never seen or
heard of one of these


NOS GC Electronics 7 & 9 pins tube straightener for 12AX7 6DJ8 EF86
vacuum tubes
http://www.ebay.com/itm/NOS-GC-Electronics-7-9-pins-tube-straightener-for-12AX7-6DJ8-EF86-vacuum-tubes-/181991402482?hash=item2a5f886bf2:g:pVYAAOSwFqJWkGqZ








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


Re: Protected PDF's

Mark Wendt
 

On Thu, 28 Jan 2016, Artek Manuals manuals@... mailto:manuals@... [TekScopes] wrote:
> On 1/28/2016 1:26 AM, Tothwolf tothwolf@... mailto:tothwolf@... [TekScopes] wrote:
>> On Wed, 27 Jan 2016, Artek Manuals manuals@... mailto:manuals@... [TekScopes] wrote:
>>> On 1/27/2016 8:04 PM, Tom Gardner tggzzz@... mailto:tggzzz@... [TekScopes] wrote:
>>>>
>>>> Linux, Firefox, Okular: fail
>>>> Linux, Firefox, Evince: fail
>>>> Linux, Firefox, gv: opens but almost illegible
>>>> Linux, Firefox, epdfview: fail
>>>> Linux, Chrome: OK
>>>
>>> And your point is?
>>
>> Don't assume everyone uses Windows and Adobe Acrobat Reader 9+.
>
> I dont ...I assume that 95% of the user base uses Win-7 and Adobe ...the
> Linux crowd usually figures out a work around anyway ...that is the
> nature of Linux and half the fun

>Don't assume Linux when you see a command prompt.

True. Could even be Unix or VMS. ;-)


Re: Anybody have a nice 465(B) 468 or 475(a) to sell?

 

The 465 & 475 are not storage scopes
 HankC, Boston WA1HOS

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


recapping 465 scopes

 

Hi,


I just fired up a 465 scope that was working fine 5 years ago but has been in an unheated shed for that long. It works fair but i see hints of ripple problems in the trace and operation. I have reworked 465 caps in the past but am wondering if I can get by with connecting modern caps to the bottoms of old twist lock cans.


Jerry Massengale


Re: Protected PDF's

Tothwolf
 

On Thu, 28 Jan 2016, Artek Manuals manuals@... [TekScopes] wrote:
On 1/28/2016 1:26 AM, Tothwolf tothwolf@... [TekScopes] wrote:
On Wed, 27 Jan 2016, Artek Manuals manuals@... [TekScopes] wrote:
On 1/27/2016 8:04 PM, Tom Gardner tggzzz@... [TekScopes] wrote:

Linux, Firefox, Okular: fail
Linux, Firefox, Evince: fail
Linux, Firefox, gv: opens but almost illegible
Linux, Firefox, epdfview: fail
Linux, Chrome: OK
And your point is?
Don't assume everyone uses Windows and Adobe Acrobat Reader 9+.
I dont ...I assume that 95% of the user base uses Win-7 and Adobe ...the Linux crowd usually figures out a work around anyway ...that is the nature of Linux and half the fun
Don't assume Linux when you see a command prompt.


Re: Anybody have a nice 465(B) 468 or 475(a) to sell?

Greg Muir
 

I’ll make an offside comment here in relation to your curiousness about the Eb auction site listings and descriptions and really knowing the truth about the condition of an item.

First – and probably most, many of the people who sell these items know nothing about what they are listing. “Powers up” and “no further testing” are real giveaways. But these can also be interpreted as the seller is either too busy, too lazy or simply wants push the item to get their money.

Second, the seller has something to hide about a possible defect in the item. I have found this out on a few instances. You can often do a little detective work by simply sending a question to them about your concern. Sometimes they have simply overlooked an obvious action and are willing to help you with the answer. Other times if they are not knowledgeable about the item, you can give them brief procedural instructions as to how to perform a test, etc. in order to get the information that you require. Some will even go to the extra effort to send you detailed photos beyond those shown in their listing.

Having participated in the past in government and local business auctions that were “spot” auctions (you attend the auction at the location in real-time) I found that there are a considerable number of people who are dazzled by the “no matter what it is, get it cheap and sell it to make money” opportunity. I have seen mommies with their little kids present picking up some very esoteric equipment obviously not knowing what they have but are sure that they will reap millions of dollars if they sell it. Then there are the bottom feeders who will buy and sell anything to make their money.

Several years ago, a colleague of mine purchased a piece of test equipment on Eb. Since he lived only a few miles from the seller, he indicated to them that he would pick it up to save shipping costs. When he arrived to get the unit, it was found damaged and incomplete, contrary to what the seller tried to construe in the listing ("minor cosmetic defects, powers up" etc.). The seller refunded his money on the spot. My friend then engaged in a conversation with the seller about where he obtains his inventory of items to sell. The seller rolled up the garage door exposing a plethora of “well used” equipment and said that he simply goes to garage sales, dumpster dives or drives up and down the alleys picking up items (junk) to sell on Eb. And he makes his living doing it.

I don’t want to give the idea that every seller is that way. With over a thousand purchases under my belt (for my own use) on that famous auction site, I have been burned probably 4 or 5 times. But for many listings, it takes careful reading and reading between the lines these days to understand the psychology of the seller you are buying from. As of late, the oft found phrase of “I don’t know what it is and don’t know how to test it” has been shortened to “I don’t know how to test it” probably because the seller is trying to instill a better feeling of trust in the buyer when they read the description. On the other hand, there are very reputable sellers that deliver what they promise mainly because they want to retain a sterling image and want to do business with you again.


...and I will never figure out why some sellers can’t publish photos beyond those seen that are totally out of focus or are taken in a completely dark room. I suppose I could go on about that one…


Re: Anybody have a nice 465(B) 468 or 475(a) to sell?

 

On Thu, 28 Jan 2016 09:30:36 +0000, you wrote:

On 28/01/2016 04:49, tranquility@... [TekScopes] wrote:
Tektronix 465, 468 or 475, "A" or "B" variants equally considered to sell? I am looking for a storage scope with at least 100 mHz bandwidth.
Of those only the 468 is storage. Have a look here
http://barrytech.com/tektronix/portables/tekportables.html to sort out
which are and aren't. Homepage>Tektronix for other Tek series.

Gordon
The 464 and 466 are 100 MHz analog storage oscilloscopes but probably
not what he has in mind. Based on writing rate, the 464 has a single
shot storage bandwidth of about 7.5 MHz and in reduced scan mode, the
466 has a single shot storage bandwidth of about 100 MHz.

I used a 464 about 15 years ago and while it worked, I was not
impressed with the clarity of its storage display compared to the 7834
which I have now but others here have reported better performance.

The 468 is a digital storage oscilloscope but without equivalent time
sampling, its maximum sample rate of 25 MSamples/Second only supports
a pretty low storage bandwidth.

The 2230 was the follow on product to the 468 and it *does* support
equivalent time sampling so its digital storage works to 100 MHz on
repetitive signals. It also supports peak detection which I consider
mandatory in a general purpose DSO. The 2232 is an upgrade to the
2230 with a sample rate of 100 MSamples/Second instead of 20
MSamples/second.


Re: Protected PDF's

Tom Gardner
 

On 28/01/16 13:57, Artek Manuals manuals@... [TekScopes] wrote:

On 1/28/2016 7:40 AM, Tom Gardner tggzzz@... [TekScopes] wrote:


So Hakan has, probably unwittingly, chosen vendor-specific
non-standard encodings.

With this knowledge, Hakan can choose what they think is the most
appropriate
course of action.
Unwittingly ????? IMO you owe Hakan an apology. Who defines what is
standard? Who defines how backward compatible software MUST be? Did I
miss the memo where it says you are the person in charge of defining the
global standard? The same software platform works for one user not for
another ( probably release related)
That's rather, um, non-linear - and full of strawman arguments.

Linux, Firefox, Evince: fail
Linux (Ubuntu 14.04 LTS). Firefox v44.0, Evince v3.10.3: Ok.
(Thank you Mark Wendt for putting the software release numbers on your
posting)
Yes. So what. I'm not surprised that different people have different results with non-standards. That's life.

Since each of us have publicised our successes and failures, it give us a better idea of where to look to resolve problems. That's life

IMO ( stress opinion ) you choose ( and we did in our business) the
platform that will reach the MOST users. this is most likely at the
moment WIN-7 and Adobe Reader.
No. Earlier versions without non-standard extensions will, it seems, reach more users.

Whether that is an acceptable tradeoff for Hakan's service is not up to me to decide - nor you.


Re: Bent vacuum tube pins

Dale H. Cook
 

At 08:58 PM 1/27/2016, snapdiode wrote:

I've been playing with tubes for .. decades now, I have never seen or heard of one of these
They have been around for decades, perhaps nearly as long as miniature tubes have been around. I have had one in my shop for around 40 years.

BTW, there is no need to post a long URL to point to an eBay item - the item number alone will do.

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


Re: Protected PDF's

ArtekManuals
 

On 1/28/2016 1:26 AM, Tothwolf tothwolf@... [TekScopes] wrote:
On Wed, 27 Jan 2016, Artek Manuals manuals@... [TekScopes] wrote:
On 1/27/2016 8:04 PM, Tom Gardner tggzzz@... [TekScopes] wrote:
On 27/01/16 23:21, Sigurður �sgeirsson siggi@... [TekScopes] wrote:
I tried this on my iPad, and assumed Chrome uses the same PDF viewer
across platforms. It looks like on iOS it uses the OS-provided PDF
viewer, as iBooks, Safari and Chrome all fail to render the doc I
tested (< http://hakanh.com/dl/docs/kitinstructions/045-0034-00.pdf>
IIRC).

Chrome on Linux has no problem with it, though, so maybe a more
accurate statement is that the iOS PDF viewer is unable to cope?
Linux, Firefox, Okular: fail
Linux, Firefox, Evince: fail
Linux, Firefox, gv: opens but almost illegible
Linux, Firefox, epdfview: fail
Linux, Chrome: OK
And your point is?

Dave
ArtekManuals.com
Don't assume everyone uses Windows and Adobe Acrobat Reader 9+.

I dont ...I assume that 95% of the user base uses Win-7 and Adobe ...the Linux crowd usually figures out a work around anyway ...that is the nature of Linux and half the fun

Dave

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


Re: Protected PDF's

ArtekManuals
 

On 1/28/2016 4:07 AM, Tom Gardner tggzzz@... [TekScopes] wrote:



Cross-platform compatibility is difficult for small organisations to
assess,
because they don't have range of platforms on which to try things.




------------------------------------------------------------------------
Posted by: Tom Gardner <tggzzz@...>
------------------------------------------------------------------------
<https://groups.yahoo.com/neo/groups/TekScopes/conversations/messages/124677;_ylc=X3oDMTJyb2Y1bDdsBF9TAzk3MzU5NzE0BGdycElkAzIxOTEyNDcEZ3Jwc3BJZAMxNzA1MDgzNjYzBG1zZ0lkAzEyNDY3NwRzZWMDZnRyBHNsawNycGx5BHN0aW1lAzE0NTM5NzIwNDY-?act=reply&messageNum=124677>








How VERY TRUE

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


Re: Tek 2215

Tom Jobe <tomjobe@...>
 

Here's a link to a document I posted some years back.
It shows what parts I found that worked in some of these 22xx scopes.
https://groups.yahoo.com/neo/groups/TekScopes/conversations/topics/34071
tom jobe...

On 1/27/2016 10:55 AM, jasontucker70@... [TekScopes] wrote:

Update
I have decoded all the part numbers for the kit below..
050-2242-03 http://hakanh.com/dl/docs/kitinstructions/050-2242-03.pdf
2213, 2213 opt 48, 2213A, 2215,
2215 opt 48, 2215A, 2235, 2236
Q935, Q946, Q947 or Q9070 replacement
Q933, Q935, Q940, Q942 in 2213 and 2215






I am missing one, which is (119-3511-00 Diode/resistor network) and I
can't find any information about it ..
The 151-0852-00 transistor was custom made by On Semiconductors(Will
try to find alternative if possible)...

I will post pdf later with tek part# to actual part for repair and can
someone help with the diode/resistor network and custom transistor
replacement ??


Thanks




Re: Protected PDF's

ArtekManuals
 

On 1/28/2016 7:40 AM, Tom Gardner tggzzz@... [TekScopes] wrote:


So Hakan has, probably unwittingly, chosen vendor-specific
non-standard encodings.

With this knowledge, Hakan can choose what they think is the most
appropriate
course of action.
Unwittingly ????? IMO you owe Hakan an apology. Who defines what is
standard? Who defines how backward compatible software MUST be? Did I
miss the memo where it says you are the person in charge of defining the
global standard? The same software platform works for one user not for
another ( probably release related)

> Linux, Firefox, Evince: fail

Linux (Ubuntu 14.04 LTS). Firefox v44.0, Evince v3.10.3: Ok.
(Thank you Mark Wendt for putting the software release numbers on your
posting)
IMO ( stress opinion ) you choose ( and we did in our business) the
platform that will reach the MOST users. this is most likely at the
moment WIN-7 and Adobe Reader. The Linux crowd will figure out a way to
make it work anyway (all the time grumbling that life is not fair)
which is the very nature of Linux and the its user community anyway.

Manuals on an Iphone ? Not what the industry envisioned I suspect. I can
hardly read a 34 x 11 schematic in the original paper format . The mag
tool works well on my 24" desk top monitor screen. Porting that same
schematic to an iPhone is a lot like driving cross country with a GPS
screen that only shows a mile at a time... makes for quite an adventure
fraught with frustration


CHeers
Flame suit On

Dave

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


Re: serial number abuse

Glenn Little
 

You have to remove the front panel to remove the serial number tag.
It is sandwiched between the thin aluminum front and the structural front.

Glenn

On 1/27/2016 11:56 PM, David @DWH [TekScopes] wrote:
Why would they mutilate the serial number insert instead of just
removing it?

On Wed, 27 Jan 2016 20:41:24 -0800, you wrote:

>Stolen? That is why most people mutilate serial numbers on other items.
>
>Joe Laffey
>
>> On Jan 27, 2016, at 8:19 PM, snapdiode@... [TekScopes]
<TekScopes@...> wrote:
>>
>> Why would anyone have drilled out some digits from a 500-series
plugin serial number plaque?

--
-----------------------------------------------------------------------
Glenn Little ARRL Technical Specialist QCWA LM 28417
Amateur Callsign: WB4UIV wb4uiv@... AMSAT LM 2178
QTH: Goose Creek, SC USA (EM92xx) USSVI LM NRA LM SBE ARRL TAPR
"It is not the class of license that the Amateur holds but the class
of the Amateur that holds the license"
---------------------------------------------------------------------------


Re: Protected PDF's

Mark Wendt
 

On 01/27/2016 08:04 PM, Tom Gardner tggzzz@... [TekScopes] wrote:
On 27/01/16 23:21, Sigurður Ásgeirsson siggi@... [TekScopes] wrote:
I tried this on my iPad, and assumed Chrome uses the same PDF viewer across
platforms. It looks like on iOS it uses the OS-provided PDF viewer, as
iBooks, Safari and Chrome all fail to render the doc I tested (<
http://hakanh.com/dl/docs/kitinstructions/045-0034-00.pdf> IIRC).

Chrome on Linux has no problem with it, though, so maybe a more accurate
statement is that the iOS PDF viewer is unable to cope?
Linux, Firefox, Okular: fail
Linux, Firefox, Evince: fail
Linux, Firefox, gv: opens but almost illegible
Linux, Firefox, epdfview: fail
Linux, Chrome: OK
Linux (Ubuntu 14.04 LTS). Firefox v44.0, Evince v3.10.3: Ok.

Mark