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Re: My 2465B has arrived + A5 Board leaky caps cleanup

 

Gentleman,

Thank very much to all of you for all the information provided. I managed to get the scope screen back to life by replacing the two 10.0K 0.1% resistors (R2012 and R2013) in the DAC resistor reference voltage chain. Also replaced R2016 1.0K as it was pulled out by mistake but tested good. Both 10K resistors where open, and I had to use 5% 1206 parts I had on hand just to test if I was going to be successful to fix the DAC volatges, altough the resistors I used are nowhere near the required specs but close enough for the scope to boot without any errors. Everything done by hand soldering with a T7 fine tip and a Weller 35W pencil iron dialed down to reduce the tip temperature. I do quite a bit of 1206 and SOT-23 parts installations, so the experience gave me the confidence to proceed here as well. In the end those resistors where practically trying to jump off the board with the iron by just reflowing them with fresh solder on both ends. So all in all they where very easy to remove, and zero damage to any pads. I did not attempt to correct the DAC reference voltages yet, no point doing so until the proper parts arrive. They where at +1.3848v and -1.2688v, not even near on-spec.

Posted a couple of updated pictures on the photo album:
/g/TekScopes/album?id=76874

Checked a bit the scope accuracy and it was not too bad at all, given the ref voltage errors, but I am not sure this would also affect the accuracy of the cursors as well? On the new picture you will see a 500nS/Div sweep speed but cursors set at two divisions read 973nS. Of course I now realize that I should have spread the cursors out further, in which case the error seemed to get numerically much smaller. Also ordered a new DS1225AD-150 and a 3M socket, although at some point eventually would very much like to go the FM16W08 way.

My Mouser parts order went out earlier today to get these two resistors and also other parts involved in the general exposed area to the leaking caps, just to have them handy. Of course I also ordered the replacement for the 4 filter caps. I chose to order SMD Aluminum Organic Polymer Electrolytic Capacitors which look very much like the original ones. Also ordered the two power line safety caps, in case mine are of the "fishy smell" type. I have not yet checked the PS board to see what type I got. Recommended subs where to get Kemet Polyester 0.1uF 300V Safety Capacitors. Will also check ripple on all the main DC power rails at J119. Scope will probably need some help with the filter caps, as traces seem a bit fuzzy at times, although they look very much sharper when the 20MHz limit is enabled.

Just in case last night I also copied the EXER 02 values by taking a video while scrolling through all the values 00-FF, and even took them down the old fashion way on paper and pencil. EXER 05 indicates this scope has only seen 360 hours of On time, and 125 power cycles (those last 25 are probably mine). From the writings and labels on the front cover and one side of the scope it looks like this was a designated field instrument that probably did not go out that much. The insides are pristine, and cosmetically the outside and front panel controls are in very good shape. Maybe the A/B timebase Sec/Div concentric knobs feel a bit wiggly, maybe a nut or something will have to be tightened inside? I am also glad the so very important front panel cover was included, and the always good to have pouch. No probes unfortunately.

Once the parts order arrives, and I get a chance to throw them on the board, will update this thread again.
Any comments/suggestions always appreciated.

Alex
Re: Anyone have a 5.5 to 18PF variable ceramic trimmer they would like to sell

 

On Mon, Oct 29, 2018 at 07:37 PM, Raymond Domp Frank wrote:


On Fri, Oct 26, 2018 at 12:53 AM, Raymond Domp Frank wrote:


Its the trimmer for the A ramp 10us timing :/ am I going to run into issues
trying to use a ceramic trimmer there compared to air?
I just checked. I have several NOS of the exact same trimmer (ceramic
dielectric) as used by Tek. As said, cost would be postage but shipment from
NL.

Raymond
Thanks for looking. I don't think I'm going to be able to get this thing fixed though. I already spent money on new caps and bridge rectifiers and its still suffering the same issues. I'm very close to giving up and don't want to invest anything else unless I get it to a usable state. Jim Williams I am not.
Re: Pre-Production PG 503 ?

 

Hi Dennis,

When you select Photos and type PG503 into the search all PG503 related Photo Albums pop up including mine.

Or:

/g/TekScopes/album?id=77086

Greetings,

Egge Siert
Re: P6105 Probe

 

Hi Jeff,
This isn't what you were asking for exactly but I have a spare mustard color compensation box for the P6105 which I can send you if that will solve your problem. This would be for the 2 meter probe cable that you have.

It sounds like you may be confused by what you have. Tek distinguished the length of these probe cables and their matching compensation boxes by their color. RED was for 3 meters, MUSTARD was for 2 meters, and SILVER was for 1.5 meters. Your picture clearly shows a mustard cable and mustard compensation box so what is in your picture is a 2 meter cable and box.

You can have the mustard compensation box for $15 total (shipping is included anywhere in the US).
Contact me off list if you want it.

Dennis Tillman W7PF

-----Original Message-----
From: [email protected] [mailto:[email protected]] On Behalf Of Jeff
Urban
Sent: Sunday, October 28, 2018 11:34 AM
Subject: [TekScopes] P6105 Probe

Any way to tighten these up where they connect ? The way the thing is made
it looks like a job for a machine shop...well not really.

I like the probe and it is the 3 meter version. It just is erratic when
moved around. Most of the trouble is in the connector shown at;

/g/TekScopes/photo/77096/0?p=Name,,,20,1,0,0

Is there a "right" way ? That was a good, _fairly_ expensive probe, like
$100 back in the 1970s so it is worth taking care of. I don't want to take
to the R D department. research development ? Hell no ! "Real Debauchery".
That's what I want to avoid.

Any suggestions ? I got ideas but i don't want to do anything "permanent".



--
Dennis Tillman W7PF
TekScopes Moderator
Re: Pre-Production PG 503 ?

 

Hi Egge Siert,
Two questions: What is the link to the picture, and where did you find these?
Dennis

-----Original Message-----
Sent: Sunday, October 28, 2018 4:04 AM
Subject: Re: [TekScopes] Pre-Production PG 503 ?

Hi Bob,

I have myself two PG503's. One early production (no SN) and one with a SN.
Both incorporated your patchboard into the Power Supply Board. I uploaded a
picture of it.

Greetings,

Egge Siert



--
Dennis Tillman W7PF
TekScopes Moderator
Re: Anyone have a 5.5 to 18PF variable ceramic trimmer they would like to sell

 

On Fri, Oct 26, 2018 at 12:53 AM, Raymond Domp Frank wrote:


Its the trimmer for the A ramp 10us timing :/ am I going to run into issues
trying to use a ceramic trimmer there compared to air?
I just checked. I have several NOS of the exact same trimmer (ceramic dielectric) as used by Tek. As said, cost would be postage but shipment from NL.

Raymond
Re: Update on the late Jon Batters

tom jobe
 

Thanks Rolynn,
The message archive here on Tekscopes should have many of his fine posts!
He had a great sense of humor and a lot of knowledge about a lot of things to go with it!
tom jobe...

On 10/29/2018 4:17 PM, ROLYNN PRECHTL K7DFW wrote:

Nothing from the law enforcement end but there was some information in his obituary regarding his past electronics adventures.


<!/Obituary>


RP
Re: Advice needed on equipment cart

 

yes the HF thing may be too narrow 16X30 in. unless you do as I did and add plywood top and angle it for easier viewing, my surface is 20X34 in. after top added. the item no. 60390/507 was $38.00 now $29.99 coupon is good till end of the year.
¸é±ð²Ô¨¦±ð

On 2018-10-29 1:00 p.m., Chris Wilkson via Groups.Io wrote:
@Hakan: That's exactly the info I needed. That's not going to cut it.

@Mark: I used to have a half rack....gave it away years ago. Then got this beast. So yes, that's an option I considered. I need to figure out how many -U's I need (vertical size).
It's hard to find racks around here though. Everything is melamine and plastic casters, or 2 post with tiny casters. Or no wheels at all.
Still looking though...

@Renee: I also considered a utility cart option. I haven't found anything the right size yet. They're all too narrow (14-16") or too wide (36"). I'm hoping to avoid building anything, but I might have to. Do you know the item # of the Harbor Freight cart?



.
Re: Advice needed on equipment cart

 

I found the cheapest HF cart (two shelves) to be flimsy, but the second cheapest (three shelves) can handle a lot of weight.? I have my 4x6 bandsaw on the inverted top shelf, and the other two shelves have about 200lbs of tooling on them.
-Dave

From: ¸é±ð²Ô¨¦±ð <k6fsb.1@...>
To: [email protected]
Sent: Monday, October 29, 2018 10:45 AM
Subject: Re: [TekScopes] Advice needed on equipment cart

for some of my equipment I have been using a Harbor Freight metal
rolling cart. Put plywood 30 degree angle on top, bottom shelf for
manuals, pwr supplies etc....currently there is a cart in the coupons
for 29.99.....normally 80.....If you want plastic...well they are more
¸é±ð²Ô¨¦±ð

On 2018-10-29 9:45 a.m., Mark Goldberg wrote:
How about a rolling 19" rack? There are lots of them, new and used,
available in many different sizes and configurations. I've even seen rack
mounted shelves to provide a work surface. I don't have specific ones to
suggest.

Regards,

Mark


On Mon, Oct 29, 2018 at 9:02 AM Chris Wilkson via Groups.Io <cwilkson=
[email protected]> wrote:

I have an HP VNA stack (8505A, 8503A, 8501A) that I want to put on a
cart.? The gear is about 130 lbs without cables, manuals, etc.? It's also
rack width.? It's hard to find carts for this big heavy stuff.

I'm looking at a Tek K217/s on ebay, but I can't find any specs for it.
Does anyone here have a manual?? Or just know what the weight capacity is?
? (top shelf and total weight)? And if it will fit rack sized analyzers?

Any advice on the K217/s or any other cart that would work is much
appreciated!
Update on the late Jon Batters

 

Nothing from the law enforcement end but there was some information in his obituary regarding his past electronics adventures.


<!/Obituary>


RP
Re: Advice needed on equipment cart

 

Speaking of Harbor Freight, I bought some 275 pound (IIRC) rated casters there a few months ago for my workbench.? Maybe there's a way to replace the casters on a rack to beef up the weight handling?? Just a thought.Jim FSent from my Verizon, Samsung Galaxy smartphone

-------- Original message --------From: "Chris Wilkson via Groups.Io" <cwilkson@...> Date: 10/29/18 1:00 PM (GMT-08:00) To: [email protected] Subject: Re: [TekScopes] Advice needed on equipment cart @Hakan:? That's exactly the info I needed.? That's not going to cut it.@Mark:? I used to have a half rack....gave it away years ago.? Then got this beast.? So yes, that's an option I considered.? I need to figure out how many -U's I need (vertical size).It's hard to find racks around here though. Everything is melamine and plastic casters, or 2 post with tiny casters.? Or no wheels at all.Still looking though...@Renee:? I also considered a utility cart option.? I haven't found anything the right size yet.? They're all too narrow (14-16") or too wide (36").?? I'm hoping to avoid building anything, but I might have to.? Do you know the item # of the Harbor Freight cart?
Re: Advice needed on equipment cart

 

I found a hospital crash cart at my local university surplus that I'm going to use
for my LA (16700). It's got 4 inch casters, drawers and could handle 300lbs easy.

Got it for $35.

Paul

On Mon, Oct 29, 2018 at 09:02:33AM -0700, Chris Wilkson via Groups.Io wrote:
I have an HP VNA stack (8505A, 8503A, 8501A) that I want to put on a cart. The gear is about 130 lbs without cables, manuals, etc. It's also rack width. It's hard to find carts for this big heavy stuff.

I'm looking at a Tek K217/s on ebay, but I can't find any specs for it. Does anyone here have a manual? Or just know what the weight capacity is? (top shelf and total weight) And if it will fit rack sized analyzers?

Any advice on the K217/s or any other cart that would work is much appreciated!






!DSPAM:5bd74515320678265213693!
--
Paul Amaranth, GCIH | Manchester MI, USA
Aurora Group, Inc. | Security, Systems & Software
paul@... | Unix & Windows
Re: Advice needed on equipment cart

 

@Hakan: That's exactly the info I needed. That's not going to cut it.

@Mark: I used to have a half rack....gave it away years ago. Then got this beast. So yes, that's an option I considered. I need to figure out how many -U's I need (vertical size).
It's hard to find racks around here though. Everything is melamine and plastic casters, or 2 post with tiny casters. Or no wheels at all.
Still looking though...

@Renee: I also considered a utility cart option. I haven't found anything the right size yet. They're all too narrow (14-16") or too wide (36"). I'm hoping to avoid building anything, but I might have to. Do you know the item # of the Harbor Freight cart?
Re: P6105 Probe

Chuck Harris
 

The "Pink Pearl" eraser was once a part of the kit used
by gold scrappers to gage plating thickness. There is a
direct relationship between rubs with a Pink Pearl eraser
needed to remove the gold plating down to the base metal,
and the thickness of the gold in microinches.

I remember reading this rule when I was a kid, working as
a silver plater.

-Chuck Harris

Phillip Potter wrote:

Being a retired teacher, might I suggest an "old school" pink eraser? They have no
grit.

Phil

On 10/28/2018 9:12 PM, Chuck Harris wrote:
You are going the wrong way. You want an eraser
that has no abrasive. Typing erasers are full of
abrasive.

The white plastic erasers, such as Sanford's Magic
Rub, or Staedtler's Mars-Plastic.

-Chuck Harris

Jeff Urban wrote:
Would a typing eraser work ?

I didn't want to just try anything, who knows it could be silver plated. If a
typing eraser will do the trick I'll find one. Years ago I wouldn't be caught dead
without one. I also cut them with a knife sometimes at an angle so that it has
support, at least going one way. There should be no problem carving it into the
proper shape or this.

Thanks.
Re: Advice needed on equipment cart

 

On Mon, Oct 29, 2018 at 05:02 PM, Chris Wilkson wrote:


I'm looking at a Tek K217/s on ebay, but I can't find any specs for it. Does
anyone here have a manual? Or just know what the weight capacity is?
According to the 1990 catalog it is:
Top tray 100lbs
Base 100lbs
Total 200 lbs

/H?kan
Re: Advice needed on equipment cart

 

for some of my equipment I have been using a Harbor Freight metal rolling cart. Put plywood 30 degree angle on top, bottom shelf for manuals, pwr supplies etc....currently there is a cart in the coupons for 29.99.....normally 80.....If you want plastic...well they are more
¸é±ð²Ô¨¦±ð

On 2018-10-29 9:45 a.m., Mark Goldberg wrote:
How about a rolling 19" rack? There are lots of them, new and used,
available in many different sizes and configurations. I've even seen rack
mounted shelves to provide a work surface. I don't have specific ones to
suggest.

Regards,

Mark


On Mon, Oct 29, 2018 at 9:02 AM Chris Wilkson via Groups.Io <cwilkson=
[email protected]> wrote:

I have an HP VNA stack (8505A, 8503A, 8501A) that I want to put on a
cart. The gear is about 130 lbs without cables, manuals, etc. It's also
rack width. It's hard to find carts for this big heavy stuff.

I'm looking at a Tek K217/s on ebay, but I can't find any specs for it.
Does anyone here have a manual? Or just know what the weight capacity is?
(top shelf and total weight) And if it will fit rack sized analyzers?

Any advice on the K217/s or any other cart that would work is much
appreciated!
Re: P6105 Probe

Phillip Potter
 

Being a retired teacher, might I suggest an "old school" pink eraser?? They have no grit.

Phil

On 10/28/2018 9:12 PM, Chuck Harris wrote:
You are going the wrong way. You want an eraser
that has no abrasive. Typing erasers are full of
abrasive.

The white plastic erasers, such as Sanford's Magic
Rub, or Staedtler's Mars-Plastic.

-Chuck Harris

Jeff Urban wrote:
Would a typing eraser work ?

I didn't want to just try anything, who knows it could be silver plated. If a typing eraser will do the trick I'll find one. Years ago I wouldn't be caught dead without one. I also cut them with a knife sometimes at an angle so that it has support, at least going one way. There should be no problem carving it into the proper shape or this.

Thanks.
Re: Advice needed on equipment cart

 

How about a rolling 19" rack? There are lots of them, new and used,
available in many different sizes and configurations. I've even seen rack
mounted shelves to provide a work surface. I don't have specific ones to
suggest.

Regards,

Mark


On Mon, Oct 29, 2018 at 9:02 AM Chris Wilkson via Groups.Io <cwilkson=
[email protected]> wrote:

I have an HP VNA stack (8505A, 8503A, 8501A) that I want to put on a
cart. The gear is about 130 lbs without cables, manuals, etc. It's also
rack width. It's hard to find carts for this big heavy stuff.

I'm looking at a Tek K217/s on ebay, but I can't find any specs for it.
Does anyone here have a manual? Or just know what the weight capacity is?
(top shelf and total weight) And if it will fit rack sized analyzers?

Any advice on the K217/s or any other cart that would work is much
appreciated!
Advice needed on equipment cart

 

I have an HP VNA stack (8505A, 8503A, 8501A) that I want to put on a cart. The gear is about 130 lbs without cables, manuals, etc. It's also rack width. It's hard to find carts for this big heavy stuff.

I'm looking at a Tek K217/s on ebay, but I can't find any specs for it. Does anyone here have a manual? Or just know what the weight capacity is? (top shelf and total weight) And if it will fit rack sized analyzers?

Any advice on the K217/s or any other cart that would work is much appreciated!
Re: 465B

 

Later ....It actually pulls down quite easily....but be very careful...there are two shirt wires towards the end of the CRT....They go to 2 spigots on the vertical
and under the shielded wound up cable. The spigots bend quite reaadily. I did a very tidy job of lengthening(5 inches) the wires enough that with the spaghetti on
them they would still curl enough to not pull the sockets off the spigots. The extra wire should be soldered into the hollow pieces (sockets)that go over the CRT spigots...

None of this is rip tear and bust....be very careful at the outset when pulling the vertical amp board...there are other connections.

I need a low mileage vertical amp board complete with all switches for my Mil 425....can anyone assist there? and that spring metal .......(?)

If anyone has to pull that board and is a bit anxious, I'll give complete detail.....I was anxious...not now....but a life as a purposeful construction worker and manager of sites
makes one ham handed enough that I have to tell myself "take your time, it doesn't matter if it takes an hour. In fact 15 minutes of careful work should be adequate to remove
the vertical section and...taking time to carefully lengthen those wires...say 30 minutes to put it all back again.

My Regards

-----Original Message-----
From: Jack
Sent: Monday, October 29, 2018 7:42 AM
To: [email protected]
Subject: Re: [TekScopes] 465B

Hi..I also have broken coupler problem....I understand the 'ears' break on the outer shaft. I did what you are thinking about doing...panel etc. and then found there is one screw preventing simple removal of the screen covering the knob-to-shaft joining area.screen (in my case Channel 'A'. A person who strips them for sale advises me, recently, that you take out the entire vertical section...that is both channels... by removing just 3 screws. It's a while since I tried the initial solution and will soon try this one...however obviously the knobs have to come off. I'll try it soon.

When I pulled the CRO considerably down to try to get to the hidden screw a part fell out...a curved piece of metal which I suppose one could call 'springy'. Whence I have no idea but I suspect it connects chassis to cover for earthing...Any one who knows please advise...Anyone with one to spare please let me know...I have no idea where I safely put it 3 years ago!!


Jack





--
Jack
56681 - 56700 of 208675