Date   
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

/Håkan

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

Chris Wilkson
 

@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

Paul Amaranth
 

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

Jim Ford
 

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=yahoo.com@groups.io> Date: 10/29/18 1:00 PM (GMT-08:00) To: TekScopes@groups.io 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?

Update on the late Jon Batters

ROLYNN PRECHTL K7DFW
 

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


<https://www.since1928hull.com/obituaries/Jon-Batters/#!/Obituary>


RP

Re: Advice needed on equipment cart

Dave Seiter
 

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: Renée <@rjdeeter>
To: TekScopes@groups.io
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
Renée

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=
yahoo.com@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!





Re: Advice needed on equipment cart

Renée
 

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.
Renée

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: 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.


<https://www.since1928hull.com/obituaries/Jon-Batters/#!/Obituary>


RP

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: 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: 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: TekScopes@groups.io [mailto:TekScopes@groups.io] 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;

https://groups.io/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 ?

Egge Siert
 

Hi Dennis,

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

Or:

https://groups.io/g/TekScopes/album?id=77086

Greetings,

Egge Siert

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

Brendan
 

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

tekscopegroup@...
 

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:
https://groups.io/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: P6105 Probe

 

Thanks Dennis, and everybody.

I stand corrected, all these years I thought I had the 3 meter one. I never measured it, it just seemed long. I measured it today and yup, about 6 feet.

Everyone with the ideas, I will try them, I get it, no abrasives.

I'll try cleaning it. If it doesn't work, Dennis, I'll email you. Wish I had anothe 10X probe end, I have another 6 meter cable but the compensator is fried due to me putting a 1X probe end on it. Hey, I was much younger then and with that box on the BNC end I figured the attenuator was in there. In fact I remember wondering what kind of insulation could withstand 1200 V P-P. And it did get that, well 1/10th because I frequently used it on the horizontal (line) output collector of TVs and monitors. With the old 422 having that 20V/div scale it was great. So now I know it was only about 100 volts on there, not 1,000.

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

Chuck Harris
 

For what it's worth, the power cycle counter, and on time counter
are meant to be reset after every calibration. They are there to
let the technician know how long it has really been since the last
calibration... as opposed to whatever the customer says..

They don't mean much to a customer. If you see really low numbers,
it simply means the scope saw little use since its last calibration.

-Chuck Harris

tekscopegroup@... wrote:
... 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

425 Mil vertical module needed....seeking

Jack
 

Hi. I'm a new member finding my way. I bought a lot of Tektronix scopes for the services when with Defence during Vietnam era and visited Tektonix at North Ryde (NSW)
to see about repairs to (I think it's a 564) I still have....still not working I guess after having a new very high voltage insulated transformer wound for CRT filament...two actually, the other must be around "somewhere". I developed a healthy fear of Tektronic CRO's owing to the prices Tektronix charged for repairs..

I have a 425 Mil with broken switch.in Vertical section It's unrepairable. Whilst I could sooner or later find a parts CRO, sight unseen on eBay for example, it may also be on the way out. I think the plastic used in Tektronix may be the lowest quality amongst high quality devices , or maybe they just specify 'shall be or a type formula and manufacture which will maintain all utility until the end of time'

I was directed to your group (Hi...there) . To get to the essential point Would some person have a reasonably low mileage vertical module, complete, which I could buy? Please advise me if so....Australia would be best of course but 'anywhere'. Also...to undo some confusion...I've been told 425 and 465 are "intrinsically" the same CRO...obviously without the Mil labelling... . Does that mean parts are interchangeable?

One reason I ask is that I was also told that the 425 being Military contract and Mil Spec was built to be readily pulled down for field repairs. Is that true?...Is that a quality the 465 does not replicate? if so it may mean that ...just as an example...the vertical amp module from a 465 may have some mounting differences from the 425.

On the other hand it may not. Perhaps someone familiar with this type will bring me to a state of awareness even wisdom regarding my CRO. ...oh... other than having one channel down it seems to work ok and 'oh' again...when I originally pulled it down a piece of curved springy metal fell out. Whence it exactly originated I have no idea...'somewhere inside'. .It may be a method of maintaining the case at frame potential, under pressure as one reassembles the CRO...so perhaps it 'jammed' between a plate on the chassis and the bottom cover. It could have come from elsewhere or it might not be from the CRO at all.....That said, Im pretty sure I saw an exploded view one time where this curved metal piece as shown hanging in mid-air underneath the chassis. Have I been able to find that particular exploded view again (that was 3 years ago)...of course not!!

Any passing of knowledge wisdom common sense mindfulness and most of all perhaps a complete vertical amplifier will be very well received.
--
Jack

Re: 425 Mil vertical module needed....seeking

Jack
 

On Tue, Oct 30, 2018 at 02:52 PM, Jack wrote:

Sorry ...the keyboard made an error.....they do that quite often to me and threats and invective directed to it do not improve their performance!!!

My keyboard left the words "DiD NOT" out of the following comment:

it may also be on the way out. I think the plastic used in Tektronix may be
the lowest quality amongst high quality devices , or maybe they just DID NOTspecify
'shall be or a type formula and manufacture which will maintain all utility
until the end of time'

--
Jack

elusive 463?

John Griessen
 

I seem to have found a board from the elusive 463 scope by comparing to tekwiki front panel photos.
Does any other scope have a button marked "lock knobs"?