Date   

Re: Updated album Mystery 330MHz signal on top of a 3mA pulse from a P6302 - AM503B Combination #photo-notice

Ed (SCSKITS)
 

Dennis:

Have you tried this with a pulse that has a slower rising edge, such as the square wave or pulse out of a function generator?

Does it do the same thing with a falling edge pulse, no 150MHz before followed by 150MHz during and after.

How long does the 150MHz ringing last?

ed


Re: Added lots of Hp/Tek spares plus a new category, AC Power to stuff season + Tek blue paint details

kim.herron@sbcglobal.net
 

I have some of that paint and it came from Stan Griffiths.
The paint color is Williamsburg Blue. Stan had that
matched to Tek scopes. I'm not sure if the Williamsburg
Blue is a stock Sherwin Williams color. It could be as I'm
sure that Tek probably got the paint from S/W. I had
them match me the three colors for Collins S-Line paint
That was at a local store here in Grand Rapids MI. They
probably don't have the formula any more as they don't
keep custom formulas for a LONG time. If Stan had that
custom matched, S/W had a policy of not releasing the
formula for the mix to anyone but the customer that
had it made up. Maybe that's changed too. But who
knows. The store where he had it made up would be the
best bet on the formula.



On 24 May 2021 at 14:14, walter shawlee wrote:

We have been busy adding lots of support parts, and lowering the
cost of ones tha thave been sitting a while, . Alos, I had many
requests for more variable AC power supplies and Variacs like the
custom HP unit we had up last month, so we have added a new
category:

https://www.sphere.bc.ca/test/stuffday.html#acpower

I will keep adding items to it as I find them. Let me know if any
more specific requests,

On the Tek blue paint issue, the stuff I use, which is a perfect
match for color and luster is marked as follows:
OMNI-PAK
Master Blend
EZ-Touch

the specific blend label says:
OPEX L61 Lacquer
L61XXL42-4383
Tek Blue
05/05/2011 (when I got mine)
Portland Commercial #4383
to reorder (503) 249-0222

I think several of us got paint at the same time some years ago,
this is all the data to get more, assuming they are still in
business.
it is excellent paint, the match is incredible.
shipping, however, is a total nightmare.

all the best,
walter (walter2 -at- sphere.bc.ca)
sphere research corp.
https://www.sphere.bc.ca/test/index.html




Kim Herron W8ZV
kim.herron@...
1-616-677-3706



--
Kim Herron
W8ZV
kim dot herron at sbcglobal dot net


Re: Getting calibration equipment calibrated

 

I agree, a fluke 515A is an excellent calibrator (if working and calibrated) for any home lab, maybe ditch the batteries, they are nothing but trouble. They show up regularly, but again, the issue is how do you know it's still good, especially if you buy it used? Being defective is the usual reason they get sold. Others have mentioned some very good DC references that can be used to cross-check it that are not expensive, so you can get to the goal line if you are careful. Also, make friends with somebody close by that has a better bit of gear than you do so you can do a quick check or cal if needed. Outside validation is essential.

I use a regularly cal'd Fluke 5100B to do my DMMs and similar items (I had several 515As, but got rid of them for this), plus I cross-check to a cal'd hp 34401A (I just can't afford a 3458A, but it is the magic weapon if you can afford to cal it!). I also built a super stable 10.0000VDC reference I use as a secondary cross-check, along with a selected super stable 10k resistor.

all the best,
walter (walter2 -at- sphere.bc.ca)
sphere research corp.


Re: Added lots of Hp/Tek spares plus a new category, AC Power to stuff season + Tek blue paint details

 

The phone number, according to a thread on EEVblog, goes to Sherwin Williams, who are still in business. I'm going to go to a Sherwin Williams store to see if they can get some shipped to the store for pickup, which would, I expect, avoid the vicissitudes of consumer level shipment.


Re: 7934 option 02 and IKEA

Mark Vincent
 

It is always great to hear when someone gets something working again.

Mark


Re: Matching Tek Blue Paint

 

I'm going to go by a Sherwin Williams store and see what they can offer me to match the 308 front cover (the most portable sample of Tek Blue that I have to hand).

What I'd really like is to be able to mix my own in an appropriate lacquer base, and then apply it with an airbrush, but if I can find something off-the-shelf that works (as the samples from Behr and Glidden appear to) I'll be satisfied with that.

I need to do more research on what kinds of paints (as in binder chemistry) are available, and what would be closest to / most appropriate to replace the original Tek paint.

-- Jeff Dutky


Re: Matching Tek Blue Paint

Bert Haskins
 

On 5/24/2021 3:48 PM, Tom Lee wrote:
Hi Jeff,

I also assume that it is a batch date. I just looked at the two cans I have, and there's no such information on those particular samples.

-- Cheers,
Tom
I used this ( Krylon® ColorMaster™ Paint + Primer, Gloss, Bahama Sea, 340g ) on a case for a 2235 and it turned out pretty good.

Not a exact match thou.


Added lots of Hp/Tek spares plus a new category, AC Power to stuff season + Tek blue paint details

 

We have been busy adding lots of support parts, and lowering the cost of ones tha thave been sitting a while, . Alos, I had many requests for more variable AC power supplies and Variacs like the custom HP unit we had up last month, so we have added a new category:

https://www.sphere.bc.ca/test/stuffday.html#acpower

I will keep adding items to it as I find them. Let me know if any more specific requests,

On the Tek blue paint issue, the stuff I use, which is a perfect match for color and luster is marked as follows:
OMNI-PAK
Master Blend
EZ-Touch

the specific blend label says:
OPEX L61 Lacquer
L61XXL42-4383
Tek Blue
05/05/2011 (when I got mine)
Portland Commercial #4383
to reorder (503) 249-0222

I think several of us got paint at the same time some years ago,
this is all the data to get more, assuming they are still in business.
it is excellent paint, the match is incredible.
shipping, however, is a total nightmare.

all the best,
walter (walter2 -at- sphere.bc.ca)
sphere research corp.
https://www.sphere.bc.ca/test/index.html


Re: Matching Tek Blue Paint

Ed Breya
 

I'd be wary of any aerosol spray cans that are very old. The propellant tends to leak out over the years. The way to test it is to spray some out, but then once that's done, it's likely to leak faster, or get plugged up from residual paint. I've had cans that were just fine after twenty years or more, even though some had been used, and also some that were virtually "brand new" and never used, but were duds after only a few years. You never know. I think the best approach is to just find out when you have a project to use it on, but don't be too surprised if it doesn't work so well.

Ed


Re: 7934 option 02 and IKEA

Dave Daniel
 

YEAH! Excellent work, Karin. I am totally psyched that your 7934 is once again amongst the living.

DaveD

On May 24, 2021, at 15:05, Karin Johnson <karinann@...> wrote:

Does anyone know what "option 02" is for a 7934????
On the IKEA note, I needed a roll around cart for my newly assembled 7934 and I stopped at the local IKEA store. It turns out one of the ALEX drawer units that comes in a blue/gray color is almost a perfect match for the Tektronix blue. Plus the top is about one inch larger than the 7934 footprint. At perfect little cart and it even has drawers for storing all sorts of stuff.

On the brightest of brightest notes, I did manage to get the disassembled 7934 that I was complaining about back together and it works like a charm.
Plus I also managed to get a new old stock HV transformer installed in my other 7934, that works too.

Best regards,
Karin





Re: Matching Tek Blue Paint

Tom Lee
 

Hi Jeff,

I also assume that it is a batch date. I just looked at the two cans I have, and there's no such information on those particular samples.

-- Cheers,
Tom

--
Prof. Thomas H. Lee
Allen Ctr., Rm. 205
350 Jane Stanford Way
Stanford University
Stanford, CA 94305-4070
http://www-smirc.stanford.edu

On 5/24/2021 12:33, Jeff Dutky wrote:
24 cans!?! I drive a Mini Cooper, I could paint a couple of them!

If shipping this stuff weren't a pain in the ass I would say that we should do a group buy.

Any idea what the 05/05/2011 means? I've found an image of one of these cans of paint that has 5/14/04 marked on it (the other information matches what you provided). I assumed that that was a batch date, but it's ambiguous.

-- Jeff Dutky




Re: My eye sensitivity to blue-violet higher than normal

 

On Mon, May 24, 2021 at 5:15 AM Mark Vincent <orangeglowaudio@...> wrote:
I have known of my ability to see the higher frequency colours since I was a kid. I do not have any vision problems. All I know is the better ability to see blue to violet better than anyone I have met.
How do you know you see those colors better?


Re: Tektronix 2246A faint readout

 

I'm just guessing, but since both trace and readout intensity is affected, doesn't that implicate the HV supply?

If there were a single failed component I would expect that only one or the other intensity would be affected, but with both being dim it makes me think that it's likely to be a single failure upstream of either signal.

Also, this sounds vaguely similar to a problem I had with the grid bias on a 475A a couple months ago. It turned out to be something wrong with a thick film precision resistor (never figured out the exact cause, but replacing the resistor fixed the issue) that formed the voltage divider in the HV regulation circuit.

-- Jeff Dutky


Re: Matching Tek Blue Paint

 

24 cans!?! I drive a Mini Cooper, I could paint a couple of them!

If shipping this stuff weren't a pain in the ass I would say that we should do a group buy.

Any idea what the 05/05/2011 means? I've found an image of one of these cans of paint that has 5/14/04 marked on it (the other information matches what you provided). I assumed that that was a batch date, but it's ambiguous.

-- Jeff Dutky


Re: 7934 option 02 and IKEA

 

Congratulations! I'm glad you got the 7934 working again. A non-working scope that doesn't want to nicely play doctor is quite frustrating (e.g. my 7623A is still on the shit list).

Those are beautiful sets of drawers. I will need to get a few for my bench (you can never have too many multimeters, power supplies, scopes, or storage solutions). The gray-turquoise does look like a close match to Tek blue (which I've been studying for the past few days). It's also just a generally nice color. Nice find.

-- Jeff Dutky


Re: Matching Tek Blue Paint

Tom Lee
 

Hi Jeff,

Just to add to your collection of data, a post by John Williams last year gives the information found on the cans of Tek paint sold by the late Stan Griffiths:

Opex L61 Lacquer
L61XXXL42-4383
Tek Blue
05/05/2011
Portland Commercial #4383
To reorder (503) 249-0222

I have not tried contacting them to see if they still supply the stuff, but another TekScopes post said that the minimum order was 24 cans. That would allow you to paint your car Tek blue!

-- Cheers,
Tom

--
Prof. Thomas H. Lee
Allen Ctr., Rm. 205
350 Jane Stanford Way
Stanford University
Stanford, CA 94305-4070
http://www-smirc.stanford.edu

On 5/24/2021 11:29, Jeff Dutky wrote:
Over the weekend, as part of my effort to restore my recently acquired 533A and scope-moble cart, I did some research on matching Tek Blue paint: first by searching Google and the TekScopes archives (which came up with some contradictory results), then by poking around in the Pantone color app on my phone, getting a list of candidate Pantone colors, averaging the sRGB and Hex values, and feeding those back into the Pantone web site for matching Pantone colors, and finally by taking the protective cover from a Sony/Tek 308 down to Home Depot and select paint sample chips that seemed to be a close match.

I have put pictures off what I found in the album entitled Tek Blue Paint Matching https://groups.io/g/TekScopes/album?id=264429

The averages I came up with are as follows:

L*a*b: 36-9-9
sRGB: 57-91-98
Hex: 3A5B62
Pantone code: 19-4711

and the colors that the Pantone web site returned as matches for the sRGB and Hex averages were:

7545 C
5477 C
4188 C
4167 C
2215 C

(I have no idea what either kind of Pantone color code means, how to decode them, nor whether they are somehow related)

Before I used the Sony/Tek 308 front cover as my reference I compared it against the painted cases of the following instruments: 7603, 475, 2465, 2252, TM506, 533A, and a 500/53A scope-mobile cart. It was a close match to all of them. The vinyl accessory pouches of the Sony/Tek 308 and the 2465 were a little lighter, but I'm not trying to match the color of the vinyl pouches, and the pouches don't match the painted aluminum anyway, so I'm not going to sweat that detail (just as I didn't try to match the color of the various printed manual covers, which vary considerably with age).

My search of the TekScopes archive turned up two messages with apparently useful (if contradictory) information: #18587 from 2006, and #76397 from 2012:

nj902
2006-03-13   #18587

I have used the paint that Tek supplies to refurbish several items
including TM500 frames. Tek charges more than a garden variety can of
spray paint costs, but it is a high quality product that produces a
nice finish.

I just checked with them and it is still available. Here is their reply:

The part number 252-0092-02 (16 OZ AROSOL CAN, OPEX CUSTOM PRODUCTION
LACQUER BLUE L99XXL42, MSDS01621300, SHERWIN-WILLIAMS) is $20.00 MSRP
each and is currently in stock. If not in stock at the time that you
order, it will have a 5 week lead time.

The part number 252-0217-03 (PAINT; SHWEWIN-WILLIAMS,OEPX L61
PRODUCTION LACQUER,L61XX NON-LEAD CUSTOM COLOR L99XXA85,16 OZ
AEROSOL,TEX TV GRAY)is $14.00 MSRP each and is currently in stock. If
not in stock at the time that you order, it will have a 3 week lead time.

To place an order, please call 1-800-833-9200, option 1 for Sales. You
will need to speak with them as this is considered hazardous material
and needs special shipping arangements.

All pricing and availability is subject to change without notice.

EFFECTIVE MAY 30, 2005, TEKTRONIX WILL HAVE A $30.00 MINIMUM ORDER REQUIREMENT
and,

Reed Dickinson
2012-05-30   #76397

I had a local paint store prepare a gallon of paint that matched the Tektronix blue color so closely that one could not > tell the difference between the new and old.  I do not completely understand the nomenclature but here is the formula:

Black                 B     4Y22
Yellow oxide      C    33
Green                D    1Y29
White                W    1Y32
Blue                  E      1Y45
Base                          7-916

The dealer indicated that Y=ounces so 4Y=4 ounces.  Also, 48 points=1 ounce

If anyone can shed more light on this formula I would like to know about it.

Reed Dickinson
My google search turned up a thread on EEVblog (https://www.eevblog.com/forum/repair/tektronix-cabinet-paint/) that had two images (also in the album noted above) showing a Tek Blue lacquer (L61 OPEX LACQUER, L61XXL42, TEK BLUE) with reorder code and phone number (PORTLAND COMMERCIAL #4383, (503) 248-0222, allegedly to Sherwin Williams), and a modern Krylon color that is allegedly a good match (Krylon COLORMAXX paint+primer Gloss Bahama Sea).

-- Jeff Dutky




Re: 7934 option 02 and IKEA

Karin Johnson
 

Thanks Dave.

Karin


Re: 7934 option 02 and IKEA

Dave Peterson
 

Congrats Karin! And you were about to give those away!

It's not a good hobby unless it really pisses you off sometimes. Just means its challenging you.

On Monday, May 24, 2021, 12:04:46 PM PDT, Karin Johnson <karinann@...> wrote:

Does anyone know what "option 02" is for a 7934????
On the IKEA note, I needed a roll around cart for my newly assembled 7934 and I stopped at the local IKEA store.  It turns out one of the ALEX drawer units that comes in a blue/gray color is almost a perfect match for the Tektronix blue.  Plus the top is about one inch larger than the 7934 footprint.  At perfect little cart and it even has drawers for storing all sorts of stuff.

On the brightest of brightest notes, I did manage to get the disassembled 7934 that I was complaining about back together and it works like a charm.
Plus I also managed to get a new old stock HV transformer installed in my other 7934, that works too. 

Best regards,
Karin


7934 option 02 and IKEA

Karin Johnson
 

Does anyone know what "option 02" is for a 7934????
On the IKEA note, I needed a roll around cart for my newly assembled 7934 and I stopped at the local IKEA store. It turns out one of the ALEX drawer units that comes in a blue/gray color is almost a perfect match for the Tektronix blue. Plus the top is about one inch larger than the 7934 footprint. At perfect little cart and it even has drawers for storing all sorts of stuff.

On the brightest of brightest notes, I did manage to get the disassembled 7934 that I was complaining about back together and it works like a charm.
Plus I also managed to get a new old stock HV transformer installed in my other 7934, that works too.

Best regards,
Karin


Re: Getting calibration equipment calibrated

Dave Daniel
 

Where does one get a Fluke 515A calibrated, and at what cost?

DaveD

On May 24, 2021, at 14:19, Ken Eckert <eckertkp@...> wrote:

A really handy bench reference is the Fluke 515A, does DC, AC, and Ohms. No
current though.

On Monday, May 24, 2021, Jeff Dutky <jeff.dutky@...> wrote:

Crab Apples can actually make some damn good apple pie. As with cherry
pie, you really want something very sour for the filling: gives it better
flavor.

-- Jeff Dutky (who grew up on 2 acres with 5 apple trees, 3 sour cherry
trees, and all the pie you could eat)








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