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Re: Tektronix 2230
Dave Hills
Kapton is a high temperature film not really needed in a transformer.
Polyester or mylar film tape is quite adequate for this application. You will often recognize it as yellow or white layer around modern transformer windings. It is also able to stretch, which is useful for keeping windings in place. It has good electrical characteristics, after all, it is used as the dielectric in many capacitors. Of course you would want a non-metalized type. Dave
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Time and frequency items added to the on line stuff day event
I have added some time nuts items to the big annual stuff day (now on-line stuff season thanks to covid-19)
event at Sphere Research. The good part is now people far away get to snorkel though all the goodies. There are some wonderful precision time code systems, using either internal crystal timebases or your own cesium reference to make beautiful 365 day clocks for your desk. One even has 2 linked remote stations (perfect for your own personal mission command console area). Look in in the time/frequency section. Also inexpensive high end hp precision counters (using 10811A's), see the hp section. Plus many other interesting items from white LED arrays to MC1496 mod/demod chips, great for making frequency doublers. See everything here: https://www.sphere.bc.ca/test/stuffday.html Maybe you will find something to take your mind off current events, and don't forget, we add traditional stuff day free stuff to your order. Yes, we take requests for items you don't see. all the best, walter
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Re: Tek 465 Turns on, No Dot, No Trace
On Sat, Jul 11, 2020 at 05:31 AM, Stephen wrote:
The HV Multiplier ground jumper should be located perpendicular to the outer edge of the A9 board, directly in front of the outer nylon nut that secures the HV Multiplier to the top of the A9 board and directly to the rear of P1445. The jumpers on all of my 4xx series scopes have had a plain white porcelain insulator. they could be just a plain wire on some scopes. You can lift this and you should get some sort of dot or trace, as long as the rest of the circuit is working. -- Michael Lynch Dardanelle, AR
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Re: Tek 465 Turns on, No Dot, No Trace
If you determine that your HV multiplier is defective, I have designed a 3D printed enclosure for the 465/475 which allows you to build your own HV multiplier which will fit into the original space. Original HV Multipliers are difficult to find and expensive to purchase. A home brewed version can be built with readily available parts for about $20-30 USD (probably less) and some of your time. I have built and fitted this part to my 465 (High SN) and it fits almost like the original. If interested, I am happy to supply more DETAILS and/or the STL file for the box upon request.
-- Michael Lynch Dardanelle, AR
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Re: Tek 465 Turns on, No Dot, No Trace
Some more info. Also a schematic link for the multiplier.
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https://groups.io/g/TekScopes/topic/tek_465_multiplier/7658373?p=,,,20,0,0,0::recentpostdate%2Fsticky,,,20,2,960,7658373 There is also some x-ray pictures of the multiplier around somewhere.
On 7/11/2020 5:01 PM, Stephen wrote:
On Sat, Jul 11, 2020 at 09:05 AM, Tom Miller wrote:Ok, that sounds like the main problem. That HV multiplier is also usedHmmm... Does it have to be a carbon comp resistor? --
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Re: Tek 465 Turns on, No Dot, No Trace
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On 7/11/2020 5:01 PM, Stephen wrote:
On Sat, Jul 11, 2020 at 09:05 AM, Tom Miller wrote:Ok, that sounds like the main problem. That HV multiplier is also usedHmmm... Does it have to be a carbon comp resistor? --
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Re: My first scope, a Tektronix 11401 with option 2D extended memory and two 11A34 plugins and an 11A33 plugin.
Jim Ford
114XX I have no interest in, but 118XX I do. Having used a CSA803 at work (as well as an HP 54120) several decades ago, I would love to have a 118XX in my garage lab. Tek beats HP with the modularity, and the Tek SD-24 sampling plug-in got "Best in Show", so to speak, from Jim Andrews of Picosecond Pulse Labs (acquired by Tek/Danaher in 2014).My $0.02.Jim Ford Sent from my Verizon, Samsung Galaxy smartphone
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-------- Original message --------From: Precaud <jbau@...> Date: 7/11/20 5:53 AM (GMT-08:00) To: TekScopes@groups.io Subject: Re: [TekScopes] My first scope, a Tektronix 11401 with option 2D extended memory and two 11A34 plugins and an 11A33 plugin. It takes a brave person to admit to liking and using an 11k-series scope :)I have a couple and "like" them in remote-controlled applications, but hands-on operation is a different matter. The digitizer is excellent (if you need 10 bits), I love the large display, and the 11k preamps are superb. I think the entire user interface was designed with remote programming in mind. Even after years of occasional use I can't remember how to do some basic, simple stuff from the front panel. Because of this, it has earned a spot on the floor next to the bench, deployed only when needed.
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Re: FG 504 function generator odd behaviour
Dave Daniel
Ir you end up having to replace any of the TO-3 pass transistors in the chassis, be aware that many (all?) new ones may have a different pinout than the originals.
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Just something to be aware of. DaveD
On Jul 11, 2020, at 17:22, Andy Warner <andyw@...> wrote:
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Re: Tektronix 2230
Hi,
That's why I suggested to look in old equipment as well Sometimes it's inside an old laptop PS you can crack open, or behind the screen of a broken tablet. It's a very small transformer, so only little is needed.
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Re: Tektronix 2230
Jim Ford
Be aware it's not cheap; I remember paying about $30 for a roll. I use it sparingly. It drives me nuts when people at work use it to wrap packages and such!Jim Ford Sent from my Verizon, Samsung Galaxy smartphone
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-------- Original message --------From: Raymond Cote <bluegrassdakine@...> Date: 7/11/20 2:02 AM (GMT-08:00) To: TekScopes@groups.io Subject: Re: [TekScopes] Tektronix 2230 Digikey lists it as available in tape form. YMMV In matters of style, float with the current. In matters of Principle, stand like a rock. “. — Thomas Jefferson —> On Jul 11, 2020, at 02:54, Saroj Pradhan <sarojman.Pradhan@...> wrote:> > > >> On Sat, Jul 11, 2020, 1:04 PM satbeginner <castellcorunas@...> wrote:>> >> Hello Saroj,>> >> Many moons ago in the lab I worked we had a guy who made all the special>> use transformers we needed.>> >> I learned from him to use what he used :-)>> >> In between windings he used a thin layer of Kaptan foil (polyimide, thin>> light brown, slightly transparent) held in place with a simple piece of>> normal electrical tape.>> Then the next winding, insulation layer, next winding, etc.>> >> This kaptan is heat resistant, thin and also provide s good isolation.>> >> Sometimes you find it as a foil used in old electrical devices,and you>> only need a little.>> >> Good luck,>> >> Leo>> >> >> >> > > >
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Tektronix TM500/TM5000 extender version 1.0
Ke-Fong Lin
Hi everyone,
I've a small TM500/TM5000 extender project and it is basically completed. It's been tested working as an extender. It's been also tested working as a standalone debugging device. That is to power a plug-in from lab supplies, which can be useful for repair. Everything is now on github: https://github.com/anotherlin/tek_tm_ext Can you guys have a look and tell me if you can make any sense of it? It's basically the same as version 0.8, without the bodge wire needed: https://groups.io/g/TekScopes/album?id=243643 I'll add some photos for reference on the github tomorrow, otherwise it may be a bit abstract. The standalone AC supplies have not been tested, but I'm pretty confident. It's basically some wiring. The power good (TM5000 PWR pin) circuitry neither because both my SG5010 and AA5001 ignore it But it's also very simple, so it should work. Best regards,
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Re: Tektronix Blue paint
Richard Knoppow
Its better. The example I used in my post does not really have columns. I found that part of the preservation of formatting depends on the choice of font. If you use variable spacing and the reader uses fixed spacing things will not line up. I don't know a real cure for this.
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I suppose someone who mixes custom paints probably understands the formula.
On 7/11/2020 2:06 PM, Reed Dickinson wrote:
I am re-sending the data as the columns did not line up. Years ago a friend, Stan Griffiths, now deceased, passed on to me this Tektronix Blue paint formula. He called it Williamsburg Blue. He said it came from a commercial paint company but I really do not know how to read the formula. Here it is: --
Richard Knoppow dickburk@... WB6KBL
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Re: FG 504 function generator odd behaviour
Andy Warner
On the FG504, the -25V rail is referenced off the +25V one.
Check for bad tantalums on the -25V rail and also independently check the pass transistor used by that rail, it is in the chassis, not the module. I have to work on the sweep section of my FG504, which looks like it will be a right pain. Anyone got any tips for working on the middle board in this unit ? On Sat, Jul 11, 2020 at 13:09 Harvey White <madyn@...> wrote: Generic steps:Andy
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Re: Tektronix Blue paint
Richard Knoppow
The formatting is lost on my machine. perhaps you can send it they way I send photographic formulas. Example below.
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Kodak D-76 Water (at 125F or 52C).................750.0 mL Metol....................................2.0 grams Sodium Sulfite, desiccated.............100.0 grams Hydroquinon..............................5.0 grams Borax, granular..........................2.0 grams Water to make............................1.0 Liter I think this will stay pretty much intact.
On 7/11/2020 1:44 PM, Reed Dickinson wrote:
Years ago a friend, Stan Griffiths, now deceased, passed on to me this Tektronix Blue paint formula. He called it Williamsburg Blue. He said it came from a commercial paint company but I really do not know how to read the formula. Here it is: --
Richard Knoppow dickburk@... WB6KBL
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Re: Tektronix Blue paint
Reed Dickinson
I am re-sending the data as the columns did not line up. Years ago a friend, Stan Griffiths, now deceased, passed on to me this Tektronix Blue paint formula. He called it Williamsburg Blue. He said it came from a commercial paint company but I really do not know how to read the formula. Here it is:
B 4Y22 Black, C 33 Yellow oxide, D 1Y29 Green, W 1Y32 White, E 1Y45 Blue, Base 7-916Y = ounces, 4Y = 4 ounces, 48 Points = 1 ounce Another formula, this one from the late Dean Kidd, is as follows: Base, E480 DBD Interior Satin Lamp Black 37 shots, Thalo Green 22 half shots, Thalo Blue 30 half shots, white 1 ounce 8 shots I would appreciate any feedback on these two formulas for my notes. Reed Dickinson, 1705 Stonehenge Drive, Tustin, CA 92780, reed714@...
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Re: Tek 465 Turns on, No Dot, No Trace
Stephen
On Sat, Jul 11, 2020 at 09:05 AM, Tom Miller wrote:
Hmmm... Does it have to be a carbon comp resistor? I may try to build one using the existing enclosure. I hope it’s not dipped in epoxy. Dinos at Q-Service is out of this part. He’s really a very nice guy. I’ve dealt with him a few time, and talked to him on the phone last week. Maybe I can just replace the parts inside. But I have the feeling it’s not gonna be that easy... Plus, replacing that part apparently requires removing the entire board, which is a project in itself. Grrrr... PS: Were those cracklings sounds i heard to be expected? That startled me. I hope nothing was damaged...
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Tektronix Blue paint
Reed Dickinson
Years ago a friend, Stan Griffiths, now deceased, passed on to me this Tektronix Blue paint formula. He called it Williamsburg Blue. He said it came from a commercial paint company but I really do not know how to read the formula. Here it is:
B 4Y22 BlackC 33 Yellow oxideD 1Y29 GreenW 1Y32 WhiteE 1Y45 Blue Y = ounces4Y = 4 ounces48 Points = 1 ounce Another formula, this one from the late Dean Kidd, is as follows: Base, E480 DBD Interior Satin Shots Half shots Lamp Black 37Thalo Green 22 1Thalo Blue 30 1White 1 Oz 8 I would appreciate any feedback on these two formulas for my notes. Reed Dickinson1705 Stonehenge DriveTustin, CA 92780reed714@...
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Re: Tek 465 Turns on, No Dot, No Trace
Ok, that sounds like the main problem. That HV multiplier is also used in the 475 scope as well as the A and B versions. You might check with Q service in Greece ( excellent to deal with) or search the part number 152-0552-00. Here is one on ebay. https://www.ebay.com/p/1501921351 but a bit expensive.
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Another option is to build one from parts - it's a cockcroff-walton multiplier. Should be some info in the archives on groups.io. It is a tripler so three caps and three diodes plus a 1-3 meg carbon comp resistor and a case to put it in. Pot with wax. Ask on the group if anyone has a spare. Regards
On 7/11/2020 2:24 PM, Stephen wrote:
On Sat, Jul 11, 2020 at 06:24 AM, Tom Miller wrote:There is a wire jumper at board location A-5 that provides the ground toOk, so I did lift that jumper. GOOD MEMORY BTW!!! A-5 it was!! Remind me NOT to ever play Naval BattleS with you! --
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Re: Cleaning TM500 module pushbutton switches
Roy Thistle
On Sat, Jul 11, 2020 at 08:20 AM, J Mcvein wrote:
according to the filings, they are using hydro-treated spent lubricating oil. fish oil is more valuable for making axle grease... a.k.a. as margarine. Ya... don't use margarine to lube your TM500 module push-button switches.
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Re: Cleaning TM500 module pushbutton switches
Roy Thistle
On Fri, Jul 10, 2020 at 06:18 PM, Greg Muir wrote:
The liquid stuff, in the gallon cans, in CONUS, is "different", from the spray, in a way that may explain your observations. Too much chemistry, in one's posts, makes one unpopular... But... "petroleum oils" oxidize, change colour, and become more viscous, in humid, and acidic (Hawaiian ocean air?) environments over sufficient time. The spray imparts only a thin layer of "petroleum oil" ... and most of that drips off, along with the solvent. The little that remains... well...sunlight, heat, dust, and even microbes, they soon diminish that. The oxidation of the thicker layer of "petroleum oil" applied... by using {heavy coatings} of the the liquid stuff, in the gallon cans could... at least partly explain what you observed. Ya... don't use the liquid stuff, in the gallon cans, to dip your TM500 module push-button switches.
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