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Re: c-clip pliers
Awhile back, I bought a set of circlip pliers made by Vise-Grip which came with several different sized tips. I think I bought them from Home Depot, but I'm not sure.
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Here is a link to the Irwin website that shows them: They come with four tips, three of which have the same diameter pins but at different angles. The fourth tip set has smaller diameter tips. I saw a webpage at Wal-Mart that shows these, and you can probably find them at your local hardware store or building center. They've served me just fine; I don't recall not being able to remove a circlip since I purchased the pliers. DaveD On 3/31/2018 11:42 AM, snapdiode via Groups.Io wrote:
I'm looking for a good tool to remove the c-clip from the retention shaft from letter-series plugins. |
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c-clip pliers
I'm looking for a good tool to remove the c-clip from the retention shaft from letter-series plugins.
For example I can't tell if the needle nose is small enough to get into the tiny c-clip holes. I bought a tool but indeed the pins don't fit into the holes, and in any case, the jaws don't close small enough to even hook into both holes. What do you use? |
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Re: Tektronix Type 575 Transistor Curve Tracer - $75 (Syracuse)
Rolynn,
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I have removed the side panels and cleaned out some of the dust. In regard to the possible location of a couple of added fuses, in front of the fan, I have a couple of selenium rectifier stacks and a thermal cutout, so I am guessing that my unit is considerably older than yours. So did you connect these in series with the silicon rectifiers that are in your unit? I oiled the fan and fired up the unit and it is obvious that my rotary switches need cleaning. What is recommended for these open stacked switches? The trace on the CRT seemed kind of dim, so I may have considerable more work to do. Thanks, Matt -----Original Message-----
From: [email protected] [mailto:[email protected]] On Behalf Of ROLYNN PRECHTL K7DFW Sent: Sunday, March 25, 2018 5:51 PM To: [email protected] Subject: Re: [TekScopes] Tektronix Type 575 Transistor Curve Tracer - $75 (Syracuse) The serial number of the unit I have is 004583, so I am assuming the fuses are not there (I haven't taken off the bottom cover yet). ================================================================ The added fuses are located on top of the main chassis, immediately in front of the fan motor, hanging off two ceramic strips containing the silicon rectifiers of the main PS. You will see them by removing the either the fan assembly or the left side panel. They cannot be seen from the bottom or the right side as the xformer is in the way. Rolynn Tek Bvtn and Sunset 1966-1971 |
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Re: 453 scope fan wiring help needed!
Phil et all
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I found a later change page dealing with the fan wiring ( non trivial change) and have uploaded the change page to the file section. hopefully this matches your unit. The change page is in a FOLDER called "453 Late Model Fan" /g/TekScopes/files/453%20LATE%20MODE;%20FAN -DC manuals@... On 3/30/2018 9:17 PM, Phillip Potter wrote:
Hi all, --
Dave Manuals@... www.ArtekManuals.com |
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Re: 453 scope fan wiring help needed!
The manual that I have is three wires. I¡¯m wondering if one is chassis from the case. Time for an ohm meter and check what the resistances are. Two should have the coil between them. One should be 0 ohms to one of the coil and coil ohms to the other. If the 4th is chassis then it should only go to the can.
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On 31 Mar 2018, at 03:30, lop pol via Groups.Io <the_infinite_penguin@...> wrote: |
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Re: 453 scope fan wiring help needed!
Phillip Potter
Hi Dave,
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Yeah, there's a cap involved, for sure... will have to research is... tomorrow! Thanks, Phil On 3/30/2018 6:37 PM, Artekmedia wrote:
There is a starter capacitor involved |
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Re: 453 scope fan wiring help needed!
Phil
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Lets see if this makes sense There is a starter capacitor involved . 3 wire for the motor and 1 wire for the starter cap I think the other starter cap wire is common to the motor -DC On 3/30/2018 9:17 PM, Phillip Potter wrote:
Hi all, --
Dave Manuals@... www.ArtekManuals.com |
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453 scope fan wiring help needed!
Phillip Potter
Hi all,
The fan on my scope was very noisy, so I pulled the back apart and got the fan apart from the shroud, only to find that the wiring is soldered in with no way to get the fan out to work on it.? So.... I cut the wires. Now, in the process of returning it to the scope, I've been reconnecting the wires, BUT in my clumsy style I managed to pull the shortest of the four (the black one) out of the back while attempting to strip it!? Grrrr. So, now I can't tell where the wire connects to the scope!? I have three different schematics (manuals) and NONE of the three show a fan with FOUR wires!!!? Only three...... What the heck?!? Is there anyone here who can shed some light on what I should do now?? That is... after I shoot myself! Thanks in advance for anything you can suggest. Phil |
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Re: 2215 With Intermittent Bright Trace and Flashing Neon Bulbs
Jeff,
Thanks for the tips. It's easy to see the back of the CRT socket in the 2215; not so easy to see the CRT side of the socket unless I pull the CRT shield off. Perhaps I should also look at the potential across DS 870. It would just be my luck that the neon bulb is out so I'm missing the full story. Thanks for the help. |
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Re: 2215 With Intermittent Bright Trace and Flashing Neon Bulbs
Dave,
The HV meter I used for the -2KV cathode measurement has a 40KV full range, so very possible I didn't see the -2KV move the needle. I'll have to see which type of preregulator it has. I noticed the possibility of either in the service manual. I'll take a look at the DC restorer in a dark room to see if anything is arcing or glowing. Thanks for the tips. |
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Re: Tek 7623A - Lowest HF Step response adjustment issue (Mid Frequency Lacking)
On Thu, Mar 29, 2018 at 01:26 pm, Fabio Trevisan wrote:
Fabio, 151-0271-00 is not a matched pair, so Tek didn't judge that necessary . 20 mV difference is not important at all since these transistors are current driven at the emitter. The transistors in the previous pair Q2405/2505 have (or should have) enough headroom in Vce (maybe check this). This also explains that you see no difference in collector signal. Difference in hfe could do more harm perhaps, though I also doubt this. A suitable replacement would be 2N4261. Sphere has a few new in stock under 151-0434-00, $6 each. In the cross ref also listed as 151-0271-00. Albert |
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Re: An actually rare Tektronix item
The one on ebay could have also been bought at the country store and taken home by anybody from a high school kid to a 7000 series design engineer.
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Bob. On 3/30/2018 11:35 AM, ROLYNN PRECHTL K7DFW wrote:
I was hoping someone could say, "I used one when I was at tek", or "I bought mine at the country store"... |
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Re: Back feet for 335 scope
Phillip Potter
Hi Jeff,
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Just a quick note to let you know that I received the 335 back feet and they are "perfect!" in fit and finish.? The included screws and washers are "icing on the cake" and make it even better! I will be setting up for some photographs in the near future. Thanks, Phil On 3/30/2018 6:59 AM, Jeff Davis wrote:
I uploaded the photos taken from having the feet installed on Bert's 314 to the photo gallery this morning. The album name is "Tektronix 314 and 335 Replacement Feet" |
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Re: An actually rare Tektronix item
I was hoping someone could say, "I used one when I was at tek", or "I bought mine at the country store"...
I guessed from the dimensions and hardware that it was probably a 585, or similar... the 585 would have one of the biggest transformers of the common 500 series. also guessed that it was simply the bottom of the 585, as that is where all the power supply stuff was located. Seems smaller than a 500 series scope, though. ====================================================================== Mine came via the Country Store. Deane Kidd supplied me with the nine page hand drawn schematics and calculations that CAL HUNGEL produced dated 09-10-59, 09-11-59, 09-18-59 and 07-28-60. HUNGEL noted that the transformer would be from a 545 or a 585. My memory is telling me that the main frame is from yet a different 500 series unit. My E-PS is on the bottom of a stack so I'll not be looking for what I feel is there. I remember that there are part numbers or other information to show which scope donated the frame. It measures 11x8x21 HWD so it is definitely not of the 545/585 size. From my memory of ~25 years ago when I purchased it, there seems to be a number 'three' in the donor, like 503 or 530 or? Rolynn Tek Bvtn and Sunset 1966-1971 |
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Re: An actually rare Tektronix item
Chuck Harris
Thanks.
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I was hoping someone could say, "I used one when I was at tek", or "I bought mine at the country store"... I guessed from the dimensions and hardware that it was probably a 585, or similar... the 585 would have one of the biggest transformers of the common 500 series. I also guessed that it was simply the bottom of the 585, as that is where all the power supply stuff was located. Seems smaller than a 500 series scope, though. -Chuck Harris David G. wrote: I actually have the TEK documentation on this unit as I have one on my bench. |
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Re: An actually rare Tektronix item
I actually have the TEK documentation on this unit as I have one on my bench.
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I did share as much as I could on the wiki, but was not able to upload the schematics. I acquired mine through an ex-TEK employee whom brought it home from the company store decades ago. Stan Griffiths and I determined it to roughly be a PSU rack from the Type 585 Oscilloscope. Very nice piece for gear really. Hope it helps. Cheers, David On Mar 30, 2018, at 12:37 PM, Chuck Harris <cfharris@...> wrote: |
ROLYNN PRECHTL K7DFW
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