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Re: Tek 475 repair/restore questions
The group can reply if they disagree, but I would start with the power supply. Make sure all voltages and ripple are within spec. Everything else depends on the power supply working correctly. If you read the archives you will see filter capacitors are a prime suspect for problems in the power supply, although other parts can fail.
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? ?Bob --- On Fri, 10/3/08, deadeye283 <terrym80@...> wrote:
From: deadeye283 <terrym80@...> Subject: [TekScopes] Tek 475 repair/restore questions To: TekScopes@... Date: Friday, October 3, 2008, 5:38 PM Hello to everyone. I'm a new member needing some advice on where to start with a 475 o'scope that doesn't display a trace signal and when I use the beam finder I can locate a stationary dot for both channels. I do have a copy of the service manual for this scope as well as a copy of the troubleshooting guide for these Tektronix scopes. Any pointers or advice would be greatly appreciated. Thanks! [Non-text portions of this message have been removed] |
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Re: 7603 filter caps
ehsjr
Dave_s wrote:
TekScopes@... wrote:Re: 7603 filter capsFWIW I have built theHi, Here's one: Ed |
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Large Batch of new Tek Ceramic Terminal strips + Mod kits
wshawlee2
There have been a few requests here for Tek ceramic solder strips, and
I got one big batch of 7 slot parts (124-0158-00)), brand new in factory bags. There are pics and more data here at the start or the parts index: There's 40 parts, and they are $2.50 each. Let me know if any interest. We also got a large lot of new 050- mod kits from Tek, with instructions and parts for all kinds of units, I will try and post them up as soon as I can. There are new attenuator boards for the 475, 7A19, etc. and many semiconductor upgrade kits. all the best, walter sphere research corp. PS: I will be in Toronto from monday to friday, so if I am slow to answer, that's why. |
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Re: 496P Spectrum Analyzer
Or FleeBay it and get a TR503 in a tm502 or 503 PS.
Mitch N4MF No my TR-503 ain't for sale, being used with the 2794. ______________________________________________ --- In TekScopes@..., "John Miles" <jmiles@...> wrote: patient while the trace points all fill in.tracking generator with the 496P? |
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Tek 475 repair/restore questions
Hello to everyone. I'm a new member needing some advice on where to
start with a 475 o'scope that doesn't display a trace signal and when I use the beam finder I can locate a stationary dot for both channels. I do have a copy of the service manual for this scope as well as a copy of the troubleshooting guide for these Tektronix scopes. Any pointers or advice would be greatly appreciated. Thanks! |
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Re: 496P Spectrum Analyzer
John Miles
About all you can do with a sweep generator is use MAX HOLD, and be patient
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while the trace points all fill in. -- john, KE5FX -----Original Message----- |
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Re: 496P Spectrum Analyzer
Any suggestions for using a Wavetek 2002B sweep generator as a trackingThey are not really compatible, since there's no way to synchronize the Wavetek's sweep to the spectrum analyzer's. The Wavetek is intended to be used with a broadband detector such as an HP 8471 series crystal detector. |
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Re: Water Damaged scopes
lenfischer2000
I think the Tunnel Diodes (typically used in the trigger circuit)
would be worth keeping. They seem to have a finite lifetime and can be difficult to find. Regards, Len --- In TekScopes@..., "Chris Gill" <micro@...> wrote: much in the way of posting.years ago so I am asking advice on what I should salvage from them? obviousparts like the tubes and CRT's plus power transformers I am removing but shouldI keep anything else like delay lines etc., I might add that knobs andfront panels are damaged due to rusted grub screws and the effect of salt wateron the aluminium parts.545A, 545B, 551, 555, 556, 543, 541, 945, 561R, plus more and there a couple ofeach in some cases.575, and a 535 which have sentimental value.much more as I am now strugeling with health issues and on a pension. I have toequipment as well, so storage cost's are now a premium.02-Oct-08 7:46 AM |
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Re: 7603 filter caps
---- Dave_s <group78@...> wrote:
Very sorry, try this |
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Re: 7603 filter caps
Lawrence Glaister
If you have a few spare parts, you can build a capacitor ESR meter
quite easily. Below is a prototype I built. I just added the spice model to the web page in case you want to explore how it operates. cheers -- ===================================================================== Lawrence Glaister VE7IT mailto:ve7it@... 1462 Madrona Drive Nanoose Bay, B.C. Canada V9P 9C9 ===================================================================== |
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Re: 7603 filter caps
Garey Barrell
Dave -
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Try here. <> 73, Garey - K4OAH Glen Allen, VA Drake 2-B, 4-B, C-Line & TR-4/C Service Supplement CDs <www.k4oah.com> Dave_s wrote: TekScopes@... wrote: |
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Re: 7603 filter caps
I've got one of these:-
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very good it is, too. www.peakelec.co.uk/acatalog/jz_esr60.html --- On Fri, 3/10/08, Dave_s <group78@...> wrote:
From: Dave_s <group78@...> Subject: [TekScopes] Re: 7603 filter caps To: TekScopes@... Date: Friday, 3 October, 2008, 3:07 PM TekScopes@yahoogrou ps.com wrote: Re: 7603 filter caps FWIW I have built the oone.com/ links.php < oone.com/ links.php> esr meter and can recommend it but keep in mind that it will show a very low ESR on a shorted cap : ) Hi, I am trying to see that ESR Meter circuit referred to in this mailnote. I'm very interested in building this circuit. Please help me by providing a usable URL. On this site, searching for ESR produces no hits.. Thank you. 73, W6MIK, Dave [Non-text portions of this message have been removed] |
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Re: 7603 filter caps
Dave_s
TekScopes@... wrote:
Re: 7603 filter caps FWIW I have built theHi, I am trying to see that ESR Meter circuit referred to in this mailnote. I'm very interested in building this circuit. Please help me by providing a usable URL. On this site, searching for ESR produces no hits. Thank you. 73, W6MIK, Dave |
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Re: 7603 filter caps
Didier Juges
Or use this software:
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Which now also includes the option of downloading the entire 2500 record (worth 10 divisions in height) and plot it on the screen (I need to upload that version, later today). Didier KO4BB -----Original Message----- |
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Re: 7603 filter caps
Michael J Wallace
I hope this goes thru ok and helps some people ...
TDS Screen Capture via the RS-232 option This screen image was captured from a TDS oscilloscope over the RS-232 port using the Windows Hyperterminal program. To transfer the screen image follow the procedure outlined below. 1. Start Hyperterminal 2. From the TDS Utility IO menu set the port to RS-232. Harware Setup: 9600,1,none,on. Software Setup: Soft Flagging Off. 3. Set the hard copy format. ( This image was produced using PCX ) 4. Set the communications settings in Hyperterminal to match those of the oscilloscope. 9600,8,1,None, Hardware. 5. In the Hyperterminal program, select File Properties click on the settings tab. Click on the ASCII Setup button and un-select Wrap lines that exceed terminal width. This will enable the Hyperterminal program to save binary screen images. 6. Go to Transfer menu, Capture Text, and select a file name and location. 7. Once you have the image you want on the oscilloscope display, press the HARD COPY button. |
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Water Damaged scopes
Hi All,
I hve been a member of this list for some years now but not done much in the way of posting. I am having to part out a large number of scopes damaged about 10 years ago so I am asking advice on what I should salvage from them? obvious parts like the tubes and CRT's plus power transformers I am removing but should I keep anything else like delay lines etc., I might add that knobs and front panels are damaged due to rusted grub screws and the effect of salt water on the aluminium parts. Some of the types are, 316, 317, 506, 561, 564, 565, 524, 549, 545A, 545B, 551, 555, 556, 543, 541, 945, 561R, plus more and there a couple of each in some cases. In addition I will continue to try and refurbish some like a 310A, 575, and a 535 which have sentimental value. I hate to have to do this, but I am running out of time to rebuild much more as I am now strugeling with health issues and on a pension. I have to reduce the pile to a more manageable amount as there is radio equipment as well, so storage cost's are now a premium. Chris Gill VK4YCG. ---------- ---------- No virus found in this outgoing message. Checked by AVG - Version: 8.0.173 / Virus Database: 270.7.5/1703 - Release Date: 02-Oct-08 7:46 AM |
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Re: 7603 filter caps
Jerry Massengale
Greetings,
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? Very good point. For high impedence gear, the ESR most likely is too low to be a factor. ? Jerry --- On Thu, 10/2/08, Craig Sawyers <c.sawyers@...> wrote:
From: Craig Sawyers <c.sawyers@...> Subject: RE: [TekScopes] 7603 filter caps To: "'Tek Scopes'" <TekScopes@...> Date: Thursday, October 2, 2008, 3:03 PM The ESR is critical to ripple.Like all these things, the devil is in the detail. Lets assume that we are talking about a smoothing capacitor conventional 50/60Hz system, and not a switcher. Provided the ESR is significantly less than the total driving impedance (Tx secondary, reflected primary, diode R etc) there is no significant effect. Here are some numbers for a supply with a 220uF capacitor fed by 1N4007 diodes from a 333V secondary with a total series resistance of 31 ohms (typical for valved/tubed applications in classic Tek gear). The current draw is 100mA. ESR ripple p-p 0.1 3.7V 1 3.9V 3 4.8V 10 8.9V So in order to double the p-p ripple you need to have an ESR that is about 30% of the total series resistance feeding it. *For this particular example*. Note that the waveform becomes much more "spikey" at higher ESR, and hence the RMS value is much less effected. Craig |
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Re: Ebay prices, 7D15
This seller has a few expensive items, all of the bid up buy the same
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buyer. Seems suspicious to me. Neil On Thu, Oct 2, 2008 at 3:25 PM, <d.seiter@...> wrote:
I've been watching auctions for 7D15s for a while because I have few I'd |
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