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FS: 310A and 317 scopes
Several years ago I was bitten by the Tekscope bug and eventually
accumulated fourteen different scopes. I finally realized that many of them just sit around looking nice and gathering dust, so would like to sell some. The big 5's just cost too much to ship nowadays so I'm probably stuck with them (I also have a nice 515A I'm not using if anyone's interested). Anyhow the 310A and the 317 are both working (see pics). (I cleaned the storage dust and dirt off them after taking the calibrator trace pics. They aren't rusty). I'll throw in the P6027 (1X probe) that came with the 310A. The 317 is missing the right cabinet panel and I don't have a spare power cord for it. Otherwise complete. Please make reasonable offers ("silent auction") before I put them on that auction place. Shipping on your dime from zip 65775 (US). thanks Charles |
Re: 535A stood on its end
snapdiode
--- In TekScopes@..., Andre Majorel <aym-scinortcele@...>
wrote: The only thing I can think of, and it is a stretch, is that now the Mumetal cone has its open ends the wrong way around. Maybe the CRT isn't shielded the same way it was before. But it's a given that you have to adjust the trace rotation when you move the scope. |
2n2207 for 547 horizontal sweep and 3A1, 3A6 multivibrator
FYI
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Had an issue with a recently acquired 3A6 - trace switching multivibrator was inop. Contact cleaning and reseating the transistors did the trick. The interesting part was that both transistors had been replaced with what appear to be Motorola devices. They are labeled exactly as follows: M151 0188 Haven't tried to source or cross them. Since they work in the 3A6 they might do fine in the 547, also. Would like to be copied on any follow-ups. Bernd Schroder In a message dated 8/28/2008 8:53:03 PM Pacific Daylight Time,
larynx222@... writes: I'm new to this group, and I can't speak as an expert, but I had a 2N2207 go bad in the multivibrator section of a 3A1 plugin from a 565 scope. I also had trouble finding this transistor, so I tried a 2N404a and it has worked just fine for the past 6 months. I don't know if the operating parameters are more demanding in the sweep section of a 547, but it might be worth a try. 2N404a's were a lot easier to find If an easy source for 2N2207's exists I'd like to hear about it also. Hope this helps ----- Original Message ---- From: samuelrankin <_sam.rankin@... (mailto:sam.rankin@...) > To: _TekScopes@yahoogrouTekSco_ (mailto:TekScopes@...) Sent: Thursday, August 28, 2008 5:37:53 PM Subject: [TekScopes] 2n2207 for 547 horizontal sweep. The horizontal sweep on one of my 547 oscilloscopes died yesterday. I've been able to diagnose the root cause as being a faulty 2N2207 PNP transistor. My question to the group is: where can I find some replacement transistors. A quick search yielded American Microsemiconductor. But the minimum $50 order is way overkill. Thanks in advance for your help. Regards, Sam ****New MapQuest Local shows what's happening at your destination. Dining, Movies, Events, News & more. Try it out! () |
Re: 535A stood on its end
Craig Sawyers
Hello all. Are there any known problems with using a 535A inOther than cooling (ie ensuring that the fan intake is not obscured), and ensuring that the fan does not do a good job of vacuum cleaning the floor and depositing it in the scope, I can think of no reason why not. Craig |
Re: TDS540 - replaced caps but beeper stuck on and clock issue?
Hello David,
I'm fairly sure that all the original TDS520/540/620/640/820 series do not have battery backed real-time clocks. The time is kept in non-volatile memory but not updated while powered down. You need to set the time each time you power up. (I know, I have to do this on my TDS820). The TDS500/600/700 A,B,C and D series had battery backed RTCs. Another issue is that the internal batteries in the non-volatile components are eventually going to fail. They are supposed to have a life of around 10+ years, however I think a lot of these are now well over this. Do you know what the date code is on the DS1245Y-120? As for the piezo beeper, I'm not sure, however it is on the front panel PCB which you haven't done yet... Regards, Stephen. --- In TekScopes@..., David Woodhead <david_woodhead@...> wrote: Acquisitions boards in my TDS540 (did not do front panel yet). I also replaced a couple of TL074's that had a bunch of electrolyte underneath them. the I/O cal routine and it calibrated without issue as well. In fact I have checked everything I can think of and it all appears to be working very well except..... correctly. I can set and it runs fine but when I power down and power up again (a few minutes later) it appears that the clock did not continue to run when powered down. It does not default to year ~2002 (build date) - it remembers the time when powered down and picks up where it left off when powered up again! When I press diplay time it tells me that the clock is not updating when powered downand to run the setup utility to set the time. values ok (when powered down). But the clock does not continue to run when powered down and the beeper is stuck on.
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Re: 7904 R7903 general impressions
Bernice Loui
Hello,
Of the two choices, the 7904 would be better for most work. If rack mount is required, then it going to be a R7xxx, with three slots. The 7xxx mainframe choice depends more on what one is planning to work on with the scope. The later 7904A has a number of improvements that are worth considering (improved power supply, nicer packaging, various circuit updates and etc.). I have used 7904's for years and still to this day,they are one of my favorites. They the basic "work horse" 7K mainframe. Two other very interesting 7K main frames would be the 7844 dual beam which is basically two 7904s in one package or the 7104, micro channel plate CRT with 1Ghz bandwidth using the proper plug ins. I currently use a 7104 at work for specialty analog/digital design work and what that MCP offers is very high real time writing speed. Bernice ~~~~~~~~~~~~~~~~~~~~ I'm looking for a new toy and am thinking about a 7904 or R7903. There is a lot of material in the archives but I would still like to get some ideas from the group as if this is a good choice or if there are better choices in the 7XXX family. Thanks for your input, Bert |
Re: Tek 7S12 TDR plugin for trade
Hello again,
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I think I goofed yesterday and replied to the moderator instead of the list. I just wanted to clarify the trade offer. The 7S12 is just the 7S12, no plugins. Also, the knob for turning the distance tape scale is not 100%. It has a flip out handle for turning the knob, but the actual handle is gone. It functions like an ordinary knob though. Also, I have a line on a 7D15 for a decent price. I'm still looking for sampling heads and pulse generator heads. Thanks, Bob --- In TekScopes@..., "redarlington" <rdarlington@...> wrote:
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TDS540 - replaced caps but beeper stuck on and clock issue?
Hi all,
I just finished replacing all the electroytic caps on CPU and Acquisitions boards in my TDS540 (did not do front panel yet). I also replaced a couple of TL074's that had a bunch of electrolyte underneath them. It now powers up and reliably passes the power on self test. I ran the I/O cal routine and it calibrated without issue as well. In fact I have checked everything I can think of and it all appears to be working very well except..... The beeper stays on continually. Also, the clock is not working correctly. I can set and it runs fine but when I power down and power up again (a few minutes later) it appears that the clock did not continue to run when powered down. It does not default to year ~2002 (build date) - it remembers the time when powered down and picks up where it left off when powered up again! When I press diplay time it tells me that the clock is not updating when powered downand to run the setup utility to set the time. The scope is remembering time and appears to be storing calibration values ok (when powered down). But the clock does not continue to run when powered down and the beeper is stuck on. Any ideas? Thanks! David. |
Re: 2465A issue
This is normal. The calibrator changes frequency with the Time/Div
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setting. Mitch N4MF --- In TekScopes@..., "thepinkfloyd67" <timrim@...> wrote:
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Tek 465M Manual , New Posting
Ashley
Hi,
A manual for the Tek 465M has been posted on: , courtesy of Mr Stan Griffith (W7NI) and the manual site owner. This manual includes schematics and is divided into chapters (sections in the original TEK manual). Thank You Kiss-Electronics Ms Ashley Hall Cornelius, Oregon W7DUZ |
2465A issue
I have a 2465A, when I connect a prob to the built in calibrator, the
timebase and volts/div only have slight effect on waveform by switching through the various settings, as I increase the timebase frequency, it just starts to distort the waveform instead of stretching out the wave. The scope responds ok to a signal generator just fine, timebase and volts/div operate as expected. |
Re: TEK 310-316-317-360 CRT Bezel needed
Kurt
For the benefit of the list archive: I checked the bezels
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on my 310A and 360 and found that they are slightly different, but they are mechanically interchangeable. The 360 bezel is a bit more solid and has a boxy look compared to the rounded corners on the 310A bezel. -kurt --- In TekScopes@..., "vollumscope" <perls@...> wrote:
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Re: 7904 R7903 general impressions
Craig Sawyers
I'm looking for a new toy and am thinking about a 7904 or R7903.My 7904 is my general scope of choice. In fact it gets used most (currently housing a 7L5 and tracking gen), with a 475/DM44 as an easily luggable alternative when needed. Unless you need rack mounting, steer clear of the R7903 - it only has three bays as opposed to 4. Craig |
Re: Tek 475 repair/restore questions
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Before tearing into everything, I would start out by putting the scope into X / Y mode, ( make certain that the intensity is turned down), and checking that the spot can be positioned all over the screen. Then use the probe adjust signal to verify that a H & V line can be optained and that the lines and be positioned properly and that the volts/dev switches are OK.. The manual will show you how to setup X / Y operation. I have never owned a 475 but I have had lots of experience with the 465 & 465B and these are well known for sweep problems caused by the tunnel diodes. RTFM on everything connected to both A & B triggering. You may be able to find some combination that will trick the scope into triggering a sweep, I know that I usually could even with bad TDs. LOL Bert |
Re: Tek 496P GPIB Dip Switch Dust Cover Damage
Russell Shaw
weinerhi wrote:
HELP!!If you just need it shiny, you can polish it with Brasso metal polish (it has fine abrasive), or even with car paint cutting compound first. |
Re: Tek 496P GPIB Dip Switch Dust Cover Damage
There are lens polishing kits in automotive stores for headlines lens. If the plastic is compatible, it might work
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? Bob --- On Sat, 10/4/08, weinerhi <harvw@...> wrote:
From: weinerhi <harvw@...> Subject: [TekScopes] Tek 496P GPIB Dip Switch Dust Cover Damage To: TekScopes@... Date: Saturday, October 4, 2008, 4:40 PM HELP!! The sliding plastic dust cover on the rear of the Tek 496P was difficult to slide, so I sprayed some silicone spray to lubricate it. While the spray freed up the cover, I noticed that it had become clouded. Checking the can of silicone spray (CRC Heavy Duty Silicone), I noticed that it contained ACETONE!! It's incredible that a product to be used on "nylon, rubber, metal & non-metal surfaces" (as stated on the front of the can)would contain this harmful chemical. I have used silicone spray for years on just about everything and the silicone spray can in my garage (different brand) contained no acetone. Having learned a painful lesson (ALWAYS READ THE LABEL), I'm glad I didn't spray it on anything on the front panel!! Does anyone know where I can obtain a replacement for this part? I can't find a reference number for it in the Service Manual. Is there a better name for it than "dust cover"? Is it possible (feasible) to polish it off? Thanks Harv W1BMY |
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