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Re: Dual Sweeps (7B53A, 7B92) work in 7704A? (correctly)
Steve Wiseman
17/03/2004 22:47:49, "Richard W. Solomon"
<w1ksz@...> wrote: Using the 7B92 in a 7704 is akin to stuffing a Ferrari engine in aChevy pickup. Looks and runs nice, but ...Ah, you've met my tastes in automotive design, then :) Also, if eBay throws you 7B92s (or Ferrari engines), there's a tendency to use them for everything. The 7B92 is more appropriate in the 7904.Nope. That's where the 7B92_A_ lives. (actually, it lives in my R7103, but you get the point...) The original question was "does this plugin work in that scope?" - and the answer is a definite yes... As a slight aside, is there any downside to using overspecced plugins? (other than the temptation to wind them to the (uncalibrated) endstops from time to time?) Do they have an inherently shorter life / tendency to oscillate that the scope just ignores / some other fatal flaw? Steve |
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Re: Dual Sweeps (7B53A, 7B92) work in 7704A? (correctly)
Steve Wiseman
17/03/2004 12:16:58, "Craig Sawyers" <c.sawyers@tech-
enterprise.com> wrote: I've just checked out my 7704A using a 7B92A - and it worksjust fine. None of the effects that you describe.Behaves properly with a 7B92(non-A) in my 7704A, here, too. Definftely something screwy going on. (out of interest, what's in the 4th slot, when the 7B92's in the 3rd? (There's a 7D10 in mine, for what it's worth. 'Digital events delay', which I was hoping might be useful for picking a given line out of a PAL frame - but if it's able to do that, I'm too dim to drive it, and have no manual :( Steve |
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Re: Dual Sweeps (7B53A, 7B92) work in 7704A? (correctly)
Craig Sawyers
Using the 7B92 in a 7704 is akin to stuffing a Ferrari engine in a ChevyWhereas it is true that the 7B92A is good to 500ps/div and the 7704A is only specced at 2ns/div, there is absolutely no reason that the combination should not work just fine. I find the 7704A is still pretty darned good to 1ns/div. And yes - I generally use the 7B92A in either my 7904 or 7834, but the question was asked about whether it would work in the 7704A - and the answer is yes it does. Cheers Craig |
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Re: Dual Sweeps (7B53A, 7B92) work in 7704A? (correctly)
Richard W. Solomon
Using the 7B92 in a 7704 is akin to stuffing a Ferrari engine in a Chevy
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pickup. Looks and runs nice, but ... The 7B92 is more appropriate in the 7904. 73, Dick, W1KSZ -----Original Message-----
From: gettingalongwouldbenice [mailto:gettingalongwouldbenice@...] Sent: Wednesday, March 17, 2004 1:35 PM To: TekScopes@... Subject: [TekScopes] Re: Dual Sweeps (7B53A, 7B92) work in 7704A? (correctly) I fixed the 7B53As. The board mounting screws on one of the inner boards were loose. Tightned the screws and both the 7B53As now behave themselves. That didn't help the 7B92. I tweeked the HF compensation for minimum effect. It's still not right, 20nS ramp looks like a stairway, but at least the sweep doesn't run backwards any more. This is gonna be impossible to find by probing around with a scope. The effect is smaller than the ambient ground noise. Extender just makes it much worse. mike --- In TekScopes@..., "Craig Sawyers" <c.sawyers@t...> wrote: NoneI have two 7B53As and one 7B92 sweep plugins.I've just checked out my 7704A using a 7B92A - and it works just fine. of the effects that you describe. Yahoo! Groups Links |
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Re: 7514 storage scope
Peter van Daalen
What is its weight ?
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Peter van Daalen, PE1ECM Amsterdam - The Netherlands. ----- Original Message -----
From: Craig Sawyers To: TekScopes Sent: Wednesday, March 17, 2004 8:25 PM Subject: [TekScopes] 7514 storage scope I've mentioned this on the list before - this particular seller is trying every way he knows to sell a 7514 storage scope. He's now got it on for $50 buy-it-now including four plug-ins. Who's going to save this thing from the dumpster? If I was the seller, and having relisted it three times at ever lower prices with not one single nibble I'd have chucked it by now. Item number is 3804496713. Craig PS although they come up every now and again on eBay, they seem to be quite rare; Tek only made them for one year and then discontinued them. |
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7514 storage scope
Craig Sawyers
I've mentioned this on the list before - this particular seller is trying
every way he knows to sell a 7514 storage scope. He's now got it on for $50 buy-it-now including four plug-ins. Who's going to save this thing from the dumpster? If I was the seller, and having relisted it three times at ever lower prices with not one single nibble I'd have chucked it by now. Item number is 3804496713. Craig PS although they come up every now and again on eBay, they seem to be quite rare; Tek only made them for one year and then discontinued them. |
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Re: Dual Sweeps (7B53A, 7B92) work in 7704A? (correctly)
Craig Sawyers
I fixed the 7B53As. The board mounting screws on one of theI had exactly that problem with my 7B85. One of the spacer pillars was loose - and this particular one was necessary to ensure ground continuity between the boards. Symptom was that the readout on the CRT display was intermittent. Craig |
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Re: Dual Sweeps (7B53A, 7B92) work in 7704A? (correctly)
I fixed the 7B53As. The board mounting screws on one of the
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inner boards were loose. Tightned the screws and both the 7B53As now behave themselves. That didn't help the 7B92. I tweeked the HF compensation for minimum effect. It's still not right, 20nS ramp looks like a stairway, but at least the sweep doesn't run backwards any more. This is gonna be impossible to find by probing around with a scope. The effect is smaller than the ambient ground noise. Extender just makes it much worse. mike --- In TekScopes@..., "Craig Sawyers" <c.sawyers@t...> wrote:
I have two 7B53As and one 7B92 sweep plugins.I've just checked out my 7704A using a 7B92A - and it works just fine. None |
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Re: Dual Sweeps (7B53A, 7B92) work in 7704A? (correctly)
Craig Sawyers
I have two 7B53As and one 7B92 sweep plugins.I've just checked out my 7704A using a 7B92A - and it works just fine. None of the effects that you describe. Craig |
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Dual Sweeps (7B53A, 7B92) work in 7704A? (correctly)
TEK 7704A with dual sweep funky??
I have two 7B53As and one 7B92 sweep plugins. In a 7704A, they all have similar problems. There's no pretrigger leadtime, can't see the leading edge of the waveform. The trace unblanks about 4 nS after the edge. If I crank up the intensity enough to see that 4nS, the rest blooms badly. Twiddling the trigger level control moves moves the edges all around during the first 150 nS or so. The sweep isn't even monotonic in that first 150nS. The sweep actually reverses in 16nS intervals creating a bright spot and severe distortion if you move an edge through the region. Acts like there's some serious ringing on the first part of the sweep ramp. There's nothing in the cal procedure about compensating this region. I haven't tried poking around inside on an extender yet, but I expect the extender effects will mask what I'm looking for at these speeds. I've got three 7704As that all exhibit this problem. A 7B80/7B85 combination in any of the mainframes works flawlessly. I've got 20 nS of pretrigger visibility. No nonlinearity of the sweep. No blanking issues. So, is there a failure mode in the dual sweep plugins that can be corrected? I've got three that behave similarly, but it's hard to believe they could ship 'em this way. Fixes? Mods? Suggestions? Thanks, mike |
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Re: This guy must be kidding!
Nice picture of the box?!?! Did you notice also all of the duplicate so
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called positive entries? "(Shown with optional external display.)" Shown where?? -----Original Message-----
From: xaos [mailto:xaos@...] Sent: Tuesday, March 16, 2004 10:04 AM To: TekScopes@... Subject: [TekScopes] This guy must be kidding! The guy selling this item (TEK TLA612-2P): has to be either the most incompetent seller or the biggest fraud. And he has a feedback profile of 75% on 10 items. You must be kidding! He is also an idiot if expects anyone to bid on this. -George N2FGX Yahoo! Groups Sponsor ADVERTISEMENT ---------------------------------------------------------------------------- -- Yahoo! Groups Links a.. To visit your group on the web, go to: b.. To unsubscribe from this group, send an email to: TekScopes-unsubscribe@... c.. Your use of Yahoo! Groups is subject to the Yahoo! Terms of Service. |
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Tunnel diode information
Craig Sawyers
Hi all
Thanks to H???kan Hintze, I now have a complete list of all the TD's that Tek used with basic specification (Peak Point Current and Capacitance), and a complete list of instruments in which they were used. I'm going to be editing that and adding what additional information I have. Fred de Vries kindly contributed some data sheets that were produced by Germanium Power Devices after they bought GE's tunnel diode business. I'd like to do the same exercise with sampling diodes and bridges too, but I'll complete the TD exercise first, I think ;-) Thanks to everyone else who sent additional and important information too. Craig |
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Re: Wavetek scans found
xaos
The only thing missing from the excellent Model 166,
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Function Generator, is an external frequency reference input. I don't see how I can do this myself from the schematics. -GH Scott Newell wrote:
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Misc Tek Widgits
Hello All,
I have the following odd Tek plug-on adapters, fixtures, and connector boxes if anyone needs them for a minimal price (or can let me know what they fit). Can't seem to figure out what most of them were used on. 011-0081-00, Blue box with BNC(M) and BNC(F) connectors on ends. Has a small glass diode in series with the center pins. Fedlog says used on 9020 equipment. 017-067, 50 ohm CHG. NET, 5 uS, 0.05uF, 874 type connector with a banana ground pin 1-1/8" away from center. 067-0529-00 Calibration Fixture, 1000:1 divider w/switch, BNC(M)clamp fitting and BNC(F) on ends. B52R Terminating Resistor, 1.5 WATTS, 52 Ohm, UHF M & F on each end. Blue and Clear scope cover for 56x/647 series. Small (1" size) cuts near the lower back right corner (near power connector location?). Otherwise good condition. Regards, Jim Reese |
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647
Darrin Conniff
Hello All,
I recently acquired a 647 with 11B2 time base and 10A2 Dual-Trace Amp, Big thank you to Ken B! Yes, Stan is correct that the 11B2 has four tunnel diodes (all I can easily see is 125). Does anyone have any data on this beast? I was considered repairing and selling on eBay, but I have never seen a 'scope built like this one. It will stay with me, unless someone in this group has a real interest in it. I just weighed it. With plug-ins, it weighs exactly 50 pounds. It was obviously built to take a beating. Only thing wrong (so far) is the HV section. Does anyone know if the 647A is similar enough to use its schematics (bama) to guide me on the 647? They look almost identical. Thanks in advance! Darrin |
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Re: 577/D1 curve tracer common faults
zenith5106
--- In TekScopes@..., "Steve Hogan" <stevehogan@s...>
wrote: Hi all,that was "rejected" by a cal lab. Studying the specs, it seems much more versatile than the 71CTN that I was previously interested in. 100 watts available vs 1/2 watt for the 71CTN. Are there common (unfixable) problems that plague the 577/D1 thatwould make it a poor gamble? Problems with the power transformer, CRT, or unavailable hybrids, etc. Is the 577 a decent instrument? I've never owned a curve tracer,and I think it would be useful for matching transistors for audio preamps and amps. ---------- The 577/177 is a quite reliable instrument even though I personally like the 576 better. The only common unfixable problem I can think of is that the 177 Current/div switch quite often became intermittent at certain settings (around 1 mA/div) due to mechanical wear. Could easily be determined by connecting a 1k resistor between C and E and turn up the Collector supply to display a 45 degree straight line and then wiggle the Current/div knob. /Zenith, Sweden |
ROLYNN PRECHTL K7DFW
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