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Re: First post - Hello and a question
Johnny Chapman
I do repair the audio stuff. My recommendations are
reasonable and explained. I don't know the high falutin stuff like yall others, but this other stuff is my fortay. For going out buying DVD players and such: some are crap. For the set of live players like my Yamaha DVD-S1200, repair is worth it! You DO need a scope for it. I've the service manual for it and a parts model. If you don't have a remote, they are easy to build. To check them first, use your scope and an IR to electrical converter. The 7603 are awesome. However, again, the size of the 5000 series guys is just wonderful. Additionallly, they were designed by Tek just for that purpose! Again, the 5000 series plugins are found usually NOS for pennies on ebay. Later, class coming in and gotta gettem straight. Thanks. ____________________________________________________________________________________ Want to start your own business? Learn how on Yahoo! Small Business. |
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Re: First post - Hello and a question
J Forster
From: "Craig Sawyers"
> NONSENSE: You can easily verify that a 7603 is basically > working using > it's internal calibrator. and a length of wire For most work.... > including the genesis of this thread... you don't need a lab quality > calibration. In fact, a 60 year old AC coupled DuMont would work just > fine. > > -John Did you deliberately miss the smiley and general tongue in cheek nature of Kuba's comment, or did it just go straight over your head? Craig I think a reasonable question from a newbie deserves a straight, fairly simple answer, not a bunch of nit picking. I echo Stefdan's comment. The original question was about a scope for audio and tuner alignment. I repeat, a 7603/7A18/7B53 or 465 will do just fine. Ditto a newish Asian scope, but IMO, the Tek stuff is likely more durable. You can fix it and get all the doc also. Any of those options is likely better than what a service place has. As for fixing CD players, you don't NEED a scope. You likely will not be able to get replacement parts or doc anyway. Toss it out and buy a new one. FWIW, -John |
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Re: First post - Hello and a question
Stefan Trethan
On Tue, 06 Feb 2007 18:23:55 +0100, J Forster <jfor@...> wrote:
NONSENSE: You can easily verify that a 7603 is basically working using I agree. For most work you do not need a fully calibrated scope. ST |
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Re: First post - Hello and a question
Craig Sawyers
NONSENSE: You can easily verify that a 7603 is basicallyDid you deliberately miss the smiley and general tongue in cheek nature of Kuba's comment, or did it just go straight over your head? Craig |
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Re: First post - Hello and a question
J Forster
From: Kuba Ober <ober.14@...>
On Monday 05 February 2007 19:54, you wrote: > I would recommend the 7603 with a 7B53 Time Base and a couple of 7A18 > Vertical Amps. You can get that combo for $125 or less. With the plethora > of other plug-ins available you would have a versatile system that is > easily repairable Assuming you have approxv $1000 worth of other test equipment needed to recalibrate said 7603 :) It's an easily snowballing hobby. Cheers, Kuba NONSENSE: You can easily verify that a 7603 is basically working using it's internal calibrator. and a length of wire For most work.... including the genesis of this thread... you don't need a lab quality calibration. In fact, a 60 year old AC coupled DuMont would work just fine. -John |
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Re: 11K Series question, is there anything other than 11A plug ins?
Steve Wiseman
On Tue, 06 Feb 2007 16:36:23 -0000, wshawlee2 <walter2@...> wrote:
I have never seen one, but I can't help but wonder, does any plug inYes. There's the video trigger plugin (11T5H) and its 75-ohm vertical sidekick the 11A34V, at least. To be honest, though, even as a developer of video gear for my day job, they're a bit of a luxury - there's always another way of getting the measurement made. Convenient, though. sweep is internal to the frame, so I can't see any use for a sweep,Not that I've seen... (although DSA has a tolerable FFT built in, for a sort-of spectrum analyser) HasYeah, they work fine (once you've cut the plastic peg away). You just need to train yourself to reach for the plugin, not the touchscreen, to change things. The DSA602 has noise issues with low amplitude signals, mind. My otherwise much less fun 11401 gets the 7A22 if I need a combination of low level differential and storage. Anyway, I got a few 11K frames and plug ins, and am going to startOnly got experience as a user, but I have to say, my 7K gear doesn't get a lot of use any more. Steve |
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Re: First post - Hello and a question
Richard W. Solomon
I have repaired many a TEK scope, most of the 7603's were the result of
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human destruction not circuit failure. And of those not needing repair, I have found most of them to be within tolerance and NOT needing re-cal. Detroit should make cars as well designed and built as the 7603. 73, Dick, W1KSZ -----Original Message-----
From: Kuba Ober <ober.14@...> |
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Re: old fashioned 535 - first start after 35 years
Michael Petereit
Stan,
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I checked the voltages: +100V = 124V +225V = 203V +350V = 306V +500V = 464V -150V = -144V A lot voltage is below the limits. The main supply is switched to 234V, the current standard voltage is 235V on the power line. I assume the rectifier might be broken. Since the hartley oscillator is powered by the +350V line and coupled with the +340V line according schematics the tube might not run as expected. The frequency must be aroung 50kHz but I do not have a AM receiver to check ans again the dirt inside the scope is expecially around the HV and this oscillator horrible. Any other ideas about the lower voltages ? BR, Michael Stan and Patricia Griffiths said the following on 05.02.2007 22:02:
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Re: First post - Hello and a question
arthurok
he needs something simple
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he is at 0 right now im not sure he could even repair an o scope even a chinese 20 mhz no delay line scope would do for his needs. i think he should buy the newest most reliable scope that he can find for his money thats also easy to repair the 422 is a great audio scope but old ----- Original Message -----
From: Kuba Ober To: TekScopes@... Sent: Tuesday, February 06, 2007 10:25 AM Subject: Re: [TekScopes] First post - Hello and a question On Monday 05 February 2007 19:54, you wrote: > I would recommend the 7603 with a 7B53 Time Base and a couple of 7A18 > Vertical Amps. You can get that combo for $125 or less. With the plethora > of other plug-ins available you would have a versatile system that is > easily repairable Assuming you have approxv $1000 worth of other test equipment needed to recalibrate said 7603 :) It's an easily snowballing hobby. Cheers, Kuba |
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Completely free stuff, tek and others, but you have to pick it up.
wshawlee2
I am doing a big clean up and toss-out over the next month or two, and
a lot of tek bits are going to hit the dustbin (especially 7K ad 5K stuff). I just have to have the space back for other things. Also lots of fluke and HP left overs, etc. I found a big box of switching power supplies for 7K frames, for example. I don't have time or desire to pack and ship it, but for anybody thinking of trip up this way to beautiful BC (Kelowna), let me know, and I will start a pile for you. contact me off list for more details. even with thousands of feet of space, and two storage buildings, we are just out of space, so some stuff has to die. This is the moment. all the best, walter sphere research |
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11K Series question, is there anything other than 11A plug ins?
wshawlee2
I have never seen one, but I can't help but wonder, does any plug in
exist for the 11K series of frames OTHER than a simple vertical 11A-series unit? sweep is internal to the frame, so I can't see any use for a sweep, but curve tracer, logic analyzer of spectrum analyzer, maybe? Has anybody run 7K plug in there with much luck? I have noted some earlier postings with comments that they do function, but with no remote control or readout. Anyway, I got a few 11K frames and plug ins, and am going to start tinkering, so I'm happy to hear from anybody that has experience with these. ALSO, still trying to find 2505 software and 25A series plug-ins, if you can help, please let me know, all the best, walter sphere research |
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Re: First post - Hello and a question
Kuba Ober
The 7000 series was the premium line of its day. They were built forI'd suggest staying away from switcher-based mainframes for a casual user not interested in playing with a disassembled scope that much :) 7603 has a benign linear power supply, big screen, and with two 7A22s and a time base is more than enough for serious audio work (checking CMRR, noise, what have ya). Cheers, Kuba |
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Re: First post - Hello and a question
Kuba Ober
On Monday 05 February 2007 19:54, you wrote:
I would recommend the 7603 with a 7B53 Time Base and a couple of 7A18Assuming you have approxv $1000 worth of other test equipment needed to recalibrate said 7603 :) It's an easily snowballing hobby. Cheers, Kuba |
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CRT differences
I have often wondered about the actual differences in Tektronix CRTs.
Within a basic class the tubes appear to be identical except for the part number. Please cut me lots of slack on the word appear. Just for example take the 465/a/b/m, 2213/3a/15/15a,and many others. Quite some time ago, I got a nice 465B for almost nothing and it had a dead crt. I had almost nothing to lose so I tried a jug from a 465M which had a badly broken case. It has been running fine for about four years now. Any thoughts? |
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Re: Tek 2235 HV Multiplier
georgeplhak
TEK obviously had a second source for these.
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The actual U975 in my 2235 (that may need one) is labeled: "152-0806-00 MSL8513 MURATA 8544" The 8544 is probably the date code. A quick search of MURATA and UNITRODE websites doesn't get any hits on either the TEK pn or the mfr pn. Sphere doesn't seem to have any. George Plhak, Acton, Ontario, Canada --- In TekScopes@..., "georgeplhak" <ffwd@...> wrote:
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Re: Tek 2235 HV Multiplier
georgeplhak
I may need one of these also.
The Tek pn is 152-0806-00 Mfr is Unitrode Corp. Watertown, MA Their pn CMX647 It is described in the TEK circuit description as: "High voltage mutiplier U975 utilizes the 2-kV winding of T948 to generate 12 kV (so it is 6X) to drive the crt anode. It also uses an internal half wave recifier diode to produce -2 kV for the crt cathode." George Plhak, Acton, Ontario, Canada --- In TekScopes@..., "Deane E. Kidd" <dektyr@...> wrote: follows. You want the HV multiplier from the 2235 scope but you don't include the Tek part number. Yes, I can go find the manual and then the schematic and thefile number and then the part number, but you have the part in your hand. All of us that have parts for Tek items use the same part numbers and it sure makes it easier to help. I have about one hundred multipliers and I know that I don't have the 465M multiplier but I don't know the number for the 2235. Deane |
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Re: First post - Hello and a 335 paean
Ashton Brown
While Stephen did not elaborate on "other desirables" -
When covering the field, it is good to point out the surreal nature of the test equipment market in Murica, as it moves from engineering excellence on to the (ever slightly-sleazy.. like Babbitt) milieu of marketers, of mere repackagers of goods created by less lazy minds. Imagine.. Gigahertz 7104s, for a few $hundred. Items our Lab could not afford are now literally: pearls before swine. By the pallet-load. A Rorshach ink blot proof of a declining civilization, I wot. {Oink..} ie you can afford Two scopes, at least! - when a 500 MHz scope can oft be had for ~100ish or a bit more, if it is shown with a trace. Of course: a 7000 series, at very least a 7603, but frequently the higher bandwidths will be just as absurdly priced - a daily eBay crap shoot. I nominate though, for portability - the magic of Tek, executed in the land of Seiko (and of most autos on US roads today) -- the Sony-Tek 335 - weighing a tad over Ten Pounds (4.7 kg.) 35 MHz nom. 1 mV/DIV @ 25 MHz for those audio preamp thingies. All the delayed sweep bells & whistles of a Titanic-sized, utterly unportative 545 ... shrunk to the size of your average 5+ digit lab dvm. Capable of operation on most any AC or DC voltage around. Of course too, one needs a watchmaker's patience for certain (rare) maintenance efforts - the price of miniaturization. Still, it is a marvel - and in its gold plated attenuator area - a work of art. Even if it didn't work. It does, however. And because of this ongoing fire sale of our superfluous engr'g. tools: again, buy Two. (Thus have spare parts for as long as the power grid stays up. Then go solar (or put a paddle on a car alternator and use the creek by your house: 2 amps at 12V is all you need.)) My 1000 ???, Ashton - who has not yet fully assimilated the pewling surrender of a civilization to Suits, to the crass marketing of megatons of mindless trinkets - and to corporate cubicles with hamster wheels provided for the fungible inmates. (Y'see ... I once watched someone at Beaverton assembling a 1A1 preamp, way-back, way before terminal National Dumbth had set in.) |
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Re: Replacement to DS1230AB Lithium backed NVRAM
ST pioneered built-in battery backed up SRAMs with their MK48Z products many
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years ago. The Dallas parts were interesting inside. Seemed to work OK but I'm betting most of the engineers in this group wouldn't have been happy with the sloppy pre-encapsulation construction techniques (through-hole components on a PCB in those days). Eventually a third vendor, Benchmarq (later bought by Texas Instruments), introduced their version of the products. For a long time, ST offered the only Surface Mount version (heat from reflow soldering plus coin cell battery was a bad combination). They came up with their SnapHat product where the the battery (can't remember if any of the control electronics are in it as well) is "snapped" onto the surface mountable main portion of the component after the soldering process is complete, etc. Maxim/Dallas now has their PowerCap version. I assume TI has something similar. A couple of other approaches: Use a Dallas Smartsocket. Has the battery backup and associated electronics in an IC Socket. One adds the low power SRAM of one's choice. Simtek offers non-volatile SRAM products which don't require a battery. During power-up the data in the non-volatile memory is written to SRAM and vice-versa during power down. The rest of the time one is reading/writing to the SRAM so the wear out issue present in the attempted Ramtron solution is not present. Their current product offering is vastly improved over their older product offering. Their original fab, ZMD, eventually produced their own competing products for sale and later sold that portion of their memory business to Simtek. Gave them products with increased densities and SRAM compatible footprints. - Greg _____ From: TekScopes@... [mailto:TekScopes@...] On Behalf Of John Miles Sent: Monday, February 05, 2007 4:00 PM To: TekScopes@... Subject: RE: [TekScopes] Re: Replacement to DS1230AB Lithium backed NVRAM Well, what fun would it be otherwise? Heh... Would be nice if someone could X-ray one of those puppies to determine where the cell actually is. But the equivalent part numbers are even more useful; thanks for posting those. -- john, KE5FX -----Original Message-----[mailto:TekScopes@yahoogrou <mailto:TekScopes%40yahoogroups.com> ps.com]On Behalf Of Victor Silva"John Miles" <jmiles@...> wrote: Is it practical towith an |
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