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 Post subject: Oscilloscope info
PostPosted: Mar Mon 17, 2003 7:11 am 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 2
Location: Milwaukee, WI
I am new the radio and TV repair. What would be a good oscilloscope for me to look for?<BR>Thanks,<BR>Mike<P>------------------<BR>


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 Post subject: Oscilloscope info
PostPosted: Mar Mon 17, 2003 8:27 am 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 2846
Location: Warwick,RI
Controversial subject!Tektronix is a favourite name among scope users and many members of this forum.They are extremely well made,but the older ones are *heavy** almost beyond imagination and are large and take up a lot of bench space.<BR>I am not a weakling by any means but I once bought a Tektronics scope at a ham silent key sale and had some dificulty getting it from the display table into my car.It was like wrestling with a huge bag stuffed full of overweight alligators.<BR>The more complex,modern scopes often allow you to view two separate waveforms at the same time(dual trace) and have triggered sweep which means that the waveform you are viewing at the moment triggers the scope circuits into sweeping,rather than depending on an internal scope circuit to do that job.<BR>This gives more stable displays that require less fussing to lock in and read.<BR>I believe that triggered sweep is pretty much a necessity for use in servicing modern,solid state devices.<BR>Those of us who are members of the KISS club("Keep it Simple,Stupid") and use a scope only on vintage equipment from the 40's and 50's are happy with simpler,cheaper scopes such as were offered by Heathkit and Eico and NRI/Conar,among others.<BR>You will find these simple ones by the ton on eBay at prices from maybe $25.00 to perhaps $50.00 depending largely on how clear the ad photo is and how well the ad was written.<BR>The two problems with all eBay test equipment is that(1) most sellers have no idea what they are selling and either can't test it or imagine it must work fine simply because it lights up and did not burn the house down when plugged in,and (2)Do not pack heavy,fragile objects adequately so your scope arrives with smashed tubes and a dented cabinet.If you can work with a seller on these points,and are willing to accept the fact that your eBay scope will probably need servicing before you can use it,then eBay may be ok as a scope source.<BR>Malcolm Leonard<P>------------------<BR>


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 Post subject: Oscilloscope info
PostPosted: Mar Mon 17, 2003 8:47 am 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 8
Location: Brimfield, IL
<BR>I bought my scope from eBay. I paid 100.00 for a 1991 3-channel Kenwood CS5165 and bought the probe from ProbeMaster. The manual had to be ordered from Japan and took 4 months to get.<BR>Its an analog type, 60 Mhz and works great.<BR>The Tektronix scopes are ALWAYS expensive, because they are the best and most sought after.<BR>Mine does what I want it to do (audio projects stuff). If I was working with one for a living, Id get a good 100mhz+ Tektronix scope and a good set of probes (with all the stuff). Be ready to shell out 500.00 for some of these scopes (from the last time I bought mine).<P>------------------<BR>


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 Post subject: Oscilloscope info
PostPosted: Mar Mon 17, 2003 5:03 pm 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 5136
Location: Rochester NY USA
I have had four scopes - <P>HP 130C - $30 from a surplus store - works fine, but trace drifts a lot... it's only one channel and 500 KHz, but it has a nice large round CRT.<P>Tek 922 from EBay $50, included two probes, works great. Manual was $11, also from EBay.<P>Tek 922R - free from a friend, but no trace and broken off channel 2 knobs - I'll get to this one eventually... probably the HV tripler.<P>Tek 545 - $20 - stripped this one for parts, as I had no room for it. What a monster! But it was a gold mine of tubes, sockets, terminal strips, etc. If anyone needs any 500 series parts, just holler!<P>The Tektronix 400 series is good and relatively cheap, if you can find one in good shape. And they are repairable - no custom ICs. The 900 series is relatively fragile (plastic case, tiny knobs) but a good performer. <P>Telequipment scopes should be avoided, no matter how cheap...<P>------------------<BR>


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 Post subject: Oscilloscope info
PostPosted: Mar Mon 17, 2003 6:19 pm 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 3550
Location: Harviell MO USA 63945 (12 miles S of Poplar Bluff)
Tom, I'm pretty sure the hp 130C is a dual trace scope. The 130C is a good audio scope, better than the Tek 503, its equivalent in that brand. The drifty trace was not a model problem, but a problem with that particular one. I've always like the 130C for its really crisp display.<P>Tek had the "old" 400-series and the "new" 400-series. The "old" had no custom ICs but only solid state components and a couple of Nuvistors in the early ones. The "new" has a Tek-made trigger/sweep logic IC in most of them and the 475 and 485 have Tek-made ICs in the vertical system as well. Don't let the Tek-made ("custom") ICs scare you off, though. There were hundreds of thousands of each model of Tek scope made and the hangar queens abound out there for spare parts. Obtaining manuals at lower prices can be difficult, but don't forget that with Tek, you're usually buying what was originally a $3500 scope for $350 in cherry condition, so spending $100 for a service manual still give you one whale of a bargain for a high-quality scope.<P>But as mentioned, if all you intend to do is antique radio repair, there's no sense in spending a lot of bucks for a scope. Some folks on this forum don't ever use a scope in this hobby.<P>Dean<BR><P>------------------<BR>


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 Post subject: Oscilloscope info
PostPosted: Mar Thu 27, 2003 7:03 am 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 19
Location: Melrose MA USA
Mike:<BR>I have a Tektronix 2225 50 MHz scope that does everything I could ask. I bought it nearly new for $35. I have seen some decent prices for these on Ebay. The scope is not heavy and very full featured.<P>Brian Denley<P>------------------<BR>


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 Post subject: Oscilloscope info
PostPosted: Mar Thu 27, 2003 9:03 pm 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 329
Location: Alton ,Il 62002
I have 3 Tektronix 2 Sony/Tektronix 335'S and a 422 . Just because it says Tek doesn't always mean big and heavy or exspensive. Paid $50 for the 422 and $300 for one of the 335'S several years back .For TV or radio repair A 20 or 30 MHZ scpoe is all one needs . If I could only have one piece of test equipment it would be a toss up between a fluke 87 or my 335 .<P>------------------<BR>Mark Rotsch


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 Post subject: Oscilloscope info
PostPosted: Apr Fri 11, 2003 10:16 pm 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 1630
Location: Silver Spring MD, USA
HalliFan wrote:
<font>quote:</font><HR>Originally posted by Tom Bavis:<BR><B><P>Telequipment scopes should be avoided, no matter how cheap...<P></B><HR>
<P>Tom -<P>Could you elaborate?<BR> <BR>I have a Telequipment D45 I got for $8 at my church rummage sale. Still sitting under my bench one year later untouched. I have the manual for it, can't remember what modules it has in it.<P>Maybe it has a few good Mullards in it I can sell on ebay? <IMG SRC="http://antiqueradios.com/forums/wink.gif"><P>Kevin<P>------------------<BR>


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 Post subject: Oscilloscope info
PostPosted: Apr Sat 12, 2003 7:02 am 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 5136
Location: Rochester NY USA
Twenty years ago, I did quite a bit of test equipment repair, after everyone in the cal lab was laid off. I fixed a lot of TEK 900 series scopes easily enough. But the Telequipment ones... EVERYTHING was intermittant - the pots, switches, connectors. I think we had three or four, with one or two working at any given time... even the Heathkits were better.<P>------------------<BR>


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 Post subject: Oscilloscope info
PostPosted: Apr Tue 15, 2003 4:16 am 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 3550
Location: Harviell MO USA 63945 (12 miles S of Poplar Bluff)
Telequipment was a wholly-owned subsidiary of Tektronix for many years and Tek dumped TQ when they came out with the T900-series "Hoover" scopes. I, along with most other Tektronix techs, loathed working on TQ stuff. The manuals are poor, cal procedures inadequate and some of the circuits, especially around the DC restorer in the CRT circuit downright bizarre. I once let a screwdriver slip in that area of one of those things once and wiped out a string of 5 or 6 transistors like they were firecrackers. We had sales engineers in the Dallas Field Office that refused to sell the line because it would scar their sales reputation. However, there are some old TV repairmen who will swear by them while we techs swore at them.<P>There was the time that I made up an April Fool's "Marketing Sales Release" (an internal sales flyer) describing a new sampling plug-in for the D83 (I think it was) for only $1500. I did such a good job on it that no one thought it was funny thinking that the product was actually going to be hitting the market. Stuff like that isn't funny at all if at least some of the folks who read it realize it's a hoax.<P>Dean<BR><P>------------------<BR>


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 Post subject: Oscilloscope info
PostPosted: Apr Tue 15, 2003 4:43 am 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 30698
Location: Pocasset, Cape Cod, MA
Probably used a motor-driven commutator for the sampling, eh?<P>------------------<BR>


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 Post subject: Oscilloscope info
PostPosted: Apr Tue 15, 2003 10:08 pm 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 3162
Location: Cockatoo, Victoria, Australia
No Alan; Peddle.<BR>Don Black.<P>------------------<BR>


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