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Old 29th July 2005, 02:16 AM   #1
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Default I need a scope

OK well I have been checking the second hand scope market in Australia and it isn't looking that promising.

on ebay at the moment, Tektronics 475 already up to $355 Aus and still one day to go (about 5 people bidding).... another one which is currently at $152 with 5 days to go..... I have seen tektronics 2235 selling for nearly $900 Aus... so I'm thinking it is going to be hard to get a bargain second hand scope.....

I found this at Dick Smith http://www.dse.com.au/cgi-bin/dse.st...uct/View/Q1803

It is only single channel and only 10Mhz, but it is also only $158 Aus.... Would one of these be adequate for basic amp testing???

Tony.
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Old 29th July 2005, 02:23 AM   #2
cbm5 is offline cbm5  United States
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A year ago I picked up a Tektronix 465B on eBay with spare reticule, fuses, four probes, etc. Cost me $100. The 465B is about 20 years old now, don't get a plain 465 because those are 30 years old.

Despite being 20 years old, they are a common and well-respected 100MHz dual-channel analog scope. They can be repaired and there is lots of information on how to do so.

Just haunt eBay for a few weeks, and don't get into a bloodlust for the first one you see. I saw a similar scope rocket up to $300 because two idiots got into a bidding war and made it personal. When that happens I just sit back and let it slide by, there WILL be more chances.
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Old 29th July 2005, 02:31 AM   #3
Apex Jr is offline Apex Jr  United States
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I agree, the 465B is a standard and well documented
they are going for $100.00 to $250.00 and worth it.
There are variations too, the DM 44 and 41 packages
digital multimeter and counter I think. It is a workhorse
and can't go wrong at these prices if working.
US Dollars. Check prices for shipping and see if it comes
out better then buying in Austrailia.
Steve @ Apex Jr.
www.apexjr.com
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Old 29th July 2005, 02:35 AM   #4
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I totally agree the 465B is the best value in CRT type scopes out there. There are always a few on E-Bay that are available completely calibrated and I would reccomend one of those if you are not test rquipment savy....... Another good place to do buisness with is Sphere Research in BC Canada. They are very honest, have a large selection, and stock tons of Tektronix parts and CRTs. Stay away from H-P scopes.... Parts are harder to find and the performance was never as good as Tektronix... but build quality is definately there in the H-P stuff.


Sphere Research

I presently own 9 different Tektronix scopes.... but then I am a test equipment junkie of sorts and love to restore them as well.


One thing to watch out for is the later 2200/ 2400 series scopes. They have switching power suppklies that can give fits and can be diffivult to repair. The 465 has a power tranny and all linear supplies of incredible stability. The CRT's in those 2400 series scopes are not nearly as sharp as the earlier 400 series crt's and I believe these were the last TEK CRT scopes made. The quality of the CRT's even though made by Tektronix was vastly inferior to the earlier stuff.

What ever you buy be sure you have a return priveledge!! If they won't then don't.

Mark

P.S. Another one to avoid is the Tektronix 465M. It vaguely resembles the 465 outside but inside its a real piece of junk.

Also, the finest scopes made were the 7400, 7900 and the last series of lab scopes. These are usually largish and require a cart but that are the best of the best in terms of analog scopes. Some had a bandwidth well into the several GHZ region......
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Old 29th July 2005, 02:41 AM   #5
Ron E is offline Ron E  United States
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Not sure how things work in OZ, but here in the USA often the local schools (universities and tech colleges) have auctions where teh y sell off excess inventory or outdated equipment. Many of the scopes on the second hand market in the <40-60MHz range are old school scopes.

I bought a Leader 1021 20MHz scope and it works fine. Plenty of bandwidth for any Audio Frequency task.

I am really dubious about Ebay. Sure if you can wait and watch for months, you might find a deal, but for the most part it appears to me that ebay is a seller's market and stuff goes for more than in other venues.

One sad observation about ebay is that it has begun to ruin pawnshops. One used to get a good deal at pawn shops, now they look for prices on ebay and price accordingly - sad thing is that they don't know the products so they are trying to sell incomplete or broken merchandise for perhaps 5-10% under retail......
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Old 29th July 2005, 02:53 AM   #6
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Thanks for the quick replies guys I'll have a bit more of a look around, and not jump into anything! have just been a bit frustrated of late trying to debug my amp! Ron E, I hadn't even thought about pawn shops, will have to look into that!!

Tony.
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Old 1st August 2005, 11:17 AM   #7
tekman is offline tekman  Germany
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@wintermute:

Hi Toni, maybe you can also look for "government surplus" parts.
This is also a chance to get nice reliable equipment.

if you have friends/relatives here in euroe, especially EC : contact me via PM, so we can work out quickly something useful for you. I have a private collection, and can give some info on Tektronix, HP, Philips, etc. Mail is: and_de@gmx.de




hth,
Andreas
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Old 1st August 2005, 01:00 PM   #8
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Thanks Andreas,

I'll keep looking I'm hoping I can get my amp problems sorted without the cro, it would have made things easier though

I'll do a search on the government site and see what comes up!

cheers,

Tony.
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Old 2nd August 2005, 06:05 AM   #9
tekman is offline tekman  Germany
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Hi Tony,

good idea. In case you still need help or a CRO, feel free to contact me via private email.

Good Luck!

Andreas
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Old 2nd August 2005, 03:24 PM   #10
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Quote:
Originally posted by Mark A. Gulbrandsen
One thing to watch out for is the later 2200/ 2400 series scopes.
Mark,
does the 2465B also fall in that category ?
For my taste, that's the absolute drooler machine, lowest i have seen till now is $1600.

(i just snatched a 100 MHz DSO from the web for $60 yesterday, and downloaded the 192 page service manual pdf for free last night, feeling pretty happy again)
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