What's a good beginners Oscilloscope? - Page 2 - diyAudio
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Old 23rd November 2002, 03:17 AM   #11
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$500 will get a lot of scope on the used market. However, be sure you budget some extra money for probes. A lot of the used scopes don't have any probes for some reason. I wonder where they all go... Probably to the same place where all the knobs go from the antique radios!

You may find that a set of probes will cost as much as the scope. Before buying probes, be sure to check out some of the probe tutorial stuff on Tektronix's web site. The info there will help you figure out exactly what sort of performance you need to match your scope, and will keep you from overpaying by buying too much probe.

MR
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Old 23rd November 2002, 03:56 AM   #12
halojoy is offline halojoy  Sweden
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Default Re: Your D43R

Quote:
Originally posted by BC108man
Halojoy,

Happy to hear you like the scope. I used to work at the Telequipment plant in Hoddesdon (Hertfordshire) although that was after they were acquired by Tek. I stayed for a few years, but Tek wasn't really interested in that market. So I moved on.

Anyway, it's a fine instrument, and there is a manual online at:
http://www.thevalvepage.com/servdata...p/d43_main.pdf

Hope this helps.

Cheers, BC
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Old 23rd November 2002, 04:13 AM   #13
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Default 500 scope...

Double that $500, Spend a $1000, and get a 60Mhz Tektronix TDS1000 series scope. Again, the scope may be a little more than a begineer needs, but it does offer FFT as standard (FFT being a poor mans spectrum analyzer)

(I really really really really really like the new TEK scopes) You can't beat them!

-Dan
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Old 23rd November 2002, 04:36 AM   #14
halojoy is offline halojoy  Sweden
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Default A tube precision Vertical Amp

I imagine a vertical amp in an oscilloscope
must have some very high qualities.
It can be interesting to see how this was solved in a tube amp.
The D43 uses EF184 penthodes and ECC88 triodes.
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Old 25th November 2002, 04:26 AM   #15
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Thanks for all of the advice guys. I picked up a Tektronix 2235 100 MHz dual channel scope with probe and manual off of ebay for $309 plus about $20 shipping. http://cgi.ebay.com/ws/eBayISAPI.dll...tem=1920775035

$330 is a little more than I wanted to pay, but I saw that manuals and probes were commanding high prices, so I thought I'd spend a little extra and get everything at once.
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Old 25th November 2002, 12:57 PM   #16
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Default you can pay that much for probes

don't skimp on probes -- buying the entire kit was a good idea. The 2235 should last you about 70 years or so.
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Old 13th February 2003, 01:06 PM   #17
EC8010 is offline EC8010  United Kingdom
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Default Re: A tube precision Vertical Amp

Quote:
Originally posted by halojoy
I imagine a vertical amp in an oscilloscope
must have some very high qualities.
It can be interesting to see how this was solved in a tube amp.
The D43 uses EF184 pentodes and ECC88 triodes.
Yes, and no. Oscilloscopes vertical amplifiers need bandwidth from DC to light, but their noise and distortion performance only needs to be 40-50dB down for it to be invisible on the CRT.

If you need them, I have original paper manuals for Telequipment plug-in amplifiers Type A, C-2, and K.
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Old 13th February 2003, 01:15 PM   #18
EC8010 is offline EC8010  United Kingdom
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Quote:
Originally posted by Corn-Picker
Thanks for all of the advice guys. I picked up a Tektronix 2235 100 MHz dual channel scope with probe and manual off of ebay for $309 plus about $20 shipping. http://cgi.ebay.com/ws/eBayISAPI.dll...tem=1920775035

$330 is a little more than I wanted to pay, but I saw that manuals and probes were commanding high prices, so I thought I'd spend a little extra and get everything at once.
I'd say that's a very reasonable price for a 2235, especially if it has the correct Tek probes. The significance of probes is that having spent all that money to get 100MHz (-3dB) bandwidth at the input BNC, you now want that bandwidth at the probe tip. You might think that 100MHz is plenty, but, trust me, you can't have too much bandwidth on an oscilloscope - even for audio. I've had audio cathode followers that oscillated at 70MHz...

Now all you have to do is to learn how to get the most out of your tool. Unlike music centres, all those controls are there for a purpose, so if you're not using some of them, you're not exploiting it to the full.
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Old 13th February 2003, 01:44 PM   #19
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you don't have to "quite" spend as much on probes as you do on the scope. I use a Tektronix 10X passive probe most of the time.

btw, there's a good article in the current issue of EDN on scope probes and the great Scope bake-off in which Tekronix failed to compete.
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Old 20th February 2003, 07:36 AM   #20
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That scope shoot-out was quite a story. Tektronix challenged LeCroy to a duel, then backed out at the last minute. Each company had proposed 4 speed tests; LeCroy won all 8 of them.

Cheers, BC
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