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WTB: Analog oscilloscope for audio work

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Mischa:
Hi guys,

i'm new here and already introduced myself. I come from Slovenia, Ljubljana. I'm happy to see good forum like this about electronics that is not only audio oriented.
Last few days i'm searcing for second hand analog osciloscope for meassuring diy audio gear (mostly with tubes) like preamps, mics, limiters and their psu. Until now i used to meassure my stuff at friends place, or at home with my cheap DMM. But now i can't bother my friend anymore with growing demand and curiosity, or hope for good results without meassuring. DMM helps me to know what's going on with DC to certain limits, but i really need to see small AC signals, precisely calculate gain, make sweeps, check for oscillations, find zobel networks for best square wave response from transformers, and other things needed to make good pro audio gear.
I need at least 50Mhz BW, 2ch, 2mV sensitivity (or 5mV?), something like 400Vpp inputs, etc. So i checked eBay and some online shops for used Tektronix and HP, but shipping would be expensive because most of them are in the US. There are some threads here where users suggested Hitachis and Hamegs; from what i see they mostly have lower BW, sensitivity and less functions compared to Teks (i really trust their 2000 series, they look so well built and easy to calibrate and troubleshoot) and HP. I can spend up to 300 euros for instrument plus shipping because later i will buy signal generator too.
So i need help deciding what models/manufacturers/offers to look for and if there are any essential functions i shouldn't be without for my work. Oh, as this will be my first own scope i would really like to get something that will serve me well at least for some time, so i would rather have less functions than faulty scope. So please help me decide what and where to buy and be sure i will take time to search well.

Mischa

T4P:
20MHz would already be over the top for audio work anyway . So any 20megger scope from decent brands like HP , Tektronix , GW Instek ... whatever ! Dave knows more brands because i'm not from that era ... i wasn't even born yet .

If you are interested the UT81 scopemeter might suit your purposes .

aghp:

--- Quote from: Mischa on April 21, 2012, 08:05:28 pm ---Hi guys,

i'm new here and already introduced myself. I come from Slovenia, Ljubljana. I'm happy to see good forum like this about electronics that is not only audio oriented.
Last few days i'm searcing for second hand analog osciloscope for meassuring diy audio gear (mostly with tubes) like preamps, mics, limiters and their psu. Until now i used to meassure my stuff at friends place, or at home with my cheap DMM. But now i can't bother my friend anymore with growing demand and curiosity, or hope for good results without meassuring. DMM helps me to know what's going on with DC to certain limits, but i really need to see small AC signals, precisely calculate gain, make sweeps, check for oscillations, find zobel networks for best square wave response from transformers, and other things needed to make good pro audio gear.
I need at least 50Mhz BW, 2ch, 2mV sensitivity (or 5mV?), something like 400Vpp inputs, etc. So i checked eBay and some online shops for used Tektronix and HP, but shipping would be expensive because most of them are in the US. There are some threads here where users suggested Hitachis and Hamegs; from what i see they mostly have lower BW, sensitivity and less functions compared to Teks (i really trust their 2000 series, they look so well built and easy to calibrate and troubleshoot) and HP. I can spend up to 300 euros for instrument plus shipping because later i will buy signal generator too.
So i need help deciding what models/manufacturers/offers to look for and if there are any essential functions i shouldn't be without for my work. Oh, as this will be my first own scope i would really like to get something that will serve me well at least for some time, so i would rather have less functions than faulty scope. So please help me decide what and where to buy and be sure i will take time to search well.

Mischa

--- End quote ---

In this price class I have very good condition serviced, adjusted and tested Tektronix 2247A and 2246A.

They are not "as is", they are fully working and tested and good condition!

(also I have many other equipments (mostly HP and Tektronix) but I have not list and due to lack of time I have not tested all these fo ready to sell. Also some equipments are waiting final decision for sell out)

Shipping cost need individually check but of course inside EU there is no any other costs.

-aghp

tekfan:
I've sent a personal message if you're interested.

Regards

Mischa:

--- Quote from: Dave.S on April 22, 2012, 12:57:29 am ---20MHz would already be over the top for audio work anyway . So any 20megger scope from decent brands like HP , Tektronix , GW Instek ... whatever ! Dave knows more brands because i'm not from that era ... i wasn't even born yet .

If you are interested the UT81 scopemeter might suit your purposes .

--- End quote ---

Hi,

thanks for reply. You are right, strictly for audio more than something like 100kHz isn't needed. But i was told by people from audio biz that i need to look for 50Mhz scope or more to make sure there are no oscillations up to those freq. or higher. As i'm also into AD/DA converters i would like to be able to check clocks, etc
I looked at UT81; i need bench scope with bigger screen and a more intuitive controls. I don't want to loose my time setting scope and connecting it to computer, to do that i will buy good digital bench scope later. It has to be analog because i find digital scopes pretty noisy at mV levels, at least ones i tried were and didn't show small signals well. I often need to check mV levels from micropones, transformers, psu, etc. Another problem i found with some small scopes is they have low input impedance which loads source.
I already checked Dave's review of 2225 Tek scope on Youtube and some posts here about similar gear. He seem to prefer them for meassuring mV levels over new digital models which are within reach of my budget (300 euros for scope and shipping). I checked eBay and some shops for second hand gear but got lost. I'm not sure what to buy to make sure it will work at least for some time. And some might have usefull features while others not. It would be nice if i get some advices from people who are into similar things i am and have more experiences.


Guys, when i was writing reply i've seen new replies. Thanks a lot for helping me out, i will check this better tonight and write back.

Mischa

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