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IO-202 oscilloscope CRT substitution

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neazoi

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Hello,
I have this old oscilloscope. I need to ask a few basic questions based on your experience:

1. Will I be able to substitute the CRT with another one (probably smaller in size) and re-calibrate the amplifiers for the new CRT used? (assumming proper CRT voltage adjustments)

2. If I use this oscilloscope (5MHz) as an output to a 100MHz spectrum analyzer (which outputs X,Y signals) will I be able to display the frequency range of 100MHz with this 5MHz oscilloscope or do I need amplifiers that can do 100MHz?

3. Is there any simpler osciloscope to build using descrete components (still useable op to a few MHz) than this one?
 

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mister_rf

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1.
I guess it's possible to make the necessary changes, but for the moment we are unable to access the attached diagram.

2. If I use this oscilloscope (5MHz) as an output to a 100MHz spectrum analyzer (which outputs X,Y signals) will I be able to display the frequency range of 100MHz with this 5MHz oscilloscope or do I need amplifiers that can do 100MHz?
A spectrum analyzer include its own sawtooth generator to drive the oscilloscope in the XY mode or synchronize the internal sawtooth generator in the oscilloscope. Almost any oscilloscope can be used as a display for the spectrum analyzer.
 
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FvM

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Consider how a spectrum analyzer works and you'll see, that the RF bandwidth hasn't to do with the display bandwidth respectively scan speed.
 
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neazoi

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I guess it's possible to make the necessary changes, but for the moment we are unable to access the attached diagram.

Thank you very much for your replies. Here is the diagram. https://www.neazoi.com/io-102.gif

I like it's simplicity, but I would like to replace the CRT with a more modern one, smaller in size, and maybe a lower anode volrage one, so I guess I would reduce the voltage of the PSU.

But what about the diflection amplifiers? how should I re-tune them to respond to the new CRT?
 

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