Choosing an analog Oscilloscope for adjusting CD laser

[JohnnyBeGood]

I am refurbishing electronics on ebay but never done CD players. I specifically want to refurbish Arcam 7, 8 & 9 CD players that they all use the KSS 240A laser.
I have been told to invest in a Hameg or a decent oscilloscope.
I usually fit a brand new laser which is the most common fault on them but don't really know how to make any further adjustments.
For example I just fitted a new laser in one of them and found that it plays ok up to track 5 but after that you start hearing a repetitive noise with every turn of the CD so I hope the oscilloscope will show me the problem.

Does it matter if the oscilloscope is 20MHz or 60MHz etc?

I have these two in mind will either of them be any good?

https://www.ebay.co.uk/itm/126405974869

and

https://www.ebay.co.uk/itm/186312721171

or can I get away with this one:
https://www.ebay.co.uk/itm/285783384470

I do not want to use it for anything else, just aligning the KSS 240A laser on these three Arcam models so I really specialise my work.

Thank you.

 

[Mooly]

A 20Mhz analog scope is fine for what you want but all things being equal a 60Mhz is a better bet. The Kikusui is also OK.

All three will be be far superior than any comparable bandwidth digital scope for this kind of thing imo.

You might find this interesting:
https://www.diyaudio.com/community/threads/sony-cdp790-and-kss240-restoration-project.226288/

All scope shots are with a 100Mhz scope but with it switched to 20Mhz bandwidth (which reduces noise and gives a cleaner trace)

 

[rgigante]

Make sure that these devices are correctly calibrated. In the first picture of https://www.ebay.co.uk/itm/126405974869 the calibration knobs are not in their default positions.