Kikusui oscilloscope - Page 1
Forum section: electronics / testgear

author: RobertPPP
author_rank: Newbie
timestamp: June 14, 2024, 02:37:10 pm
content: Hi, I found Kikusui 7202a oscilloscope for under 90$. I wonder if this is a good offer. It is untested and it has crack on display. Does it have some kind of protection glass or is it broken tube? Overall seller has good ratings.

author: tv84
author_rank: Super Contributor
timestamp: June 14, 2024, 02:48:44 pm
content: My donations go to UNICEF...

author: Gyro
author_rank: Super Contributor
timestamp: June 14, 2024, 04:01:54 pm
content: Quote from: RobertPPP on June 14, 2024, 02:37:10 pmWalk away!

author: axantas
author_rank: Regular Contributor
timestamp: June 14, 2024, 04:04:14 pm
content: The tube ist broken.

author: Aldo22
author_rank: Super Contributor
timestamp: June 14, 2024, 04:13:22 pm
content: Quote from: axantas on June 14, 2024, 04:04:14 pmI think it's a protective glass.It doesn't seem to be unusual for it to break.Here, for example, you can clearly see that the tube is behind it.https://www.aef.se/Matteknik/Matteknikportal/Bildportaler/Bildportal_G-L/Detaljer/Kiku_497/Kikusui_497.htmBut I still wouldn't buy it.

author: RobertPPP
author_rank: Newbie
timestamp: June 14, 2024, 04:26:09 pm
content: Oh thank you very much, yeah I see. Unfortunately even shity analog scopes in my country are selling for 100$.

author: G-son
author_rank: Regular Contributor
timestamp: June 14, 2024, 05:03:58 pm
content: Must be what, 25 years old? For an analog scope that may not worry me so much, for a digital one there may be things like backup batteries for calibration data about to give up and huge issues to get it working again when they finally fail.

author: coromonadalix
author_rank: Super Contributor
timestamp: June 14, 2024, 05:23:15 pm
content: well i would say any of theses crt scopes, if you dont sse it working in person or thru some videos, don't get near thati understand finances may get difficult, but if you want to do some work, serious or not, you will need to invest at one time.the crack is the graticule markings window / bezel

author: TomKatt
author_rank: Frequent Contributor
timestamp: June 14, 2024, 05:48:24 pm
content: Even $90 is close to 25% of a really nice brand new DSO with much greater capabilities. While older equipment is often easier to repair, they are still complex devices requiring calibration and occasionally have components that are no longer available. Additionally, CRT circuits run atextremelyhigh voltages that can be lethal if you don't have experience working on them.Tempting as it may be, I'd only suggest old CRO gear to beginners if the price is very cheap AND the gear has proven to be in good working order. If you have ANY doubts as to it's operational status, I'd avoid at all costs.

author: le_yum
author_rank: Newbie
timestamp: June 14, 2024, 06:26:04 pm
content: Quote from: RobertPPP on June 14, 2024, 04:26:09 pmthat is in your country :https://www.eevblog.com/forum/buysellwanted/fs-(eu)-siglent-sds1102x-100mhz-2-channel-scope/

author: coromonadalix
author_rank: Super Contributor
timestamp: June 14, 2024, 07:48:35 pm
content: and the upgrade you can apply to this scope, is really giving it more value than you paid ....

author: BrokenYugo
author_rank: Super Contributor
timestamp: June 14, 2024, 07:59:35 pm
content: A scope CRT is a fairly delicate precision device, even if the vacuum is not broken a hard drop/hit can damage internal structures and ruin it, bad CRT effectively scraps most analog scopes.

author: Wallace Gasiewicz
author_rank: Super Contributor
timestamp: June 14, 2024, 08:30:17 pm
content: I would not buy this if I could not see it working.You could fix the graticule.But anything else is almost impossible to service on Japanese Scopes, although they are very good machines, there is no chance to get any Service Manuals on any Japanese Scope that I am aware of.The Scope Tube is a traditional tube, not just a Monitor like we see on some old digital scopes. If it is damaged, scope is not worth anything.Looking at the pictures, it reminds me of my HP 1980 (Introduced in 1985) Scope, a kinda cross between an Analog and Digital, with very unusual parts that cannot be found.By the way the Sigilent recommended is in Luxembourg. but it does sound like a decent deal.

author: Gyro
author_rank: Super Contributor
timestamp: June 14, 2024, 08:43:11 pm
content: Any half decent seller will at least power a scope up and show a picture of what happens - "untested" is not a good sign with that sort of visible damage. At least if it was showing something on the screen you would have some indication that, 1: the CRT vacuum is still intact and 2: that the deflection plates are possibly not distorted (although that would require both X and Y deflection being visible).Without that, again I would still say walk away. Paying $100 for some sort of functional scope in your country might or might not be good value. Paying $98 for something terminally broken definitely isn't.

author: TomKatt
author_rank: Frequent Contributor
timestamp: June 14, 2024, 08:47:31 pm
content: Scope crt tubes are precision components and shock can put them out of alignment even though they still work and show a trace. A cracked case or graticle can be flags that the scope has been dropped, which can damage the internal electron gun assembly.

author: stj
author_rank: Super Contributor
timestamp: June 14, 2024, 09:19:53 pm
content: as a Kikusui owner i'll give you some advicedont buy any kikusui product unless it's working AND you can get a service manual FIRST.btw, they use cheap crappy pots and rotary switches in their crt-based scopes