Thank you very much for your quick reply! I guess I will save 100 pounds
By the way is there any advantage of buying the 200mhz version apart of keeping your warranty (which anyway I guess is useless since I am buying the scope from China) ?
The 60MHz and 100MHz models come with 150MHz probes. I expect the 200MHz models will come with 200MHz probes.
Apart from that ...
all current 60 and 100MHz models are using not that great (for hacking over 100MHz bw) combination of resistors in input stage.
When hacked to 200MHz, there is up to +5dB overshoot at 150MHz (depends on probe type and termination kind)
I've made tons of measurments on current models (and where to modify):
http://www.mikrocontroller.net/attachment/173049/mod_input_circuit.pdfof my old Tekway DST1202B
http://www.mikrocontroller.net/topic/249628?page=8#3092292of how bad the frequency response is on current60/100MHz DSO hacked to 200MHz
http://www.mikrocontroller.net/topic/249628?page=8#3098757and how it can be improved to near perfect (don't forget, this is flat-response DSO, this overshoot need to be there)
http://www.mikrocontroller.net/topic/249628?page=8#3093970Short said, by replacing the 4x22R resistor arrays in inputt stage the frequency response is already better (or on what it was on original 200MHZ DSO).
This can be however even more improved :
RX1_1 = RX1_2 = RX1_3 = RX1_4 = change all to 270R 0.1% (digikey 4 x P270DBCT-ND)
RX2_1 = RX2_2 = RX2_3 = RX2_4 = change all to 270R 0.1% (digikey 4 x P270DBCT-ND)
RA01_1 = RA01_2 = change all to 4 x 33R 1% (digikey 2 x CRA6E833.0ACT-ND)
RA02_1 = RA02_2 = change all to 4 x 33R 1% (digikey 2 x CRA6E833.0ACT-ND)
R01_25, R02_25 = change to 49R9 0.1% (digikey 2 x P49.9DBCT-ND)
R01_27, R02_27 = change to 120R 0.1% (digikey 2 x A103149CT-ND)
R01_29, R02_29 = change to 1R (what so ever 1206 resistors)
As the original probes are anyway not so good (oh well, they good up to 100MHz, for sure) it might change them to different models as well,
in my measurments you can see the original probe results (PP-150), some better chinese probes from Texas (TX250 -simply ebay "texas probes")
and more expensive 500MHz passive probes from Testec (HF-512).