td75,
On behalf of your recommendations I bought the '2SC3260' on Ebay this morning; it will be coming from Taiwan. I will report back when it arrives. Thanks for the help!
The other component that failed was a RIFA 40/085/56 GPC metallised film capacitor. I think the board reference is C37. Or the component is next to C37.NTE2309 - would this perhaps be a suitable replacement?
http://www.nteinc.com/specs/2300to2399/pdf/nte2309.pdf
BTW what other components blew on your analogue board? My 240V board also had a blown fuse and burnt out bridge rectifier diodes. I never did get it working thoughPerhaps I should try replacing this Q10 as well. I did get a 110V analogue board from another very kind forum member, but they have quite a different PCB layout compared to 240V version and need a good quality step down transformer to use here in the UK.
Before I turned on the Macintosh I checked the analog board to assess its condition. I noticed that the film capacitor's case was cracked in places.
Once the Macintosh was turned on the capacitor exploded!
The following blog post helped me as we had similar problems: http://tinyurl.com/pz4w9gg.
I sourced a replacement on Ebay: http://tinyurl.com/p9pm3jh.
With regards to Q10; the component left three singe marks on the back of the analog board and its heatsink has been discoloured by heat.