Looking to take the LP12 a step further in the New Year. For similar price, option 1 is to DR the (in-service period) Supercap powering the Superline/Hi-line or option 2, go to Radikal 2 with current Radikal 1.
LP-12 is Ekos SE, Kore, Krystal into Naim 500 series
I have no experience of Supercaps or Radikals so can’t pass any comment on your options.
However, if you look at my profile you will see that our LP12s are similar. You do not say if you have yet fitted a Karousel. I have said numerous times in these forums that the Karousel is by far the best single upgrade I have ever made to my Linn.
If you don’t have a Karousel I seriously suggest this is the best upgrade you can make before considering either of your two original options. I wouldn’t mind betting that this will bring you a far greater SQ improvement & at a lower cost.
On my 40th anniversary LP12 Klimax I may get the radikal upgrade just announced but it will be difficult to get a side by side comparison so not sure at this stage
On my LP12 ARO which has Kore and Krystal , I’ve just added the superline/supercapDR - it is a massive improvement I must say . Probably add the Keel ARO in due course, but very costly so have to weigh that one up
So for you I would think Keel first, then get supercap DR’d