RV-6 TAXIED ONTO RWY 30R AT SJC WITHOUT ATC CLRNC.

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I WAS IN THE RUN-UP AREA TRYING TO UNFOUL A NASTY L MAGNETO. I HAD SPENT QUITE A BIT OF TIME IN DOING SO. FINALLY; IT CLRED. HOWEVER; I WAS STILL PREOCCUPIED WITH THE PROB. I TAXIED INTO POS BEHIND A CESSNA 'DAB.' THE TWR TOLD CESSNA 'DAB' TO TAXI INTO POS AND HOLD. I THEN TOLD THE TWR 'EXPERIMENTAL 'ABC' READY FOR TKOF.' I THOUGHT THE TWR CALLED ME BACK WITH INSTRUCTIONS 'CLRED TO TAKE OFF RWY 30R.' I RESPONDED WITH 'EXPERIMENTAL 'ABC' CLRED TO TAKE OFF RWY 30R.' I CROSSED THE HOLD BARS ONTO THE RWY. I HAD CONFUSED 'ABC' AND 'DAB.' THE TWR SEEMED CONFUSED AS WELL. LECTURED ME FOR NOT HOLDING; AND THEN CLRED ME FOR TKOF. I; OF COURSE; SAID I WAS SORRY. I HAD OBVIOUSLY CONFUSED MY TAIL NUMBER. IN LOOKING BACK; 4 FACTORS CONTRIBUTED TO THIS PROB: 1) I WAS CONFUSED WITH TAIL NUMBERS. 2) I WAS PREOCCUPIED WITH THE MAGNETO PROB; THOUGH I HAD FIXED THE PROB. 3) TWR SHOULD HAVE STOPPED ME WHEN I READ BACK CLRNC FOR ONE PARTICULAR FLT NUMBER; AND ADDRESSED TWR WITH EXPERIMENTAL FLT NUMBER. 4) I MUST ALSO ADMIT THAT WHEN I'M NOT FLYING THE EXPERIMENTAL ACFT; I SPEND QUITE A BIT OF MY CFI TIME IN OTHER ACFT. IN THE FUTURE; I WILL BE MORE CAREFUL.