when I got the F2's home, immediately kicked the old F's to the curb (figuratively)
and hooked up to the BGW pre & power boxes. sounded great, BUT I had a channel imbalance,
having to adjust for about 25% on the Left and 75% on the right. knew something was wrong.
Same issue when switching over to the 250Ti's running off same electronics. Not the speakers problem.
Localized to the preamp. Subbed in the recently acquired Citation 21 , but the sound paled from what it could be. Pulled the 203 pre from the stack and took over to Doug (out star repair guy) ..he estimated 6 weeks turnaround , but called 2 days ago (was 3 weeks)
He found a bad tantalum cap. Mentioned that the 203 was exciting as he'd not seen one like that b4. "Those type of caps measured very low distortion."
Reinstalled it this AM , now I know what those F2's can really do. Superb. AND the 250Ti's improved that much also ,since on shared preamp ( it has 2 "mains" outs running to dedicated amps for each)
https://en.wikipedia.org/wiki/Tantalum_capacitor