John used an Audax HD12.9D25HR on that speaker. I don't recall this tweeter using Ferro fluid. Audax still stocks the replacement coils. You can try Madisound, they don't list it, but they may have it, Falcon Acoustics in the UK list that they stock it... Then last resort is Audax.com
As far as the crossover, Johns parts were average to good for the day, He used decent coils, nice resistors for the time. This crossover used 1 electrolytic and several mylars... A cap replacement isn't too tough and you'd hear it.
As far as the crossover, Johns parts were average to good for the day, He used decent coils, nice resistors for the time. This crossover used 1 electrolytic and several mylars... A cap replacement isn't too tough and you'd hear it.