1. Have you tried driving the amps directly from the Bricasti by using its volume control instead of the Avocet?
2. Have you tried some SS amps on the Allegras? Their non flat impedance affects the frequency response of your tube amps and they're not an easy load either.
https://www.stereophile.com/content/sonics-joachim-gerhard-allegra-loudspeaker-measurements
2. Have you tried some SS amps on the Allegras? Their non flat impedance affects the frequency response of your tube amps and they're not an easy load either.
https://www.stereophile.com/content/sonics-joachim-gerhard-allegra-loudspeaker-measurements