Source | Info |
---|---|
Stereophile | Stereophile: Feb 2001, vol 24, iss 2, Rubinson |
Stereophile | https://stereophile.com/tubepreamps/929 |
Positive Feedback | https://www.positive-feedback.com/Issue3/bc21.htm |
SoundStage | https://www.soundstage.com/revequip/bluecircle_bc21_preamp.htm |
SoundStage | https://www.soundstage.com/revequip/bluecircle_bc21.htm |