Blue Circle BC3 Galatea line-level preamplifier Page 2
Likewise, Yeung's insistence on the simplest feasible circuitry
influenced his choice of the 6922 tube, which contributes to the
Galatea's singular voicing and performance parameters—with
interesting implications for audiophiles with a yen for tube
rolling.  "The 6922 has a higher current gain, and higher
current capability, than the 12AX or AT, so it would drive a
longer cable without any loss. So I chose that as the buffer
stage. In the gain stage, because the 6922 is medium-mu and
medium-gain, I can have a slightly lower gain on the
preamp—which means you could have a higher signal/noise ratio
and a blacker background on a long cable run. Just enough gain
on the preamp to drive the power amp, but at the same time the
6922 is rugged enough to have a very high signal swing—it's
capable of 25V RMS. And the output impedance of the Galatea is
less than 180 ohms.  "Another point I would like to make is that
since the circuit is so simple, and essentially ad