More often than not, when a preamp provides two sets of RCA output jacks they are simply wired together just inside the rear panel, as opposed to being driven from separate output circuits. So chances are you would be driving all three destination components with the same driver circuit in the preamp.
Along the lines of the earlier comments, how well that would work depends on the output impedance of the preamp (the lower the better), on how that output impedance varies with frequency (the lower it is at all frequencies, and the less variation there is, the better), on the sum total of the capacitances of all three sets of interconnect cables (the lower the better), and on the input impedances of the three destination components (the higher the better).
I couldn't find specs or measurements on the output impedance of the preamp, but I did find on this page the following statement:
The other usual concern is that if the preamp's output impedance rises significantly at low frequencies, to levels that are too high in relation to the combined (paralleled) input impedance of the three destination components, the deep bass could be rolled off. Based on the quoted statement, I would guess that you'll be ok in that respect, but the only way to be sure is to get specific guidance from CJ, or to somehow ascertain what the output impedance of the preamp is at the frequency for which it is highest (which is often 20 Hz).
The overall input impedance of the three combined loads is equal to the reciprocal of the sum of the reciprocals of their individual impedances. In other words, if the input impedances of the three loads are represented as Z1, Z2, and Z3, their combined impedance as seen by the preamp is:
Ztotal = 1/((1/Z1) + (1/Z2) + (1/Z3))
Ztotal should ideally be ten or more times higher than the output impedance of the preamp, at the frequency for which the output impedance of the preamp is highest.
The suggestion by Bruce (Bifwynne) of a buffer, such as the one that was made for him as described in some of his other threads, would be a good solution if that impedance matching criterion is not met without one.
Regards,
-- Al
Along the lines of the earlier comments, how well that would work depends on the output impedance of the preamp (the lower the better), on how that output impedance varies with frequency (the lower it is at all frequencies, and the less variation there is, the better), on the sum total of the capacitances of all three sets of interconnect cables (the lower the better), and on the input impedances of the three destination components (the higher the better).
I couldn't find specs or measurements on the output impedance of the preamp, but I did find on this page the following statement:
... the audio circuit of the Premier Ten consists of a single triode amplifier direct coupled to a triode cathode follower. The low output impedance of the cathode follower permits the use of the Premier Ten with highly capacitive amplifier interconnect cables without attenuation of the high frequency information.That is encouraging, and suggests that there will be no problem in the highs as a result of the interaction of preamp output impedance and the total of the three cable capacitances.
The other usual concern is that if the preamp's output impedance rises significantly at low frequencies, to levels that are too high in relation to the combined (paralleled) input impedance of the three destination components, the deep bass could be rolled off. Based on the quoted statement, I would guess that you'll be ok in that respect, but the only way to be sure is to get specific guidance from CJ, or to somehow ascertain what the output impedance of the preamp is at the frequency for which it is highest (which is often 20 Hz).
The overall input impedance of the three combined loads is equal to the reciprocal of the sum of the reciprocals of their individual impedances. In other words, if the input impedances of the three loads are represented as Z1, Z2, and Z3, their combined impedance as seen by the preamp is:
Ztotal = 1/((1/Z1) + (1/Z2) + (1/Z3))
Ztotal should ideally be ten or more times higher than the output impedance of the preamp, at the frequency for which the output impedance of the preamp is highest.
The suggestion by Bruce (Bifwynne) of a buffer, such as the one that was made for him as described in some of his other threads, would be a good solution if that impedance matching criterion is not met without one.
Regards,
-- Al