Brainwater...'less than 850 ohms' is quite high even for a tube preamp, although I have seen 2000 ohms quoted. High output impedance makes you sensitive to cable capacitance (HF roll off) and noise pickup. When I was into tubes, 600 ohms was the common value for 12AU7 cathode followers. Solid state preamps run 50 ohms and sometimes less.
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- 24 posts total
- 24 posts total