Rebbi,
Yes I recall that vaguely, but the real impedance can still vary widely by frequency and cannot be known to that degree of detail for certain unless measured or speced out perhaps at different frequencies rather than just a single generalized number, though 50ohm output is a very good number for a tube pre-amp in general FWIW.
Nevertheless, jumping from 10K input impedance to 10X that with a different amp will still likely have a positive effect I would wager, though perhaps less so than if the pre-amp did not appear to be well towards the favorable end of things in general already.
You'll only know for sure when you listen and compare.
Though, a tube preamp with relatively low output impedance feeding an amp with 100K+ input impedance should safely put things well into the "green" zone without doubt at least on paper, in that both numbers that determine the ratio are both now well into the green zone as well.
Yes I recall that vaguely, but the real impedance can still vary widely by frequency and cannot be known to that degree of detail for certain unless measured or speced out perhaps at different frequencies rather than just a single generalized number, though 50ohm output is a very good number for a tube pre-amp in general FWIW.
Nevertheless, jumping from 10K input impedance to 10X that with a different amp will still likely have a positive effect I would wager, though perhaps less so than if the pre-amp did not appear to be well towards the favorable end of things in general already.
You'll only know for sure when you listen and compare.
Though, a tube preamp with relatively low output impedance feeding an amp with 100K+ input impedance should safely put things well into the "green" zone without doubt at least on paper, in that both numbers that determine the ratio are both now well into the green zone as well.