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23rd April 2007, 08:39 AM
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diyAudio Member
Join Date: Apr 2004
Location: hanoi
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Pf 99
Hi,
On Andrea Ciuffoli's PF site, they said that " The input impedance is 47KOhm/1450pF and its resistive value can be adjusted by a pretty wide range, just using a different input resistance. The input capacitance, 1450pF, seems to be very high. Please note that a gain stage with a 1000 Ohm output resistance gives a > 100 KHz cutoff frequency. " Do they have any problem when use PF 99 with 2A3 pre-tube? Do we have any way to reduce input impedance and capacitance? Thanks, CMP.
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