I have made aftermarket filter boards for the Accuphase F-25.
These boards can be custom fitted with capacitors and resistors for any frequency from 50Hz to 15kHz.
The physical size and connectors match the original boards exactly.
This is a board custom made for 50Hz.
This is a measurement of a 150Hz version with the three different slope settings of the F-25
There is a 0,1dB and 5Hz error, but that is within the limits of the F-25 itself.
I use 0,1% resistors and 1% capacitors for better tolerance than the original Accuphase filters I have measured so far.
Resistors are Susumu metal film.
Capacitors are the superior C0G type for absolutely lowest distortion.
Any interest?
These boards can be custom fitted with capacitors and resistors for any frequency from 50Hz to 15kHz.
The physical size and connectors match the original boards exactly.
This is a board custom made for 50Hz.
This is a measurement of a 150Hz version with the three different slope settings of the F-25
There is a 0,1dB and 5Hz error, but that is within the limits of the F-25 itself.
I use 0,1% resistors and 1% capacitors for better tolerance than the original Accuphase filters I have measured so far.
Resistors are Susumu metal film.
Capacitors are the superior C0G type for absolutely lowest distortion.
Any interest?