Vinyle phono stage RIAA profile modify～negative feedback

 

usage OP negative feedback 

create playback profile...before frequency setting to 20.8Hz 2.1kHz

45 rpm vinyle playback 

right channel playback @20.8Hz～2.1Khz

left channel playback @139Hz～2.1Khz

33 rpm Vinyle playback 

left channel playback @139Hz～2.1Khz

right channel playback @513Hz～2.1Khz

upper DAC preamplifier playback vinyle

switch to lower DAC preamplifier playback vinyle 

lower DAC preamplifier playback vinyle

45rpm 7'' & 33rpm 12'' switch by diff. source

select playback source between technics-sp10  and Garrard 401

suddenly ...Technics-sp10 turntable not work
check no 32VDC 

Btw Technics-sp10 power supply connect to turntable 
the 140V will boster to 260V

record Garrard 401 AC power setting