Vinyl @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

Complex frequency synthesizers produce distorted and crackling sounds.

left channel playback @139Hz～2.1Khz

Complex frequency synthesizers produce distorted and crackling sounds.

33 rpm Vinyle playback 

left channel playback @139Hz～2.1Khz

Complex frequency synthesizers produce distorted and crackling sounds.

right channel playback @513Hz～2.1Khz

Complex frequency synthesis sounds normal

upper DAC preamplifier playback vinyle

Complex frequency synthesis sounds normal

switch to lower DAC preamplifier playback vinyle 

lower DAC preamplifier playback vinyle

Complex frequency synthesis sounds normal

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 

https://www.stereophile.com/content/emt-128-phono-preamplifier

    EMT-128phono stages

               

                 

EMT JPA-66 phono stages

 Remton LCR Mk2 phono stages
 https://the-ear.net/review-hardware/remton-lcr-mk2-phono-stage/

Moon by Simaudio 310LP

FM Acoustics 222 phonostage

Evething since ... the dazzling JPA66 phono preamp

The last WE129A Shenzhen friend ordered ...legend never ever

https://kao211.blogspot.com/2022/05/the-last-we129a-shenzhen-friend-ordered.html

https://www.stereophile.com/content/emt-128-phono-preamplifier-measurements

viewpoint of amp. flatness
(I think the test feed in vinyl sweep signal w RIAA profile)

30dB@10Hz~500Hz

STD RIAA 20dB@10Hz~500Hz

Vinyl Phono stage with x10 transformer Amplifier

https://kao211.blogspot.com/2022/04/vinyl-phono-stage-with-x10-transformer.html

Vinyl Phono stage with x10 transformer Amplifier -1 Jfet

https://kao211.blogspot.com/2022/05/vinyl-phono-stage-with-x10-transformer.html

Vinyl Phono stage with x10 transformer Amplifier -2 ...first time playback

https://kao211.blogspot.com/2022/05/inyl-phono-stage-with-x10-transformer.html

reduce hum sound on vinyl playback pre-amplifier and vinyle phono stage

https://kao211.blogspot.com/2024/11/reduce-hum-sound-on-vinyl-playback-pre.html