HK. 西電胡 WE205D's phono stage of WE129A ~duplicate vintage WE riaa profile

master WE205D

@500hz~10khz close real 600ohm Imp.

the RIAA after 1954 

totaly diff.

20260104 33rpm vinyle playback...Eva Cassidy

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

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

                 

                 

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

VT4-C 211 left amplifier volume trimmer w noise

purchase new one

usage 6922 ～6JM6 SE amplifier drive left speaker 

left 6JM6～right 211 amplifier 

verify DAC switch to Vinyle RIAA profile 

change another DAC verify Vinyle RIAA profile playback 

Jukeboxs AMI H200 amp. rectify tube 6z4 change

 

before

after

AMI H200 amp. 

YT Shorts media upload the volume gain is bigger than blog upload

Louis Armstrong vocal "'Twas the Night Before Christmas"

https://www.youtube.com/watch?v=9df5v2HiaWc

https://www.youtube.com/watch?v=cmt2TZWGoO8

re-edit 頻率響應是不是唯一的東西........................................ recalled the struggle of The speakers making by hand just for good sound article

  everything start from here...since 2013

頻率響應是不是唯一的東西 

 譯...Ultraudio   Frequency Response Isn’t the Only Thing

http://www.ultraaudio.com/opinion/20100501.htm

the choice of crossover topology

the fs of woofer choice

the imp. profile of 15'' woofer (exp.)

the impedance of 15'' woofer match example

woofer Impedance matching conjugate example

Impedance xcover profile of 8 ohm mid horn driver

Impedance xcover profile of 16 ohm mid horn driver

mid horn Impedance value deceive by how many driver cascade

purchase wrong tube socket of big 12 pin

socket pin grap force too weak

for 6jm6 size too big

Dim. record

recived ...shipping from China