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| AMI R1-1G vintage Jukebox |
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| find a home for him |
2026年1月11日 星期日
so sad only could cage him in garage ....after revival him
2026年1月10日 星期六
table DAC trimmer position
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| open case screws touch the volume trimmer cause one channel loses sound |
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| open case for change Raytheon rectify tube 6x4 |
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| record trimmer volume |
2026年1月9日 星期五
Rock Ola 495 1975 open box notifycation
 |
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| open upper cover |
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| tone arm green wire take off |
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| take off these fix tapes |
https://kao211.blogspot.com/2023/06/jukeboxs-1970s-old-friend-gone2.html
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| before Jukebox playback need 110VAC to 100VAC transformer |
會動的部件固定措施都要排除
2025年12月30日 星期二
HK. 西電胡 WE205D's phono stage of WE129A ~duplicate vintage WE riaa profile
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master WE205D |
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| @500hz~10khz close real 600ohm Imp. |
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| the RIAA after 1954 |
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| totaly diff. |
20260104 33rpm vinyle playback...Eva Cassidy
2025年12月27日 星期六
Vinyl phono stage RIAA profile modify～negative feedback
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| usage OP negative feedback |
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| 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.
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| 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
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| switch to lower DAC preamplifier playback vinyle |
lower DAC preamplifier playback vinyle
Complex frequency synthesis sounds normal
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| 45rpm 7'' & 33rpm 12'' switch by diff. source |
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| select playback source between technics-sp10 and Garrard 401 |
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| suddenly ...Technics-sp10 turntable not work check no 32VDC |
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| Btw Technics-sp10 power supply connect to turntable the 140V will boster to 260V |
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| record Garrard 401 AC power setting |
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| 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
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| viewpoint of amp. flatness (I think the test feed in vinyl sweep signal w RIAA profile) |
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| 30dB@10Hz~500Hz |
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| 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
2025年12月25日 星期四
VT4-C 211 left amplifier volume trimmer w noise
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| purchase new one |
usage 6922 ～6JM6 SE amplifier drive left speaker
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| left 6JM6～right 211 amplifier |
verify DAC switch to Vinyle RIAA profile
change another DAC verify Vinyle RIAA profile playback
2025年12月21日 星期日
Jukeboxs AMI H200 amp. rectify tube 6z4 change
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| before |
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| after |
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| 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
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