 |
| before |
 |
| 20251013 record |
 |
| take high voltage Cap. |
 |
| -63V F-Self-biased source of negative voltage |
 |
| ref. circuit |
2026年3月1日 星期日
Cyclotron Amplifier ...modify to 6JM6 Cathode output typology~2
2026年2月18日 星期三
Vinyl phonostage ...RIAA woofer profie w switch of First order ~ Second order
 |
| RIAA woofer profie of Second order |
RIAA profile in first order
RIAA profile is First order+Second order
RIAA profile in first order
RIAA profile is First order+Second order
 |
| left channel playback only |
RIAA profile in first order
RIAA profile is First order+Second order
final tuning first order+2nd order playback
RIAA profile is First order+Second order
Left Channel playback only
RIAA profile is First order L Channel playback only
RIAA profile is First order+Second order
Left Channel playback only
小雜魚逆流而上
2026年1月24日 星期六
Vinyl RIAA profile evaluation
 |
| https://youtu.be/Imqdj9XM-Zc?si=Xn4Z2EBGSx0lMbZT |
 |
| 33 rpm 8.1'' |
AMI H200 playback Danny Boy
verify RIAA profile
EP 7'' 45 rpm everybody wants to rule the world
tear for fear
EP 7'' 45rpm
33rpm
Violin Concerto No. 4 in D Major, K. 218: I. Allegro
Martzy
vinyl 45rpm
2026年1月22日 星期四
re-modify vinyl phonostage RIAA profile~2 2026 Jan
after re-modify RIAA profile
reduce the sound of high volume ~last time
the sound of high volume ~last time
this time modify
vinyle 33rpm playback Eva Yesterday R channel only
this time modify
vinyle 45 rpm playback 鄧麗君 R channel only
 |
| 45 rpm vinyle VANESSA FENANDEZ |
last time modify
vinyle 45 rpm playback
this time modify vinyle 45 rpm
playback VANESSA FENANDEZ R channel only
the RIAA profile playback w DAC+RIAA
YT download mp3 of VANESSA FENANDEZ
 |
| https://www.youtube.com/watch?v=olFzozK9ric&t=10s |
2026年1月17日 星期六
re-modify vinyl phonostage RIAA profile
 |
| 20251227 mofify record |
20251227 playback record
reduce the sound of high volume
after re-modify RIAA profile reduce
20251227 playback record
the sound of high volume
 |
| 45rpm EP 7'' |
 |
| to Amy. |
mono tube amplifier volume trimmer need to replace a pair of trimmer for L-R channel together
 |
| 20251225 record |
 |
| long time waiting for trimmer purchase |
L channel after replacing the new volume trimmer
 |
| replacing trimmer already |
R channel still usage old trimmer
new volume trimmer
old volume trimmer
 |
| two channel trimmer volume replaced |
|
| https://www.youtube.com/watch?v=olFzozK9ric&t=10s |
the RIAA similar between upper link and this one
YT download mp3 playback w DAC+RIAA
|
| 45rpm vinyle playback |
Vinyle phonostage RIAA low volume need modify
re-modify AMI H200 phonostage RIAA curve
 |
| 20251221 playback record |
20251221 playback record
after re-modify RIAA profile
reduce the sound of high volume
20251221 playback record
reduce the sound of high volume
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