purchase wrong tube socket of big 12 pin

socket pin grap force too weak

for 6jm6 size too big

Dim. record

DAC rectify tube 6z4 change to 6x4 ~2

drill slot because double trace layout

playback -1 ...before

                                                      ... after

playback -2 ...before

                                                      ... after

playback -3 My all ...before

                                    ... after  w obviously diff. fu

                                         Mariah Carey wesome

playback -4 ...before

                                   ... after  oops wrong record

playback -5 ...before

                                                      ... after

 

rectify tube 6z4 change to 6x4

6x4 raytheon

                              6Z4 北京曙光

tube amp. DAC w 6z4....coffee shop

https://kao211.blogspot.com/2012/10/da-build-in-human-vocal-4-times.html

https://kao211.blogspot.com/2023/07/jukeboxss-audio-amplifier-modify-volume.html

before tube Tung-Sol 6x4
replaced rectify tube  by 6x4 raytheon
sound more nature ~ more detail

low noise amp. w 6x4 raytheon inside

https://kao211.blogspot.com/2024/07/diy-another-rare-low-noise-tube-pre_28.html

Happy jukebox day

 

re-placement high voltage transformer......need re-order high voltage transformer

new order high voltage transformer

re-placement

take off choke inductor
the space for dual rectifier cap.

 

P-P circuit implement......this case just could tie circuit to push pull amp.

CH-R 6JM6 PP playback sound 1

CH-R PP 6JM6 G1 shunt Imp.resistor tie to GND

CH-L PL519 PSE playback

CH-R 6JM6 PP playback sound 2

CH-L PL519 PSE playback

CH-R 6JM6 PP playback  sound 3

CH-L PL519 PSE playback

CH-R PP 6JM6 G1 shunt Imp.resistor tie to -32V playback sound 1

CH-R PP 6JM6 G1 shunt Imp.resistor tie to -32V playback sound 2

CH-R PP 6JM6 G1 shunt Imp.resistor tie to -32V playback sound 3

CH-R PP 6JM6 G1 shunt Imp.resistor tie to -32V playback

CH-L PL519 PSE playback

CH-R 6JM6 PP playback w RIAA (switch in DAC)

CH-R 6JM6 PP playback no RIAA (switch in DAC)

 

211 VT4C mono amp. L-ch SPK w noise..the check record

https://kao211.blogspot.com/2011/01/toy11-vt4c-211amp-5-verify-211-ac.html

recall ...211 VT4C plate voltage setup in 1265V w tube 211

recall ...high voltage capacitor explode

                                

                                                                

https://kao211.blogspot.com/2019/03/mono-mono-vt-4c-211-tube-amplifier.html

the record

                                      after repair ... L-ch playback check only