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

                                            my all ～黃小虎

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

need re-order high voltage transformer...this case just could tie circuit to push pull amp.

                    Ref. Cyclotron Amplifier...because Cathode output the OT Imp.

                                setup up on high voltage transformer

this case just could tie circuit to push pull amp.

                                        to estimate amp.tube g１ voltage

last time

                                            

fix 2nd stage p-p voltage

shunt Ref. voltage to estimate amp.tube g１ voltage