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

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)

 

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

Cyclotron Amplifier ...Cathode output typology for nice matching w SPK

   

Triodes tube 6C33 Cathode output

Pentodes tube EL34 Cathode output

 

The Amazing FET Circlotron

                              https://www.youtube.com/watch?v=tzhZg_IbFe8

BAT（Balanced Audio Technology） VK-55SE

6C33 inside

Diy low noise tube pre-amplifier 6B-R22 ~modify

 

Diy another rare low noise tube pre-amplifier 6B-R23 ~vs 6B-R22

 

Diy another rare low noise tube pre-amplifier 6B-R23 ~vs 437A

6B-R23

6B-R23

437A

6B-R23

437A

6B-R23

6B-R23

437A

6B-R23

6B-R23

437A