Takstar

[Voyager10]

CM-63 schematic and PCB layout.

Reposted from https://groups.io/g/MicBuilders/topic/takstar_cm_63_schematics_and/99890549 under the MIT license

 

[Voyager10]

See also this post from user @jp8 comparing CM-60 and CM-63:
https://groupdiy.com/threads/mxl-603-km84-replacement-pcb.72711/post-1131543

 

[Voyager10]

Takstar CM60 schematic, annotated with measured voltages:

 

[mhelin]

There are some missing component values, my guess is that C1 = 680pF (or use 1nF), C3 = 22nF, C4 = 1nF, C5 = 6.8pF, C6 = 27pf and C14 & C15 = 22nF (too big maybe?) from the MXL603S schematics. R1 & R2 = 1Gohm.

 

[Voyager10]

Here's the PCB overlay for the CM60 schematic from post #3:

 

[Voyager10]

CM63 schematic with measured DC voltages:

 

[k brown]

CM63 schematic with measured DC voltages:
View attachment 132626

Is the value of L3 known?

 

[Voyager10]

The original MicBuilders schematic has 62uH, but on both my CM63s it's hard to confirm this. Looks like the board cleaning process washed off almost all the inductor markings. I can see a faint blue stripe, but no real suggestion of red; could equally well be 68uH.