Accuphase E203

[MarcAlain]

Hello,

I am here with an Accuphase E203 integrated amplifier and I am missing the adjustment set up for the amplifier part.
I am talking about the following pots: VR1, VR2, VR3 and VR4.

Thank you for the help


Alain

 

[U130421]

schematic is found here Schematics A-C – Audio-Circuit [denmark]
I didn't found the VR1-VR4

 

[Max Headroom]

Hello.
VR 1 and VR 2 are bias current adjustment, and VR 3 and VR 4 are DC Offset adjustment.



Bias current is (1/0.22R) x 0.022V = 0.100A, IOW 100mA through 0.22R emitter resistor half generates 0.022V as per schematic.

Bias regulation is simple on this amp so be very careful setting values and check/monitor for drift, ie check this voltage value before and during adjustments.

Dan.

 

[MarcAlain]

Thanks a lot

Alain