DYNACO Dyna Stereo 70, Installation Instructions Manual

3 

(   ) Using a small screwdriver, remove the four (4) screws securing the “PC-3” circuit board to 
chassis, carefully remove old circuit board. 

REASSEMBLY

(   ) Using a small screwdriver, install new circuit board (79-001A) from BOTTOM SIDE of 
chassis, orient circuit board so C2 and C8 face front of amplifier and C1, C9 face output 
transformers.   

NOTE:

 amplifier will not work properly and may be damaged if circuit board is 

installed from the top 
 

(   ) Using a soldering iron, connect wire from pin #5 of left power supply socket (LPSS) to eyelet    
#3 on new circuit board (PCB). 
 
 
(   ) Using a soldering iron, connect bare wire from left RCA connector (ground terminal) to eyelet 
#24 on PCB. 
 
(   ) Using a soldering iron, connect 10 ohm (brown, black, black) resistor from pin #3 of LPSS to 
eyelet #8 of PCB. 
 
 (   ) Using a soldering iron, connect bare wire from right RCA connector (ground terminal) to 
eyelet #25 on PCB. 
 
(   ) Using a soldering iron, connect wire from right RCA connector (signal terminal) to eyelet #17 
on PCB. 
 
(   ) Using a soldering iron, connect 10 ohm (brown, black, black) resistor from pin #3 of right 
power supply socket (RPSS) to eyelet #10 of PCB 
 
(   ) Using a soldering iron, connect wire from pin #5 of RPSS to eyelet #18 on new circuit board 
(PCB). 
 
(   ) Using a soldering iron, connect wire from V1, pin #6 to eyelet #2 on PCB. 
 
(   ) Using a soldering iron, connect two wires from LPSS, pins #1and #2 to eyelets #4 and #5 on 
PCB. 
 
(   ) Using a soldering iron, connect wire from chassis ground lug to eyelet #9 on PCB. 
 
(   ) Using a soldering iron, connect two wires from RPSS, pins #1and #2 to eyelets #15 and #16 
on PCB. 
 
(   ) Using a soldering iron, connect wire from V3, pin #6 to eyelet #23 on PCB. 
 
(   ) Using a soldering iron, connect wire from V2, pin #6 to eyelet #1 on PCB. 
 
(   ) Using a soldering iron, connect wire from left RCA connector (signal terminal) to eyelet #7 on 
PCB. 
 
(   ) Using a soldering iron, connect wire from left bias potentiometer to eyelet #6 on PCB. 
 
(   ) Using a soldering iron, connect wire from V1, pin #4 to eyelet #11 on PCB.