rear of front panel showing right, master, and left attenuator wiring 

front rear side, bottom right is ground on each attenuator where shields are connected


 


closeup of front panel power switch wiring and suppressor capacitor


 

red wire on selector is RIGHT output, green wire on selector is LEFT output, both to bottom
terminals of TAPE-SOURCE switch
white wire is 1st input left channel, orange wire is 1st input right channel (these go to rear panel RCAs)
 


 


2nd pair of inputs from selector out to rear panel RCAs (orange right, white left)


 


3rd pair of inputs from selector out to rear panel


 


4th and 5th pair of inputs from selector out to rear panel


 


* connect all RED transformer leads to bottom lug of terminal strip next to AC input filter 
* connect all PURPLE transformer leads to center lug of terminal strip next to AC input filter 
* connect all BLACK transformer leads to top lug of terminal strip next to AC input filter 
* take a 32" long white wire and use a drill to tightly twist a pair of wires to run from the front power switch to the rear fuse & terminal strip 
* use a file to remove oxidation on fuse leads
* connect a short red wire from the neutral (N) side of AC input filter to the bottom lug of terminal strip
* connect a short black wire from the line (L) side of the AC input filter to the back of the fuse holder
* one white wire from front power switch to top lug of terminal strip, the other white wire from front power strip to fuse holder


 


black wire connects left side of AC input to fuse, red wire connects right side of AC input to red wires on terminal strip


 


rear panel RCA ground buss


 


1st input pair from front selector switch, cut orange wire 1/4" than white and ground shield


 


orange to 1st input right, white to 1st input left, and shield to RCA ground buss


 


all 5 inputs from front selector to rear RCA jacks and ground buss


 


TAPE-IN and TAPE-OUT shielded cables connect to rear RCA jacks and ground buss


 


prep transformer wires for connection to PCB, green/blue pairs tightly twisted, cut about 1" longer than needed to route under PCB in next step




 


orange 6VAC, yellow HV, grey HV, brown 6VAC - connections from power transformer


 


connect outputs from master attenuator to inputs of PCB (orange, right;  white, left) and shield grounds



 

 TAPE IN and TAPE OUT connections are made with coax from front panel SOURCE-TAPE switch 

 OUTPUT 1 and OUTPUT 2 are bridged together with a 1K resistor, connected from C3 out on PCB, no 2nd pair of output caps (optional) 









 return back to SP14 main page 
  here are some photos to help you identify the parts to build the SP14 








 inquire about any other options or modifications you might want via email . . . .

      
send email to ROY at: info@tubes4hifi.com 
      












 tubes 4 hifi 


 "the path of least resistance is through a vacuum"