right attenuator (red wire), master attenuator (shielded coax out), left attenuator (green wire) 

start with center terminals of master attenuator first, easier to wire the outside terminals afterwards 

inputs to right and left attenuators shown in next photo



 

right and left outputs of TAPE-SOURCE switch (center terminals of switch) run to inputs of right and left attenuators



 

red wire is RIGHT output of selector switch to bottom terminal of SOURCE-TAPE switch 

green wire is LEFT output of selector switch to bottom terminal of SOURCE-TAPE switch



 

top terminals of SOURCE-TAPE switch are to TAPE-IN on rear panel (to be connected later)

5 inputs to selector switch are wired (connected to rear panel RCAs later)


c
 

front panel wiring all done




 

transformer AC connections to terminal strip 


* 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





 

power transformer wiring to PCB
orange wire 6VAC - yellow wire HV - grey wire HV - brown wire 6VAC






 

all wiring done except for rear RCA jacks




 







 


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




 


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








 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 
      












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