tubes 4 hifi
 "the path of least resistance is through a vacuum"

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SP9 octal preamp built by JF

my customer JF wanted the SP9 tone control preamp with large octal tubes,
so the SP9 octal version was created, when he finished he sent me the preamp to checkout and test



front view



rear view



inside view and front panel (customer supplied selector switch)



inside view and rear panel, with optional input relay switcher



balance and volume controls, left photo is before adding missing ground link shown on right above



overall view from above


 
closeup of power switch and LED, nicely done!             closeup of AC input, nicely done!



underside wiring of PCB



side view during test

here's another custom SP9 octal preamp built for a customer. . . . .




send us email at: info@tubes4hifi.com


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 tubes 4 hifi
 "the path of least resistance is through a vacuum"