SP9 octal preamp built by JFmy 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
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. . . . .
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