Repairing a Kicker 06 ZX650.4 I just got in, stuck in protect I guess, first thing i do with amps like this is clean them up, bottom was corroded like it sat in salt water, main power trace starting to lift from board, I clean it all up, reattach trade edge that was lifting, amp powers up perfect, waves look great etc, only thing that was off while probing, etc was the JFETs J110 in Q100, Q200, Q300, & Q400.
Spec resistance on them between Gate and Drain is 18ohms, each of these is reading between 8-9ohms, which is spec for J108, J109 is 12phms and J110 is 18ohms.
Amp seems to run perfect, haven’t benched/dyno’d it yet but can’t help but think proper spec JFETs would help that much more, problem is I can’t find them anywhere, I’m looking for exact replacements tho and don’t know of any alternatives.
Anyone know the purpose of these JFETs, and of spec JFETs are advised or if the 8-9ohm is fine, that seems like a huge discrepancy to me, half the ohmage it should be. I’d just replace if I could find them, but I can’t and amp “seems” to run perfect as is.
any advice greatly appreciated 🖖🏼
Spec resistance on them between Gate and Drain is 18ohms, each of these is reading between 8-9ohms, which is spec for J108, J109 is 12phms and J110 is 18ohms.
Amp seems to run perfect, haven’t benched/dyno’d it yet but can’t help but think proper spec JFETs would help that much more, problem is I can’t find them anywhere, I’m looking for exact replacements tho and don’t know of any alternatives.
Anyone know the purpose of these JFETs, and of spec JFETs are advised or if the 8-9ohm is fine, that seems like a huge discrepancy to me, half the ohmage it should be. I’d just replace if I could find them, but I can’t and amp “seems” to run perfect as is.
any advice greatly appreciated 🖖🏼