I use two SB 400 for my weddings ..no problems 10 + flashes at 2 fps no problem even though they are 15 years old . In about 2004 I bought my daugher a SB400 and recently borrowed it . 2 flashes then its finished ...So dont leave your flash unused for 10+ years . Am sure the capacitor has deteriorated but can I buy one ? Fire up that spare flash at least every 6 months and test if you buy second hand . PS remember when you turn on your flash the iso goes up 4x so by setting base iso to 200 you get 800 so the SB 400 has loads of power ..but you all know that ....
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