NOTE: The information on this page is not
a current modification option for the LA-4. It is simply to demonstrate
the result of expermienting with Opto Device Speed.
Figures-1a and -1b (below) show an LA-4's reponse
time when outfitted with the "stock" opto which is beautifully slow or
with a high speed opto, which is actually too fast. One of my Silver
LA-4 experiments has been to add a mic input transformer, phantom power
and a preamp. It's very cool but a bit tedious. There are two
unused opamps in the LA-4, the mod turns them into an improved version
of the Trident Series 80 preamp.
Related but completely different is a very extensive series
of mods for the Alesis 3630 that should be available on Video in 2003.
Meanwhile, here are the two Opto-Response pix...