Reverb tanks with a 4 as the first digit have two long springs
Sourced directly from the same factory that is the major producer of reverb tanks in the world, we bring you our own brand MOX. Identical in construction and materals to MOD tanks. Ther feature adjustbal grounding links. The short tanks can be mounted in any orientation whereas the 4 and 9 series, having longer and heavier springs, require adjusement of the tray suspension springs if you wish to mount other than specified.