The output jack on a T-40 should be on the bottom edge of the body. Several parts suppliers (including Peavey) have the barrel jack needed. Double check your connections to make sure they are solid.
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Tony
ITOC #05-00013
4 T-60s, T-63, T-15, Generation Standard, Hydra, Mantis LT, Milestone, Mystic, Odyssey, Patriot, Patriot tremolo, Predator, Raptor, Razer, Reactor, 3 Rockmasters, Tracer, Backstage, Bandit, VSS 20, Vypyr 30, Vypyr VIP-1.