If it is from 1994 you have what is known as a WT800*A*
The amplifier is only bridgeable to 8ohms (newer versions B & C dated 4/05 to current, can do 4ohms bridged)
The A model that you have was made by the founder, well before all the buyout and disasters that happened later on in the companies life.
Valenti & G&L basses
Eden Electronics #28, Yorkville/Traynor #166