There is nothing to suggest that Russell waws ever a trinitarian, at least during his Bible Student years. Barbour and Patton were both trinitarians. However volume 5 of Studies in the Scriptures has a refutation of the Trinity doctrine.
Russell believe and taught to diety of CHrist, after His resurrection, and even stated that he prayed to Jesus on occassion and said it was proper to worship Jesus. he believe it was Jesus who created ALL things. That it was Jesus who walked in the garden with Adam, that it was Jesus who spoke throughout the Old Testament as God's spokesman, that it was Jesus who visited Abraham with two other angels on their way to Sodom.
Somehow Jesus took a backseat.