This reel-to-reel tape recorder seems to only have 2 heads, could

Reel-to-Reel, Cassette and Digital Audio Tape

Old Reel-to-Reel Tape Recorders --- Do You Have One?

Analog Tape Recording Basics

reel-to-reel: adjusting heads or something else?

REEL TO REEL TAPE RECORDER

2-head Reel to Reel?

Kostas Metaxas T-RX Tape Deck - The Absolute Sound

Reel to Reel: Buy, Play & Optimize the Tape Experience - RX Reels

REEL TO REEL TAPE RECORDER

Old Reel-to-Reel Tape Recorders --- Do You Have One?