How to Tape in Mono with 2-track?

Pre recorded tapes 3 3/4 ips, stereo problem?

Playing a 4 track pre-recorded tape on a 2 track deck.

Ampex 601 Portable Analog Mono Reel to Reel Tube Tape Recorder Machine #34326

Where Do You Belong? Challenges in Sorting Open Reel Audio Tapes (Part One) – Media Digitization & Preservation Initiative Blog

I purchased this used off a few months ago. Aesthetically it is in great condition. Comes with power supply and tape (partially cut to make tape

NAGRA 4.2 (portable mono full track 6.35-mm (¼ inch) analogue audio tape recorder)

Analog Recording World - PRODIGY AUDIO RESOURCES

Reel-to-reel audio tape recording - Wikipedia

What cassette tapes are best/quietest? Are there mono tapes? - Gearspace

BTR 2 #GearThatMadeUs