In addition to regular cleaning, tape heads need to be demagnetized. Residual magnetism accumulates over time causing loss of fidelity and
Deluxe Cleaning Kit
On the Reels: Challenges in Digitizing Open Reel Audio Tape - Bitstreams: The Digital Collections Blog
Dokorder
SOUNDFAN - Reel to reel recorders and tapes - Servicing
Q. How do I maintain my tape machine?
AKAI GX-400D PRO 26 cm tape deck 1975 - Catawiki
Teac Tape Tension/Skewing problems, X series, dual capstan models
Service Archives - Reel-to-Reel Tech
Reel-to-Reel Head and Tape Path Cleaning
Tape head - Wikipedia
Sony Reel to Reel - Summary
Teac/Tascam tape deck - Summary
Reel-to-Reel Archives - Reel-to-Reel Tech
Teac/Tascam stuck pinch roller repair for all models
For discussion about Reel to Reel players and tapes.