What is the part number of this vacuum tube?

This 6F2/ECF82 vacuum tube is a direct replacement for the Dayton Audio HTA100BT Hybrid Stereo Tube Amplifier shorter (outer) tubes.

6F2/ECF82 Vacuum Tube

This 6K4 vacuum tube is a direct replacement for the Dayton Audio HTA200 Hybrid Stereo Tube Amplifier taller (front) tubes.

6K4 Vacuum Tube

Vacuum Tube Computer Part 34: Paper Tape Interface and Clock

ENGL Matched Vacuum Tubes - 6L6-4 (Quartet) - ENGL Amplification

Tube-vacuum, UpperTube-vacuum, Upper

Toro Tube-vacuum, Upper Part # 108-8969

Lot of 5X. Vintage 6U7G Loose Glass Vacuum Tubes. Untested Mixed

Electron tube Vacuum Tubes, Cathode Rays, & Applications

File:Vacuum tubes octal, miniature.agr.jpg - Wikipedia

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Parts Express 8-Pin Vacuum Tube Socket Belton Micalex