testing ports for probes

[chokesrule]

Hi at 7:10 mins in this youtube video

KT88 vs EL34 vs 6L6 Substitution In Vacuum Tube Amplifier.wmv - YouTube

the guy has used some probe ports for fast easy testing. What are these ports called so I can buy some?Thanks Alan

 

[mickeymoose]

Google: 2mm tip jack. Here are some: Tip Jack | Electrical Connectors. E

 

[chokesrule]

brilliant ! thanks