Ok. Let’s try this again…RCA 9TC240 Alignment

[Penthode]

On top of the marker are my wideband HP 403B AC Voltmeter and my HP 200D Generator. I used them for various testing. Most recently for audio distortion measurements in conjunctio with and HP 331A Distortion Meter. The 403B was locally $20, the 200D was free and the 331A was $40.

Attached is your photo with the connections.