20 Hz v.mp4Single wire good NO AUDIO.mp420240124 201400 1.mp4
2 - 12NO180T Time delay tube --- This is the correct time delay for the SR-2000 /P2000.
These delay tubes are the only 12NO180T 180 second 9 pin tubes made by Amperite. Amperite build them for us years ago. There were only 24 built. $70.00 each