- Joined
- Nov 18, 2004
- Messages
- 23,992
- Reaction score
- 4,014
- Points
- 113
- Age
- 69
- My Satellite Setup
- Has gone to a good home elsewhere
- My Location
- Blackburn, Lancashire
Those valves would be antiques nowTone (pure), and speech audiometry.
Audiology calibration, I used to set up the equipment, but it was over 30 years ago.