Fluid leaks (if applicable)
1 kHz sine @ 0 dBu input, 8Ω dummy load, volume at 12 o'clock. Beta 3 U15a Service Manual
| Component | Frequency | Action | | :--- | :--- | :--- | | | First 20 hours, then every 100 hrs | Change oil. Check level daily before use. | | Engine Oil | First 5 hours, then every 50 hrs | Change engine oil (SAE 10W-30). | | Air Filter | Every 50 hours | Clean; replace if dirty. | | Water Inlet Filter | Daily | Inspect and clean debris. | | Spark Plug | Every 100 hours | Clean gap (usually 0.7-0.8mm) or replace. | Fluid leaks (if applicable) 1 kHz sine @