Castanet Headphone Amplifier Kit Manual
12
4 Testing & Installation
Testing
Double-check all of your work before applying power. Always wear safety glasses.
Look to make sure there are no solder balls, wire shards, loose items, or backward
components.
Install power cord. Apply power and watch for smoke. All LEDs should light up
immediately.
Measure heater voltage. It should be about 6.3Vac.
Measure B+. It should overshoot to about 150Vdc on power up, and then drop to
100Vdc after the 6H30 warms up.
Measure plate voltages. They should be approximately 92Vdc.
Measure cathode voltages. Approximately 4.2Vdc.
If the above checks out, then everything is operating properly at bias. If possible, add a
line level audio signal and check outputs on oscilloscope.
Power down. Wait a minute until removing power cord (proper bleeding of
supply capacitors).
Remove tube.
Mount assembly to bottom cover.
Mount top cover.
Re-install tube.
Your Castanet is now completed and ready for use.
