Testing: Difference between revisions
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[[File:Filament_voltage.jpg|500px|thumb|left]] |
[[File:Filament_voltage.jpg|500px|thumb|left|Reasonable correlation between panel-reading and at-the-socket measurement]] |
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I clipped some test-leads right onto the tube-socket, in order to measure and adjust filament-voltage accurately. Eimac specifies 6.0 +/-5%, so that's what I gave it. |
I clipped some test-leads right onto the tube-socket, in order to measure and adjust filament-voltage accurately. Eimac specifies 6.0 +/-5%, so that's what I gave it. |
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Revision as of 21:39, 29 June 2021
120V Initial Testing
- I installed the original 4CX1000A tube which came in my amplifier. Only the 3.2A fuse was installed, and I applied power!
- The meters illuminated; after the time-delay relay closed, the dials also illuminated. The "ON / OFF" switch functioned.
- Opening either the top-lid or the front-panel removed the dial-illumination, and prevented operation of the "ON / OFF" switch.
- I tested the Thermal Overload switch K102 by moving it out of, and back into the airstream - it works, and disables the "ON / OFF" switch when there is no airflow over the sensor.
The Safety and Control seem to work. The Bias and Filament adjustments work.
I clipped some test-leads right onto the tube-socket, in order to measure and adjust filament-voltage accurately. Eimac specifies 6.0 +/-5%, so that's what I gave it. The panel-meter actually reads the incoming 115VAC supply, using that as a proxy for the actual filament voltage - you can see this does a pretty good job.