ArtemF
New Head-Fier
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- May 30, 2010
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most probably you either short-cut the mosfets or fried them resulting in a complete
open mosfet. You can check if the filaments are still operable by testing the resistance
between the corresponding pins (#3 and #4). For the future tests you can first use
a powerful resistor instead of the tube filament.The working point for mosfet is set
by R2 and R4 resistors so the circuit will not notice the absence of the tubes.
When there is no smoke/sparks
and the voltages in the key points seem to be
reasonable then you can try it with the tube.
open mosfet. You can check if the filaments are still operable by testing the resistance
between the corresponding pins (#3 and #4). For the future tests you can first use
a powerful resistor instead of the tube filament.The working point for mosfet is set
by R2 and R4 resistors so the circuit will not notice the absence of the tubes.
When there is no smoke/sparks
reasonable then you can try it with the tube.