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Tubelab Discussion and support of Tubelab products, prototypes and experiments

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Old 15th April 2013, 11:08 AM   #51
RuiR is offline RuiR  Portugal
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Originally Posted by rknize View Post
Very simple test for a MOSFET. There are better ways using a small battery instead of the meter to charge the gate. Just Google it.

MOSFET testing

Since the resistor method is working, I am really confused about why your CCSs are failing.

It works now, at least for a full week

I have to thank you Russ for the help and patiente, the resistors test was essential to see it was a mosfet failure I order DN2540 ones and installed them. They are working.

I have now 260/270/280VDC (it depends wich valve i use) 12AT7 plate voltage and 2.2VDC cathode... the valve runs at 10mA. A little high but i don't have a more suitable resistors.

Thank you
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Old 15th April 2013, 06:46 PM   #52
rknize is offline rknize  United States
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I'm glad that you figured it out!
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