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Tube DIY Asylum Do It Yourself (DIY) paradise for tube and SET project builders. |
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Tube DIY Asylum Do It Yourself (DIY) paradise for tube and SET project builders. |
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In Reply to: multimeter is reading very high plate current posted by banpuku on February 20, 2017 at 11:44:50:
Install a 10r resistor between the diode and ground. Measure the voltage and use ohm's law to determine the current.
Draw out the operating point on the plate curves and you will see that there is no operating point that conforms to your schematic. A plate supply of 325V with a load of 22k laid out on the plate curves shows a plate voltage of about 90V and plate current of about 11mA when the bias point is -2V. You will only have about 40V peak to drive the 2A3 and you will likely need about 60V so you may want to use two LEDs to bias the ECC99 at -4V so as to give you much more voltage swing. -4V bias should give you a plate voltage of 125V and about 9mA plate current with a voltage swing of about 80 V peak.
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Follow Ups
- RE: multimeter is reading very high plate current - Palustris 12:09:41 02/20/17 (1)
- RE: multimeter is reading very high plate current - banpuku 12:54:41 02/20/17 (0)
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