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Single Ended Triodes (SETs), the ultimate tube lovers dream.

RE:Actually, i had a circuit problem. But, your suggestion is good

If your circuit uses fixed bias why do you have a cathode resistor.

With the grid resistor feed by a negative bias supply the cathode should just be grounded.

BTW I read your other post and if you are going to use a LED in the cathode for cathode biasing you still need a proper amount of plate current and a proper amount of plate voltage.

You want to operate the tube somewhere that the tube is linear.

A 6sn7 with only 60 volts on the plate and only 2ma. (or so) is not a linear place.


I like 12-14ma 200 volts on the plate but that operating point is out of the question it you use a plate resistor.

I use a CCS plate load.

It makes everything easier and makes for a very linear stage with a lot of plate voltage swing (if you need a lot of swing, like in a driver stage).

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