Need triode-connected EL34 grounded-grid curves

Quince · Mar 26, 2007

Haven't been able to find curves for a triode-connected, cathode-driven EL34 anywhere. I need plate voltage vs cathode voltage for constant current operation. Help is greatly appreciated. If the data doesn't exist, how can I derive it from other curves?

NewYorkDave · Mar 27, 2007

I doubt such curves were ever published.

This is a grounded-grid amplifier with a constant-current plate load? Or a current source/driver amplifier in the cathode circuit? If you provide some detail about the application, that would be helpful.

I suggest posting this on the Drawing Board. This is unlikely to get much response here in clone-ville.

Larrchild · Mar 27, 2007

You could build a test jig and graph them slowly and manually on a few tubes for the feel of the curves.

Quince · Mar 27, 2007

Is it possible to use an oscilloscope's XY graphing and feed I guess a triangular signal

Larrchild · Mar 27, 2007

Yeah, use the sweep to drive a dc amp for drive signal and feed the scope vertical from the current sensing resistor.

But you will have to calibrate the vertical in milliamps

or try one of these:
http://www.arrl.org/qex/2006/07/qx7steber.pdf

PC based curve tracing.

Quince · Mar 27, 2007

What do you mean calibrate the vertical in milliamps? I'm concerned with output voltage, not current (the current is held constant by a CCS loading the tube).

Larrchild · Mar 27, 2007

Oh, well most people associate load lines with their current levels (except pentodes).
nevermind, I'm sure you will figure it out.

Need triode-connected EL34 grounded-grid curves

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