Adjustable B+ and Cathode Current linestage - diyAudio
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Old 29th July 2009, 05:53 PM   #1
Brit01 is offline Brit01  United Kingdom
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Default Adjustable B+ and Cathode Current linestage

Just built a linestage (actually a CF buffer), and have been trying with different 9 pin tubes.

Now it occurred to me that I could incorporate a variable resistor in the power supply to vary the B+ and also a variable resistor for the cathode.
Put in 2 meters, one to measure the current in mA and another to measure the B+.

So when I swap tubes or simply tune the current to find sweet spots, I can increase or decrease the B+ to balance with the cathode resistor.

Of course all within limits of the rectifier and tranny current.

Has anyone done this before? Don't see why it wouldn't work well.
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Old 29th July 2009, 06:01 PM   #2
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This thread may help you a lot:

Loading on gyrator you can forget about anode voltage adjustments. Also, you get the best possible linearity from your tube, compared to a plain resistive load.
The Devil is not so terrible as his math model is!
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Old 30th July 2009, 12:12 PM   #3
Brit01 is offline Brit01  United Kingdom
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Thks Wavebourn. Have to have a read of that when I get a bit of time. Looks interesting.
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