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Old 12th October 2007, 08:52 AM   #1
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Default 12/24 volt tubes

are the low voltage tubes mainly good for unity gain or low gain in a preamp? i haven't found any amps using one in the output stage e.g. headphone amp.

a forum search says there's no substitute for high voltage.
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Old 12th October 2007, 03:55 PM   #2
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6GM8 and 6DJ8 are commonly used in low voltage tube amplifier circuits, although for a headphone amplifier 24V is probably below the lower limit even with these tubes.

And yes there is no substitute for higher voltages.
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Old 12th October 2007, 04:13 PM   #3
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... maybe this one fits for you ... you can take an old pc power supply to feed them ...

Click the image to open in full size.

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DC @ Headphone 2.5 mA and 4 mW power loss. - passable
Filament current 3.8V @ 600mA

URL in German
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