| What tube to use. - Click HERE for Original Thread |
| aurche |
I would like to build an headphone amplifier. The concept that i have made up is: OTL, Ultra Fast Diode Rectifier, Relatively low voltage, One Tube channel. What tube would you suggest i use?
And mind that the output impedance must be 50 or below! |
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| aurche |
| I was thinking 6S45P |
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| azazello |
| Yours headfones - low impedance /30 - 60 ohm/ or higt /200-300-500 ohm/?? It's very important!!! |
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| Akita |
| You can try 6as7. Its a nice tube for headphone amp too |
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| azazello |
6H30C - /Russia/ lake pre-amp, and 6H13C/Russia/ lake output
kathod. |
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| Gordy |
6S45 = 6C45 ?
Simple 6C45 power amp here:
http://www.paeng-design.com/devices_frame.htm
(in section: High ó tubes, Part 111)
Adapt to headphone by changing transformer ratio?
6C45 datasheet suggests limited input swing / bias, so will need attenuator at input if using 2V output from CD player.
Anecdotal evidence suggests 6C45 oscillates easily, so use well regulated supply and grid stopper resistors.
More info here:
http://www.vt52.com/info/measure/6s45/6s45.html
...and also in projects section of the site.
Good luck. : ) |
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| regal |
| I don't think you wil be able to power 55 ohm headphones with a single tube OTL. You will need push-pull with feedback to be output transformerless. Or you could use a solid state buffer with a single tube gain stage. |
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