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Tube DIY Asylum Do It Yourself (DIY) paradise for tube and SET project builders. |
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Tube DIY Asylum Do It Yourself (DIY) paradise for tube and SET project builders. |
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In Reply to: Attempting a simple 12AU7 preamp design. posted by gavinhaley on April 15, 2016 at 17:01:00:
If all the 12AU7s are on a common winding, it's probably best to bias that winding halfway between the cathodes. Hopefully that's around 1/4 of the HV supply voltage, for best headroom.
If there are two heater windings available, then one can supply the voltage amp, and the other the cathode follower; they can then be biased separately.
For a preamp like this, linearity is not really an issue, since the output voltage has really enormous headroom. Using current sources greatly improves the circuit linearity, as well.
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Follow Ups
- RE: Attempting a simple 12AU7 preamp design. - Paul Joppa 20:08:28 04/15/16 (5)
- RE: Attempting a simple 12AU7 preamp design. - gavinhaley 20:21:10 04/15/16 (4)
- RE: Attempting a simple 12AU7 preamp design. - Paul Joppa 21:34:50 04/15/16 (3)
- RE: Attempting a simple 12AU7 preamp design. - Michael Samra 22:44:29 04/15/16 (2)
- RE: Attempting a simple 12AU7 preamp design. - Paul Joppa 10:03:05 04/16/16 (1)
- RE: Attempting a simple 12AU7 preamp design. - Michael Samra 10:31:44 04/16/16 (0)
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