I recently build a hybrid headphone amp from NP-100v12: DIY 12AU7 (ECC82) Tube / IRF510 MOSFET Headphone Amplifier .
Currently, I am combating a hissing noise that increase in volume as I turn the pot. I have built a LM317 regulator for it. I also have used an SMPS, but still have noise. The difference is, using the linear PSU the noise is a hissing noise which increase in volume as I turn my pot, while using the SMPS the noise is a constant humming noise.
The tubes in it is a 12AT7, which based on the original thread is compatible for this amp. What could be the problem in my build? Your help is appreciated
Also, can I use this amp as a preamp/buffer? If so, do I need to change something? Thanks!
Currently, I am combating a hissing noise that increase in volume as I turn the pot. I have built a LM317 regulator for it. I also have used an SMPS, but still have noise. The difference is, using the linear PSU the noise is a hissing noise which increase in volume as I turn my pot, while using the SMPS the noise is a constant humming noise.
The tubes in it is a 12AT7, which based on the original thread is compatible for this amp. What could be the problem in my build? Your help is appreciated
Also, can I use this amp as a preamp/buffer? If so, do I need to change something? Thanks!
> hissing noise that increase in volume as I turn the pot
Then it may be coming from *before* the pot.
Or through thin air, if it is not in a metal box.
A 12AU7 would have less of these noises than a 12AT7.
Or through the power supply wires since there is NO power filtering shown on the amplifier plan.
Then it may be coming from *before* the pot.
Or through thin air, if it is not in a metal box.
A 12AU7 would have less of these noises than a 12AT7.
Or through the power supply wires since there is NO power filtering shown on the amplifier plan.
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