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6N3 Tube Preamp with DC-DC converter
6N3 Tube Preamp with DC-DC converter
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Old 14th November 2018, 06:49 AM   #151
Hugh Jazz is offline Hugh Jazz  Taiwan
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What value of current drain? A specific fet would be helpful : -) I've got some constant current diodes but I doubt I have the right value. Let me know which one you use and i'll order it.

There are many things to try, but for now I'm really focused on paralleling... I reckon 100R on the output of each will make load sharing work but will limit the benefits. I'm hoping to optimise the value of R.
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Last edited by Hugh Jazz; 14th November 2018 at 06:54 AM.
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Old 14th November 2018, 07:36 PM   #152
Koifarm is offline Koifarm  Netherlands
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Parallel 6n3 for headphone amp. But no low anode voltage(200v).
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Old 14th November 2018, 09:34 PM   #153
Wavebourn is offline Wavebourn  United States
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6N3 Tube Preamp with DC-DC converter
Quote:
Originally Posted by Koifarm View Post
Parallel 6n3 for headphone amp. But no low anode voltage(200v).
Yes, as cathode followers with 200V B+ source they are fine.
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Old 14th November 2018, 09:48 PM   #154
Hugh Jazz is offline Hugh Jazz  Taiwan
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Quote:
Originally Posted by Koifarm View Post
Parallel 6n3 for headphone amp. But no low anode voltage(200v).
And super E caps - nice :-) Thank you so much for sharing that!
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Last edited by Hugh Jazz; 14th November 2018 at 09:58 PM.
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Old Today, 10:14 AM   #155
Hugh Jazz is offline Hugh Jazz  Taiwan
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Does anyone know if the two channels should measure roughly the same if they have the same power supply, same resistor values etc.? In other words, should there be a considerable difference between two channels of the same tube? I have two of these buffers, which is four channels, and for both buffers, the voltages across the resistors at the cathode are significantly different. For example, across the 470R connected to the cathode, the two left channels on each buffer both show 0.8V and the right channels are 0.2V and 0.35V. Is this a common problem with made in China tubes?
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