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Posts by Donald North

In my experience a proper silver transformer provides unmatched transparency, allowing you to clearly hear all of the nuances and layering within a recording. In order for you to hear its ability, everything else within the amplifier (power supply, coupling, and cathode bypass capacitors, resistors) needs be of the same calibre otherwise you won't hear the full benefit. I experienced this firsthand while working on a phono stage. Once you have an amplifier which is built...
A Silver Stellaris features silver-wound Audio Note input and output transformers, silver foil coupling capacitors, and silver internal wiring. Chassis will be blue.
A stage is an active stage of amplification, which are then cascaded. A tube gain stage can be a simple cathode-biased triode or SRPP or cascode or mu-follower, as examples, and can consist of a single tube section or multiple tube sections or hybrids (tube & solid state). The Stratus and Stellaris are 2-stage amplifiers: The first gain stage is provided by the 6N1P; the second stage is provided by the 2A3. How these 2 stages are coupled (direct, capacitor, transformer)...
Hopefully sooner. I may be able to build the first one in 2-3 months.
You need to adjust the hum nulling potentiometers each time you swap 2A3s. With no music playing, set the volume control to 0 and use your most sensitive headphones. Carefully listen and adjust until it is inaudible.When using TRS headphones the -6dB setting changes the secondary grounding from the - end to the center tap, thus reducing the output voltage by one half or 6dB. Output impedance is also reduced from 8 to 3 ohms. This settings is useful for low impedance...
A head-fier recently brought the KEF Muo to our office to compare to the Turbo X and S. When listened individually I was surprised to find that the Muo operates as a mono speaker. They have some explanation for this on their website. You need two for stereo.
Right now it is around 7-8 months.
They're Switchcraft D3F and D4F. You can order them through Mouser.com
Think of the Stratus as an integrated amplifier for headphones. The preamp duty is handled within the amplifier by the 6N1P. Now if you were to listen to vinyl through the Stratus, then you would need an external phono stage preamp.
Bypassing the internal volume control and using an external active preamp is not a good idea, in my opinion and experience. You will be adding more gain to the signal path, when there is already plenty with most sources and reducing the usable range of the volume control before it is too loud with dynamic headphones. You will also be adding noise. Of course you are welcome to try by turning up the Stratus volume control to maximum, thereby effectively taking it out of the...
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