Indeed in measurements there were more hum than signal! So I switched to the Raytheon 6SN7 which I had from review of Schiit Saga. There was massive amount of hum both audibly and in measurements. I put one in there randomly and boy, was that a mistake. The owner had given me a few tubes for the first stage (6SN7). Let's get into the measurements and see how she does. There are a set of RCA outputs in addition to inputs so you can use the unit as a pre-amplifier if you like. The volume control is damped and a bit stiff but otherwise fine. Until then, I would make sure to not touch the chassis any more than you have to and only use one hand if possible.įit and finish is OK but you probably noticed the crooked power switch. I will be opening the unit later to see how it is inside. The big transformer here is for the power supply. The drawbacks depend on the design with the most common one being high output impedance. The benefit is supposed to be getting rid of nonlinearities of the transformer.
This is most often done with a transformer but in OTL designs, other methods are used. A tube amplifier needs to block high voltage DC from going out of the unit and also reduce the rather high output impedance of tubes. The configuration is OTL meaning Output-Transformer-Less. In DarkVoice 336SE, the signal path is all tube. That allows the output impedance to be as low as solid state amplifier yet give you the "benefits" of tubes, whatever they may be. Up to now we have tested hybrid tube headphone amplifiers that use tubes as the first stage but drive the headphones using transistors.
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