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in combination with the attenuator's 23 contacting-points that can be changed within a range of 0 dB to -50 dB
it is designed with a rectification circuit with a ROHM high-speed switching diode and choke transformer for the high-voltage power supply and the 300B heater using DC ignition with a DC power supply
the full balanced connection (No
They are an ultimate upgrade for all those
oil charged for smoother operation
Boulder - 812 DAC Preamplifier armboard in combination with the attenuator'sThrough the worldwide success of the 866, Boulder has expanded the 800 series with the 812 DAC, Preamplifier, headphone amp. By applying the design philosophy from the 866, and over 35 years of experience designing DACs, preamps, and amplifier circuits, you get a device that has precision, top of the line performance. Plus the quality and reliability you would expect from a Boulder product, in a refined package. The 812 is Boulders first headphone
