Purchased new by me in late 2014. Low hours, always kept in a smoke free, pet free environment. Equipped with Stillpoints OEM Universal Resonance Dampers, this preamplifier is in perfect working order and is mint cosmetically.
This unit is equipped with the optional phono stage as well as the optional moving coil step-up transformers.
Retail price with phono options is $13,000 USD.
David Berning products have universal power supplies and can be used anywhere in the world. In addition, this preamplifer can be run from a 12V battery supply.
Wire transfer preferred. Paypal adds fee.
From the Berning website:
Features and General Operation
A very unusual feature of the ZOTL PRE ONE is the incorporation of the patented Berning ZOTL technology into a preamplifier. The ZOTL technology has previously only been applied to power amplifiers to provide a properly impedance-matched tube output stage to the loudspeaker without using an output transformer. In the ZOTL PRE ONE, the ZOTL is used to provide an unusually robust output drive for a tube preamplifier that effectively overcomes interconnect cable parasitics. The output impedance is a very low 50 ohms without using feedback, and with a peak current drive of over 100 mA. This enables the ZOTL PRE ONE to be able to drive headphones. A headphone jack is provided on the back of the preamplifier for such use.
The high-level stage uses a balanced differential amplifier input section and a constant-current-loaded, single-ended ZOTL output second section. There are no coupling capacitors in the high-level stage, and dc offset cancellation at the output is done with a power supply servo that provides just the right voltage for the input section to precisely balance the output section. Hence the ZOTL PRE ONE is auto-biasing so that tubes can be changed without the need for manual biasing. The single-ended topology combined with a zero-feedback design yields distortion characteristics that are dominated by 2nd order harmonics and are considered to be more musical than other forms of distortion. The audio circuit board in the ZOTL PRE ONE is a special low-loss ceramic material and provides for this preamplifier having a more transparent sound with additional presence.