Nagra Jazz line preamplifier Specifications

Sidebar 1: Specifications

Description: Tubed line preamplifier. Tube complement: two 12AX7, one 12AT7. Frequency response: 10Hz–50kHz, +0/–0.5dB. Input impedance: >75k ohms. Output impedance: 50 ohms. Signal/noise ratio (ref. 1V): 105dB (ASA-A weighting). Dynamic range: >112dB, gain at +12dB. Total harmonic distortion: <0.02% 1V RMS, gain at 0dB. Channel separation: >78dB.
Dimensions: 12" (310mm) W by 3" (75mm) H by 10" (255mm) D. Weight 7 lbs (3.2kg).
Serial number of unit reviewed: 55025166156025.
Price: $12,250. Approximate number of dealers: 10.
Manufacturer: Audio Technology Switzerland SA, 30A, ch. de l'Orio, 1032 Romanel-sur-Lausanne, Switzerland. Tel: (41) 021-643-72-40. Fax: (41) 021-641-75-32. US distributor: Audio Technology Switzerland (USA) Inc., 450 W. Main Street, Suite B-4, Gallatin, TN 37066. Tel: (615) 451-4168. Fax: (615) 451-4175. Web:

Audio Technology Switzerland SA
US distributor: Audio Technology Switzerland (USA) Inc.
450 W. Main Street, Suite B-4
Gallatin, TN 37066
(615) 451-4168

Et Quelle's picture

Marillyn Crispell CD is a nice addition to a jazz collection. Too bad I will never hear it on the Nagra Jazz. A nice looking amp; it's from Switzerland!!

vince's picture


Looks like a very nice component.  Nagra gear always makes my heart pump.  Great sounding too, going by the review.

I am confused.  The review indicates that the input is differential, but later goes on to say that an optional transformer is required for differential.  If the amplifier is configured to do balanced (differential), why do we need a transformer to utilze this?

"If I had wandered inside, I would have discovered a 12AX7 dual-triode tube, one per channel configured in differential topology..."

"The Jazz's suite of inputs consists of one pair balanced (if the optional input transformers are fitted, otherwise this input is single-ended)..."

Any explanation?