L2 Signature Preamplifier

The L2 Signature Preamplifier is Vinnie Rossi’s new flagship design that creates an effortless connection between the listener and the music. Compatible with the most cherished of 4-pin directly heated triode (DHT) tube families, L2 delivers an unmatched listening experience with its exceptional resolution, tonality, and “reach out and touch the performer” sense of realism. Superb linearity and extra-wide bandwidth recover delicate nuances and provide incomparable texture, layering, and spaciousness. And when it comes to bass response, L2’s articulation of each and every note is phenomenal.

At the heart of the L2 Signature Preamplifier is Vinnie Rossi’s latest Class-A, ultra wide bandwidth, DHT topology powered by patented Belleson super-regulated, dual mono linear power supplies.  L2 exemplifies elegant simplicity and finesse in communicating all the emotion and passion in the music.

Each L2 Signature Preamplifier is meticulously hand-built and tested by Vinnie Rossi himself. Its no-compromise construction and use of the highest-quality components assure the listener of reliable performance for many years.

* Production of the L2 Signature Preamplifier, along with optional L2 Dac and L2 Phonostage modules (see tabs below) begins September 2018!

* Click on the tabs below to learn more.

* View the all new Vinnie Rossi L2 Signature Monoblocks >>

L2 Signature Preamplifier Features

  • Vinnie Rossi’s latest Class-A, ultra wide bandwidth directly heated triode (DHT) preamplifier design, compatible with: 2A3, 45, 300B, PX4, 101D, 205D, and SV811 DHT families with one-switch filament voltage selection.
  • Dual shielded power supplies with in-rush current limiting.
  • Dual-mono layout using multiple patented Belleson super regulators for ultra-quiet linear voltage regulation of the L&R triode B+, L&R triode filaments, and power to the (optional) L2 DAC and L2 Phonostage modules.
  • Discrete, 64-step resistor ladder volume control using Pickering England silent signal relays.
  • True active balanced (XLR) and single-ended (RCA) inputs and outputs.
  • Dual 12V Trigger output jacks with on/off control switch on front panel.
  • Internal, “DHT bypass mode” switches (Replaces DHT stage with a Class A JFET stage).
  • Internal front panel display & LED brightness controls.
  • Yamamoto solid Teflon UX-4 tube sockets.
  • Solid, precision CNC machined aluminum chassis and “bank vault,” ball bearing control knobs.
  • Mesh tube covers for added noise shielding and tube protection, with matching mesh ventilation on top panel.
  • Included tubes: EH300B Gold-Grid (matched pair).
  • Full-function aluminum remote control handset.
  • Designed and manufactured in the USA.
  • 10-year warranty.
  • Includes custom, military-grade hard travel case.
L2 Signature Preamplifier Specifications
Frequency Response
(with stock EH300B tubes):
2Hz – 500kHz (+/- 0.5dB)
0.5Hz – 950kHz (+/- 3dB)
Output Impedance (SE and BAL): < 100 ohms
Input Impedance (SE and BAL): Approx. 10K ohm
Voltage Gain: 8 dB (with stock EH300B tubes)
0dB (DHT Bypass Mode / Unity gain JFET buffer only)
SNR (with stock EH300B tubes):
SNR (DHT Bypass Mode):
-120dB (A-Weighted), SE IN/OUT
-140dB (A-Weighted), SE IN/OUT
12Vdc Trigger Outputs: 12V (+/- 0.1V), 200mA max (each) with on/off switch on front panel
THD+N (with stock EH300B tubes):
THD+N (DHT Bypass Mode):
Less than 0.5% (unweighted), SE IN/OUT
Less than 0.0006% (unweighted), SE IN/OUT
AC Input: Factory configured for 110-120Vac  -or-  220-240Vac (50/60Hz)
Volume Control:
Balance Control:
64 steps (approx. 1dB per step) from -∞ to +8dB
24 steps from L to R (approx. 1db per step)
Power Consumption (with stock
EH300B Gold Grid  tubes, L2 Dac and L2 Phonostage installed):
Approx. 65W
Protections: – Fused AC input
– MOV (AC input surge protection)
– Output short circuit protection
Dimensions (no tubes installed):
(with tubes and tube covers installed):
Approx. 14.5″ wide x 14.5″ deep x 5″ tall (368mm x 368mm x 127mm)
Approx. 14.5″ wide x 14.5″ deep x 8″ tall (368mm x 368mm x 203mm)
Weight:
Shipping Weight:
26.5 lbs (12 kg)
52 lbs (24 kg) including travel case

L2 DAC Features

  • Bit-perfect playback at sampling rates up to PCM 768kHz (16, 24, or 32 bit compatible), as well up to DSD512. Sample rates are viewable from front panel display.
  • Dual-mono design, with one flagship AKM AK44497EQ d/a chip per channel.
  • Fully discrete, pure Class-A JFET analog outputs stage design with cascode constant-current source biasing (no opamps).
  • On-board FPGA buffer and femto-reclocking circuitry negates effects of jitter. Isolated input stages.
  • ‘NOS’ (non-oversampling) filter mode with digital filter bypass, as well as a Minimal Phase digital filter mode (selected via the “FILTER” button on the L2 Remote).
  • Absolute polarity ‘normal’ / Absolute polarity ‘inverted’ modes (selected via the “PHASE” button on the L2 Remote).
  • Belleson Super-regulated voltage feed to numerous ultra-low noise, linear voltage regulators used throughout (for both digital and analog sections).
  • “Silent” mute ‘reed relays’ (*barely* an audible click from the board when changing tracks of a different sample rate).
  • Inputs: 1 USB, 1 Coax (75-ohm BNC, with included RCA adapter) and 1 TOSLINK (optical).
  • Connect up to three devices and switch between them via L2 front panel or the remote handset.
L2 DAC Specifications
Output Voltage: 2.0V rms
Output Impedance: < 100 ohms
SNR: > 115dB
Playback Bit Rates Accepted (PCM): 16, 24, 32
PCM Playback Windows PC: 44.1, 48, 88.2, 96, 176, 192, 352, 384, 705, and 768kHz – driver included.
Mac OSX: 44.1, 48, 88.2, 96, 176, 192, 352, 384, 705, and 768kHz – no driver required.
Sonore: 44.1, 48, 88.2, 96, 176, 192, 352, 384, 705, and 768kHz
DSD Playback Windows PC: DSD64, DSD128, DSD256, and DSD512 (both Native mode, and DoP) – driver included.
Mac OSX: DSD64, DSD128, DSD256 (DoP) – no driver required.
Sonore: DSD64, DSD128, DSD256, and DSD512 (both Native mode, and DoP)

L2 Phonostage Features

  • Inputs: 1 set of Moving Magnet (MM), 2 sets of Moving Coil (MC)
  • Built-in, on the fly MC remote adjustable cartridge loading (10 – 1000 ohms). Cartridge load setting viewable from L2 front panel display
  • Adjustable gain jumpers for MM and MC inputs
  • Belleson Super-Regulated split-supply voltage rails
  • Four low-noise and low distortion gain stages. Each stage has a nominal gain of 20dB, resulting in higher bandwidth per stage and lower phase shift across the audio band
  • Low output impedance design
  • DC coupled from input to output (no dc blocking capacitors added in series to the signal path)
  • DC Servo keeps output offset negligible
  • RIAA is designed to prevent internal overload by first attenuating treble, and then boosting bass
  • High accuracy resistors and capacitors used throughout
  • 4-layer PCB with separate ground planes for analog and digital (control circuitry)
  • Cardas Audio input jacks
  • Connect up to three tone arms and switch between them via L2 front panel or the remote handset
L2 Phonostage Specifications
MM Gain Settings: 40dB, 46dB
MC Gain Settings: 60dB, 66dB, 72dB
Output Impedance: < 100 ohms
Noise (3Vrms output, 1kHz): > 90dBV
THD (3Vrms output, 1kHz): < 0.002%
RIAA Accuracy (20 – 20kHz): +/- 0.5dB
Output DC Offset Voltage: < 2mV (servo controlled)