LAMM INDUSTRIES LL2.1 PREAMPLIFIER
LINE LEVEL TUBE STEREO PREAMPLIFIER. SOLD AS ONE UNIT.
The Threshold of Excellence in Sound Reproduction
As the next generation of the original LL2 LAMM vacuum tube preamplifiers, a main distinction of the LL2.1 is its almost inaudible sonic signature. When connected to the right LAMM amplifiers, it recreates a three-dimensional soundstage in the comfort of your own home.
LL2.1 Regular & Deluxe: Line Level Tube Preamplifier
Design Elements
The LL2.1 features a topology that brings out the most natural sound performance in the audio path, employing a pure class A operation from input to output; all stages are single-ended. The preamplifier’s audibly neutral power supply features a full-wave vacuum rectifier. This rectifier, together with a choke-containing filter, helps reduce the hum and buzz to almost negligible levels and ensures a variety of dynamic range without coloration.
Other features include 3 inputs; 1 tape loop; 2 sets of outputs; front panel muting switch; attenuator for gain reduction by 15 dB; built-in remote on/off for LAMM power amplifiers; protection circuitry coupled with automatic mute at turn on/off.
Components
Each preamplifier is hand-crafted with the highest quality materials, including military grade low noise Dale metal film resistors; Noble potentiometers; Electrocube and Roederstein film capacitors; high frequency switching grade Cornell Dubilier electrolytic capacitors; and specially selected long life vacuum tubes. The LL2.1 features a custom-designed power transformer.
The LL2.1 is available in two versions: standard and deluxe, both of which utilize identical chassis, PC-board and parts.
In the deluxe version, the power supply energy storage is approximately twice that of the standard version (four identical light-blue capacitors next to the choke; only two of these are installed in the regular version — see first detail image insert).
Also, in the deluxe version, all film capacitors in critical pathways are situated next to polystyrene capacitors of the highest quality (see: yellow capacitors on two images — right and below).
Features
Unique topology: Brings out the most natural sound performance in the audio path
Standard and deluxe models available: Deluxe model offers approximately twice the power supply energy storage as the standard model. Additionally in the deluxe model, all film capacitors in critical paths are paralleled by polystyrene capacitors of the highest available quality
Pure Class A vacuum tube design: All stages are single-ended.
Drives any cable and any reasonable real world load: High-current drive capability, in combination with unique single-ended Class A circuitry, allow the LL 2.1 to maintain its practically inaudible sonic signature.
Technical Specs
Pure class A operation: All stages are single-ended
Dual-mono preamplifier with 3 inputs and 1 tape loop; 2 sets of single-ended outputs: Connected in parallel
Two 12AU7A/ECC82 tubes
Two 6922/ECC88 tubes
One 6X4/6202 tube
Audibly neutral power supply: Featuring a full-wave VACUUM rectifier with a choke-containing filter, and one solid-state low-voltage analogue regulator used as the heater supply
Attenuator for gain reduction by 15 dB
1.5-400,000 Hz (-3dB): Frequency response
Remote on/off switch: For Lamm M1.2 Reference, M2.2, ML2.2 and ML3 Signature amplifiers
Operates on all world AC line voltages
Dimensions
Height: 4.5" (11.43cm)
Width: 19" (48.26cm)
Depth: 13.875" (35.25cm) (add 1.375 inches for front handles)
Weight: 20lbs (9.1kg)
More information at https://www.lammindustries.com/products/ll21/