Description

The Preamp – Preamplifier

The starting point for our new preamplifier was the development of a larger and mechanically more stable housing. This larger, resonance-optimized and thermally improved housing made it possible to realize new sophisticated circuits and to significantly optimize existing ones. The circuits are now much better decoupled from mechanical and acoustical interferences. The perfect thermal balance is reducing the temperature inside The Preamp quite a lot. The components are not strained by temperature anymore and the inherent noise of the components is reduced.

An essential principle of The Preamp is a two stage amplifier concept. The first amplifier stage is an input and a symmetry amplifier as well. The input signal is amplified and converted into a balanced signal in only one discrete amplifier stage. This means extremely short signal paths and fewer components which could affect the signal. Due to the balanced design the amplifier is much more protected against interference injections and the bandwidth is much more extended because there in only one amplifier stage involved.
The output stage is the second amplifier stage. This stage doesn`t have any voltage gain but is a pure impedance converter with very high current reserves. The output stage of The Preamp is of course fully balanced, double mono and four tubes of NOS PCC88 are used for each channel. (these strictly selected tubes are particularly linear and have a very high bandwidth). This guarantees the lowest possible distortion and a low output impedance.

The signal path is extremely short. Both amplifier channels are perfectly decoupled from the housing and mounted on its own low resonance frequency tuned sub-frame. This protects the amplifier stages against interferences from outside such as micro phonic or mechanical resonances. The ten tubes of the input stage are selected with big effort and then selected in pairs. The input stage is typically EINSTEIN, absolutely linear phase with an extreme bandwidth. This guarantees an ultrafast and unadulterated signal processing. To keep all tubes in their optimum operating points and to balance losses because of high operating hours, EINSTEIN has designed a sophisticated circuit which has been set up directly at the input tubes.

Specifications

The Preamp –

Technical data

Signal to Noise Ration: typ. 100 db
Distortion @ 1 kHz: < 0.01%
Output Voltage: bal. 2.5 Volt to 100 Ohm
max. Input Voltage: 7 Volt
Output Impedance: 50 Ohm
Bandwidth: 7 Hz untill 400 kHz
Channel Separation: > 98 db
Weight: 20 kg
Dimensions (H x L x D): 20 cm x 43 cm x 41 cm

 

Reviews

It doesn’t take a moroon to appreciate the audacity of naming a company after Albert Einstein, the iconic science and math whiz. Clearly, company founder and owner Volker Bohlmeier knew what he was doing—this German brand of boutique electronics has enjoyed worldwide critical and marketplace success since its founding more than 20 years ago.