Category Archives: Pre-Amplifiers

Masterpiece Pre-amplifier

Masterpiece Edition pre-amplifier

Designed around the MV2 Pre-amplifier but taken to a completely new level in terms of component specification, vacuum tube choice and internal wiring to give an even better sense of musical involvement and resolution.

The Masterpiece edition Pre-amplifier has an extremely simple and pure signal path with only 1  output capacitor and 1 shunt resistor on the Khuzmo stepped attenuator which have been replaced with the incredible V-cap CuTF reference capacitor and a Charcroft Z foil resistor. This along with 5N solid silver and FEP fluoropolymer signal wiring gives this Pre-amplifier added  realism and an even better 3D soundstage capable of competing with the very best equipment in the world.

The choice of Linlai Global Elite vacuum tubes also elevated the sound field beyond the previous Black Treasure tubes.

Design specifications include dual mono power supplies with each channel supplied by it’s own high voltage and filament rails via a tube rectifier and feeding separate regulators to give incredible stereo separation.

A very simple but pure signal path based around the 6SN7 audio tube and using a single output capacitor which can be specifically chosen for it’s integration to solid state or valve amplifiers based on input impedance compatibility.

Masterpiece Edition Pre-amplifier features :

  • Dual mono design
  • Lineal Global Elite vacuum tubes
  • Khuzmo 48 way stepped shunt attenuator with Charcroft Z foil shunt resistor
  • Ohno Continuous Cast unicrystal silver 5N wire internal wiring
  • V-Cap CuTF output capacitors

Purity of signal path is critical in the design of any amplifier to give incredibly black backgrounds and the retrieval and portrayal of the tiniest musical passages and notes.

 

Price - £6000.00

Specification

 

Vacuum tube compliment 4 x Linlai Global Elite E-6SN7 matched pairs

1 x Philips 5Y3 Rectifier tube

Input impedance 47Kohm
Output Impedance 150 ohms
Inputs Balanced XLR pair and RCA unbalanced pair  Line inputs - Rhodium plated
Output Rhodium plated RCA Line out
Frequency response 10Hz - 50KHz
Power consumption 50VA
Gain 22dB
THD 0.3% 1Khz / 4Vef
S/N Ratio 90dB
Dimensions 440W x 370D x 185H (without tubes)
Weight 22Kg

Masterpiece Edition pre-amplifier - Image Gallery


MV3

MV3

Our latest Preamplifier is a full tube line stage design using 4 x 12AX7 specially selected tubes.

MV3 follows in the footsteps of the incredible MV2 using the same principles of minimum of active parts and high quality passive components in the signal path. A no compromise design and attention to components and internal wiring brings a product worthy of the Robson brand and a great match to our range of power amplifiers.

MV3 features

  • Blue Alps Swiss volume control
  • Low ripple power supply on the anode
  • R-type transformer
  • Duelund Coherent internal wiring
  • SE model upgrade to high end signal capacitors

Great design and the use of very high quality components has created a pre-amplifier of exceptional abilities and able to drive the most difficult of power amplifier loads to below 10Kohms.

Price

Standard model    £1600.00

SE model                £2000.00

Specification

Vacuum tube compliment 4 x JJ or Tung Sol 12AX7
Input impedance 47Kohm
Input Unbalanced
Output Unbalanced
S/N 88dB
Frequency Bandwidth 10Hz - 45KHz
Dimensions 240W x 320D x 117H 
Weight 7Kg
   
   
   
   

MV3 - Image Gallery


MV2

MV2

Our flagship reference Pre-amplifier to compliment our mono block power amplifiers and Phono stage Pre-amplifiers.

As standard hand made using very high quality components in the signal path, our MV2 valve pre-amplifier will compete with the very best products out there regardless of cost.
Again……listening is believing!!

Design specifications include dual mono power supplies with each channel supplied by it’s own high voltage and filament rails via a tube rectifier and feeding separate regulators to give incredible stereo separation.

A very simple but pure signal path based around the 6SN7 audio tube and using a single output capacitor which can be specifically chosen for it’s integration to solid state or valve amplifiers based on input impedance compatibility.

MV2 features :

  • Dual mono design
  • Tung-Sol vacuum tubes upgradable to Black Treasure or Pavane
  • Khuzmo 48 way stepped shunt attenuator
  • Duelund Coherent Audio internal wiring
  • Miflex paper/oil output capacitors

Purity of signal path is critical in the design of any amplifier to give incredibly black backgrounds and the retrieval and portrayal of the tiniest musical passages and notes.

If you have never heard a valve based pre-amplifier of this class you will be amazed at how much information you may be missing in your vinyl or digital music collection.

PRICE  

Standard Model   £2600.00

SE model  £3000.00

Specification

 

Vacuum tube compliment 4 x Tung-Sol 6SN7GTB

1 x 6X5 Rectifier tube

Input impedance 47Kohm
Output Impedance 150 ohms
Inputs 2 x RCA Line inputs
Output RCA Line out
Frequency response 10Hz - 50KHz
Power consumption 50VA
Gain 22dB
THD 0.3% 1Khz / 4Vef
S/N Ratio 88dB
Dimensions 380W x 320D x 130H ( without tubes )
Weight 11Kg

MV2 - Image Gallery