ANK Audiokits Valve Amplifiers
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  “A stunning new arrival at ANKits
and a perfect addition to our
Level 4 & 5 products”

BRIAN SMITH

 
 

The L4 shunt power supply based pre-amplifier

ANkits is proud to release a new L4 Pre-amplifier for 2016, part of our new Level 4 & Level 5 Series products. With the success of our Level 5 Mentor Pre-amplifier we wanted to introduce a SHUNT power supply based pre-amplifier with the same Mentor line board in a more affordable package. When choosing an ANKits amplification system comprised of our Single Ended or CLASS AB Monoblocks mated with an L4 Pre-amplifier the result will be sheer astonishment.

 
 

In the L4 we use Triple C-Core output transformers for maximum signal energy transfer and the ability to handle long interconnection runs. The result is outrageous dynamics, subtleties and sensitivity delivered to the power amplifier.

 
 

The heart of this new L4 Pre-amplifier design is the shunt based film cap power supply. A good pre-amplifier needs to provide lightning fast response to the demanding changes in the audio signal. The L4 has been beautifully designed with a large mains transformer and 2 choke set for the power supply along with taking advantage of some of Mundorf’s finest capacitor technology with the EVO oil and tube capacitors .

 
 

6SN7 input & ECC99 driver stage

The Driver stage employs the popular 6SN7 input stage followed by an ECC99 to drive the C-Core output transformers. We have selected V-CAP and Takman non magnetic carbon resistors for the line board along with ELNA Silmic electrolytics

An ELMA selector and extension kit are used to allow very short wire runs from the input RCAs to the output board. The filament section has a separate board with individual heaters for each line stage tube.

 

 
 
 

Shunt power supply 5U4GB

The Level 4 power supply is the heart of the L4 Pre-amplifier. Utilising part of the Mentor power supply this ‘Baby Mentor’ has a 4 pole choke & 1 x 5U4G Tube Rectification, 35mm Mundorf Mlytic Power Supply Capacitors and SHUNT regulation. SHUNT regulation provides an additional reservoir of current (??ma) to be running from B+ at all times separate from the standard current draw of the line stage. Thus when music makes quick changes and demands instantaneous current addition, this additional current will come from the Shunt resistor mounted on the chassis.

 
     
     
 

KHOZMO 48 step attenuator

We supply the L4 Pre-amplifier with this top quality attenuator that ensures there is absolutely minimal losses in the signal path. With a long life in excess of 50,000 cycles they are a perfect match for the L5 pre-amplifier.

  • SHUNT type: Only two resistors in signal path
  • Switching type: MBB (Make Before Break)
  • Attenuation range: -60 dB - 0 dB
  • Attenuation per step: steps 1 to 11 - 2dB, 12 to 48 - 1dB
  • Contact material: Hard gold • Polished wiper and contact pins
  • Extremely short signal path • Channel matching: +/-0.1 dB
  • Resistors: Vishay/Dale RN55 1% 100ppm , 1/8W, low noise, non-inductive, metal film • Precision ball bearing support
 
     
         
 

Design strategy

We have introduced the L4 Pre-amplifier to accommodate requests from customers seeking the very best "amplification systems" in a more affordable configuration. Typically buyers would select a pair of Single Ended 300B or CLASS AB EL34 Monoblocks with C-Cores and then find that our top of the line Mentor pre-amplifier exceeded their budget. So we decided to take some of the key Mentor features and put them in a more affordable package. The L4 Shunt based pre-amplifier delivers the outstanding dynamics reserved for the worlds very best pre-amplifiers. It provides the opportunity to own an amazing line pre-amplifier and monoblock combination without breaking the bank. You would get unparalleled performance with the new L4 Shunt C-Core design and a pair of our monoblocks that rivals the very finest equipment in the audio industry at any price.

 

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System Package Example
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L4 Preamplifier $3950
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EL34 Level 3 MonoBlocks $3500
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10% System Discount $745
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Total $6705
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Specifications:

Output Tubes: 1 x 6SN7 Electro Harmonix & 1 x ECC99 JJ
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Rectifier Tubes: 1 x 5U4GB
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Outputs: 1 x Stereo Pair RCA to a
Power Amplifier
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Inputs:
4 x Stereo Pair RCA
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PCBs: Sturdy PCBs with 2oz copper trace and thick grounding/ HT traces
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Chassis: 3mm Aluminum with Black Powder Sandtex
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Width: ?? cm
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Height: ?? cm
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Depth: ?? cm
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Weight: ?? Kilos

 

Parts Compliment includes:

Large Mains Transformer
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1 x 4 Pole Choke
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Triple C-Core Output Transformers
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Takman Non Magnetic Carbon Resistors
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V-CAPs & Mundorf Capacitors
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Elna Silmic Electrolytics & Mundorf 35mm Mlytics in Power supply
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KHOZMO attenuator
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ELMA Selector
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Audio Note Silver RCA jacks
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L4 Pre-Amplifier C-Core

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L4 Pre-Amplifier C-Core
Assembled kit version by Digitalpete

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