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Small but nice !

With the solgan "Wolf in sheep's clothing" Mr. Nixie presents a very tiny tube headphone amp but it's really a deep me, even if it's small outline footprint of only 85 x 85 mm.

2 pcs. 6N28B-V miniature dual triodes from Russian military surplus operate as preamplifier stages to a stereo Class A MosFet impedance transformer stage with 300 mA idle current each. These triodes are specially designed to operate on low anode voltages, have an ultra long life, less microphonic noise and are shock proof. BTW, Pete Millet's "Starving Student" amplifier was the template for this improved circuity.

Compared with many similar amplifiers from Chinese production, which operates the 6922 triodes with only 1/10 of the suggested anode voltage, the tubes in this tiny amplifier operates with 45 V and therefore exact within their specifications; and this you'll just hear.

The measuring datas approve the listening testings: light, soft and with a warm sound. And this tiny amplifier can provide real power if needed without sounding annoying or nasty.

Der Frequenzgang ist faktisch linear, egal ob an 150 oder 32 Ohm, der Innenwiderstand ist unter 1 Ohm, die Klirrkomponenten - Röhrentypisch mit viel K2 - steigen erst zur Aussteuerungsgrenze auf über 5 % an, und sinken linear bei geringerer Aussteuerung bis auf weit unter 0,1 %.

Brian Stuckey has made a nice review of this amplifier


  • DC-Connection: 12...15 VDC 2.1/5.5 mm inner "+", fused by Polyfuse
  • Headphone connection: 6.3 mm NEUTRIK stereo jack
  • Line input: 2 x RCA
  • Slow turn on of the filament voltages
  • Input impedance: 4.7 kohm
  • Amplification: ca. 14 dB
  • Min. input level for full output power: ca. 770 mV (Volume set to maximum)
  • Min. headphone impedance: 25 ohm
  • Power consumption: ca. 9 VA
  • Dimensions (with heat cover) W x D x H: 85 x 85 x 65 mm
  • Weight: 190 g

What you'll need:

  • 2 hour of your evening time with no hurry
  • A clear, well-lit area in which to work
  • Soldering station and fine electronic solder
  • Multimeter to check the generated voltages
  • Electronic tools
  • A loupe may be helpful
  • TX8/10 (Torx) and PH1 screwdriver
  • Download of the manual
  • Enjoyment of your work of course
  • 12 VDC power supply (offered separately)
  • For connection to a computer e.g. the offered Behringer USB audio interface


Due to the Corona virus and the issues by several shipping services, automatic PayPal payment via basket is suspending.
Please contact first if you are interested.

Fully inclusive kit with all electronical and mechanical components and optional Behringer UCA-202 USB-Audio-Interface.

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Shipping costs
Flat shipping costs of 7.50 or 8.50 EUR are added to cart
The prices of the DE / EU versions includes the German VAT.
Handling fees
Higher handling costs for export are already included in the item price exept of import duties, taxes etc. These charges are the buyer's responsibility.
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