2x90W Stereo Tube Power Amplifier with EL34

2x90W Stereo Tube Power Amplifier with EL34 circuit diagram

This document is the manual of 2x90W Stereo Tube Power Amplifier with EL34, model K4040 by Velleman. The document in PDF version contain of schematic diagram, part list, component guide, step by step how to build the circuit. This circuit is for advance hobbysts… 🙂

Stereo Tube Power Amplifier Features:

  • Pure valve sound with high quality EL34 valves.
  • High quality black and chrome housing.
  • Chrome valve socket covers.
  • Easy bias adjustment with LED indication.
  • Removable bottom for easy access and service.
  • High quality capacitors and components.
  • Gold plated input and speaker terminals.
  • Standby function.
  • Soft start circuit for power transformer.

Stereo Valve Power Amplifier Specifications:

  • 2 x 90Wrms in 4 or 8W.
  • Up to 2 x 15Wrms full class A.
  • Bandwidth: 8Hz to 80KHz (-3dB/1W).
  • Harmonic distortion: 0.1% @ 1W/1KHz.
  • Signal to noise ratio: >105dB (A weighted).
  • Input sensitivity: 1Vrms.
  • 115VAC or 230VAC / 500VA max.

Download the complete TUTORIAL of 2x90W Stereo Tube Power Amplifier with EL34 from the following link:

One thought on “2x90W Stereo Tube Power Amplifier with EL34

  1. Linda

    Dear Sir:

    Glad to hear from you!

    We are the direct agent of Shuguang and NGG vacuum tube manufacturers,we can supply the different types of tubes,including 12AX7,6L6,EL34,KT66,KT88,300B,2A3 etc.

    Shuguang is the biggest electron tube factory and brand in Asia, it has long history and the quality is very good,the price is also competitive.The NGG brand use the same technical as Shuguang,the designer of Ngg at present was the main designer in Shuguang before.We can supply both the 2 brands and good service for you.We’re surely that our products will satisfy you.

    If you have any enquiry or would like to have a try,pls do not hesitate to contact me.We sincerely hope to establish long business relationship with you!

    Best regards!

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