el34 | Electronic Schematic Diagram https://electronicscheme.net Schematic Diagram & PCB Design Sat, 27 Jun 2015 23:21:23 +0000 en-US hourly 1 https://i0.wp.com/electronicscheme.net/wp-content/uploads/2017/05/cropped-transparent_text_effect.png?fit=32%2C32&ssl=1 el34 | Electronic Schematic Diagram https://electronicscheme.net 32 32 129969089 2x90W Stereo Tube Power Amplifier with EL34 https://electronicscheme.net/2x90w-stereo-tube-power-amplifier-with-el34/?utm_source=rss&utm_medium=rss&utm_campaign=2x90w-stereo-tube-power-amplifier-with-el34 https://electronicscheme.net/2x90w-stereo-tube-power-amplifier-with-el34/#comments Mon, 17 Aug 2009 02:23:00 +0000 http://electronicscheme.net/?p=228 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 […]

The post 2x90W Stereo Tube Power Amplifier with EL34 first appeared on Electronic Schematic Diagram.]]> 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:

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Stereo Valve Power Amplifier

1 file(s) 1.32 MB
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The post 2x90W Stereo Tube Power Amplifier with EL34 first appeared on Electronic Schematic Diagram.]]> https://electronicscheme.net/2x90w-stereo-tube-power-amplifier-with-el34/feed/ 2 228 35W Tube Power Amplifier with EL34 https://electronicscheme.net/35w-tube-power-amplifier-with-el34/?utm_source=rss&utm_medium=rss&utm_campaign=35w-tube-power-amplifier-with-el34 https://electronicscheme.net/35w-tube-power-amplifier-with-el34/#comments Fri, 22 May 2009 13:21:56 +0000 http://electronicscheme.net/?p=94 This is the circuit diagram of 35W Tube Power Amplifier with EL34. This tube amplifier designed in 1953 and worked from 1954 until 1989. If […]

The post 35W Tube Power Amplifier with EL34 first appeared on Electronic Schematic Diagram.]]> This is the circuit diagram of 35W Tube Power Amplifier with EL34. This tube amplifier designed in 1953 and worked from 1954 until 1989. If you’re interested with classic circuit and classic components, then you should try this circuit. The circuit is interesting but i think it is hard to find the tubes.

Schematic Diagram:

35W Tube Power Amplifier Circuit with EL34

Power Supply:

35W Tube Power Amplifier with EL34 circuit diagram

Component List:

R1 = 470K 0,5W R13-21 = 820K 0.5W C8-9 = 0.1uF 630V
R2-5 = 2K2 0.5W R14-22 = 5K6? 0.5W C10-14 = 0.47uF 630V
R3 = 150K 0.5W R15-20 = 680K 0.5W C11-13 = 25uF 40V
R4 = 220K 0.5W R16-19 = 100K 0.5W V1 = E80CC
R6-10 = 56K 0.5W R17-18 = 3K3 1W V2 = E80CC
R7 = 3.9K 0.5W R24 = 470R? 2W V3-4 = EL34
R8 = 220R? 0.5W TR1-2 = 470R? 1W Variable (adj. 270O) Rectifier tube =?Z2C
R9 = 1M? 0.5W C1-3-6-7 = 0.1uf 630V T1 = Audio Transformer for 2x EL34 Push Pull
R11 = 39K 1W C2 = 220pF 600v
R12-23 = 180K 0.5W C4-5 = 16uF 550V

It is a classic design of power amplifier 35 W using tube, with two EL34 in connection Push-Pull, by Siemens & Halske, with design date 03/24/1953 and code SV410 / 1. The amplifier worked from 1954 to 1989, whenever and went off, with an average lifespan of 15 hours a day. Showed no particular damage beyond the replacement tubes, resistors and capacitors, resulting from natural wear.

A significant change was the replacement of the rectifier device of lamp diodes. The only problem will be for those who try their construction, will be the output transformer (applies to all tube manufactures), because the code is not helpful. Can be replaced with a conventional output transformer suitable for EL34. During the construction, it is need (applies to all circuits respectively) enough electronic experience and attention to the high voltage, electric shock risk.

source: http://users.otenet.gr/~athsam/Power_amplifier_EL34.htm

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