Comments on: 20W Power Tube Amplifier with EL34 https://circuitdiagram.net/20w-power-tube-amplifier-with-el34.html Schematic & PCB Design Thu, 25 Dec 2014 05:39:21 +0000 hourly 1 By: Alexsander Bittencourt Vieira https://circuitdiagram.net/20w-power-tube-amplifier-with-el34.html#comment-166835 Fri, 14 Nov 2014 04:02:01 +0000 http://circuitdiagram.net/?p=700#comment-166835 Only Bias circuit is incorrect. EL34 operate with negative voltage in the grid 5. For correction, invert diode and capacitors polarity in power source: 10uF 100V with positive connector in ground 🙂

Adjust bias corrent 35-45mA range. Caution for plate not stay red.
Good look and sorry… my english is less.kkk

]]> By: karnakstudio https://circuitdiagram.net/20w-power-tube-amplifier-with-el34.html#comment-122681 Thu, 29 Dec 2011 14:21:52 +0000 http://circuitdiagram.net/?p=700#comment-122681 The schematic diagram is incorrect, in the grid of El34 the bias voltage is negative….the bias circuit is incorrect

]]> By: circuit diagram https://circuitdiagram.net/20w-power-tube-amplifier-with-el34.html#comment-108304 Thu, 26 May 2011 05:43:31 +0000 http://circuitdiagram.net/?p=700#comment-108304 In reply to Christotech.

12AX in a tube. It has pin which need to be connected to power source. Find the datasheet to know its pin assignment.
1M in a value for resistor. For diode, you may use GBPC102 bridge diode rectifier or 4x1N5400 , 4x1N5401 or 4x1N5402 single diode rectifier

]]> By: Christotech https://circuitdiagram.net/20w-power-tube-amplifier-with-el34.html#comment-108189 Wed, 25 May 2011 22:30:03 +0000 http://circuitdiagram.net/?p=700#comment-108189 Pls i want to know wt kind of compnt is this 12AX,1m,5.34 & the number of the bridge retifier.The output,input of the power pack.I wil be glad 4 ur reply

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