Hansen 10 watt guitar Amplifier. |
I have tried before. to make a Push-Pull amplifier with ECL86 tubes. It was a failure and
ended up becoming an AC-15 type. |
I have drawn the following Layout for power supply and amplifier. |
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So much work, and so "failure". It simply did not work. Something had to be done. So one
turn on the shelves for alternative components and then back to the drawing board.
I found some ECL82 output tubes and 2 preamplifier tubes ECC82 and EF83.
ECL82 has a different leg configuration than ECL86 and all tubes have a smaller reinforcement than those
previously used. |
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A new layout was created on the existing Turret Board. |
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With voltage connected, the amplifier played really well but there was an annoyingly weak hum.
With a little teaching from Bjarne Hansen, the anode and cathode resistance values were changed so that the individual
tube gain times the value of the cathode resistor gave the value of the anode resistor.
It provided an almost silent amplifier that plays with the selected tubes with very little distortion and
yet abundantly high for home use. |
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The amplifier is equipped with 2 12" "Hansen" Speakers. |
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