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The electron tube is a marvellous device
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Author: Ricardo Pastor Asensi

EL84 bias issue on Mullard 3-3 tube amplifier

20/08/2021
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| 1955 Tube Amp

In the original Mullard 3-3 design the operating point of the EL84 tube is highly dependent of the amplification factor of the EF86 valve.

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How to reduce the input sensitivity of the tube amplifier

06/01/2021
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| Uncategorized

How to calculate a voltage divider to reduce the input to the valve amplifier

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One year of operation of the 1955 Tube Amp with no breakdowns.

11/05/2020
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| 1955 Tube Amp
Model 1955 EL84 SE Tube Audio Amplifier one year old

It has been a year of using the first model 1955 tube audio amplifier built in May 2019 that I have in my living room. The tube amp has been running two to three hours a day to listen to jazz or classical music, often connected to a raspberry computer-based Internet radio receiver with Kodi software.

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Performance measurements on the Model 1955 (Mullard 3-3) tube amp

08/04/2020
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| 1955 Tube Amp

New performance measurements have been made over the 1955 (Mullard 3-3) tube amplifier. You can see it on the 1955 tube amp measurements page.

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The project

Going back to the electronics of the early years, when the components and wires could be handled with bare hands.

The technology

Avoiding the use of semiconductors or printed circuit boards.
High quality parts.
Hand wired.

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