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Building a Valve Amplifier Part 3: Testing the Prototype, Adjusting the Design and Planning the Enclosure
Dave Ives
I currently look after production at AB Open. I have a background in the arts, environmental conservation and IT support. In my spare time I do a bit of DJing and I like making things.


July 29, 2019 06:36

I have experimented with building mono-block amps over the last few months and have settled on the 6P1P-EV valve. It costs 1/5 of an EL84 and lasts up to 4 times longer. I also built a quad EL84 amp but the cost of that was just silly.
As a hint if you are using the Hammond chassis (like I do) then maybe use a thick aluminium mesh as the bottom cover. With feet attached it encourages airflow and helps to cool everything down.

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July 30, 2019 07:18

@mbaker335 thanks - I like the mesh idea for the bottom cover

July 8, 2019 06:30

Awesome stuff.Im giving it a crack.What did you do for power supply in the end?

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June 25, 2019 12:29

It was common practice in the old days (I'm 86, and used to be a research engineer at The Marconi Co.) to put power transformers cores at right angles to output transformer cores, smoothing chokes, etc., to avoid any magnetic coupling between them from causing hum.

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June 27, 2019 07:12

@BrookeHarvey thanks - I'll take that on board when we do the power supply.

June 25, 2019 12:29

I am actually surprised you can still source valves and transformers to go with them. I am not talking of the metal encased Kilowatter valves. I am talking of the glass bottles I grew up with.
The sound from a valve amplifier is just something else. Nothing beats it.

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