Developing the MA100 amplifier

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Originally Posted by Radford Revival

- I've managed to simplify the design massively AND improve performance at the same time!

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That's fantastic Will, that's always a win-win.
Hope your health is improved now.

Seasons greetings.

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Originally Posted by Firebottle

That's fantastic Will, that's always a win-win.
Hope your health is improved now.

Seasons greetings.

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Thanks Alan - I'm getting there. It has been a tough year. Hope you have a great Christmas!

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Originally Posted by Radford Revival

Just a small update - this project is most certainly not dead!

Despite being somewhat unwell for much of this year I have been plugging away in the background on this and have actually improved upon the design massively - it has turned into something rather special. I am actually somewhat glad things got delayed - I've managed to simplify the design massively AND improve performance at the same time! I had also identified some subtle design flaws in the original concept which have been rectified. This is why I'm glad I didn't plough forward with some earlier version. There have been over 50 versions of this circuit but they are rapidly converging on a pleasingly simple solution....


The final amplifier will have performance previously thought impossible from a push-pull transformer coupled valve topology.

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Fantastic stuff, Will. I've no doubt that the final build will indeed be rather special. All power to you, my friend. You're a credit to AoS and today's electrical engineers. Hope you recover fully, and as soon as possible, from your illness.

Have a lovely Christmas:christmas:

Marco.

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Originally Posted by Marco

Fantastic stuff, Will. I've no doubt that the final build will indeed be rather special. All power to you, my friend. You're a credit to AoS and today's electrical engineers. Hope you recover fully, and as soon as possible, from your illness.

Have a lovely Christmas:christmas:

Marco.

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Thanks for the kind words Marco :) Hope you also have a great Christmas!

Work is ongoing - many design refinements have been made - especially to the drive circuitry. Each output valve is now driven by a 1Mhz bandwidth ultra-low distortion class A driver circuit - the wide bandwidth for technical reasons, not bragging rights.

The bias servo has also benefited from some refinements and simplifications, and the chassis design is also finally taking shape.

Very much looking forward to seeing some pictures of the MA100 Will. Sounds like you are making steady and important progress with this project.

Chat soon. Please say "Hi" to your Dad. Hope you both keeping well.

Edward

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Originally Posted by Edward

Very much looking forward to seeing some pictures of the MA100 Will. Sounds like you are making steady and important progress with this project.

Chat soon. Please say "Hi" to your Dad. Hope you both keeping well.

Edward

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Hi Edward

Hope to post some pictures when the prototype chassis is up and running - we have some off the shelf chassis that are roughly the right size to test all the PCB assemblies before moving over to custom metalwork. :)

Getting much closer now, tentatively stating that this amp will be epic!

More progress made, prototype mains transformers have arrived and PCBs nearing completion

PCBs of the new version of the amp coming soon! The project is in fact coming together finally. Took a while but I have officially broken the back of it now. Watch this space.