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Old 6th April 2009, 01:02 PM   #1
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Default 3-stage DC-coupled Ampl

Folks,

Any hints, tips, tricks for designing a 3-stage all DC-coupled amp?

Reference designs, schematics, and sample circuits welcome.

TIA,
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Old 6th April 2009, 02:12 PM   #2
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Did you look at the Crystal Palace amp in Morgan Jones' book? He goes over the design in detail.
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Old 7th April 2009, 07:38 AM   #3
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I have the strong belief that the key to stable, reliable amd predictable multi-stage DC-coupled tube amps is to use the precision of SS. Regulate, regulate, regulate! If you don't, you run the risk of the amp being adversely affected by mains supply fluctuations, tube ageing and even the weather.

Mutiple DC-coupled stages were not considered seriously a few decades ago, because there was no practical way of making them stable. Nowadays we have access to devices that open the door to success, like high voltage transistors, MOSFETS and zeners. So long as they're treated with due care, they can serve very well in the quest to eliminate capacitors from the signal path yet still utilize tubes for the gain stages.
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Old 7th April 2009, 02:04 PM   #4
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Default It's in french but ...

1st part
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Old 7th April 2009, 02:04 PM   #5
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Default 2nd part

2nd part
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Old 7th April 2009, 02:04 PM   #6
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Default 3rd part

3rd part

Good luck
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Old 7th April 2009, 04:16 PM   #7
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Default Re: It's in french but ...

Quote:
Originally posted by fg031956
It's in french but ...
Merci beaucoup.

-- josé k.
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Old 7th April 2009, 05:15 PM   #8
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But you can LOOSLEY translate it at google or babelfish.
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Old 7th April 2009, 09:09 PM   #9
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Well, SS regulation isn't the only way, there's always this approach
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Old 8th April 2009, 07:19 PM   #10
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Default One more

Look nice. Not tested.
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