Simple 200 watt complimentary FET amplifier (possibly tube driver?)

deltavektor · 20th November 2009, 04:20 PM

I am looking for ideas on a simple 200 watt ss amplifier (full complimentary output) using FET devices.

Recently I am convinced that a solid-state amplifier is the way to go instead of trying to scrape together a high power tube amplifier.

How difficult is it to add a tube based driver stage to a solid-state output stage?

TIA

PigletsDad · 20th November 2009, 05:32 PM

How knowledgeable are you?

There are lots of good kits for SS amps, if you want to build a known design; some of these have FET output devices.

If you want to design your own, I suggest you start off by looking at some of the existing designs, and understanding the issues that they solve.

Hybrid designs (tubes+ SS output) exist; they are some what harder to do well, due to the lack of P-type tubes, but some very good ones have been published.

What is the intended use of the amp? The design tradeoffs for say driving the low-bass in a PA system are fairly different to those for driving a Hi-Fi system.

nigelwright7557 · 20th November 2009, 10:20 PM

I designed my own MOSFET amp with a tube front end.

I opted for an SRPP stage driving into a standard class AB MOSFET amp with the gain reduced to allow for the tube gain. It sounds very clean. If your not after a clean sound (ie guitar amp) then a more basic tube stage might be in order.

blondfire · 21st February 2010, 03:53 PM

Dude,
Could i get the circuit design from you for this amp?
I've wanted to build a hybrid for a while.

Quote:

Originally Posted by nigelwright7557

I designed my own MOSFET amp with a tube front end.

I opted for an SRPP stage driving into a standard class AB MOSFET amp with the gain reduced to allow for the tube gain. It sounds very clean. If your not after a clean sound (ie guitar amp) then a more basic tube stage might be in order.

nigelwright7557 · 21st February 2010, 05:10 PM

Quote:

Originally Posted by deltavektor

I am looking for ideas on a simple 200 watt ss amplifier (full complimentary output) using FET devices.

Recently I am convinced that a solid-state amplifier is the way to go instead of trying to scrape together a high power tube amplifier.

How difficult is it to add a tube based driver stage to a solid-state output stage?

TIA

Have you thought about a hybrid ?
Power of a MOSFET with a valve sound.

apexaudio · 21st February 2010, 10:47 PM

APEXaudio Simple 240/350W MOSFET Amp.

momon · 15th May 2011, 08:15 AM

pcb lay out?

20th November 2009, 04:20 PM	#1
deltavektor diyAudio Member Join Date: Sep 2008	Simple 200 watt complimentary FET amplifier (possibly tube driver?) I am looking for ideas on a simple 200 watt ss amplifier (full complimentary output) using FET devices. Recently I am convinced that a solid-state amplifier is the way to go instead of trying to scrape together a high power tube amplifier. How difficult is it to add a tube based driver stage to a solid-state output stage? TIA

20th November 2009, 10:20 PM	#3
nigelwright7557 diyAudio Member Join Date: Apr 2008 Location: Carlisle, England	I designed my own MOSFET amp with a tube front end. I opted for an SRPP stage driving into a standard class AB MOSFET amp with the gain reduced to allow for the tube gain. It sounds very clean. If your not after a clean sound (ie guitar amp) then a more basic tube stage might be in order. __________________ http://www.murtonpikesystems.co.uk PCBCAD40 pcb design software.

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20th November 2009, 05:32 PM	#2
PigletsDad diyAudio Member Join Date: Jul 2007 Location: South Worcestershire	How knowledgeable are you? There are lots of good kits for SS amps, if you want to build a known design; some of these have FET output devices. If you want to design your own, I suggest you start off by looking at some of the existing designs, and understanding the issues that they solve. Hybrid designs (tubes+ SS output) exist; they are some what harder to do well, due to the lack of P-type tubes, but some very good ones have been published. What is the intended use of the amp? The design tradeoffs for say driving the low-bass in a PA system are fairly different to those for driving a Hi-Fi system.

15th May 2011, 08:15 AM	#7
momon diyAudio Member Join Date: Mar 2011 Location: malang	pcb lay out?

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