Author Topic: Hybrid GaN FET Amplifiers - including 300B  (Read 596 times)

Offline Response Audio

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Hybrid GaN FET Amplifiers - including 300B
« on: May 01, 2024, 12:02:04 PM »
I recall some time ago asking about Hybrid GaN FET amplifiers. While many have done it with various Class D amps, I wanted to go after the latest GaN FET technology. While I was with Purity Audio Design, we started designing a tube input stage. We decided on two circuits.

The first is our twin circuit 12AU7 or 12AT7 which is the driving force in the MA200H. We could not be happier with this model. Available with single ended or both single ended and balanced inputs.



To take things further into the DHT world, we working on a new input stage using the 300B tube. I cannot put into words how amazing this hybrid amp is. For the 300B version, we stepped up to a 300 watt GaN FET module.

We have a company that now builds GaN FET modules for us

To compliment these designs, I am in the process of making enhancements and adding a second stage to the to the new Spirit linestage (formerly the Purity Audio Design Foundation Pre). We will, of course, keep the Bluetooth streaming board with digital outputs but now adding a second digital output. 

My goal is to offer these products at a real world price.

https://responseaudiony.com/
Design Engineer
Response Audio NY
Custom Vacuum Tube Deaign
www.ResponseAudioNY.com

Offline Nick B

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Re: Hybrid GaN FET Amplifiers - including 300B
« Reply #1 on: May 01, 2024, 10:46:43 PM »
I recall some time ago asking about Hybrid GaN FET amplifiers. While many have done it with various Class D amps, I wanted to go after the latest GaN FET technology. While I was with Purity Audio Design, we started designing a tube input stage. We decided on two circuits.

The first is our twin circuit 12AU7 or 12AT7 which is the driving force in the MA200H. We could not be happier with this model. Available with single ended or both single ended and balanced inputs.



To take things further into the DHT world, we working on a new input stage using the 300B tube. I cannot put into words how amazing this hybrid amp is. For the 300B version, we stepped up to a 300 watt GaN FET module.

We have a company that now builds GaN FET modules for us

To compliment these designs, I am in the process of making enhancements and adding a second stage to the to the new Spirit linestage (formerly the Purity Audio Design Foundation Pre). We will, of course, keep the Bluetooth streaming board with digital outputs but now adding a second digital output. 

My goal is to offer these products at a real world price.

https://responseaudiony.com/

That 300B version sure sounds interesting. Do you have an ETA on the finished version?
Nick
Orchard Starkrimson Ultra amp
Hattor Big preamp
JMR Voce Grande speakers
Holo Cyan2 dac
Holo Red streamer
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Roon, Tidal, Qobuz
PI Audio UberBUSS

Offline Response Audio

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Re: Hybrid GaN FET Amplifiers - including 300B
« Reply #2 on: May 02, 2024, 07:36:46 AM »
Thank you Nick. By the end of this month I hope to have a finished piece up and running.
Design Engineer
Response Audio NY
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www.ResponseAudioNY.com

Offline mresseguie

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Re: Hybrid GaN FET Amplifiers - including 300B
« Reply #3 on: May 02, 2024, 09:29:11 AM »
A 300b/GanFet amp? You have my attention.

Short of my traveling 2900 miles due east to hear your gear <not gonna happen>, how does one get to hear your products if one lives on the west coast? Any chance you'll attend the Pacific Audio Fest this year?

Michael
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Don Sachs dual mono 300b; Nuprime Evolution STA
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Offline Response Audio

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Re: Hybrid GaN FET Amplifiers - including 300B
« Reply #4 on: May 03, 2024, 07:38:40 AM »
Hey Michael. With the redirection of the company, we will not be able to make the show. I will see what I can do to get one out to that area for auditions.
Design Engineer
Response Audio NY
Custom Vacuum Tube Deaign
www.ResponseAudioNY.com

Offline mresseguie

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Re: Hybrid GaN FET Amplifiers - including 300B
« Reply #5 on: May 03, 2024, 09:22:11 AM »
Thanks.

 :thumb:
Daedalus Audio Apollos; Fritz Loudspeakers LS/5-R
SW1X NOS DAC III BAL/SPL; Holo Spring3 KTE
Don Sachs Model 2 preamp
Don Sachs dual mono 300b; Nuprime Evolution STA
Hapa loom
PI Audio UberBUSS, DigiBUSS, Uber-MiniBUS