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Posted "NuClassD" amp design: 50W hybrid class-D / Korg Nutube
Posted "NuClassD" amp design: 50W hybrid class-D / Korg Nutube
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Old 29th October 2018, 12:18 AM   #1
pmillett is offline pmillett  United States
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Default Posted "NuClassD" amp design: 50W hybrid class-D / Korg Nutube

I finally got to documenting the design of the 50 watt hybrid amp design I've been playing with for some time. It uses the Korg Nutube as a gain stage in front of a Monolithic Power MP7770 self-oscillating class-D amp chip (as well as a few JFETs).

You can find details here: NuClassD 50W Nutube hybrid amp

Click the image to open in full size.

Pete
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Old 29th October 2018, 01:43 AM   #2
dtaylo3 is offline dtaylo3  United States
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Very nice!!! Kudos once again. How do you think this new hybrid might sound compared to your Nutube buffer (which I purchased but have yet to solder up) leading into a Hypex amp? I currently have multiple Hypex amps, but miss the sound of my old EL34 that has been in sick bay for a few years. So I purchased your buffer. I may have to purchases this one as well in order to compare the two.
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Old 1st November 2018, 09:35 PM   #3
pinkfloyd4ever is offline pinkfloyd4ever  United States
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Man Pete! This sounds awesome, but I already have too many projects in the cue! Looks like I'm going to have to add another.


Just wanted to take the opportunity to thank you for all your great designs and for sharing them with the DIY community. I really enjoyed building and listening to your SSMH and a couple versions of the Millet Hybrid Maxed, one of which I'm listening to as I type.

Cheers!
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Old 2nd November 2018, 08:31 PM   #4
HiGHFLYiN9s is offline HiGHFLYiN9s  United States
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I'm very excited to get mine built Pete, love the idea of a super efficient tube amp

512-P6KE30A was all sold out at Mouser, assuming this is a good sub? 625-P6KE30A-E3


Also, are 2% resistors okay, or do they need to be 1% on the amp boards?

TIA.
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Old 3rd November 2018, 01:29 AM   #5
Vunce is offline Vunce  United States
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Posted "NuClassD" amp design: 50W hybrid class-D / Korg Nutube
Hello Pete,


I went to the webstore and orders won't be processed until late
November
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Old 5th November 2018, 10:24 PM   #6
HiGHFLYiN9s is offline HiGHFLYiN9s  United States
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Looks like he'll be back on the 23rd.
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Old 6th November 2018, 10:07 AM   #7
pmillett is offline pmillett  United States
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Quote:
Originally Posted by Vunce View Post
Hello Pete,


I went to the webstore and orders won't be processed until late
November

Yeah, sorry about that - in Japan for a week then Europe for two, so I shut down the store until I get back.
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Old 6th November 2018, 10:08 AM   #8
pmillett is offline pmillett  United States
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Quote:
Originally Posted by HiGHFLYiN9s View Post
I'm very excited to get mine built Pete, love the idea of a super efficient tube amp

512-P6KE30A was all sold out at Mouser, assuming this is a good sub? 625-P6KE30A-E3


Also, are 2% resistors okay, or do they need to be 1% on the amp boards?

TIA.

2% resistors are OK, as is the TVS substitute.

Pete
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Old 6th November 2018, 09:32 PM   #9
Vunce is offline Vunce  United States
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Posted "NuClassD" amp design: 50W hybrid class-D / Korg Nutube
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Originally Posted by pmillett View Post
........so I shut down the store until I get back.
No problem Pete, have a great journey.
Does the board need any additional heatsinking?
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Old 6th November 2018, 11:39 PM   #10
pmillett is offline pmillett  United States
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Not for normal music applications. If you run a 50W sine wave, though, it will hit a thermal limit and shut down after some time.

I haven't tried adding any external heatsinks.

Pete
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