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
Pete
You can find details here: NuClassD 50W Nutube hybrid amp
Pete
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.
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!
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!
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.
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.
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.
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
No problem Pete, have a great journey.
Does the board need any additional heatsinking?
Pete will answer, but it is already in "bridged output" mode, so pushing 2 Ω is asking for trouble. Internally it has a self-protection-on-thermal-overload circuit, so you could safely try it, but don't expect great results. At least that's from y review of the circuit schematic and Class-D power amplifier module docs. GoatGuy
As was mentioned... it can drive 2 ohms but the current will be high, so the IC will heat up at fairly low power outputs. I^2*R, you know...
Pete
Looks like this will become my "Summer amplifier". I'm hopeful that with a little tweaking it will sound close enough to my 845 SE that heats the house through other seasons.
Thank you Pete, for publishing your design and making the build practical by supplying the PCB with SMT components already attached
Thank you Pete, for publishing your design and making the build practical by supplying the PCB with SMT components already attached