I also purchased the Class A/B Dayton Audio SPA250 to try out. This amp is rated 252 watts at 4 ohms with less than 1% THD. This is a VERY popular plate amplifier on Parts Express with nearly 5 star average with well over 200 reviews.
You may be asking...why 250 or 300 watts to replace a 75 watt amp? Well, because I can? Honestly, I wanted to choose popular models and have flexibility to use them in different applications in the future. Plus, I thought you guys would want to see these models tested, so I did this for you!
See the Dayton Audio SPA250 here: http://amzn.to/2qFXC8h
Read reviews on the PE site here: https://goo.gl/ZfAViB
See the Yung SD300 here: http://amzn.to/2qLX4Om
Read reviews on PE: https://goo.gl/B4DHWa
Thank you as always for supporting OSS via Patreon!