Thanks! I will check it out latter this afternoon and report back as to how well it works for me. Joe in Virginia

Yes, I fully intend to do the Cascode front end as well as the other mods you suggest. They and the tube swap should be enough to make a very nice sounding 300B amplifier on my Klipsch horns. Joe in Virginia

I will be doing the cascode modification last and report back as to my impression of the sonic response improvement. I am also playing around with the idea of tearing out the entire preamp front end section and driving the 300B tubes directly from a very clean tube preamplifier. I have not looked into this too deeply yet to see what the downside will be. The tube preamp I may use is capable of providing about 10 volts of very clean power. Any thoughts? Joe in Virginia

Yes, that part I was able to figure out. The only thing so far that I have not been able to setup is a swept frequency response over the audio range that shows distortion. Joe in Virginia

Thanks! I will download it and play with it over the weekend. Hopefully all works well and I do not have any questions. Regards - Joe in Virginia

Thanks! It has taken a number of years to build my collection of Dumortier tube gear and even more to accumulate all of the DIY parts I have in my basement. Now, my challenge is to find homes for 80% plus of the stuff in my basement as I work towards simplifying my life and ensuring that I do not leave too much of a mess for my family to deal with when the time comes. I purchased an A12 and was surprised how good it actually sounded right out of the box. I think someone at the company has been looking at your videos and has taken steps to improve the design for better performance. I am sure there are may thing I will be doing to further improve what is a real bargain for those interested in the hobby. I was so impressed with the looks and physical build quality that I just ordered an A50 before they start going up in prices. Please feel free to contact me at any time should you feel I may be able to assist you in any was as you continue with your projects and great videos. Joe in Woodbridge, VA www.dumortier-us.com. PS - Should anyone be interested, there is a great electronics training course on my website produced by the U.S. NAVY under the tab "NEETS". It is free and very comprehensive.

Hi JB: I too live in Virginia in the Woodbridge area. Please feel free to contact me if like? Joe Lenyi - Woodbridge, VA