Does anyone care to ask an amplifier designer a technical question? My door is open.


I closed the cable and fuse thread because the trolls were making a mess of things. I hope they dont find me here.

I design Tube and Solid State power amps and preamps for Music Reference. I have a degree in Electrical Engineering, have trained my ears keenly to hear frequency response differences, distortion and pretty good at guessing SPL. Ive spent 40 years doing that as a tech, store owner, and designer.
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Perhaps someone would like to ask a question about how one designs a successfull amplifier? What determines damping factor and what damping factor does besides damping the woofer. There is an entirely different, I feel better way to look at damping and call it Regulation , which is 1/damping.

I like to tell true stories of my experience with others in this industry.

I have started a school which you can visit at http://berkeleyhifischool.com/ There you can see some of my presentations.

On YouTube go to the Music Reference channel to see how to design and build your own tube linestage. The series has over 200,000 views. You have to hit the video tab to see all.

I am not here to advertise for MR. Soon I will be making and posting more videos on YouTube. I don’t make any money off the videos, I just want to share knowledge and I hope others will share knowledge. Asking a good question is actually a display of your knowledge because you know enough to formulate a decent question.

Starting in January I plan to make these videos and post them on the HiFi school site and hosted on a new YouTube channel belonging to the school.


128x128ramtubes
@bdp24 - where can I find that B4 crossover kit you referenced. Haven’t been able to locate it on the Internet.
Clio

The B4 is a First Watt product, it is a stereo active crossover with adjustable frequencies, slopes, and level, uses Jfets with no feedback.
@clio09, I read awhile back on a DIY forum that the assembled First Watt B4 was being discontinued, and Nelson was by that time providing info on the kit version. I just looked on the First Watt site, and the B4 is still listed. That doesn’t necessarily mean it is still available, of course, but give Reno Hi-Fi a call, maybe they have one left. It retailed for $1500.
Yes was aware it was a First Watt product just never saw it advertised as a kit. Nelson does have a crossover kit on the DIY Audio store but it's an analog version of the digital crossover used by Ziegfried Linkwitz, who asked Nelson to design it. I actually have the stuffed boards for this crossover as Nelson made them available at the recent Burning Amp.