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.


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Krelldreams, I use an Luminous Axiom II, Walker Mod, 3 rca in, 2 rca out, with remote, and I feel it does not have a sound of it's own. $1249. retail. Tim Stinson from Luminous spent a lot of time with me on the phone, and I could not be happier. Enjoy ! MrD.
Is the Russian 6N30 (6H30) a copy of the 6CG7/6FQ7 dual-triode 9-pin base? I suspect it is! And not some secret "super" tube as claimed by ARC and others! Plate voltages and GM appear similar.
Are the pin-outs identical? If so, then the 6CG7/6FQ7 would make a cheaper substitute for the pricey Russian tube!
I have found more data on the 6N30 tube. Same pin-out as 6DJ8 and 6CG7. Plate dissipation 7 watts max. Plate voltage max at 250. Looks like the 6CG7/6FQ7 will work! 
Also plenty of choices for the 6N30 - from low-to-high prices (Saratov-made DR versions). Shame on ARC and others calling it a "super" tube - and boosting the prices for the gullible!