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

I forgot the great Leak and Quad amps, low powered but wonderful
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They are indeed. The Leak is a rather standard circuit as I recall. However the QUAD 2 has a very interesting circuit. Unique, thoughtful.

I sell more of my 35 watt than my 100 watt amplifier. I also get calls for the little EM7 2.5 watt single ended. How can some do with so little power and others "think" they need all those watts? Truth is nobody measures and the majority guessing are way off.

These older amps may be low powered in todays numbers but adequate for listening with reasonable speakers. I saw a 190# SS amp for sale here for $40,000. Now who needs that.
Roger, there is a current Audiogon thread inquiring about the Dynaco ST70. I posted that for the same money one could get a used RM-10, a far better amp. If you want, find the thread and let the op know why ;-) .
can you find the thread. I had no luck.

Here you go:

https://forum.audiogon.com/discussions/st-70-best-sounding-version/post?highlight=dynaco%2Bst70&...

Someone asked about the differences between an RM-10 MkI and MkII so perhaps you can educate them. Also, the OP already uses an RM-10 in their main system and is looking at an ST70 for a secondary system.