2. amps-preamps
  3. 140029-80294

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
ffzz
5 posts
 
My speakers are 93db sensitive (1w/1m) with 8 ohm impedance (7ohm min).

With a listening distance of 8 feet, it seems 15w will be more than enough to produce 100db or so loudness that Symphonic music peaks into from time to time.

Assuming 100db is my max need, will there be any advantage of using, say, a 30w amp rather than a 15w amp? What if the amp is class AB rather than A?






ieales's avatar
ieales
297 posts
 
Please elaborate. I don't how the shorted lead drives no current?

A cross-coupled opamp circuit wherein shorting one of the leads to 0V removes its drive. It was very common in the 70's & 80's. Later Analog Devices created monolithic driver with similar functionality and much better performance due to tighter on chip resistors and thermal tracking than discrete parts. Sorry I don't have examples or numbers.

I would think the screen should be connected at both ends and the negative leg to the RCA body.
I was speaking of Balanced like XLR. Single end Dual wires inside a screen should have the screen connected to the body at the driving end only and the -ve lead connected at both ends.
tinear123
29 posts
 
Richard... I am enjoying the heck out of this forum and am learning quite a lot.  I am interested in your thoughts and insight into Bob Carver’s latest tube amps 
larry5729's avatar
larry5729
65 posts
 
What do you think of Parasound’s new integrated amplifier?
stargazer3's avatar
stargazer3
75 posts
 
Not sure if this has been covered on this thread.  In regard to BiWiring speakers from the amplifier, does this seperate route of connection in general improve the sound of the speakers or is it just one of those HiFi myths (pure BS?).
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