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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Showing 2 responses by baranyi

Roger, 
           Thanks for this great thread! It is one of the best threads I have ever read on this website! Your time educating us non-technical prople is greatly appreciated. I still own the original Beveridge Model 2׳s and have a couple questions after reading your earlier comments about these speakers. You mentioned in an earlier post that the perfect room for these speakers is one that is 11’ W by 24’ long. You mentioned that they needed to be at least 6 feet from the rear wall facing each other. Then you commented on their amazing imaging saying that they should be 2 times 6ft or 12 feet area for imaging. Were you just saying that both speakers were 6 feet away from the rear wall or were you saying the speakers should be pulled 12 feet from the rear wall in this perfect room?

The original Beveridge amplifiers uses solid state inputs much like your RM-200. Is this because the high voltage needed for the speakers? It These Beveridge amplifiers weakness is their power transformers which I have had a few go bad on me. For this reason I keep a stash of these amps. Could you recommend a source for rewinding these power transformers because Jack at Electroprint has very little interest because of the enormous demand on the power transformer. Could you comment on this? I believe you might have come up with a work around for this issue. 
 Lastly, i have stayed away from your RM-1 (and RM-2 Power supply) Beveridge preamp because I have been told that the preamp is very hard on tubes used in it. This seems very much counter to your later works. Is this true or myth about the RM-1/2? If so, is there a later fix for this issue or should I just buy a later preamp of yours. I have used many preamps with the Beveridge 2’s. Currently I am using an old PS Audio 4 preamp in the passive mode. I obviously am
a fan of your work!
Roger,
          Thank you for the comments about Beveridge speakers. Could you also make some mention about the power transformer of these direct drive amps?  Should it be so difficult to find a source to rewind these transformers making the amplifiers operational again? I have had 4 amps where this is an issue (in both Beveridge 2 and 2sw amps.) My original pair model 2’s had this issue upon purchase (long story.)

This power transformer issue and panel issues seem to be what keep these speakers from being more highly coveted today. Thanks again for your generous participation on this thread.