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.
.
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.


ramtubes

Showing 1 response by johnlnyc

johnlnyc's avatar
johnlnyc
59 posts
 
OK--could use some advice. I am currently using a Krell KST-100. (solid state) Amplifier since around 1992. I think age is setting in--getting first signs via noise/static like through speakers. I have isolated the Krell.

What can I expect to pay for a recap (plus any normal servicing)? I can actually drop off the amp at Krell myself (they are an hour or so away).

Now part two (which impacts part one)
My pre amp is a Conrad Johnson Classic II. Output is 200ohms.
The Krell input 47K--despite this, I am using an attenuator before the amp inputs.

So--do I recap and refurbish my Krell (a great amp) or do I switch to another amp (I like the solid state CJ's for around $2-3k). 
Thanks!
More to discover