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In Reply to: RE: Linearity posted by Triode_Kingdom on September 11, 2014 at 13:08:21
One-note samba.
I am not so concerned with just ONE theoretical aspect of a tube amp's design ... which you would want to focus upon.
This is an amp that will operate 99% of the time at 100 to 500 milliwatts of output power on 100 dB plus sensitive speakers.
You certainly are not trying to be helpful, you are just trying to criticise me personally, which you have done repeatedly over the years whenever you think you could get away with it.
Best wishes,
Jeff Medwin
Follow Ups:
"you are just trying to criticise me personally"You couldn't be more wrong. I would have asked the exact same question of any inmate who suddenly announced they were going to build a SET with the 6AH4. If you like the sound of this tube, fine, but that's no reason to lash out at people who ask a simple question about how it will be applied.
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Buy Chinese. Bury freedom.
Edits: 09/11/14
OK T-K,Well then, I apologize to you. You have posted negatively about audio things I do in the past, over many years now, and it caused me to over-react.
Yes, I do like the way this tube sounds. Yes, I do not get too upset at all about its curves, the transfer characteristics doesn't "tell all" to my way of thinking. Yes, I want to build a SE DC amp with this in the finals position.
I am motovated by two things T-K.
First, and foremost, in 2013 I listened to a two stage DC Push Pull amp ( designed and hand-built by the late Arthur Loesch - used the same tube types I intend to use ), and I LOVED the way it sounded to me. Mesmerizing.
Second, some of the builders on-line ( experienced, respectable individuals ) have used this tube, typically in a line level preamp, and they too much like what they heard. Names were referred to in another post in this thread.
Thats all, there are no guarantees when you do a new design, but the proof of the pudding...blah, blah, blah, ....is NOT just the load line !!!
This will, to the best of my knowledge, be the first single ended triode two-stage direct-coupled amp with 6AH4s as the final tube, and additionally, it employs what I call a "modern power supply". These factors alone make me wanna get off my butt and build it, just to hear it !! Its fun. Give me a couple of months and I will know more !!
I'll post photos as I go along as some like to see them.
Jeff Medwin
Edits: 09/11/14 09/11/14
Jeff, I'm always interested in seeing how other people build their gear. And the fact is, some have used tubes with curves that look worse than the 6AH4, and they seemed to like the results. One that comes to mind is the 1626. I wondered for years how a tube with such awful curves could produce a decent amp. The answer is that it doesn't, unless one is willing to overlook the flaws indicated by the curves, which do indeed reach the output of the amplifier. I arrived at that conclusion after one of the users finally made a measurement and posted the results:
Realizing how poor this performance is, the builder even remarked that it's nothing to worry about. Most of it is 2nd harmonic, which "can be accepted by human ears."
My point is, Jeff, that if this is the sort of amplifier you're building, that's fine by me. Personally though, I can't stand listening to designs that produce so much distortion, even when its 2nd harmonic. So, when I see something that seems amiss (like the 6AH4 curves), something that will likely produce an amplifier I wouldn't want to listen to myself, I ask questions. Simple as that.
Keep up posted on the progress!
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Buy Chinese. Bury freedom.
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