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Old 5th January 2012, 04:58 PM   #571
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Hysteresis?
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Old 5th January 2012, 05:12 PM   #572
a.wayne is offline a.wayne  United States
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Hello T,

Thanks for the response, are you affiliated with Allnic? could you be more specific about the stereophile article you want me to look at...



Regards,
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Old 5th January 2012, 05:14 PM   #573
DF96 is offline DF96  England
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A system with hysteresis could still be monotonic. Given that most amplifiers are only weakly non-linear below clipping I would expect few to be non-monotonic, but maybe Thorsten has seen some which are not.
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Old 5th January 2012, 08:21 PM   #574
Cassiel is offline Cassiel  Libya
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Quote:
Originally Posted by ThorstenL View Post
Hi,

In addition I'm a little like tvrgeeks wife, there are some qualities in reproduced music that I find make want to almost run from the room screaming. I find this quality physcially uncomfortable.
Some pentode amps make me sick, literally. If I don't stop listening something really bad is going to happen. There's no apparent distortion, in fact they fool me for a couple of days thinking they sound very lively and then all of the sudden I go mad....check my meds....all in order....it's got to be the new amp and it was. I had this idea once about using triode amps in mental institutions, I believe it would be much more effective that that lame idea about 'happy' cell's walls colors.
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Old 5th January 2012, 08:55 PM   #575
tvrgeek is offline tvrgeek  United States
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Thorsten,
Much thanks on specifics of the Rotel topology. The 5532 is the phono stage, so it's not involved at all. I find her acceptance of the Rotels interesting because as I suspected, they are well thought out, but built with consumer mass production parts and tradeoffs. I have the 840 schematic, but not the bigger ones. I wonder what my little Creek does?

The above discussions on various feedback methods has been quite informative. I hope my Amazon book order gets here soon, not that I can get a slightly better grasp what you are talking about. I love learning all I can. I can now take a look at the Rotel vs the Hafler schematic and see this for my self. All I had before were the glossy page sooth-sayers hyperbola on topology. I suspect few of them ever designed an amp. So, what I learned today is yes, the topology is different and more specifically in the method of feedback. It is now up to me to reverse engineer the Rotel vs Hafler and do the numbers. Obviouslly, bipolar vs Mosfet outputs.

I have this Aimor integrated that sounds like ****, so it would be real low risk to play with it. No schematic of course. I don't know if they painted over part numbers like some do, so drawing it out may not be too hard. Done worse. Good solid chassis, transformer and heat sinks, so that is most of the cost to do a DIY.

I am trying to soften up my local distributor to borrow a Halo.
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Old 5th January 2012, 09:15 PM   #576
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Quote:
Originally Posted by ThorstenL View Post
Hi,

Yes. It is sound I like. I like sound that seems to blurr the boundary between illusion and reality. It is NOT about Bass or treble or midrange or space/sound stage.

I have for example heard some british solid state systems (not Naim) with crazy French speakers that did the "blurring of boundaries" superbly well, though they for me at least induced unacceptable colourations on some music, despite sounding somehow a lot like live and they had a soundstage as flat as a chinese pancake (the one you get with the imitation peking duck they serve in gwailo chinese chop shops).

Ciao T
Hello Thorsten

Would you name this sound involving or engaging ?

The TDA1541 do have this sound and that's why it made it so special.

Bye

Gaetan

Last edited by gaetan8888; 5th January 2012 at 09:33 PM.
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Old 5th January 2012, 09:42 PM   #577
tvrgeek is offline tvrgeek  United States
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Fishy schematic. I was looking at the RB840 schematic. It has a few things I had not seen. The fuse on the output is bypassed with a 33K resistor. I guess that is for safety, but have never seen it before. Global feedback is from post fuse through 43K. Here is the odd part, I wonder if put in the drawing just to mess someone up. A 2.2K resistor in series with the output. Then followed by a .22 and the Zobel. I''ll have to pull it apart tosee what is really there. Dual outputs. Surprised, I guessed singles for a 30W amp.
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Old 5th January 2012, 10:51 PM   #578
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I have not seen your schematic, but according to your description the amp's feedback loop includes output fuse because fuse adds thermal distortions: it's temperature depends on current, and resistance depends on temperature. Resistor in parallel with it is to provide feedback loop when the fuse is blown or removed.
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Old 5th January 2012, 11:11 PM   #579
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Well said, Wavebourn.
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Old 5th January 2012, 11:30 PM   #580
tvrgeek is offline tvrgeek  United States
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That makes sense, keep the feedback. The odd part is the 2.2K is series with the output. It has to be incorrect. I'll try to scan the portion.
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