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Old 11th August 2012, 10:01 PM   #911
sonnya is offline sonnya  Denmark
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I Think Joachim is on the right track , i also believe that this is due to energy storage. We try to thermally compensate the front end. That is a weak point in a SSA front end but also in a diamond buffer.

The Working point is only changed by a small amount in the TSSA. Delta vbe/1k where the SSA have a delta vbe/100. The SSA has a change in the Working point of a 10 factor compared to the TSSA .

We Can compensate the change in Working point thermally, but it is fast enough? Even when the transistors are on the same die?
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Old 11th August 2012, 10:04 PM   #912
Jay is offline Jay  Indonesia
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Originally Posted by mikelm View Post
mmmm - those 10W figures are higher than I expected - almost in valve amp land.
I'm curious how it looks in simulation. Standard source follower versions do not have this character. Thanks to Sonny to make the CFP driven by BJT (so I can build it also).

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Originally Posted by MiiB View Post
but sonny's amp plays the music in a better way. It simply makes more sense.

some of this special magic that Sonny's amp has.... could be the Drain output, that holds the magic..??
Yeah, it could be both the Drain output and also harmonics that is caused by FET?

Drain output tend to sound relaxed and musical, but doesn't need to have high harmonics.

High harmonics tend to sound sweet in the mid-high, I guess it is caused by the "imbalance" between NJFET and PJFET so can be fixed/trimmed for those who prefer clean amp?
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Old 11th August 2012, 10:48 PM   #913
mikelm is offline mikelm  England
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I'm sure that several different factors are combining to create the good sound of this amp but a very significant one for me is what must be the exceptionally good stabilty of a two stage design.
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Old 12th August 2012, 11:58 AM   #914
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Hi LC, i just finish to populate my own Brother of quasi pcb : Brother of Quasi.

So I will have soon more time to go foward on my TSSA-BIGBT HP project. I mesure all BC on DMM as the KSA/KSC. Need to purchase TLP627 and some 1 wima. I will probably direct go for separated first stage own power supply. LC have begun the step by step guide you talken from?

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Last edited by Idefixes; 12th August 2012 at 12:26 PM.
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Old 12th August 2012, 01:57 PM   #915
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Hi Marc

Long time no see hehe

Well, just say when and will go on step by step. For the start post your current version of TSSA sch and pcb.

Regards, Andrej
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Old 13th August 2012, 12:35 AM   #916
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darTZeel NHB-458 monoblock amplifier Measurements | Stereophile.com
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Old 13th August 2012, 09:37 PM   #917
sonnya is offline sonnya  Denmark
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Just a sample shot.

The case is from hifi2000

Just to get an idea of how it should be assembled.

But you cant get to the nuts in the bottom of the case!!!!!

But now i know what i should do other way around.

I still misses the fuse drawer.. It arrives tomorrow.
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Old 13th August 2012, 10:31 PM   #918
sonnya is offline sonnya  Denmark
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After i have changed the drivers to bipolar, it sounds like the base has improved.

Also the dual mono setup is done.

I was listening to Ludovico Einaudi "The Tower". First i think, this cannot be right. It sounds distorted - Wrong... The attacks on the drums was extreme..

Melody Gardot - The hearts is black as night... Piano deep tones has more attack..

But i am not sure as, i am not as trained as you Michael.
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Old 14th August 2012, 01:16 PM   #919
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Originally Posted by Joachim Gerhard View Post
Interesting write up by the magazine, I see the designer is now using circuitry he rubished when he made the model one. I read the other day a interview with him by a hifi magazine some years back where he states that it took him 16 years to develop it and how bad some of the circuitry that has now gone in into this new model is and found it very amusing.

What he doesnt tell you is that all he did was to copy a old 1978 Revox design, take the feedback out from the output and present his new design. How he was allowed to patent his complete amp is another mystery as his input stage was used by Revox and public knowledge.
He did mention that he knew one of the designers from Revox pretty well, thats explains most of it.

There are some really interesting characters involved in audio.
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Old 14th August 2012, 01:55 PM   #920
sonnya is offline sonnya  Denmark
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And it so damn expensive....
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