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Old 19th November 2012, 08:31 PM   #31
GregH2 is offline GregH2  Australia
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meanman,

I think we could get a pretty decent sound for you by using an IRF9610 as the input, biased at 20mA and on the main heatsink. Then for a VAS I would use an IRF610 biased at 50mA and also on the main heatsink. For the VAS CCS I would use a single DN2540 mosfet without the bootstrap arrangement, also on the main sink. For the output 3x lateral mosfet pairs.

The only problem would be DC offset which would take a long time to stabilise as the heatsink heats up. However, this is less of an issue than some make out IMO. If it really bothers you we could devise a servo scheme.

Running the IR devices at high currents and voltages will make them sound better.

I made quite a few versions of fetzilla using a ZVP3310A/ZVN3310A mosfet as the input device and it sounded as good as the jfet IMO. A bit different, but equally good. More lively perhaps.
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Old 19th November 2012, 08:39 PM   #32
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Greg,Just do what you think is best.What do you mean with a long time?
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Old 20th November 2012, 04:15 AM   #33
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Default Because of Hugh i will not comment Bigun

Respecting a very good friend..but i have sent you direct message about.

About the Blame ST..... Super A have eated it.....so, if Zilla matches, then will have to face the Dx Super A.

there's a problem when we compare high end amplifiers..they are already touching the "roof"....how to be higher than the roof?

Maybe matched speakers can do that.... giving advantage to one or other, i cannot see other logical possibility.

regards,

Carlos
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Last edited by destroyer X; 20th November 2012 at 04:19 AM.
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Old 20th November 2012, 09:21 AM   #34
Jay is offline Jay  Indonesia
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Quote:
Originally Posted by destroyer X View Post
there's a problem when we compare high end amplifiers..they are already touching the "roof"....how to be higher than the roof?

Maybe matched speakers can do that.... giving advantage to one or other, i cannot see other logical possibility.
The level of knowledge in this forum is too high to be underestimated/bullied.
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Old 20th November 2012, 10:26 PM   #35
Bigun is offline Bigun  Canada
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Originally Posted by destroyer X View Post
Respecting a very good friend..but i have sent you direct message about.

About the Blame ST..... Super A have eated it.....so, if Zilla matches, then will have to face the Dx Super A.

there's a problem when we compare high end amplifiers..they are already touching the "roof"....how to be higher than the roof?

Maybe matched speakers can do that.... giving advantage to one or other, i cannot see other logical possibility.

regards,

Carlos
I don't think Hugh would be shy about any comments - he may in fact get rather too much fun out of the discussion !

Anyhow, not so much a question of which is better, that is a question that isn't useful - but rather a question of how they are different. Two reasons to ask, a) we can learn how different design choices can affect the sound, b) we can learn which designs might suit our own listening preferences, sources and speakers.

Now DX, you have made a Class A amplifier, this is very interesting for me because many years ago you did not have a good opinion of Class A that you had tried so now you must have something special...
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Old 21st November 2012, 02:14 AM   #36
AKSA is offline AKSA  Australia
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Carlos,

Bigun is right; I'm just fine with all these comments, I look at good circuits from thing every day, including your designs! I don't much contribute much, but I'm still very interested in DIYaudio and visit every day. I'm most grateful for the privilege of being a member here, in fact.

Cheers,

Hugh
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Last edited by AKSA; 21st November 2012 at 02:16 AM.
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Old 21st November 2012, 08:21 PM   #37
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Default It is all rigth to me Hugh...you know i have a lot of respect dedicated to you

You know much more than i know about amplifiers...i have learned a lot from you.

It is not a problem if your amplifier beat mine one...because mine one is not even mine..it is more Blameless than mine..the philosophy, the idea behing the circuit is from Self.

I am just so well impressed with this last model that i really do not believe someone can beat it...maybe match, a even result..but beat it is something i really do not believe.

But, as i do not earn any money with my amplifiers, i am not a professional, it is for fun, i would have no problems to say the one is better without any problems about.

I have not listened this Zilla..... but if one day i listen to it, and perceive it as better, will say to everybody...will scream to the whole world, will be advertising your amplifier and will send mine to junk and also will say my friends and builders to make yours..

I have a proposal...send me one...just one...then i gonna test it and compare and will be fair, will be 100 percent honest....and as i do not earn money i will do the following.

If your amplifier beat mine..then i will make a huge noise wide world, will ask my builders to build yours...will say mine was defeated and will be advertising yours, and for free.

But if happens the opposite..then i will be silent..no coments about i have beated yours..if this happens.

As people will never know if you sent me or not..then the silence will be to defend our old and strong friendship.

No one will know.... even bigun will not know..will say nothing..you say nothing.

So....only advantage to you.

I can kill my designs..no one have paid for them...so...i have just to point the one is better...and people cannot complain.

Carlos Eugênio Bezerra Mergulhão
Rua Dona Balbina Menelau 56 - 1601
Candeias - Jaboatão dos Guararapes
Pernambuco - Brasil - South America
54440-615

But i repeat...once and once again...no one can beat this one i have now a days...i do not believe this is possible!

Deal made?

Carlos
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Last edited by destroyer X; 21st November 2012 at 08:36 PM.
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Old 21st November 2012, 08:37 PM   #38
AKSA is offline AKSA  Australia
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Carlos,

I'm very sorry but I have no pcbs left over; in fact, I do not have a FetZilla either, it was sold. And this schematic was created by Lineout, then developed with Greg and Mike, not me, although I had some influence during laying out the pcb and documentation. There was significant input (the hybrid CCS) from a very clever engineer in Melbourne, Paul Bysouth.

There may be a #4 group buy, however. I am discussing it with a guy in Belgium and I am seeking permission from Greg and Mike, who did the hard yards and due respect.

I admit I was surprised that the FetZilla was so good. It's laughably simple, so integrating the power supply rails made it a very neat package, and I sold nearly 200 pcbs around the world. It presents almost a tube sound, which reflects low loop gain and lateral FETs in the output stage.


Ciao,

Hugh
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Old 21st November 2012, 08:45 PM   #39
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Default I see Hugh....so, there's no problems of consciousness to myself

about it...good that it is not yours my dear friend.... i do not want to bother you..and my amplifier would eat this one easy.... it is extraordinary Hugh.

Do you know... i also do not have pcboards left from some designs.

So.... forget the whole stuff...the proposal was for you... and only for you. as it is not yours...proposal removed!

Receive a big hug my dear friend...God bless you and keep you healthy for more 15 years (minimum)

I am removing myself from this thead, to avoid comments about..to let the thread go ahead in perfect harmony.

regards,

Carlos
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Last edited by destroyer X; 21st November 2012 at 08:48 PM.
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Old 21st November 2012, 09:19 PM   #40
Jozua is offline Jozua  South Africa
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Carlos esq

I am certain your amps are excellent.

What we should rather be testing is - if possible (?!!) is how much subjective enjoyment we have with our 'favourite' amps and how much money we have wasted in our search for audio nirvana?

Hugh- My Fetzilla is nearly done.... maybe by the end of 2012. I am curious to see how it compares with my other high maintenance "children".

Low cost and easy to repair circuits that sound good is now very much on my agenda.


Regards

Jozua

Last edited by Jozua; 21st November 2012 at 09:26 PM.
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