Zen Mod Napisano Decembar 8, 2010 Autor Share #771 Napisano Decembar 8, 2010 lucky bstrdzI'm stuck with plain ol' F4:dash1: Link to comment Podeli na ovim sajtovima More sharing options...
Zen Mod Napisano Decembar 9, 2010 Autor Share #772 Napisano Decembar 9, 2010 Vlado - sp300b is interested ( and I'm asking just because he's busy all day long ) - can you make direct comparison of sound of FW J2 and your Babelfish J2 , considering all differences - you heard FW at Papa's , while you are listening yours at your place ..... we already have Tea Bag's opinion - " The BJ-2 sounds a lot like I remember the FW J2 sounding like at Burning Amp 2009 " tnx Link to comment Podeli na ovim sajtovima More sharing options...
zika Napisano Decembar 9, 2010 Share #773 Napisano Decembar 9, 2010 lucky bstrdzI'm stuck with plain ol' F4:dash1:And I'm on both of Your sides... Link to comment Podeli na ovim sajtovima More sharing options...
Tea-Bag Napisano Decembar 9, 2010 Share #774 Napisano Decembar 9, 2010 Vlad has had opportinity to hear the FW J2 for longer periods than the two tracks that I heard with it. So dont take my opinion seriously at all. And I think the speakers there may have played a big part in it.Some other words to describe it. Organic, dark, dynamic (unexpected). The soundstage sounds a bit less precise than F5. More atmospheric and wider and deep soundstage than F5. It is not dry sounding. It sounds 'dirty' compared to F5 or F2J 'clean'More tone than F5, and tone is darker than F2J, and Aleph type with R100. I think Generg could make a comparison here with the latter as well.Keep in mind, I plan on using 100R gates, and adding in other LED or Diode into Vref to bring up Drain voltage on 2SJ's Changing the diode sounds easier. . This may change things for better or worse. Link to comment Podeli na ovim sajtovima More sharing options...
sp300b Napisano Decembar 9, 2010 Share #775 Napisano Decembar 9, 2010 Vlad has had opportinity to hear the FW J2 for longer periods than the two tracks that I heard with it. So dont take my opinion seriously at all. And I think the speakers there may have played a big part in it.Some other words to describe it. Organic, dark, dynamic (unexpected). The soundstage sounds a bit less precise than F5. More atmospheric and wider and deep soundstage than F5. It is not dry sounding. It sounds 'dirty' compared to F5 or F2J 'clean'More tone than F5, and tone is darker than F2J, and Aleph type with R100. I think Generg could make a comparison here with the latter as well.Keep in mind, I plan on using 100R gates, and adding in other LED or Diode into Vref to bring up Drain voltage on 2SJ's Changing the diode sounds easier. . This may change things for better or worse.Tea-Bag ...just for curiosity..You are talking about F2 J with SS, not BJ2 - correct ? Link to comment Podeli na ovim sajtovima More sharing options...
Sipi Napisano Decembar 9, 2010 Share #776 Napisano Decembar 9, 2010 Tea-Bag ...just for curiosity..You are talking about F2 J with SS, not BJ2 - correct ? Of course - he said "atmospheric", BJ2 is "panoramic"... Link to comment Podeli na ovim sajtovima More sharing options...
generg Napisano Decembar 9, 2010 Share #777 Napisano Decembar 9, 2010 When tazzz made his FW J2 conehttp://www.diyaudio.com/forums/pass-labs/151909-firstwatt-j2-53.htmlI changed a few mails with him. He tried to be closer to Nelsons circuit, but he stated"Thanks for your description. I have not played with the gate stoppers but simply put 47ohms resistor there I changed the current running through my voltage source tough for the upper jfet and that changed things considerably! Its still warming up as Im writing this but I can hear how much sweeter the top end is now... remarkable really. If you still want to play with your amplifier look up the articles about impedance multiplier at tubecad.com. There you will see that the upper pair of current sense resistors should take into account the transconductance of the upper Jfet and hence one should be made slightly smaller to compensate for the this and set the ratios right, than the other three resistors."I think some of you will understand the last part, not me...... Link to comment Podeli na ovim sajtovima More sharing options...
sp300b Napisano Decembar 9, 2010 Share #778 Napisano Decembar 9, 2010 Of course - he said "atmospheric", BJ2 is "panoramic"... Juma...juma...better tell me Your opinion about this shunt Link to comment Podeli na ovim sajtovima More sharing options...
sp300b Napisano Decembar 9, 2010 Share #779 Napisano Decembar 9, 2010 I think some of you will understand the last part, not me...... generg, would you mind Inviting him to come here and share his experience - We are welcoming him Link to comment Podeli na ovim sajtovima More sharing options...
Zen Mod Napisano Decembar 9, 2010 Autor Share #780 Napisano Decembar 9, 2010 Juma...juma...better tell me Your opinion about this shunt take money and run type Link to comment Podeli na ovim sajtovima More sharing options...
generg Napisano Decembar 9, 2010 Share #781 Napisano Decembar 9, 2010 I invited Mikael ....... Link to comment Podeli na ovim sajtovima More sharing options...
Sipi Napisano Decembar 9, 2010 Share #782 Napisano Decembar 9, 2010 Juma...juma...better tell me Your opinion about this shuntNece raditi lose... Sa'ranili su gomilu delova gde ne treba,a na dva mesta ima manjak - al' to je komercijalni, potpisani uredjaj, ne bih da se dublje brkam u to... Link to comment Podeli na ovim sajtovima More sharing options...
sp300b Napisano Decembar 9, 2010 Share #783 Napisano Decembar 9, 2010 I invited Mikael ....... Very good. At first glance, seems that idea is to have Upper JFet biased with larger current and to use lower resistor in his sourse. Not exacty clear at this stage to me Link to comment Podeli na ovim sajtovima More sharing options...
Zen Mod Napisano Decembar 9, 2010 Autor Share #784 Napisano Decembar 9, 2010 nope - he meant changing value(s) of middle resistors in output stagewe have 2x0R5 in series ......changing them - you are changing modulation of upper half of totem poleit is impossible to have unequal currents through output vertical . except if you make another path for equalizing currents in that pole Link to comment Podeli na ovim sajtovima More sharing options...
sp300b Napisano Decembar 9, 2010 Share #785 Napisano Decembar 9, 2010 nope - he meant changing value(s) of middle resistors in output stagewe have 2x0R5 in series ......changing them - you are changing modulation of upper half of totem poleYou mean, for example to put one 0,22 and other 0,78 for example instead of 0,5 and 0,5 ? What about offset ? Link to comment Podeli na ovim sajtovima More sharing options...
Zen Mod Napisano Decembar 9, 2010 Autor Share #786 Napisano Decembar 9, 2010 You mean, for example to put one 0,22 and other 0,78 for example instead of 0,5 and 0,5 ? What about offset ?you have diff input stage to servo thatno difference in thatjust one thing - I'm pretty satisfied with Babelfish J2 as is now ........ just need to make it in box , one day ..... Link to comment Podeli na ovim sajtovima More sharing options...
sp300b Napisano Decembar 9, 2010 Share #787 Napisano Decembar 9, 2010 you have diff input stage to servo thatno difference in thatOk - LTP - zero - clear, but it is not possible to have let's say 2,4 A in upper Jfet, and 1,5A in lower Jfet in our schematic - correct ?- if we imagine schematic without speaker connected.... Link to comment Podeli na ovim sajtovima More sharing options...
Zen Mod Napisano Decembar 9, 2010 Autor Share #788 Napisano Decembar 9, 2010 Ok - LTP - zero - clear, but it is not possible to have let's say 2,4 A in upper Jfet, and 1,5A in lower Jfet in our schematic - correct ?- if we imagine schematic without speaker connected....seems that your thinking apparatus is these dayz in ZM mode :rofl:we must include path where we can direct 900mA of differencebut - not in speaker , please :rofl:so - this isn't modern Pass SUSY amp , with introduced additional SE bias Link to comment Podeli na ovim sajtovima More sharing options...
sp300b Napisano Decembar 9, 2010 Share #789 Napisano Decembar 9, 2010 seems that your thinking apparatus is these dayz in ZM mode :rofl:we must include path where we can direct 900mA ....... but - not in speaker , please So, how it's possible....I also think it's not possible in our schematic... Link to comment Podeli na ovim sajtovima More sharing options...
generg Napisano Decembar 9, 2010 Share #790 Napisano Decembar 9, 2010 just one thing - I'm pretty satisfied with Babelfish J2 as is now ........ just need to make it in box , one day ..... it is really difficult ...... I never heard the original FW J2, but for me and my damned Thiel speakers ( I like them nevertheless) the highs of Babel J2 were perfect, the bass was overwhelming and the sound "panoramic" (ha,ha) .....and the only thing I wanted was softer medium area, hearing that J2 had so wonderful medium area. that means I can share the wish of AR2 to have a little bit more medium bass or what were his words? that shows how dependent all the impressions are of the rest of the chain. Dear Zen Mod it would be very nice of you could give us some hints how to tune sound in your opinion in one or other direction. Like you did when developing pumpkin. and don´t forget your name is program: Zen Mod and we all want to MODMODMODMODMODMDO till we get ZENZENZENZEN..... best for you Link to comment Podeli na ovim sajtovima More sharing options...
Zen Mod Napisano Decembar 9, 2010 Autor Share #791 Napisano Decembar 9, 2010 @sp300b: why should that be possible ? it is , but I can't see why - put either power resistor from output to negative PSU leg , or CCS that way - with introducing additional current path - you can diss-balance currents through output pair Link to comment Podeli na ovim sajtovima More sharing options...
Zen Mod Napisano Decembar 9, 2010 Autor Share #792 Napisano Decembar 9, 2010 ......you can try to change ratio of these resistors between lower and upper SS outputsnow they're 0R5 and 0R5increase upper/decrease lower (in same amount) - more local degeneration of upper SS - comparing to output node - where is - important - tied feedback netincrease lower/decrease upper (in same amount) - less local degenaration .......dunno what results - sound wise - can be ...... Link to comment Podeli na ovim sajtovima More sharing options...
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