Tea-Bag Napisano Decembar 12, 2010 Share #859 Napisano Decembar 12, 2010 turn back R25 to zero , increase value of R26 for max 220R ( from 390 to ,say, 610-620 (whatever you have in drawer) ) ; turn R25 up , to have 0 offset set both Iq and offset - fiddling iteratively with R12 and R25 Tea - these are simple things if you can't do it easily on Sunday afternoon - leave it for tomorrow These are simple things So I am at 680R for R26, and best offset so far is achieved with R25 at max, R12 at min. Are you suggesting I try 220R for R26? Sorry if I am coming across as dumbass. (true nature) Link to comment Podeli na ovim sajtovima More sharing options...
generg Napisano Decembar 12, 2010 Share #860 Napisano Decembar 12, 2010 good news...after half an hour the optocoupling device tracks the current precisely and offset is stable around 1mV plus minus 5mVeven at 1,4 A and 6 times o,25 Ohm!@tea-bag: good luck and I hope the sound will change in the direction you want! Link to comment Podeli na ovim sajtovima More sharing options...
Zen Mod Napisano Decembar 12, 2010 Autor Share #861 Napisano Decembar 12, 2010 ........ So I am at 680R for R26, and best offset so far is achieved with R25 at max, R12 at min. ........ completely logical and in line what I'm writing all the time .... Are you suggesting I try 220R for R26? ... nope - that will increase negative offsetwhat I said is " increase R26 for 220R" ...... Sorry if I am coming across as dumbass. not dumbass , but you're obviously working today without enough concentration Link to comment Podeli na ovim sajtovima More sharing options...
Tea-Bag Napisano Decembar 12, 2010 Share #862 Napisano Decembar 12, 2010 nope - that will increase negative offset what I said is " increase R26 for 220R" This still doesn't make sense to me. You mean R25 to 220R (max for it)?? My thinking tells me to use 1K instead of 680R, should get more wiggle room with R25 pot. 680R improved over 470R, which was improved over 390R original. OR I should try to swap R25 to 1K pot. This makes sense to me.... More resistance here has been dropping the offset, but not enough room to get near 0v. Link to comment Podeli na ovim sajtovima More sharing options...
Magura Napisano Decembar 12, 2010 Share #863 Napisano Decembar 12, 2010 nope - that will increase negative offset what I said is " increase R26 for 220R" This still doesn't make sense to me. You mean R25 to 220R (max for it)?? My thinking tells me to use 1K instead of 680R, should get more wiggle room with R25 pot. 680R improved over 470R, which was improved over 390R original. OR I should try to swap R25 to 1K pot. This makes sense to me.... More resistance here has been dropping the offset, but not enough room to get near 0v. Let me translate: Increase R26 for 220R = Increase R26 by 220R, as in "add 220R to R26" Magura Link to comment Podeli na ovim sajtovima More sharing options...
generg Napisano Decembar 12, 2010 Share #864 Napisano Decembar 12, 2010 One pair of SemiS sound much better than two pairs, maybe not closely matched enough........I am still a little bit fascinated by 6x 0,25 Ohm and 1,4A@sp300b I am too lazy today to change to your values ..... tomorrow......and the Aleph 3 has 60W on my 4 Ohm box and Babelfish J2 13W, of cause Aleph 3 seems in some aspects more impressive....I now change to the Sonidos and compare both amps (but only channel, I have no two complete amps) Link to comment Podeli na ovim sajtovima More sharing options...
Tea-Bag Napisano Decembar 12, 2010 Share #865 Napisano Decembar 12, 2010 Let me translate: Increase R26 for 220R = Increase R26 by 220R, as in "add 220R to R26" Magura Got it!! Link to comment Podeli na ovim sajtovima More sharing options...
sp300b Napisano Decembar 12, 2010 Share #866 Napisano Decembar 12, 2010 Got it!!Very good. Any impression about the sound after this change?Thanks in advance Link to comment Podeli na ovim sajtovima More sharing options...
Tea-Bag Napisano Decembar 12, 2010 Share #867 Napisano Decembar 12, 2010 Very good. Any impression about the sound after this change?Thanks in advanceWell, still working on getting it right, need to add a little more R to get offset lower.Then will need to work on the other channel. So I am not sure I will get a good listen for a few days now. Link to comment Podeli na ovim sajtovima More sharing options...
sp300b Napisano Decembar 12, 2010 Share #868 Napisano Decembar 12, 2010 Well, still working on getting it right, need to add a little more R to get offset lower.Then will need to work on the other channel. So I am not sure I will get a good listen for a few days now.OK. Easy - take your time. Link to comment Podeli na ovim sajtovima More sharing options...
generg Napisano Decembar 12, 2010 Share #869 Napisano Decembar 12, 2010 Hi sp300b,Only for your information, I was reading many sides about mufollowers, the one tazzz recommended gives the lowest value to the upper resistor, but most sides advice to make the resistor in the middle the highest.That was your preferred constellation. Tomorrow I will choose 0,25/0,47/0,25 nearly the same like you and possible with the values I have.The second channel will have the original constellation so I can compare easily...I simply wish more body all other aspects are very good... Link to comment Podeli na ovim sajtovima More sharing options...
sp300b Napisano Decembar 13, 2010 Share #870 Napisano Decembar 13, 2010 ...The second channel will have the original constellation so I can compare easily...Excellent !This will be real-time comparison.Eager to hear about the differences between 0,25/0,25/0,25 and 0,25/0,47/0,25:cheers: Link to comment Podeli na ovim sajtovima More sharing options...
generg Napisano Decembar 13, 2010 Share #871 Napisano Decembar 13, 2010 dear Zen Mod, is it possible that C3 and C4 are in the signal path from the lower to the upper JFet?does that mean we can influence sound a little bit by choosing different caps or bypass caps?I yes and if we all took different caps, it may explain a bit the differences in sound impression between "wodka" or "champaign"...... Link to comment Podeli na ovim sajtovima More sharing options...
Zen Mod Napisano Decembar 13, 2010 Autor Share #872 Napisano Decembar 13, 2010 yes - they are in signal path , but not so much influential as you hope :Viannen_loungelizard:10n MKC is my preferred bypass Link to comment Podeli na ovim sajtovima More sharing options...
generg Napisano Decembar 13, 2010 Share #873 Napisano Decembar 13, 2010 can you give an estimated percentage of the contribution of the upper part to the total output? Link to comment Podeli na ovim sajtovima More sharing options...
Zen Mod Napisano Decembar 13, 2010 Autor Share #874 Napisano Decembar 13, 2010 rephrase , please .which contribution - power or wellness of sound ? Link to comment Podeli na ovim sajtovima More sharing options...
generg Napisano Decembar 13, 2010 Share #875 Napisano Decembar 13, 2010 I meant contribution to the power..... what did you mean with wellness of sound (distortion cancelation?) Link to comment Podeli na ovim sajtovima More sharing options...
Zen Mod Napisano Decembar 13, 2010 Autor Share #876 Napisano Decembar 13, 2010 wellness , fitness , well being , quality of life , mu , 42 , Tendon of Sound , whatever :buehehe:don't make that mistake again , and read seriously what I wrote :sarcastic_hand:you remember how's measured AC gain (of Aleph CCS) in Aleph output stage ?pretty much the same - feed it with 400Hz sinethen measure AC voltage across lower SS source resistor ( R37 // R31 ), then measure across upper SS source resistor (R22 // R29)compareI didn't ...... Link to comment Podeli na ovim sajtovima More sharing options...
generg Napisano Decembar 13, 2010 Share #877 Napisano Decembar 13, 2010 thank you Zen Mod, you are really a good guy-de in electronics ......... I hope our many questions and trials of modifications do not bother you ........ these details are our playground .... and we all learn something ..........where are you playing along? Link to comment Podeli na ovim sajtovima More sharing options...
Zen Mod Napisano Decembar 13, 2010 Autor Share #878 Napisano Decembar 13, 2010 ........where are you playing along? rest of my day-time I'm spending as a Teacher of Modesty and Flying ....... so - you can call me High Flying Modesty ZM:rofl:(pick today's lesson :http://www.diyaudio.rs/blog/6-zen-mods-blog/ ) Link to comment Podeli na ovim sajtovima More sharing options...
generg Napisano Decembar 13, 2010 Share #879 Napisano Decembar 13, 2010 the rest of my day........ :buehehe: :buehehe: :buehehe: Link to comment Podeli na ovim sajtovima More sharing options...
sp300b Napisano Decembar 14, 2010 Share #880 Napisano Decembar 14, 2010 Is there anybody, or all of You have left Link to comment Podeli na ovim sajtovima More sharing options...
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