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Old 10th October 2012, 09:52 AM   #8161
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Originally Posted by samoloko View Post
please read few posts back

what are your impressions with obbligato gold
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I have several builds with obbligato gold... I like those a lot, sweet extended trebble, no harshness at all.
Same impressions, for me taste lacks a little bit of bass & mid-bass.
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Old 10th October 2012, 09:59 AM   #8162
RCruz is offline RCruz  Switzerland
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For a more bass biased sound you can try 4.7uF 630V Ampohm Metallized Polypropylene Audio Capacitor Polypropylene Capacitors

Not as good as the obbligato (that are even better than the Mundorf supreme) but quite inexpensive
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Old 10th October 2012, 04:53 PM   #8163
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Sends me to #4945 alright.
4945 got it tanks
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Old 14th October 2012, 01:39 PM   #8164
RCruz is offline RCruz  Switzerland
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Almost finished the second V12R for my new 57db cascoded "Wallis" build.... smooth
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Old 14th October 2012, 05:00 PM   #8165
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Wallis?
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Old 14th October 2012, 05:43 PM   #8166
RCruz is offline RCruz  Switzerland
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I live in the Wallis Canton (More commonly known as "le canton du Valais")
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Old 14th October 2012, 05:55 PM   #8167
Salas is offline Salas  Greece
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Oh, didn't know, that was Ioannis Kapodistrias area of expertise.
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Old 14th October 2012, 06:23 PM   #8168
RCruz is offline RCruz  Switzerland
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You never fail to amaze me.... Now I know a little bit more about swiss history
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Old 15th October 2012, 02:48 PM   #8169
RCruz is offline RCruz  Switzerland
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Originally Posted by Salas View Post
I was doing some phono related stuff too. Was checking the bias for the experimental ones. I put the two stages together with the Riaa in between. Not too bad the sim models, they only showed 1V more load drop in the second stage. Gain was spot on. So I trimmed the values around it a bit to center the buffer best. It gave ~20 Volt peak to peak before compression started kicking in. I have noted the practical values in red, should be the same for all such example schematics discussed, they share the same second stage and B+. If choosing 7.5mA Idss Q5 & Q6, R11 can be 1.5K. Q3 can be a bit slack for exact Idss choice due to enough degeneration from R8 that takes it near 3.5mA. Looking for ~23V drop across R10 should be that stage's channel matching criterion.
After finishing the shunts I am now preparing myself to build this new toy.

For second stage cascode I have severall options:
R10 = 6200r with Vdrop=23V => Idq= 0.0037 so if Vgsq=0.141 => Rs = 38r
R10 = 6800r with Vdrop=23V => Idq= 0.0033 so Rs = 43r

Why not to use:
R10 = 5600r and Rs = 34r ?
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Old 15th October 2012, 03:36 PM   #8170
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I live in the Wallis Canton (More commonly known as "le canton du Valais")
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