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Old 28th September 2012, 04:55 PM   #2071
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THis guy says it much better.

"takes a backward step from ultimate resolution to go mellower, softer and just slightly voluptuous."

"It all makes perfect sense however once you compare the ... to tube amps of equivalent power which operate in a faster, more open-bandwidth EL84 milieu. To get so close to their sound without glowing bits is remarkable. What the ... throws into the mix as a bonus is a bit of extra overall grip, probably less operational noise and most likely a few degrees more illumination."

THis is how i would characterize the F6 I am listening to.

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Old 28th September 2012, 05:02 PM   #2072
lhquam is offline lhquam  United States
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Buzz: Sounds like you are getting better sound than from my amp. What bias current are you using? What are your source resistances? What feedback resistances?

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THis guy says it much better.

"takes a backward step from ultimate resolution to go mellower, softer and just slightly voluptuous."

"It all makes perfect sense however once you compare the ... to tube amps of equivalent power which operate in a faster, more open-bandwidth EL84 milieu. To get so close to their sound without glowing bits is remarkable. What the ... throws into the mix as a bonus is a bit of extra overall grip, probably less operational noise and most likely a few degrees more illumination."

THis is how i would characterize the F6 I am listening to.

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Old 28th September 2012, 05:28 PM   #2073
generg is offline generg  Germany
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.....the problem could be that two perfect matched halves produce mostly k3 and no k2 and a slight mismatch will care for the k2 part. Of course absolute distortion is growing in this way, but the SemiSouth have so much less distortion compared to the IRF that you can risk some more k2 distortion to tailor the sound!

you must only find a way to get the offset of about 200mV back to zero but keep the distortion spectra.... or take a cap!
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Old 28th September 2012, 05:30 PM   #2074
Zen Mod is offline Zen Mod  Serbia
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why offset , when you can add SE bias?
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Old 28th September 2012, 05:33 PM   #2075
generg is offline generg  Germany
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o.k not accustomed to this possibility....
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Old 28th September 2012, 05:39 PM   #2076
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My long lost brothers of audio. I really need to go to europe and stalk ZM and Generg. THey are having all the fun.

@Ilquam
I have my bias at about 1.5A. I am playing with Rs values of .1,.15, and .25. You know the whole cap connection deal. I also have my caps bypassed with film types. I really have to get a look at the measurements of the two output fets. Their matching does play a significant role in all that we say and I am in the dark as far as those parameters go. I seem to like less Rs the most, with the cap positioning being a major component of tweaking sound(your pot idea). You haev to be careful, because the second harmonic can be too great and everything gets kinda scrwey sounding in terms of vertical postitioning. I will try my best to do a full writeup with measurements and all in next month or so. Not promising anything though.

Oh yeah. My wife, who is completely irritated with my audio addiction, likes it better than F5T. I gotta stop talking you to guys and go listent to some music
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Old 28th September 2012, 05:40 PM   #2077
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o.k not accustomed to this possibility....
Bread trail to audio Nirvana.......
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Old 28th September 2012, 05:42 PM   #2078
flg is offline flg  United States
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Hey Buzz, try a glass of Baileys with that coffee! Not in it but, after a sip, before a sip, repeat...
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Old 28th September 2012, 05:44 PM   #2079
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Makes everything sound better
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Old 28th September 2012, 05:58 PM   #2080
generg is offline generg  Germany
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......My long lost brothers of audio. I really need to go to europe and stalk ZM and Generg. THey are having all the fun. ....

without ZM i would be mouse,

with him I feel better....a little be more grown up..... maybe like a rat..

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