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Old 10th September 2008, 10:09 AM   #1771
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dR=dV/dI
Open loop gain(dB)-closed loop gain(dB)= ?

Or as they say in Jamaica: Feed mi Bak deh pon mi face, mon.
Sa, me naa jesta !
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Old 11th September 2008, 05:33 PM   #1772
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Hi there, its 3rd time i read this thread tired already. I am in inspiration of building F5 to try them. I want version with balanced version or X supersymetry. mainly because its almost 4 years I do not have any single ended cable . joke to joke but.. I see two balanced versions.does anybody tried theese and does anybody tried pump up the power (add more outpur devices.I think J-fets can drive more than 2devices) if anybody have spare pcb I would gladly buy them.
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Old 12th September 2008, 10:32 PM   #1773
stein2 is offline stein2  Serbia
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Not much to do now, finishing the boxing before it gets some voltage across the rails... Should be ready in a couple of days...
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Old 13th September 2008, 04:11 AM   #1774
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Default /Supply bridges

Stein,
Suggest you replace those block bridges with fast shottky diodes like the Fairchild 'stealth' ((ISL9R...), the 8ETH03, the Cree CSD... - (no Trr at all = no current spike), etc.
- all are TO220 size, so could easily fit on those "magic" h/sinks.
The improvement is quite significant.

Upgrading those WW power resistors in the C-R-C may be worth doing, too.

Hope the start-up (Variac?) goes well.
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Old 13th September 2008, 07:18 AM   #1775
stein2 is offline stein2  Serbia
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I know all this my dear friend, and I would be delighted to replace the aforementioned parts with whatever you send me

Getting something other than this requires ordering parts in advance at least a month earlier and as I'm in the process of looking for the right amp for my ESLs it is not critical. I even used the not recommended IR's IRFP9240 for starters because if I ordered them in time, I'd still have two weeks ahead of me for doin' nuthin'... As Choky, that is ZenMod, repeated many times, this is Serbia... (still far much better than in Africa)

Cheers mate!

Robert Stein
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Old 13th September 2008, 09:04 AM   #1776
Zen Mod is offline Zen Mod  Serbia
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Quote:
Originally posted by stein2
I know all this my dear friend, and I would be delighted to replace the aforementioned parts with whatever you send me

Getting something other than this requires ordering parts in advance at least a month earlier and as I'm in the process of looking for the right amp for my ESLs it is not critical. I even used the not recommended IR's IRFP9240 for starters because if I ordered them in time, I'd still have two weeks ahead of me for doin' nuthin'... As Choky, that is ZenMod, repeated many times, this is Serbia... (still far much better than in Africa)

Cheers mate!

Robert Stein

regarding parts ....

for some - you just forgot that we discussed some other solutions (diodes ) ;

power resistors in CRC filter - it's certainly better if they have some own inductivity ....... so - unless you use real chokes , you can't find better ones than you already have
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Old 13th September 2008, 11:19 AM   #1777
stein2 is offline stein2  Serbia
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You must be someone else impersonating Zen Mod... No trace of being ridiculously sarcastic and offensive in a very refined and subtle way...

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Old 13th September 2008, 12:51 PM   #1778
Zen Mod is offline Zen Mod  Serbia
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Quote:
Originally posted by stein2
You must be someone else impersonating Zen Mod... No trace of being ridiculously sarcastic and offensive in a very refined and subtle way...



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Old 13th September 2008, 03:43 PM   #1779
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Quote:
Originally posted by elviukai
I want version with balanced version or X supersymetry. mainly because its almost 4 years I do not have any single ended cable . joke to joke but.. I see two balanced versions.does anybody tried theese and does anybody tried pump up the power (add more outpur devices.I think J-fets can drive more than 2devices)
Two of my F6 prototypes correspond to this. Both have 2sk289 and 2sj109 input stages
and drive 4 parallel pairs of outputs in Common Source mode. The difference is that
one of them has inverting inputs and functions as an X amp and the other uses balanced
"current feedback" like the F5.

They both work fine, delivering about 100 watts into 8 ohms, but the dissipation is a bit
high for the First Watt chassis/power supply, and the performance is not so great when
you leave Class A.

I haven't yet decided what it is that I'll release on that - perhaps something else
altogether.

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Old 13th September 2008, 04:08 PM   #1780
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Thank you Nelson, I still did not started F5 , but all parts are here already. I have some feeling (the same when mooved from aleph 5 to x100) that f5 will bring me more hi-fi sound(that means less warm and more resolution) which I like. I am sure that all/ half) Pass beauty will be here.

I have now new speakers (aluminium enclosures,ceramic and beryllium drivers. 97db/2.83v) and I am feeling that something wrong with amplifiers I have so time to try something new.

I will sleep with open eyes waitng for f6, however I will try to not spoilding sound play arround f5 to pump up power.

thanks again

R
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