Mea Culpa - maxima ........ 
I know Stifa - he wasn't clear enough mentioning his toob pre , and I didn't clarify that - his tube preamp have gain stage , and CF as final part .
I know Stifa - he wasn't clear enough mentioning his toob pre , and I didn't clarify that - his tube preamp have gain stage , and CF as final part .
every decent made ( not counting ones starving at 30-40V Ua) ECC88 based pre is capable of that ; even these starving at low A voltage are capable for that swing , but they're mediocre from other reasons
in any case - stifa's previous amp was Hiraga , but he wasn't happy with some minor things regarding build quality , power was sufficient for his needs
considering that F5 is more friendly than Hiraga in several aspects (technicaly wise , I'm not comparing sound - matter of taste , in any case ) , I presume that he'll be happy with F5
True
Just wanted to know what the final sound character would be like, based on someone's perspective. I know it is hard to guess just on specs.
Anyhoo, my room is 20sqm 6x3 and these Linn speakers are actually easy to drive.
Big thanks to ZenMod he was very forthcoming and helpful with my choice and amp problem.
He makes good brandy too Peace
True
Just wanted to know what the final sound character would be like, based on someone's perspective. I know it is hard to guess just on specs.
Anyhoo, my room is 20sqm 6x3 and these Linn speakers are actually easy to drive.
Big thanks to ZenMod he was very forthcoming and helpful with my choice and amp problem.
Peace
In character, it is similar to Alephs in the top end - detailed, open and magical. It doesn't feel like you are listening to the electronic equipment. It feels very real. The area where is different from Alephs is bass. It is, solid, fast well controlled bass . In the top end it will go as far as your tweeters would allow and beyond. It has such a well balanced sound, yet it is very simple amp. That is why I think that anyone should make one.
Choky makes the best brandy - period.
Hi I built F5 amp but wanna get more class a sound to my 4ohms speakers.I remember that there was lower voltage version F5 about +-16 volts with high bias but i couldnt find the schematic.I remember that a german person redesigned it.Where to find them ?
Hi Umit,
try this one, its EUVLs balanced F5 version with Toshiba devices, highly recommended
http://www.diyaudio.com/forums/1542055-post1216.html
try this one, its EUVLs balanced F5 version with Toshiba devices, highly recommended
http://www.diyaudio.com/forums/1542055-post1216.html
I dont have balanced soundcard so what to do ?and the schematic is not clear. I can not see the resistor values
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if you want to bias your amp much higher than the original F5, I recommend to use the F5 with toshiba devices -> they allow higher maximum dissipation due to increased size of the package, so it is easier to transfer the heat to the heatsink
you can see the details of the schematic if you save the file to disk, and open it with MS-Word (insert->picture->from file->*.wmf)
you can see the details of the schematic if you save the file to disk, and open it with MS-Word (insert->picture->from file->*.wmf)
thank you.but i see that i have transformer that have 4x18 volts output 600va. I think i could not build this amp..Is it possible to run toshibas at +-25 volts 1.3a bias as using original F5 circuit? should i change any resistors ?thanks
umut - these issues are beaten to death - at least 20 times - in original F5 thread
you're going to make amp worth few Euro grands ..... make some efforts in reading what's already written .
you're going to make amp worth few Euro grands ..... make some efforts in reading what's already written .
cviller just designed a 2 output per rail board for F5. This would allow higher bias at least before leaving class A, assuming you got some good heatsinks.
Is the ECC88 = 6DJ8?
Sorry, being from the USA and not dealing with Euro tube types much I get them confused since they all seem similar in nomenclature to me...
If so, then it will sound like the ECC88 does for the most part, imho.
Around these parts the single F5 builder has found that the implementation effects the resulting sound, I agree.
Wonder if anyone has checked the DF of the amp, that would account for some difference in the bottom end compared to other amps.
I tried the F5 running only my horns from 250Hz up.
Rick is using it (it's his amp) full range, but in a small room.
You need an extra 10dB of gain in the preamp, and 10dB of headroom, which may or may not be an issue - probably not with a tube stage.
_-_-bear
umut, ask that question over in the regular F5 thread?
Sorry, being from the USA and not dealing with Euro tube types much I get them confused since they all seem similar in nomenclature to me...
If so, then it will sound like the ECC88 does for the most part, imho.
Around these parts the single F5 builder has found that the implementation effects the resulting sound, I agree.
Wonder if anyone has checked the DF of the amp, that would account for some difference in the bottom end compared to other amps.
I tried the F5 running only my horns from 250Hz up.
Rick is using it (it's his amp) full range, but in a small room.
You need an extra 10dB of gain in the preamp, and 10dB of headroom, which may or may not be an issue - probably not with a tube stage.
_-_-bear
umut, ask that question over in the regular F5 thread?
yup - ECC88 = E88CC=CCa=6DJ8=6922
even if some are so called - pro - they're just selected ;
oww there are lots of things to read and sometimes my english is poor.I mean 2sk1530/j201 (toshiba) I remember that there were less treble when using these transistors.Fairchilds were more detailed.But i remember that Vgs were 2.8 volts when using toshiba 2sk1530/j201
> I remember that there were less treble when using these transistors.Fairchilds were more detailed.
My own experience is quite the opposite.
Patrick
My own experience is quite the opposite.
Patrick
Hi EUVL.Maybe i remember wrong.I want to try toshiba 2sk1530/j201 again but i need a schematic works at +-25 volts DC.because my transformer has 4x18 volts ac output.Thank you
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I've been using F5 with my speakers in 4ohm mode and i didn't notice any indications of the sound deterioration, mind you. I must admit speakers are 100db and i run it without any preamp.
I have two speakers.one of them 86db westra speaker and other one is 89db nokia german..So i need more power.I want to apply but I can not apply EUVL's design because I have +-18 volts ac output.