F5 power amplifier

[tinitus]

was nice to come home and read

[galop]

I have question.Is transformer vith 19,8v-0v-19,8v,ok for F5 ?

[smyslow]

Originally Posted by thanh1973

Could you compare it to any other amps you have built, or own.

I've only compared the F5 with my old diy amp, which is now approximately 20 years old. It's design is based on the Crescendo amplifier published by the Elektor magazine. But the F5 is much, much better then my old amp.

BTW, here is a pic of my current setup. As CD source I use a Sony CDP 337 ESD and the speakers comes from Dynaudio. On top of the CDP you see a pcb with the single to balanced converter, which is my present diy toy

Uwe

[Nelson Pass]

Originally Posted by galop

I have question.Is transformer vith 19,8v-0v-19,8v,ok for F5 ?

Probably.

[gaborbela]

Mr. Pass many thanks for your help .
That mean I will try another option to . I did lot of research on these topic .There are many different possibility .Zener diode to the ground , resistor to the ground , resistor the Source of the JET etc .
Greets

[gaborbela]

Smyslow very nice amp .
Well done .
Greets

[P. Lambda]

Smyslow,

I am planning on building a balanced F5. Is your bias
1.6A total for each channel or is that for each pc board ?

[AndrewT]

the bias current flows through each and every output device.
In a pair of push/pull devices (standard F5) each will pass bias current.
The PSU will supply the bias current.

A balanced set up will pass the bias current through every output device.
The PSU will supply double the device current.

[mstr]

Originally Posted by smyslow

But IMHO I belive that the balanced F5 gives a bit more resolution, warmer sound, etc. And yes, I've done some listening sessions together with MSTR (an other forum member) where we have compared the sound of the balanced F5 to the original one. There are also some nice pics from our very first F5 bulding and listening sessions, maybe MSTR will post some

Hi all,

as Uwe suggested, there are some nice pics from our first F5 building session which we want to share with you... We built this monster in order to get first impressions of the sound and stability, so please ignore the "Frankenstein" look of this amp.

Funny sidenote: Ignoring the strange (some may say "technical") look, the sound is really great, so I decided to keep this monster in my livingroom until now... althrough the WAF-factor is quite low

My current setup is a combination of F5, fed by a D1-clone (TDA1541S1 to first stage of D1, followed by B1 used as output buffer), and the sound is really amazing!

Thanks to all of you for your contributions to this project, thanks to EUVL for his Toshiba-based F5 schematic, and special thanks to the Master himself for sharing this wounderful design with us & keepin' the DIY spirit alive!

greets, Michael

[yildiray]

Way to go mstr!!

i m very jealous can i ask to you needless question,where did you buy your eurocard board? from rothelectronic?