Projects for next hollidays (the world smallest VBITNGC??)

[Upupa Epops]

Franz, send me a mail, I will send you my soft start - 100 % reliable .

 

[Franz G]

Upupa: did you receive my mail?

Franz

/EDIT: I just found your answer in my spam mailbox... (Thanx)

/EDIT/EDIT: The amp is ready to play now:

An externally hosted image should be here but it was not working when we last tested it.

 

[Franz G]

Never ending story? I got smaller boxes:

An externally hosted image should be here but it was not working when we last tested it.

 

[Franz G]

An externally hosted image should be here but it was not working when we last tested it.

Franz

 

[Tekko]

This will be exciting

 

[Franz G]

This will be exciting

What? It IS exciting

Tekko: was it not you, asking for samples? Did you see my post here:

http://www.diyaudio.com/forums/showthread.php?postid=563743#post563743

Nothing for you?

Regards
Franz

 

[troystg]

Hey Fanz-

I just showed my wife this thread and the small GC.

She said you were a "cool guy" for making something women could appriciate too. Not just another black box...

 

[Franz G]

The cool guy continues (thanks to your wife, whats here name ;-) ?

Now, inside the small amps, two pcb's: a multilayer setup, some would it call 3-D circuit

An externally hosted image should be here but it was not working when we last tested it.

The trimmers are here, to optimize the current for the tube by listening, they will be replaced by fixed resistors.

The small amps now really sound perfect, with the good coupling caps (before MKS, now MKP, good audio quality).

Franz

P.S.
Some people, from portugal , will remark: low value of the bypass caps. And what you dont see: snubber's in the power humpty...
This configuration can now really compete to (my) regulated version.

 

[Tekko]

Way to go Franz! How many watts ?

 

[Franz G]

2 x 22 W Sinus, because they are driven by just +/- 25VDC (free trannies...)

Franz

 

[Tekko]

Hum that is plenty for the heatsink size

 

[Franz G]

Thats true

I will check it out soon on the workbench, how long it takes with full power, to activate spike.

Good night
Franz

 

[falcott]

Wow Franz, I like it! It's so tiny!

 

[Upupa Epops]

I like more " big tits " .

 

[troystg]

The cool guy continues (thanks to your wife, whats here name ;-) ? Franz

Jennifer. And not much in audio impresses her(She has tolerated my tinkering for 15+ yrs) so yours has lots of appeal.

 

[Franz G]

Rabstg: my question about her name was just a joke...

BTW: I just runned a mini amp at 8R with full 22W 1kHz sine for 10 minutes: no spike activated!

Franz

 

[Tekko]

Did it warm up any and what voltage did you run it on ?

 

[Upupa Epops]

Franz, try it by 8 % of nominal power ( cca 2 W ) - it is measuring by EN 65... - you will see .

 

[Franz G]

Did it warm up any and what voltage did you run it on ?

I run it with +/- 25VDC. And of course, it got hot. But still no problem to touch the heathsink. I guess, about 60 to 70 degree at the hottest spot from the heathsink.

Franz, try it by 8 % of nominal power ( cca 2 W ) - it is measuring by EN 65... - you will see

Sorry, Upupa, I don't understand, what you want to tell me! Nominal power of what? What is EN65?

Franz

 

[Tekko]

Ok, what about using +-12v instead of +-25v ?