Calor amp 40 Watts Class A

[maxwell007]

so, yesterday i did first run...oscillation on both channels...input shorted, oscillation will increase

 

[Arif Budiyanto]

so, yesterday i did first run...oscillation on both channels...input shorted, oscillation will increase

maybe you can try to install 22pf instead of c5 (15 pf) / lead compensation capacitor... how many ampere do you set bias for your amps?
use bulb test for the first run test for your amps safety...
Best Regards

 

[maxwell007]

bias is 1A..

 

[Arif Budiyanto]

My experience..
I previously installed 13 pf for C15 and my amps oscillated... after I gained 15pf caps and installed them.. my amps run fine...
since i live in tropic country I set bias 1 A..
Best Regards

 

[maxwell007]

will check what capacity i have...

 

[maxwell007]

10pf...i have to order 15p MICA...

 

[thimios]

10pf...i have to order 15p MICA...

Add another 10 pf in parallel and test again.

 

[Kay Pirinha]

Good choice to christen a class A amplifier Calor, btw.


Best regards!

 

[maxwell007]

I couldn't stand it, and till i will received proper capacitor...so a add another 10p and this is it!
Square at 20 and 50kHz fine...sine is perfect...

 

[maxwell007]

I found that i need impove PSU... this is under load 0,1V/div...now i have 4x 10 000uF ...

 

[maxwell007]

and main thing, how does it sound? it's unbelievable...i didn't hear so clear and analytic sound.... across all genre.... I am verry happy!!!
class A is super and it is great heater! 55°C, I hope that is fine....

just for fun..

YouTube

 

[thimios]

Fine!enjoy the music.
Maybe i must built the second channel.
The most expensive part is the transformer,that's why i had stop the project.

 

[maxwell007]

some progress..slowly, but surely..

 

[maxwell007]

my test how does it sound
YouTube
Calor 40W pure class A - YouTube

 

[minek123]

Calor LTSpice sim

This is old thread, but since I have good working model of Calor amp, I thought I would publish it here, if anyone interested.
Seems like a great A Class amp. Idle current: 1A per output device.

 

[egellings]

It will run very warm, so the name "Calor" (Latin for 'heat') is apt.

 

[minek123]

This amp will dissipate at least 120W at idle

 

[Lucca10]

Fine!enjoy the music.
Maybe i must built the second channel.
The most expensive part is the transformer,that's why i had stop the project.

Hello Thimios, due to mr Bora can not help in this amp. build anymore , it would be great if you can share with other people his files .

Kind regards,
Lucca