Hybrid Amplifier Design - Page 3

Luck · 23rd January 2009, 12:24 PM

Another picture for my amplifier.

PH104 · 23rd January 2009, 12:54 PM

Luck -- Beautiful work! I have used those cases but never thought to stack them like that. What a great idea. How did you make the front and back panels?

thank you for posting those pictures!!!

Phil

Luck · 24th January 2009, 01:08 PM

Hi,Phil,

i make the the front and back panels by myself.The most funy thing to use these cases is design the front and rare panels.

Luck · 31st January 2009, 01:41 AM

Hi,all, Here is an inside picture of the first working sample........

Luck · 10th February 2009, 04:04 AM

Hi all,
I am going to make a lm3886 mono amplifier using such chasis.
Woo....So funny!

Ted205 · 10th February 2009, 09:58 AM

whats the heatsinking like ? does it get hot ?

Luck · 10th February 2009, 11:44 AM

Hi....I use the AL case as the heatsink in this design.
It's enough for a mono LM3886 amplifier with one case.

ashok · 10th February 2009, 01:58 PM

Looks great.
How does the unit sound ? Especially the comparison between the chip amp on it's own and the one with the tube input stage ?

I ask this because I built a chip amp that sounds wonderful. Then I added a tube input stage to increase input impedance and get a little extra gain . It killed the original sound. It was still very nice especially the mid range ( which seemed to be more 'real' ) but it sounded 'less dynamic'. Compressed is a crude word but describes it closely. I used a 6DJ8 runnig on 120 volt supplies.
Cheers.

Luck · 11th February 2009, 11:53 AM

Hi, Here i use two ECC88 works as SRPP.It sounds nice!
I suggest you add a close loop feedback from the output to the input of the tube stage.
This will help a lot to get much better sounds.

ashok · 11th February 2009, 03:16 PM

Thanks for your suggestion. I will try out something sometime ...when I have some free time. However I don't think additional overall feedback will bring back the original sound. That is based on my experience with circuits over time. But then nothing is completely done until it has been actually tried out in the real world.
Circuits do odd things with regard to perceived sound and based on my experience and feedback from forum members on various related questions there is a lot to learn yet ! That's fuel for the DIY fire !
Trust that the worst is over in Southern Australia. Our sympathies go out to anyone who has been affected.
Cheers.

10th February 2009, 01:58 PM	#28
ashok diyAudio Member Join Date: Jun 2002 Location: 3RS	Looks great. How does the unit sound ? Especially the comparison between the chip amp on it's own and the one with the tube input stage ? I ask this because I built a chip amp that sounds wonderful. Then I added a tube input stage to increase input impedance and get a little extra gain . It killed the original sound. It was still very nice especially the mid range ( which seemed to be more 'real' ) but it sounded 'less dynamic'. Compressed is a crude word but describes it closely. I used a 6DJ8 runnig on 120 volt supplies. Cheers. __________________ AM

11th February 2009, 03:16 PM	#30
ashok diyAudio Member Join Date: Jun 2002 Location: 3RS	Thanks for your suggestion. I will try out something sometime ...when I have some free time. However I don't think additional overall feedback will bring back the original sound. That is based on my experience with circuits over time. But then nothing is completely done until it has been actually tried out in the real world. Circuits do odd things with regard to perceived sound and based on my experience and feedback from forum members on various related questions there is a lot to learn yet ! That's fuel for the DIY fire ! Trust that the worst is over in Southern Australia. Our sympathies go out to anyone who has been affected. Cheers. __________________ AM

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23rd January 2009, 12:54 PM	#22
PH104 diyAudio Member Join Date: Nov 2001 Location: New Mexico	Luck -- Beautiful work! I have used those cases but never thought to stack them like that. What a great idea. How did you make the front and back panels? thank you for posting those pictures!!! Phil

24th January 2009, 01:08 PM	#23
Luck diyAudio Member Join Date: Jul 2006	Hi,Phil, i make the the front and back panels by myself.The most funy thing to use these cases is design the front and rare panels.

10th February 2009, 04:04 AM	#25
Luck diyAudio Member Join Date: Jul 2006	Hi all, I am going to make a lm3886 mono amplifier using such chasis. Woo....So funny!

10th February 2009, 09:58 AM	#26
Ted205 diyAudio Member Join Date: Jun 2008	whats the heatsinking like ? does it get hot ?

10th February 2009, 11:44 AM	#27
Luck diyAudio Member Join Date: Jul 2006	Hi....I use the AL case as the heatsink in this design. It's enough for a mono LM3886 amplifier with one case.

11th February 2009, 11:53 AM	#29
Luck diyAudio Member Join Date: Jul 2006	Hi, Here i use two ECC88 works as SRPP.It sounds nice! I suggest you add a close loop feedback from the output to the input of the tube stage. This will help a lot to get much better sounds.