Min Tube(12au7) Headphone Amplifier

[saheb11123]

Great to see things lining up

 

[tiger0691]

Great to see things lining up

Thank you for your cheering.
You may get one PCB.
I will spare PCB only (no parts) for you.

Cheers

Chang

 

[tiger0691]

This amp shows possibility to be used as a preamp.
When I connected to DAC, sound clarity was good enough.
Now I am going for casing.

 

[saheb11123]

I'll be waiting for a detailed review of the sound impression

 

[tiger0691]

Shameful for old case and poor setting!
The house is too big, and amp is small.
But it was done only for removing white noise.
After putting into the case, almost no noise is found.

The next step is aging and testing as preamp.

 

[tiger0691]

After some tuning, there are some improvement.
Voltage to OPAMP was 12V.
It was supposeed to be 14V.
(When I put the amp in the cabinet, it might happen
or the trans that I have changed caused low voltage to OPAMP)

Soon after adjusting to 14V, I could hear the sould that I have longed for.
As a headphone amp, it is good.
Now I am going to connet this amp to main system(power amp).

 

[saheb11123]

Fingers Crossed..

 

[tiger0691]

Pankaj came to my house.
After listening the sound, he was satisfied with my system.
JPW ML910 speaker's performance got better since the twitters were replaced.
He thought that the Preamp was this Ganeda Preamp which was set with Power Amp.

What he heard was mini tube amp.
When I showed this small Preamp, he was surprised
After replacing Preamp into Ganeda Preamp, he told me that small tube Preamp's sound was better than that.

Small & Cheap Preamp does not give cheap sound!
And the noise matter has been solved.

 

[saheb11123]

What did you do to eliminate the noise?

 

[tiger0691]

What did you do to eliminate the noise?

1st Casing : Big & Ugly Cabinet is only for reducing the white noise.
As you see, tube amp is far from transformer.
After putting in the cabinet, noise became less

2nd Earthing : PCB to the Cabinet and Cabinet to earth
After earthing, noise became much less.

Now I can not hear any noise in 50% of volume.
I am listening Music in 30~40% of volume.
In the Maximum Volume, there are little bit of noise.

you can refer my article
http://www.hifivision.com/av-lounge/52214-have-you-heard-about-polarity-power-cable.html

 

[tiger0691]

For soldering purpose where can I find (in India) the illuminated lens you use?

I have been doing DIY soldering since I was in 8th standard but now my eyes are weak and would need one such lamp.... (after 25 years or so).

Thanks in advance.

I got it in Chandni Chawk, Delhi.