• WARNING: Tube/Valve amplifiers use potentially LETHAL HIGH VOLTAGES.
    Building, troubleshooting and testing of these amplifiers should only be
    performed by someone who is thoroughly familiar with
    the safety precautions around high voltages.

Newbie need help in designing tube preamp for my 3886 GC??Please Help me!!

Hi there. I have a 3886 GC amplifier. But, i think my amp still need a preamp to provide line level gain (maybe about 2.5x)
:angel:
When i run my LM3886 amp, i try to combine this amp with two my friend's preamp (bipolar transistor and valve). :bigeyes:
Then, i got some result. The preamp with bipolar transistor has an give an effect to my 3886 become live, and a little rough. But when i try to combine my amp with tube preamp ;) , of course my 3886 amp become smooth, natural with a deep.
So, i decide to build a tube preamp.:cool:
But, i still newbie in tube, and i want to build that tube preamp. Can anyone help me???
I prefer to build a simple preamp with a simple design, less component but have a high quality.
What tube should i use??12AU7??5687??12AX7??
Do i need to add a choke in psu design??or just use CRC filter???
Is it good to use 1 tube twin trioda in 2 channel??
I need ur help please :bawling:
Thx