This hybrid vacuum tube headphones amplifier has comes in 3 part. I don't have any planning to make an additional post about this but because it sound so good and beyond my expectation, so why not to make some update posting.
For pass few days, I have listen from this little vacuum tube amplifier and it is a new listening experience for me. In the initial built, I am using cheap 3.5mm socket connector. This is very common to use cheap components for the first trial and upgrade it latter. But with this outstanding result, I can spending more for the better components.
So in this post I will return this amplifier to my working desk and make an upgrade on the 3.5mm socket is now using Foxconn.
With all of 3 part of this hybrid vacuum tube amplifier built, here are the bill of materials I spent.
1. Universal board 6x8cm 1 pcs each $0,50 $0,50
2. Dale RN55 resistors 7 pcs each $0,34 $2,41
3. Rubycon ZLH capacitors 6 pcs each $0,21 $1,24
4. Alps green potentiometer 1 pcs each $5,17 $5,17
5. Brouns multiturn VR 1 pcs each $0,83 $0,83
6. Wima MKS-2 100n 2 pcs each $0,49 $0,97
7. Nextron IC socket 1 pcs each $0,34 $0,34
8. TI OP275 dual op-amp 1 pcs each $2,41 $2,41
9. Foxconn 3.5mm socket 2 pcs each $1,72 $3,45
10. Tube socket 9 pin 1 pcs each $1,89 $1,89
11. NOS 6N23P 1 pcs each $8,62 $8,62
12. DC socket 1 pcs each $0,14 $0,14
13. TI LM317T 1 pcs each $0,83 $0,83
14. TO-220 heat-sink 1 pcs each $0,10 $0,10
15. M&S candy tin 1 pcs each $3,45 $3,45 bonus candy
16. Teflon jacket cables 1 meter $0,83
17. 3M rubber feet 1 pack each $1,79 $1,79
18. Volume knob 1 pcs each $0,20 $0,20
Total material cost, excluding working tools US$35,17 quite cheap isn't it.
So at the end, it is a great pocket size vacuum tube amplifier project. It sound really good and listening music from it while see the vacuum tube glowing is the best experience for every audiophile.
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