6N16 12x preamp srpp/cathode follower with printed circuit board design. - Page 2 - diyAudio
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Old 18th February 2012, 05:34 PM   #11
Koifarm is offline Koifarm  Netherlands
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Today i build a headphoneamplifier with the 6N16 tubes.And it sounds realy good. Below the schematic and some specs.

Click the image to open in full size.

You can bypass/remove U1 and U3 if there is enough input voltage(1 to 5V).

Specs:

Freq. = 10hz to 100Khz +/- 1 db.
Output power= 5 to 30mW a channel, depending on inputvoltage and headphone impedance.
Output impedance = 16 to 500 Ohm.
Total anode current = 27mA
Total heater current = 1580mA

Ronny
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Old 19th February 2012, 06:19 PM   #12
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Hopefully tomorrow I'll be able to get a board made for your preamp design Ronny.

I'll post some pics if I do.

Ivo
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Old 19th February 2012, 06:36 PM   #13
Koifarm is offline Koifarm  Netherlands
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Very nice Ivo.

Today i have made the PCB design for the Headphoneamp version.

Click the image to open in full size.

Here the PDF.

http://www.ict-net.net/6n16hoofdpcb.pdf

I have left extra space to use your favourit condensators.

Last edited by Koifarm; 19th February 2012 at 06:39 PM.
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Old 21st February 2012, 09:27 AM   #14
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My print is being developed as we speak.

Ronny, what would I need to change if I wanted to experiment with higher voltage and current?

Ivo
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Old 21st February 2012, 03:08 PM   #15
Koifarm is offline Koifarm  Netherlands
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Quote:
Originally Posted by mace1337 View Post
My print is being developed as we speak.

Ronny, what would I need to change if I wanted to experiment with higher voltage and current?

Ivo
R12 and R17 need to be 2Watt. And Heater voltage must be elevated with half the anodevoltage.

Ronny
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Old 21st February 2012, 03:18 PM   #16
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Very nice. I liked how you put them on IC sockets.

Do these tubes need to be matched? oh, what's with the timing circuit and relays?

Last edited by merlin2069er; 21st February 2012 at 03:22 PM.
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Old 21st February 2012, 03:59 PM   #17
Koifarm is offline Koifarm  Netherlands
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Quote:
Originally Posted by merlin2069er View Post
Very nice. I liked how you put them on IC sockets.

Do these tubes need to be matched? oh, what's with the timing circuit and relays?
I also use 2 sockets with one tube, i solder one socket on the tube and one on the PCB. Now they can be connected and removed very easy.

Matching is always better, but until now i have only very small variations within my batch of tubes.

The output delay( 20sec) is a build in security for as the cicuit behind the preamp does not like or can not handle the DC voltage sweep when the tubes are warming up.
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Old 21st February 2012, 06:00 PM   #18
Koifarm is offline Koifarm  Netherlands
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This evening i did the smurfs modification on my sons 6n16preamp.

Click the image to open in full size.

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Old 21st February 2012, 06:14 PM   #19
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Remove couple of capacitors from cahtodes. You don't need them in reverse polarity, it is always + on cathode in respect to ground.
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Old 21st February 2012, 06:48 PM   #20
Koifarm is offline Koifarm  Netherlands
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Quote:
Originally Posted by Wavebourn View Post
Remove couple of capacitors from cahtodes. You don't need them in reverse polarity, it is always + on cathode in respect to ground.
The reason i use two capacitors in the output from the headphoneamp is the size of them. one 50v capacitor is higher them 2 x 25v capacitors. Now the PCB fits in a 50mm high housing. Futher i parallel them with a 4,7uf MKP wima capacitor. This is a personal preference.

Ivo, there is also a thread regarding the 6n16 preamp on a dutch forum.
In case you do not know.
http://www.zelfbouwaudio.nl/forum/vi...hp?f=7&t=15244

Ronny

Last edited by Koifarm; 21st February 2012 at 06:53 PM.
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