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Old 26th February 2012, 01:20 PM   #1
Koifarm is offline Koifarm  Netherlands
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Default 6N16 headphone amplifier

In a other thread i am writing about a 6N16 preamp, in this thread i also started to build a headphone amp. Now i think it is better to give this amp his own thread.

6N16 12x preamp srpp/cathode follower with printed circuit board design.

This is what i have done until yet.

Schematic 6N16 headphone amp.

Click the image to open in full size.

PCB design(100x160mm).

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Pdf fot creating PCB film.

http://www.monstercore.nl/6n16hoofdpcb.pdf

I tested the design and got a sample of the sound i can expect.
The PCB board have different possibilities for the output capacitor, this is because there are a lot of people with there own preferences. Below some possibilities for the output capacitor.

Click the image to open in full size.

Today i assembled the PCB board with the parts i already got.

Click the image to open in full size.

Ronny

Last edited by Koifarm; 15th May 2014 at 01:51 PM.
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Old 26th February 2012, 02:25 PM   #2
DF96 is offline DF96  England
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No need for the second 1M resistor in each channel, as U2B get bias from the 10k grid stopper.

The volume pot will eventually become noisy, due to grid current from the valve passing though the wiper. Add a cap and grid leak resistor to avoid this.
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Old 26th February 2012, 02:52 PM   #3
Koifarm is offline Koifarm  Netherlands
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Thank you,

for your input.

About the 1M resistor i leave it there i like the stage as parallell as possible.
The grid resistor i will ad and the capacitor is already on the grid on the PCB.

Ronny
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Old 12th March 2012, 06:52 PM   #4
Koifarm is offline Koifarm  Netherlands
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The end result plays beatiful without humm and noise.

Click the image to open in full size.

Deep bass with enough power to play at high levels.

Click the image to open in full size.

Click the image to open in full size.

Ronny
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Old 13th April 2012, 02:59 PM   #5
Koifarm is offline Koifarm  Netherlands
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I designed a big brother for the 6n16headphoneamp, the 6n6headphoneamp.
This amp can deliver enough power to drive headphones like AKG K701.
It is a very simple design with great sound. No humm or hiss.
And not to expensive to build, even when you select good low esr capacitors and special PIO capacitors.

Click the image to open in full size.

Datasheet 6n6p : 6N6P.pdf

Last edited by Koifarm; 13th April 2012 at 03:03 PM.
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Old 13th April 2012, 05:56 PM   #6
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It seems to me that the supply voltage is a little too low.
The performance would be better with 100 V...120 V as +Ub.
Why did you choosed only 75 V ?
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Old 13th April 2012, 06:06 PM   #7
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1. Reverse biased electrolytic drawn;
2. No grid leak resistor for 1'st tube,
3. Is it 10 Ohm cathode bias resistor for cahthode follower?

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Old 13th April 2012, 09:31 PM   #8
Koifarm is offline Koifarm  Netherlands
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Quote:
Originally Posted by artosalo View Post
It seems to me that the supply voltage is a little too low.
The performance would be better with 100 V...120 V as +Ub.
Why did you choosed only 75 V ?
If the tubes have a bias around 20mA that i like most. First stage draw 19ma en the second stage draw 44ma(2 x 22ma). That with the 75V supply.
Further i have a lot of 2 x 15V transformers so i do not have to buy another one.
The highvoltage transformers are much more expensive here in Netherlands. 24VA transformers with 2 x 30V cost here 8 euro, highvoltage transformers start at 40 euro. Because of the low Ri of the 6n6 you can get high bias with low anode voltage and it sounds good.

Last edited by Koifarm; 13th April 2012 at 09:45 PM.
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Old 13th April 2012, 09:34 PM   #9
Koifarm is offline Koifarm  Netherlands
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Quote:
Originally Posted by Wavebourn View Post
1. Reverse biased electrolytic drawn;
2. No grid leak resistor for 1'st tube,
3. Is it 10 Ohm cathode bias resistor for cahthode follower?

"Who can't design build kits for others"
It function as drawn and build. Just try it. And leave then comments.
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Old 14th April 2012, 08:54 AM   #10
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Sorry, but it looks just weird.

The "SRPP" stage shares 75v between two 6N6P triodes - each one sees 37 volts. No way you can get 19 mA through them... looks like you have them biased at about 4 mA and -0.4volts???!

You should R-C decouple the voltage amplifier from the CF stage: the currents drawn by the CF will modulate the (shared) power supply!

The cathode follower is not the most musical stage. Its output impedance (=Ra/mu) is modulated by the music signal, and Ra is not constant when the current changes.

You could try to CCS load the CF, or just increase the B+ voltage to 150v (as you should have done in the first place) and use a White cathode follower.
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