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6N3/6N6 headphone amp using PCB.
6N3/6N6 headphone amp using PCB.
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Old 21st May 2021, 04:12 PM   #221
JoeAlders is offline JoeAlders  Netherlands
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Quote:
Originally Posted by baudouin0 View Post
Actually just about anything will work! The more open loop gain you have there the lower the distortion should be but the distortion is quite low already.

You are absolutely correct!
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Old 21st May 2021, 04:50 PM   #222
Ryssen is online now Ryssen  Sweden
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Originally Posted by JoeAlders View Post
I use the ECC99 as first stage. A very fine tube.
Have you changed anything in the first stage?
I thought of trying 6CG7 in the first stage....
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Old 21st May 2021, 06:35 PM   #223
kodabmx is online now kodabmx  Canada
Spreading triode love.
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6N3/6N6 headphone amp using PCB.
6CG7 first stage I'd use 470R instead of 240R but it'll work if you just plug it in...
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Old 22nd May 2021, 09:45 AM   #224
Ryssen is online now Ryssen  Sweden
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I tried 6cg7 but i think 6n2 has bettet bas so I swircheb back.
Tubes diesel have a stund.......
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Old 24th May 2021, 10:53 PM   #225
Ryssen is online now Ryssen  Sweden
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I just wanna say that Its sounding great DEEEP bass great attack and nice highs.
With my Philips headphones.
I´m preparied to say that its the best heaadamp I`ve built.that is 4 peaces..
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Old 25th May 2021, 01:44 AM   #226
Francois G is offline Francois G  United States
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6N3/6N6 headphone amp using PCB.
Congratulations!

Just to be sure, did you stick with the schematic you posted in #213? Did you use the OP’s (kodaBMX) PCB to build it?

Thanks,
Francois
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Old 25th May 2021, 07:05 AM   #227
Ryssen is online now Ryssen  Sweden
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Yes its that schema Ecxept I use 6N2P and ecc99 and R1 100 ohm.
And I built it per to per,no pcb.
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Old 10th June 2021, 08:29 PM   #228
dl3it is offline dl3it  Germany
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Default "theCarefulApproach"

I carefully studied this thread and decided to start my first design with tubes. In my brain work transistors, so please, be patient with me

I intend to build a headphone amp for loads from 32R - 600R. The idea with the WCF gave good results in the sim, and for the lower impedances, I decided to use an EDCOR WSM 600/150. High impedance devices will be connected directly...
Volume control will be done in the preamp. It's designed to accept 1Vrms as max input, with max. 3.8Vrms output @300R load.

I already have some 6N3P-EV and 6N6P-EV in my hands and plan to start with them.

Before I go into layout, fell free to give me any comments.
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Old 10th June 2021, 09:14 PM   #229
Ryssen is online now Ryssen  Sweden
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I think mine drives 32 ohms HP fine without transformer.
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Old 10th June 2021, 09:45 PM   #230
dl3it is offline dl3it  Germany
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I've chosen the transformer mainly to have it and to play with it. I never used transformers in audio circuits and this is a nice playground for all kind of new "experiences".
In the simulation, driving 32R was no problem... But the THD results were significantly better with the transformer for low impedance HPs; that's why I decided to be prepared... I'm pretty much aware that the sim is something different than the real circuit; but it will be interesting to see, where to find the main differences.

Btw, I corrected the CCS
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Last edited by dl3it; 10th June 2021 at 10:03 PM. Reason: attach correct schematic
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