Aikado Based Tubed Headphone Amp - diyAudio
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Old 26th August 2005, 07:38 PM   #1
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Default Aikado Based Tubed Headphone Amp

Just finished this circuit provided to me by John Broskie:

Click the image to open in full size.

And with some valuable advise from members of this forum...

I am pleased to report that this design produces killer sound, with wide dynamics, extremely low noise floor (meaning I hear nothing at full volume wearing Sennhieser 595's with source paused), and final musical notes decay into an abyss of silence.

I decided to try simple, 6.0 volts AC on the filaments (NO HUMMM), tube rectified GZ-32,C-L-C-R-C power supply filter, power tranny stays around room temperature.

Easy to roll several tube types in the front section, 6N1P, ECC88, 6DJ8, etc.

Worthy of consideration for those interested in headphones.

dr._sleep
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Old 26th August 2005, 07:56 PM   #2
agent.5 is offline agent.5  United States
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which transformer are you using?
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Old 27th August 2005, 12:50 AM   #3
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I am using these, Sowter 8665 Headphone transformers
(http://www.sowter.co.uk/)and have used the same on other headphone amps with excellent results. Just under $100 a piece. They need to be cap coupled, there is 125 dc that has to be blocked.

But with 600 ohm impedance headphones you could go the OTL route taking the output right off the last coupling caps..

The results have been debated, but in the end it's a matter of personal taste.

I prefer transformers, others prefer the OTL route. A good 600 ohm impedance headphone are the AKG 240 M (Monitor) at only $100.00, but you could spend $400 on Senn's @600 ohms.

The transformers can be configured for 120 to 600 ohms impedance.

It sounds very fine, not even burned in.

dr._sleep
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Old 27th August 2005, 04:50 PM   #4
Mushal is offline Mushal  South Korea
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Why didn't you make feedback including transformers?? I think Senn is your main headphone..
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Old 28th August 2005, 01:30 AM   #5
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I tested the transformer circuit with and without feedback, for my taste, it sounded better without feedback.

I have not tested the OTL with feedback, perhaps it will do better there. Maybe the OTL needs feedback, I'll try it tomorrow.

dr._sleep
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Old 28th August 2005, 03:21 PM   #6
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Hi Dr.Sleep,

I want to build a tube amp for my Sennheiser HD650 (300 Ohm)
With Mr.Broskie?s permission, I think I'm going to try this design. Do you have higher resolution schematic?
I'll keep you informed about the results
Thanks,
Manuel
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Old 28th August 2005, 11:26 PM   #7
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Thought I'd post a pic of the working, great sounding, headphone amplifier. A tweak or two left to do.
Schematic Click the image to open in full size.

Insides Click the image to open in full size.


Glowing on the outside Click the image to open in full size.

Very simple, no sand anywhere. Cost to build, $325.00 tubes not included.

Sorry I broke the link to the schematic in post #1 by sending up another one.

dr._sleep
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