Aikido as a headphone amplifier (Output transformer groupbuy)

Bas Horneman · 13th September 2005, 12:14 PM

Our member bonny_kjs who drew up the pcb for the Aikido pcb groupbuy, can also wind transformers.

He is offering to wind a tranny similar to Sowter Type 8665

Any interest? The boards could be used with a very simple rewire to look like attached schematic.

dr._sleep · 13th September 2005, 12:47 PM

Giving credit where credit is due...John Broskie sent me this schematic after I inquired about using the Sowter OT's in the Aikido design for a headphone amplifier.

I am very happy with the results...the circuit provides an OTL output, choice of several output impedances via transformer, a variety of tubes in the first section, 6922, 6DJ8, EC88, 6N1P, heater starved 12A**'s, and can due double duty as a serious preamp, gain is its thing.

Carefully constructed, no real need to complicate the building with regulators and other sandy stuff...but that is a personal preference.

Power supply filtering C-L-C-R-C.

dr._sleep

Bas Horneman · 13th September 2005, 12:57 PM

Yes ofcourse...John Broskie also drew up the pic shown in the first post.

Thanks dr_sleep! Have you compared it with any other headphone amp?

dr._sleep · 13th September 2005, 01:21 PM

Yes. I have built a clone of the Decware MLB Headphone amp...Schematic available at www.Decware.com

Theirs:

My MLB Clone:

I like the Aikido better.

dr._sleep

Bas Horneman · 13th September 2005, 02:35 PM

Thanks dr._sleep... I'm not going to ask you how much better etc. Like Nelson Pass said in his PLH paper..not a quote...but it went something like this......somewhere along the line you get tired of telling people how good something sounds..build it and find out

Excellent words words by a great guy!

leadbelly · 13th September 2005, 04:57 PM

I am interested in 2, depending on price.

00940 · 4th November 2005, 03:26 PM

any updates on this ?

Bas Horneman · 4th November 2005, 04:00 PM

No update really...I'll ask the winder if he wants to wind a couple.

CaliforniaBob · 4th November 2005, 07:22 PM

I'm interested in 2. if it's easy what are the specs: prim impedance, output impedance or is it same as the Sowter.

Great job, guys

Bob

Sheldon · 4th November 2005, 07:27 PM

I'm good for a couple.

Sheldon

13th September 2005, 12:57 PM	#3
Bas Horneman diyAudio Moderator Emeritus Join Date: Apr 2002 Location: The Netherlands Blog Entries: 18	Yes ofcourse...John Broskie also drew up the pic shown in the first post. Thanks dr_sleep! Have you compared it with any other headphone amp? __________________ Boatanchor amps forum My "adventures" in audio

13th September 2005, 02:35 PM	#5
Bas Horneman diyAudio Moderator Emeritus Join Date: Apr 2002 Location: The Netherlands Blog Entries: 18	Thanks dr._sleep... I'm not going to ask you how much better etc. Like Nelson Pass said in his PLH paper..not a quote...but it went something like this......somewhere along the line you get tired of telling people how good something sounds..build it and find out Excellent words words by a great guy! __________________ Boatanchor amps forum My "adventures" in audio

13th September 2005, 04:57 PM	#6
leadbelly diyAudio Member Join Date: Dec 2002 Location: Calgary, Alberta	I am interested in 2, depending on price. __________________ Aerodynamics are for people who can't build engines. Enzo Ferrari

4th November 2005, 03:26 PM	#7
00940 diyAudio Member Join Date: Sep 2003 Location: Paris	any updates on this ? __________________ Ben.

4th November 2005, 04:00 PM	#8
Bas Horneman diyAudio Moderator Emeritus Join Date: Apr 2002 Location: The Netherlands Blog Entries: 18	No update really...I'll ask the winder if he wants to wind a couple. __________________ Boatanchor amps forum My "adventures" in audio


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13th September 2005, 12:47 PM	#2
dr._sleep diyAudio Member Join Date: Jul 2005 Location: southern us	Giving credit where credit is due...John Broskie sent me this schematic after I inquired about using the Sowter OT's in the Aikido design for a headphone amplifier. I am very happy with the results...the circuit provides an OTL output, choice of several output impedances via transformer, a variety of tubes in the first section, 6922, 6DJ8, EC88, 6N1P, heater starved 12A**'s, and can due double duty as a serious preamp, gain is its thing. Carefully constructed, no real need to complicate the building with regulators and other sandy stuff...but that is a personal preference. Power supply filtering C-L-C-R-C. dr._sleep

13th September 2005, 01:21 PM	#4
dr._sleep diyAudio Member Join Date: Jul 2005 Location: southern us	Yes. I have built a clone of the Decware MLB Headphone amp...Schematic available at www.Decware.com Theirs: My MLB Clone: I like the Aikido better. dr._sleep

4th November 2005, 07:22 PM	#9
CaliforniaBob diyAudio Member Join Date: May 2003 Location: SF	I'm interested in 2. if it's easy what are the specs: prim impedance, output impedance or is it same as the Sowter. Great job, guys Bob

4th November 2005, 07:27 PM	#10
Sheldon diyAudio Member Join Date: Dec 2003 Location: San Diego	I'm good for a couple. Sheldon

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