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Old 13th September 2005, 12:14 PM   #1
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Default Aikido as a headphone amplifier (Output transformer groupbuy)

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.
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Old 13th September 2005, 12:47 PM   #2
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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


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Old 13th September 2005, 12:57 PM   #3
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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?
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Old 13th September 2005, 01:21 PM   #4
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Yes. I have built a clone of the Decware MLB Headphone amp...Schematic available at www.Decware.com

Theirs:

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My MLB Clone:

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I like the Aikido better.

dr._sleep
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Old 13th September 2005, 02:35 PM   #5
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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!
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Old 13th September 2005, 04:57 PM   #6
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I am interested in 2, depending on price.
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Old 4th November 2005, 03:26 PM   #7
00940 is offline 00940  Belgium
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any updates on this ?
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Old 4th November 2005, 04:00 PM   #8
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No update really...I'll ask the winder if he wants to wind a couple.
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Old 4th November 2005, 07:22 PM   #9
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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
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Old 4th November 2005, 07:27 PM   #10
Sheldon is offline Sheldon  United States
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I'm good for a couple.

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