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Bas Horneman 13th September 2005 12:14 PM

Aikido as a headphone amplifier (Output transformer groupbuy)
2 Attachment(s)
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.


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


My MLB Clone:

I like the Aikido better.


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 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


Sheldon 4th November 2005 07:27 PM

I'm good for a couple.


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