All about Tubes, Tube Circuits, Tube Gear

Thursday, June 14, 2012

The Aikido Comedy (pt 3): Essence of Aikido

needless to say, the "Aikido Amplifier" has evolved through
several modifications over the years, to further correct for noise and improve performance.

And also, John Broskie has also applied the "Aikido" branding
to several circuits/amps that have quite diverse topologies
and additional devices to improve sound, such as Constant Current Sources
in the Anode loads or cathode circuits of various incarnations, including transistors.

This simply reflects John's own growth and learning-curves
in his understanding of tube circuits and noise control.
We will be discussing some of these 'mods' and John's comments on them later.

Right from the start however, many of the items you refer to
were added back in 2004, not for the purpose of 'Aikido PSRR',
but for safety reasons, likely as a result of some unfortunate accidents:


A Safer version of the Aikido Amplifier

"In the schematic above, safety resistors have been added. The two 1M resistors save the second stage should the input tube be yanked from its socket or its heater opened. The two added 100k resistors save the power amplifier should the cathode follower tube be yanked from its socket, as the same DC voltage will be presented to the coupling capacitor. "

This was the final page of the 2004 Introductory article.

Many of John's modifications were possibly tried much earlier,
and his own personal journey is not available in detail.

However, most of these mods do not at all take away
John's claim or his own perception of the essence of
the "Aikido Amplifier".

For many years he has maintained that the unique and universal feature,
(of "Aikido") has been his own special noise reduction technique,
as described above.

Lately he has tried to extend the "Aikido" branding to
anything and everything that he has published online,
whether original or not.

Is this an attempt to extend his personal "Aikido Empire"?
Or just an opportune absorption of ideas as his learning curve progresses?

We will bring up this issue again as we examine the history.

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