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Old 15th April 2010, 02:46 PM   #1
Bengali is offline Bengali  United States
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Default Aikido Janus Shunt PSU

Hi,

has anyone recently used JB's Janus Shunt PSU for their aikido?

would it provide a significant improvement in sonics?

for the 12dw7 tube, the heater voltage has to be a seperate transformer
from the rectifier and aikido tubes?
thx
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Old 15th April 2010, 03:19 PM   #2
Stixx is offline Stixx  Germany
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A well built shunt regulator will be an improvement for an Aikido amplifier.
Though I didn't use the Janus regulator I am using the Salas HV shunt regulator (thread here on Diyaudio) in my Aikido headphone amp.
It was a very noticeable and worthwhile improvement especially in terms of transparency and soundstage.
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Old 15th April 2010, 03:34 PM   #3
Bengali is offline Bengali  United States
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very cool.

I'll have to look into the salas HV one.

are there boards available for the salas HV or did you do P2P?
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Old 15th April 2010, 05:14 PM   #4
Stixx is offline Stixx  Germany
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I did mine P2P , but there was a group buy for boards...

--> http://www.diyaudio.com/forums/group...roup-buys.html

Quanghao is someone you can trust...
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Old 22nd September 2010, 04:21 PM   #5
phi70 is offline phi70  United States
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Default Well built, excellent layout, no line regulation

I bought it to complete my total rebuild of a tight and unemotional sounding canary CA-801SE preamp. It just so happens that the Aikido Octal Dual mono and the Janus shunt regulator fits with no mods required except for a change in the rectifier tube to fit the height and filament supply.

Extremely easy to build. I substituted all 47uF lytics with VALAB 47uF 500V film (and they fit).

Scoped it and there is NO hash at all. BUT if you tune the scope to sweep at 250ms or slower, you will see the lack of a reference V for line regulation causing slow dips and spikes of up to 30mV or so. Not good.

The sound is not necessarily tubey and it does not really help with warmth.
It does suppress piano transients vs no regulator.

Much easier to build than Jan D.'s linear audio regulators but it falls short with no line regulation.
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Old 22nd September 2010, 04:43 PM   #6
piero7 is offline piero7  Italy
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Yes, the salas regulator sounds great with aikido!!
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Old 22nd September 2010, 04:54 PM   #7
phi70 is offline phi70  United States
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Default How high a B + are you using

300V? (Will it go up to 330V ? I need something like this for a different project)
and are you using 1 SALAS HV to power each channel or just stereo mode?

Thanks!
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Old 22nd September 2010, 05:57 PM   #8
Stixx is offline Stixx  Germany
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Using just one reg for both channels works like a charm, I recently finished another headphone amp (C3G spud) with a Salas HV shunt reg. Now I can pull my hair which one sounds better...

The Salas reg should go up to 330V... to be sure just ask on the thread (in the power supplies section). Up to about 80-ish mA (55mA into the load in my Aikido) the Salas reg works very reliable, I had no worries whatsoever for about a year of playing time now. Recommended.
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Old 22nd September 2010, 06:04 PM   #9
phi70 is offline phi70  United States
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Default Thanks, may I ask whats your parts-list

and which variation of the schematics you are using? Thanks.
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Old 22nd September 2010, 06:50 PM   #10
Stixx is offline Stixx  Germany
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I didn't follow all of the thread lately, but the schematic attached seems to be the latest. There also was a groupbuy for boards by the same quanghao using the same schematic. P2P is perfectly doable though.

Good luck!
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