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Old 16th October 2009, 02:45 AM   #11
athos56 is offline athos56  United States
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Location: Yakima, Washington
Originally Posted by 88man View Post
I am trying to decide between the All-in-one or the Dual Mono Octal Aikido kit. Is there a sonic difference between the All-in-one vs Dual Mono if I use just ONE PSU for BOTH channels?

How will the sound improve having separate regulators for EACH channel with the Dual Mono kit? Channel separation, clarity, dynamics - not sure?... Do I need another power transformer too?...

Proposed Power Supply:
-Hammond 270BX
-Mullard/RCA 5U4-GB
-CLCLCRC: 20uF, 20H (Hammond 193C), 50uF, 10H (Hammond 158M), 50uF, 300R, 50uF. All PSU caps are 440V ASC Motor Run Capacitors.

I went with the dual mono boards because I figured I could use my own PSU design. He has said on a few occasions that regulators are of limited use on the Aikido because of its already good noise canceling properties. I also have been happy with AC filaments raised to 1/4 B+. Additionally, I'm using it as a driver for a KT-88.
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Old 16th October 2009, 03:35 AM   #12
88man is offline 88man  United States
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Location: Boston
Thanks athos56! It's a bit confusing on the Glassware site and Aikido didn't respond to emails about power or their kits.

After reading the fine print, I see that the stereo kit includes a SS power supply for the plate and heaters (minus power transformer).

The Dual Mono kit doesn't have any power supply circuitry on the PCB, thus allowing for a tube rectified design. I am glad that I don't have to invest in another NOS Mullard 5U4-GB tube rectifier and a bunch of Chokes! However, I don't know how much I would trust the "Noise canceling properties," but it's worth a try.
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Old 16th October 2009, 03:41 AM   #13
Glowbug is offline Glowbug  United States
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He also sells a stereo version without the PSU parts.

Might be out of stock, though.
The machine does not isolate us from the great problems of nature but plunges us more deeply into them. - Antoine de Saint-Exupéry
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Old 24th October 2009, 03:33 PM   #14
rhing is offline rhing  United States
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I am currently building the Octal All In One Kit using NP Tung-Sol 6SN7's. I'm going to mount this in a Hammond Aluminum chasis with the tubes mounted on top. For coupling capacitors, I am using Epcos MKV B25834 3.3uF film in oil caps bypassed with Russian FT-3 0.1uF Teflon film caps. I am going to use separate Hammond power transformers for the B+ and heaters. I also purchased Glassware Audio's power switch and input selector switch to use with a TKD pot. Here are some pics of the populated board.

Aikido 8.JPG

Aikido 9.JPG

John Broskie's boards are really thick, sturdy and very well made. The double-sided boards are great for building the amp with tubes, resistors and diodes on top, and everything else on the bottom.
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