How did you do your Aikido?

Original Burnedfingers · 17th November 2005, 11:37 AM

Ok, another Aikido thread if no one minds.

I purchased (2) power supply boards so I could put together 2 separately powered Aikido channels for the total experience.
I was lucky enough to have salvaged (2) transformers from 2 commercial 6V6 SE paging amplifiers for my power transformers.

My transformers were 275-0-275 with plenty of spunk on the high voltage side but somewhat lacking in the current department when lighting the 6.3 volt filament. That was my reasoning for using two transformers instead of one.

I tried the 6N1P for the 1st tube and the 5687 for the second tube
and found the sonic signature to be great.

My second ecperience was to try a 6FQ7 in the #1 tube spot with a 5687 in the second spot.

I am enjoying the 6FQ7 better than the 6N1P. Seems more open, free and uncluttered. This may or may not account for the higher price on ebay for this tube.

Still sitting on the counter in the garage without an enclosure at this time.

What is the status of your diy Aikdio project?

Bill*B · 18th November 2005, 01:17 AM

Built mine with octal 12AH7 in both positions, but biased with a 2K2 on the input and a 1K on the output (330V B+). A bit of an odd one in that I transformer coupled both input and output. Once I got the output transformer grounding sorted out, it has been a well behaved performer. Bill.

Bill*B · 21st November 2005, 10:15 PM

Here's a link to my "Aikido" (and power supply) details/photos for those who may be interested. "Aikido"

Original Burnedfingers · 21st November 2005, 10:22 PM

Very nice Bill.

aletheian · 22nd November 2005, 04:44 PM

i built up an Aikido with a 6SJ7 into to a 6922. The gain is pretty high, but the noise is really low. The pentode was hand picked for low noise and microphonics. I used a pretty stiff 350V-ish mosfet-regulated chokeless supply. The sound is sweet, with some pentode roundness. I'm diggin' it.

Cassiel · 22nd November 2005, 04:55 PM

Quote:

i built up an Aikido with a 6SJ7 into to a 6922.

Could you post the schematic? I have an Aikido with 6dj8 and ecc81, but i want more gain and i would like to use a 6EJ7 i have at hand.

aletheian · 22nd November 2005, 05:16 PM

Quote:

Originally posted by stalker

Could you post the schematic? I have an Aikido with 6dj8 and ecc81, but i want more gain and i would like to use a 6EJ7 i have at hand.

Here is the schem without the component values since you would have to tweak them for your tube anyway.

I think I ran the 6922 with either 390r 0r 470r cathode resistors (don't remember which I settled on) and a 500K trimmer as the R9, wired as a variable resistor... a 470K-ish setting produced the lowest noise. I ran the grid stopper before the grid to ground at the input to ditch a little input signal at first, but I have moved it to the other side since then. The C3 snubber is probably not neccessary, but I usually have one there to tweak the brittle high end of my crap DAC. I had a variable B+ supply, and ran it between 290v and 350v, and finally settled somewhere in the middle, but it sounded pretty good over most of that range.

Cassiel · 22nd November 2005, 09:20 PM

Thanks.

dr._sleep · 22nd November 2005, 11:24 PM

Used 6N1P, now using 6FQ7/6CG7 into 5687's without changing any operating points. Sounds good either way.

Mr. Aikido working in the dark, as usual.

The setup,

the little gold box is a 12AU7 cathode follower to drive the Crown DC150 to Subwoofer. Sony 685 modded with tube output stage, my Aikido drives 2 EL84 based monoblocks to Alk's modded Klipschorns.

dr._sleep

Bill*B · 23rd November 2005, 04:45 AM

Lord, I've always wanted a pair of Klipschorns. I'll bet that setup sounds great.

22nd November 2005, 04:44 PM	#5
aletheian diyAudio Member Join Date: Apr 2004 Location: Philly	i built up an Aikido with a 6SJ7 into to a 6922. The gain is pretty high, but the noise is really low. The pentode was hand picked for low noise and microphonics. I used a pretty stiff 350V-ish mosfet-regulated chokeless supply. The sound is sweet, with some pentode roundness. I'm diggin' it. __________________ Heghlu'meH QaQ jajvam!

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Use 9 pin Aikido PCB kit or buy 8 pin ?	Renron	Tubes / Valves	6	25th November 2007 04:52 PM
JB Aikido Pre 9 pin kit	Renron	Swap Meet	1	20th November 2007 07:51 PM
New PSU for Aikido?	cbutterworth	Tubes / Valves	5	6th September 2007 01:03 AM
Aikido	HiFiNutNut	Swap Meet	1	24th January 2007 04:26 AM
Aikido PSU help	cbutterworth	Tubes / Valves	48	13th October 2006 07:54 PM

New To Site?	Need Help?
Register to Participate Search Privacy Statement Contact Us	Frequently Asked Questions Did you forget your password? Mark Forums Read


	Please consider donating to help us continue to serve you. Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving

17th November 2005, 11:37 AM	#1
Original Burnedfingers diyAudio Member Join Date: Nov 2002	How did you do your Aikido? Ok, another Aikido thread if no one minds. I purchased (2) power supply boards so I could put together 2 separately powered Aikido channels for the total experience. I was lucky enough to have salvaged (2) transformers from 2 commercial 6V6 SE paging amplifiers for my power transformers. My transformers were 275-0-275 with plenty of spunk on the high voltage side but somewhat lacking in the current department when lighting the 6.3 volt filament. That was my reasoning for using two transformers instead of one. I tried the 6N1P for the 1st tube and the 5687 for the second tube and found the sonic signature to be great. My second ecperience was to try a 6FQ7 in the #1 tube spot with a 5687 in the second spot. I am enjoying the 6FQ7 better than the 6N1P. Seems more open, free and uncluttered. This may or may not account for the higher price on ebay for this tube. Still sitting on the counter in the garage without an enclosure at this time. What is the status of your diy Aikdio project?

18th November 2005, 01:17 AM	#2
Bill*B diyAudio Member Join Date: Sep 2004 Location: tampa, florida, USA	Built mine with octal 12AH7 in both positions, but biased with a 2K2 on the input and a 1K on the output (330V B+). A bit of an odd one in that I transformer coupled both input and output. Once I got the output transformer grounding sorted out, it has been a well behaved performer. Bill.

21st November 2005, 10:15 PM	#3
Bill*B diyAudio Member Join Date: Sep 2004 Location: tampa, florida, USA	Here's a link to my "Aikido" (and power supply) details/photos for those who may be interested. "Aikido"

21st November 2005, 10:22 PM	#4
Original Burnedfingers diyAudio Member Join Date: Nov 2002	Very nice Bill.

22nd November 2005, 09:20 PM	#8
Cassiel diyAudio Member Join Date: Sep 2004 Location: Madrid	Thanks.

22nd November 2005, 11:24 PM	#9
dr._sleep diyAudio Member Join Date: Jul 2005 Location: southern us	Used 6N1P, now using 6FQ7/6CG7 into 5687's without changing any operating points. Sounds good either way. Mr. Aikido working in the dark, as usual. The setup, the little gold box is a 12AU7 cathode follower to drive the Crown DC150 to Subwoofer. Sony 685 modded with tube output stage, my Aikido drives 2 EL84 based monoblocks to Alk's modded Klipschorns. dr._sleep

23rd November 2005, 04:45 AM	#10
Bill*B diyAudio Member Join Date: Sep 2004 Location: tampa, florida, USA	Lord, I've always wanted a pair of Klipschorns. I'll bet that setup sounds great.