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Old 15th November 2008, 11:47 AM   #1
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Default 6N6P in an Aikido?

Anyone used a 6N6P in place of a 5687 in an Aikido?

Any suggestions as to plate voltage and cathode resistor size?
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Old 15th November 2008, 01:40 PM   #2
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Do you have the latest Aikido manual of John Broskie (Aikido_Mono 9-Pin rev. B.pdf)?
It contains a table of all the possible tubes and operating conditions...

Though the table doesn't list the 6N6P looking at the datasheet the 6N6P should be happy with the same B+ (200-220V) and a slightly smaller cathode resistor (~220R).

Btw. The schematic you attached seems to be an older one that differs from the one used in the PCB's. The manual contains the latest schematic plus what I mentioned before. I built my Aikido headphone amplifier according to the manual (using 6CG7/6H30).

best, O.
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Old 15th November 2008, 01:55 PM   #3
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I use 6n6p in my Aikido, in the output position.
A remark: the 6n6p is IMO a great tube but needs at least 12-13mA to sound good.

Ciao

Andrea
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Old 15th November 2008, 03:25 PM   #4
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The schematic I posted is from Http://www.tubecad.com/2004/blog0011.htm


Schematic I thought I posted
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Old 15th November 2008, 04:24 PM   #5
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http://www.diyaudio.com/forums/showt...353#post715353

post #96
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Old 15th November 2008, 04:58 PM   #6
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From post #96

back from holiday

i have been using 6n6p in aikido pre
built as per JB specs for 6n1p into 5687
430R cathode resistors 220V HT
with no problems at all

6n1p had arrived when i got home
so i put two in first stage
measures good and sounds better

must be your 6n6p tha problem
how's it going now?
*****************************
So, are you telling me that all I need to do is rewire the 2nd position to accept the 6N6P and its a go?
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Old 15th November 2008, 05:09 PM   #7
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Hi,

see schematics out of the manuals attached...
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Old 15th November 2008, 05:13 PM   #8
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second...
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Old 15th November 2008, 05:13 PM   #9
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The schematic of post 1 is the cascode version of the Aikido, due to the high gain probably not suited as a line stage. Note that the PS noise is not attenuated (just a 0.47uF and 100k resistor at the bottom 5687) as the cascode has very low PSRR.
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Old 15th November 2008, 08:14 PM   #10
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Post #4 is the schematic I used. I posted the wrong schematic in my post #1.

Quote:
The schematic of post 1 is the cascode version of the Aikido, due to the high gain probably not suited as a line stage. Note that the PS noise is not attenuated (just a 0.47uF and 100k resistor at the bottom 5687) as the cascode has very low PSRR.

I've been using it since it was first put on the blog and have had no problems with it. It has a lot of gain so I turn the input control down.

I guess I should have mentioned that I have several of the boards from the group buy that Bas had.
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