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Old 10th December 2007, 08:28 AM   #1
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Unhappy 5687 for Aikido

Hello everyone,I want to use 5687 as the output stage for the aikido preamp,did anyone try before?if the Vp=250v,what's the value of the Rk and R15?Great thanks!
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Old 10th December 2007, 04:23 PM   #2
Sherman is offline Sherman  United States
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According to the Aikido tubes chart on Broskie's website the value for Rk at 250V is 198 ohms and R15 is 79381 ohms.

I've been thinking of doing the same with P-P wiring so I'd be interested in your results!
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Old 10th December 2007, 05:35 PM   #3
Mazuki is offline Mazuki  United States
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Would the 6N6P perform better than the 5687 with all other components same?
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Old 10th December 2007, 06:42 PM   #4
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Default 5687 for Aikido

Jeff Broskie changed his PCB around to suit a 5687. be worth having a look on his site

John Caswell
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Old 11th December 2007, 05:48 PM   #5
flg is offline flg  United States
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I just recieved a GlassWare Bd for 5687. I havent decided on values yet though. Broske suggests around 20mA. I was thinking of running close to 100 ohms Rk at about 125Vp/tube. It's a balance though of what you want to run for the input tube unless you split the supplies? I was thinking maybe a 6FQ7 on the input?

Any other ideas
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Old 26th February 2008, 11:53 PM   #6
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Good suggestion!

My homebrewed Aikido amp uses 6CG7's as input tube.
Try to find the RCA cleartops. Other brands of couse still ok.
Run the amp with a B+ a little higher then suggested, let's say 200 to 250 Volt. Bias the tube with 4 to 5 mA is a good choice.

My opinion is that a 6CG7 starts to sing wonderfull with a plate voltage of 100 to 150 Volts.

As output tube I tryed the 5687 and 6N6p.
There is almost no sonic difference between these tubes.
Mind the difference in pinning layout between those two!!
Have fun, greetings,
Hansel
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Old 27th February 2008, 12:08 AM   #7
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I have some boards that were from a group buy here on the forum. I am using the 6FQ7 as the input tube and 5687 as the output tube. I am running 220 -230 volts with dual mono supplies.
It is very nice listening from Jazz to rock.
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Old 5th March 2008, 06:35 PM   #8
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Hello Burnedfingers and all music lovers!
It looks, that we have almost the same Aikido amp.

Do you use a regulated power supply for the heaters?
In my amp, when I used AC on the filaments, I hear a clear hum, during soft passages with my headphones.

After I used DC, the hum was gone.
In my other preamp, also with the 6CG7, at AC no hum at all....

Is it possible the RCA cleartops are a little more sensitive, then the Electro Harm. or the GE?

Now I use a power supply with skottkey rectifiers, aerovox 100uF, 5 H choke ,aerovox 470 uF , each channel.
This gives me a B+ of about 210 V.

The sound is very good.Maybe better than with a tube rectifier.
When I use it as a pre amp ,she makes a very good match with class D power amps.

Greetings, have fun.
Hansel.
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