Poll..anyone interested in an Aikido linestage PCB group buy?

[Bas Horneman]

Seth sounds good, if possible try to ask for an extra tap of 215 that will give you a little more flexibility. And also 3,15 - 0 - 3,15 (1,5A) twice.

so you have primary
0-120


secondary
0-215-250

secondary
3,15-0-3,15 (1,5A)
3,15-0-3,15 (1,5A)

And if you are going to use the psu board (and thus the 6X5) another
0-6,3 (600mA)

If that is outside your budget..and you would like to use your original specs..0-6,3V taps...you are going to have to use a pair of 50R resistors to create a pseudo center tap for the filaments (which works fine by the way..it all depends on your own set of tastes and budget.)

 

[leadbelly]

Bas,

My PSUD II simulations look nowhere as good as yours. 🙁 Did you use some kind of staged current draw so you could use those big caps? How did you set up the current draw?

Not looking for details, as what I am simulating is very different than yours (a 6AX5 tube on 1 PS board powering 4 main boards). Don't try to talk me out of, I have spent enough PSUD hours on it to refuse giving up 🙂

 

[Bas Horneman]

Hi Leadbelly...where do they look good? Is there a post you are referring to?

 

[Burnedfingers]

Got my boards thanks.

 

[Burnedfingers]

Anyone know what the current draw is for one channel when using the 6N!P and 5687 tubes?

 

[Seth Hensel]

If you are modelling in PSUDII start with around 20mA in constant current

 

[Bas Horneman]

< redacted basaudio links>

Here is a BOM made by Seth. Thanks Seth.


No representation is made as to continuation of stated prices or applicability of parts choices

 

[Bas Horneman]

Here are some nice R-Cores that would be suitable for the Aikido
http://www.vt4c.com/shop/program/main.php?cat_id=55&group_id=7&hit_cat

Especially the out of stock one 😉
R0050-043 or this one
R0080-036

just remember in the psu board case you'd need only one winding for example 0-260 even though it has 260-0-260 windings.

Thanks Guglielmo for this tip!

 

[Seth Hensel]

Some of us are wondering what the correct value is for power supply C1. My simulations in PSUD II indicate a value around 4uf.

Can anybody confirm or deny?

 

[Bas Horneman]

Hi Guys,

Just a little note to say that all the Aikido boards are gone and have been shipped. I have around 6 psu boards left and and will test the octal version soon.

Also I wanted to say that I probably won't add anything to the manual since no-one has commented or asked me anything. So I assume that it was a superfluous document.

Has anyone built their Aikido yet?

Regards,
Bas

 

[Sheldon]

Manual superfluous? No, I'm sure it will come in handy when I build the amp. But that won't be for a little while. A quick remainder on where to find it?

sheldon

 

[Bas Horneman]

< redacted basaudio links>

Still in draft form.

 

[2wo]

Hey, I got mail.

I was starting to worry that the post office lost them.

They look good but I leave on vacation today so I won't be able to play with then till I get back.

Thanks Bas and Bonny.

 

[Burnedfingers]

Quote:

Anyone know what the current draw is for one channel when using the 6N!P and 5687 tubes?


I didn't know if anyone was curious or not but when I fired up one channel I got .01465mA. This was with a 6N1P tube in the #1
position and a Tung-Sol 5687 in the #2 position. I also tried a 6922 JAN Phillips tube in the #1 position and found it drew .007mA with the 432 ohm cathode resistors.

Voltage across the 432 ohm cathode resistors at the #1 tube position is 1.555V and the number 2 position is 4.35V.

 

[rick57]

Any thoughts on how the Aikido preamp sounds compared to a Grounded Grid preamp; and what would be less expensive?

www.diyaudio.com/forums/showthread.php?s=&threadid=59170&perpage=10&pagenumber=1

(At $120 per that thread's grimberg, or less, the GG appears to be cheaper)

Thanks

Richard

 

[Bas Horneman]

Any thoughts on how the Aikido preamp sounds compared to a Grounded Grid preamp; and what would be less expensive?

Grounded grid would be cheaper..

Who is to say what sounds better? Build them both and tell us I would say 😉

 

[J Epstein]

Burnedfingers:

Ohm's Law: V=I*R or I= V/R

So 1.55/432 = .0036 AMPS (not milliamps) = 3.6 mA

double that for 2 channels, you'll get about 7.2 mA

And

4.35/432 = .01 AMP = 10 mA
Double that for both channels, you'll get about 20 mA

Therefore total B+ current draw is about 27.2 mA for the whole circuit.

-j

 

[Burnedfingers]

Burnedfingers:

Ohm's Law: V=I*R or I= V/R

So 1.55/432 = .0036 AMPS (not milliamps) = 3.6 mA

double that for 2 channels, you'll get about 7.2 mA

And

4.35/432 = .01 AMP = 10 mA
Double that for both channels, you'll get about 20 mA

Therefore total B+ current draw is about 27.2 mA for the whole circuit.
***
That is what I meant to say, thanks. I just didn't label it correctly.

No real need for the Ohm's Law schooling since my answers were correct, just labeled wrong.

Actually, isn't there some current draw from the voltage divider?

 

[Bas Horneman]

Actually, isn't there some current draw from the voltage divider?

Yes..there will be a little current drawn there...

 

[jleaman]

Pic One

Well here is my case that i got for my Pre-Amp.. kinda big but i like it gives me room to invest insome newer volume pots input selector's etc etc..