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Old 22nd July 2008, 02:47 PM   #11
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Quote:
Originally posted by Brit01
What do you think of partnering a dnyakit ST-35 or ST-70 with the Aikido line stage amp?
Chris
I don't know much about dynakit amps, but I think it will work just fine! The aikido with it's low distortion and low output impedance should suit most "normal" power amplifiers.
Besides:Tube amps are often easy to drive!
And: Choose tubes wisely! I would listen to Broskie's reccomendations!

Quote:
Originally posted by beetel
In the picture all four tubes seems to very close to each other.
does the distance between tubes (near or far from each other)
matters?
What is the ideal distance between tubes?
regards
I don't think they are that close 25mm
And I don't think the distance between the tubes changes the sound...
Haven't really thought about that

Mabye if they are mounted to close to each other, it would result in warmer tubes, I guess...
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Old 23rd September 2008, 08:31 PM   #12
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Now I have found an old power transformer! I took it from a broken Telefunken radio at the junk yard

Click the image to open in full size.
Both 6,3V and 262V. Nice

Now I can move forward with the project! I have most if the parts needed!
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Old 24th September 2008, 08:28 AM   #13
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I am thinking about using a choke in the power supply!
I have an old choke, but I think it can not handle more current than ~70-80mA.

I'm using 6N1P and 5687-tubes and this schematic

Do anyone know how big the current will be in the power supply?

I want to know if I can use my choke
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Old 24th September 2008, 08:58 AM   #14
Stixx is offline Stixx  Germany
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Hi Ollebolle,

get the Mono....revA.pdf that includes a table with lots of tubes listed and according component values, current draw and such.
When you can't find it I can mail it to you (when Karsten didn't already mail you the revB which also includes the table).

Your current draw should be in the vicinity of 45 - 50mA (didn't look it up) but well below 70mA.

regards,
Oliver
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Old 24th September 2008, 09:09 AM   #15
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Hi Oliver

Nice hearing from you again. I have already mailed the Rev. B edition to Olle several months ago. Here it is possible to compare the 6N1P and the 5687 in the same Aikido-circuit.

Kind regards

Karsten
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Old 24th September 2008, 09:43 AM   #16
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Quote:
Originally posted by Stixx
Your current draw should be in the vicinity of 45 - 50mA (didn't look it up) but well below 70mA.
Do you mean 45-50 mA per channel? I have only one choke, so I must use it for both channels.


I got an email from Karsten. He think if I'm lucky my choke will work for stereo, but it will be very close.
Two chokes would be better.
Too bad I only have one :/
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Old 24th September 2008, 10:29 AM   #17
Brit01 is offline Brit01  United Kingdom
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Hi guys,

I'm just about to order the Aikido Stereo 9-pin kit from JB.
I'm a total newbie.

I was donated 4 6N1P valves from a very kind member from Netherlands.

I will probably have to have a transformer built by a local tech here. I live in Uruguay so very little available. My girlfriend will be in USA in Oct so I am getting her to bring the kit and parts back from JB.

Exactly what kind of transformer do I need to have built. I understand I need the 6.3 V DC supply for the 6N1P. We have 230 V here.

Also do I need to order the following from the kit?

'Supporting and power supply caps'.

I'm also getting hold of the power supply board from another member.

Many thanks

Chris
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Old 24th September 2008, 11:01 AM   #18
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Watch those telefunken transformers - I bought 4 of those online and all of them were bad. The various voltages are derived by taps off a single winding. Caused me no end of grief at the time until I found out what was wrong. Also watch out for the 6.3V winding being heavy enough to support the 4 tubes.


The rev A and rev B just refer to different versions of his board where there are jumpers you can add to use different tube types. The basic circuit is still the same and if you download the booklet all the critical values are in there for all of the tube types.

Great preamp....

Fran
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Old 24th September 2008, 11:25 AM   #19
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Thank you for sharing your experiences with these transformers! I dodn't know about this

But I have thought about the filament voltages. The transformer can give max 3A. My four tubes will draw 2.1A so it's ok

I didn't know that the various voltages came from the same winding.
Is it bad?
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Old 24th September 2008, 04:22 PM   #20
Stixx is offline Stixx  Germany
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Quote:
Do you mean 45-50 mA per channel?
No, in total for both channels. I just looked through the revB.pdf shortly, so with a B+ of 300V your current draw should be 40mA (5+5mA for the 6N1P and 15+15mA for the 5687). When the choke itself is fine you should be okay...

Quote:
The transformer can give max 3A. My four tubes will draw 2.1A so it's ok
Don't be too sure on this...transformers, especially old ones can devellop all kinds of nastities
(does this word exist ) like mechanical hum, running hot and so on...
But rig it up on a breadboard and try it out.

Good luck!
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