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Old 22nd November 2008, 06:48 AM   #731
masag is offline masag  Germany
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Hallo Gabor,

very interessting schematics,

have you ever built this amp?

The 2SA606 is hard to find, what is your substitude for this transistor?

With kind regards

Sam
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Old 22nd November 2008, 06:57 AM   #732
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HI
I collected all the available parts , to replace the A606 transistor I will use BD140 .
These amp is a Japanese design , I would like to try it .
I read very good comment about .
Greetings
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Old 22nd November 2008, 07:03 AM   #733
masag is offline masag  Germany
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I read very good comment about .

Please tell me the where?

Is it in japanese language?

Regards

Sam
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Old 22nd November 2008, 07:15 AM   #734
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Hello
Here is it , you can read some comments on English.
Click on the amplifiers after open the page .
http://www.geocities.jp/mutsu562000/
Narsis!!
Greetings
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Old 3rd December 2013, 10:18 PM   #735
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I´m moving over here from the Aleph h thread. It´s an old thread but I´m planning to build a headphone version of this amp and I have a couple of questions:

- Regarding the schematics in post #690. R17, 21, 22 and 23 are marked 1E2. Would that be 1ohm?
- It is suitable for high impedance headphones <300Ohms?
- If I understand the schematics correctly the input jfets are the only transistors in need of matching, correct?

Best Regards Christian

Last edited by ervstil; 3rd December 2013 at 10:24 PM.
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Old 3rd December 2013, 10:40 PM   #736
Zen Mod is offline Zen Mod  Serbia
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-1E2 - European for 1R2 , meaning 1.2 Ohms

- why not

-yes ; as I wrote in that other thread - they're either one 2SJ109BL ( unobtanium) or pair of 2SJ74BL , or newest LSK74B
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Old 28th December 2013, 08:34 PM   #737
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Hi!

First a late thanks for your quick answer. I have a lot of matched 2SK170bl and it got me thinking. It is possible to simply swap the polarities of the schematics and swap the transistors for opposite polarities?

It is possible to do the following:

1. Swap the polarities of the schematics.
2. Replace Q1 for a matched set of 2SK170bl
3. Exchange q2,Q3 from bc556 to bc546
4. Exchange q4 and q5 from bc546 to bc556.
5. I plan to use it as a headphone amp so q6 qnd q7 would be IFR9610

Best regards Christian
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Old 28th December 2013, 08:57 PM   #738
Zen Mod is offline Zen Mod  Serbia
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it's done already somewhere on the forum

maybe is better to chase few dozens of J271 and use them in schm as is
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Old 28th December 2013, 09:25 PM   #739
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It's apparent that Pao is backwards, and really doesn't like p-channel power devices. (especially the hump-backs)
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Old 28th December 2013, 10:48 PM   #740
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Thanks for a quick answer!

I think i found the thread you were referring to, "Inverted" Aleph J? I want to experiment a bit and the j271 doesn't seem to be easy to come by either. So by using my 2SK170bl i can build prototypes cheaper and easier. As i understand it the inverted version will not be sonically worse.

Best regards Christian
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