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Old 29th January 2013, 08:12 PM   #3861
PauloPT is offline PauloPT  Portugal
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Default 2SJ201 and 2SK1530

Hi,

If I use 2SJ201/2SK1530 instead of 2SJ162/SK1058 (different pin out) what other changes sould I do to the circuit?

Has anyone thought about having a professional etched pcb and organizing a group buy?

Thanks.
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Old 29th January 2013, 08:42 PM   #3862
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hi shaan do you use tone control?
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Old 30th January 2013, 02:56 AM   #3863
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hi shaan do you use tone control?
Nope.
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Old 30th January 2013, 06:02 PM   #3864
PauloPT is offline PauloPT  Portugal
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Quote:
Originally Posted by PauloPT View Post
Hi,

If I use 2SJ201/2SK1530 instead of 2SJ162/SK1058 (different pin out) what other changes sould I do to the circuit?

Has anyone thought about having a professional etched pcb and organizing a group buy?

Thanks.
OK, I now can answer my own question. The 2SJ201/SK1530 are vertical mosfets and not lateral as I first thought. Therefore they can't be used without some changes to the circuit like a VBE multiplier. As I have some around I added 3 more diodes for more bias and because the 2SJ201/SK1530 don't suffer from thermal runway (however they are vertical) it worked. I could then taste the SSA sound and it really sounds very very good! The cymbals, the piano notes, sound impressively natural without any hint of harshness and in a sweet presentation. Curiously, the SSA sound signature is very similar to the SYMEF, the same lively and sweet presentation, very very similar.
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Old 30th January 2013, 07:21 PM   #3865
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Hi PauloPT

Glad you like it, enjoy.
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Old 30th January 2013, 07:57 PM   #3866
Salas is offline Salas  Greece
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Simple rule of thumb we should remember because many datasheets don't clearly mention category by the way: Laterals are never GDS pin out. They are GSD.
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Old 31st January 2013, 12:53 PM   #3867
PauloPT is offline PauloPT  Portugal
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Quote:
Originally Posted by Lazy Cat View Post
Hi PauloPT

Glad you like it, enjoy.
Thank you Lazy Cat for designing this wonderful amp!

I'm going to order some 2SK1058/2SJ162 to make a proper build. I have some questions about it:

1) Is it completely stable, no worries about?
2) The input filter cap is only 22pF, shouldn't it be about 10 times higher?
3) Can I use it with 4 ohms speakers? How much power would I get safely?
4) Has anyone mesured THD, just curious I'd like to know TDH at 20KHz.
5) My home made pcb's always look like something out of an horror movie. I would much prefer to have a nice professional etched pcb, is a group buy for pcb's out of the question?

Sorry for so many questions...
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Old 31st January 2013, 03:45 PM   #3868
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2) The input filter cap is only 22pF, shouldn't it be about 10 times higher?
May-i recommend-you to set the input filter with a FC of 200Khz ?
Or to do-it listening: More you filter EMI and residual distortions from previous stages, better it is. The limit is to keep the phase right at 20KHz.
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Old 31st January 2013, 04:04 PM   #3869
PauloPT is offline PauloPT  Portugal
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Quote:
May-i recommend-you to set the input filter with a FC of 200Khz ?
If my noobie calculus is right with 1k resistor I'll need 796pF instead of 22pF. Is this right?

Thanks.
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Old 31st January 2013, 05:54 PM   #3870
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Bingo !
You can set-it to 750pF to let a little margin to the source impedance
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