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Old 27th January 2003, 03:07 PM   #1
Zen Mod is offline Zen Mod  Serbia
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Default 2SK135+SJ50 amp

OK-just to say hello to all;
I'm not newbie,but I'm just registered here-hehe,even if I'm lurking (peeking?) almost a year.
I'm primary in tube stuff,but just acquired 2 pairs of old ancient mosfets.
I made search through old posts,but I didn't find anything interesting.
so-anybody have nice little one schmtc for amp with these mosfets.
I'm not interested in A class (just 'cause I already have at least 90% parts for Aleph 5),just little one with 7-15W,mebbe just for my PC.
cheers to all!
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Old 27th January 2003, 03:45 PM   #2
joensd is offline joensd  Germany
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Hi,
have a look here : my little Aleph3
Should meet your needs.
You could even scale it more down than this.
Probably have a look at the mini-a.(do a search for that)
This is a little tiny PC amplifier.

Regards
Jens
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Old 30th January 2003, 12:43 PM   #3
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choky


if you have a look at this link, you will see an uprated version of an old amp design which originally used a single 135/50's pair to produce 75Watts.
It was an old Maplin design which was intended as a guitar amp. I have built a pair of these many moons ago with uprated output fets and a slightly higher power supply voltage ( +- 50v ) 150Watts out at 4ohms, and tremendous bass punch

its a simple circuit that works surprisingly well, and sounds good.

this one has a few extra touches that the old Maplin one didn't, and you don't have to go mad (like the author of this site did) and bridge the amps for silly powers.....

http://www.hilberink.nl/amps/amps9.htm

HTH

ray
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Old 30th January 2003, 01:51 PM   #4
joensd is offline joensd  Germany
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Quote:
It was an old Maplin design which was intended as a guitar amp. I have built a pair of these many moons ago with uprated output fets and a slightly higher power supply voltage ( +- 50v ) 150Watts out at 4ohms, and tremendous bass punch
The PC speaker amplifier is getting even tinier
But nice link to another amplifier.
The mini crescendo used the 2SK135+2SJ50 as well.
You could take lower rail voltage and scale it a little down.
I don´t have the article but it must be here somewhere.

Jens
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Old 30th January 2003, 02:05 PM   #5
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Default You could take lower rail voltage and scale it a little down.

.. or you could replace the output devices with the mighty Exicon 250W / 200 V lateral FET's .... 4 devices a rail for about 1 Kw


not cheap though...nor would the PSU be either.

ray
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Old 30th January 2003, 02:12 PM   #6
UrSv is offline UrSv  Sweden
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Quote:
Originally posted by TheFettler
choky


if you have a look at this link, you will see an uprated version of an old amp design which originally used a single 135/50's pair to produce 75Watts.
It was an old Maplin design which was intended as a guitar amp. I have built a pair of these many moons ago with uprated output fets and a slightly higher power supply voltage ( +- 50v ) 150Watts out at 4ohms, and tremendous bass punch

its a simple circuit that works surprisingly well, and sounds good.

this one has a few extra touches that the old Maplin one didn't, and you don't have to go mad (like the author of this site did) and bridge the amps for silly powers.....

http://www.hilberink.nl/amps/amps9.htm

ray
I still have a pair of those 75 W modules in my box. Haven't been able to finish that project in 15 years...

HTH
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Old 31st January 2003, 12:54 AM   #7
Zen Mod is offline Zen Mod  Serbia
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tnx fellas!
in any case all proposed amps are already familliar to me;
what I try to find is little cute amp with no more than 15W and no more than 100mA of Iq.
in any case-I'l try to downscale one of many schmtcs I already have
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Old 31st January 2003, 01:39 AM   #8
mlloyd1 is offline mlloyd1  United States
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Default Re: 2SK135+SJ50 amp

Howabout something in this family of circuits:
http://perso.wanadoo.fr/jm.plantefeve/sche.html
talked about in this thread: Mos Amplifier Design

The 2SK1058 and 2SJ162 correspond to the 2SK135 and 2SJ50
Scale the rails down for lower power.
Good luck!

Michael

[QUOTE]Originally posted by choky
....
I'm primary in tube stuff,but just acquired 2 pairs of old ancient mosfets.
....QUOTE]
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Old 8th September 2004, 11:38 PM   #9
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Default 2sj50 class A pcb

Hi,
I'm new in this forum. I want to make a class A power amp using mosfet 2SJ50. Where I can find this PCB in US? Also where I can find i for Crescendo?

Thank's
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