@soundhappy : it's the same L profile, just finished some treatment
@dirk1 : dac pcb is made by my local store Bella-Audio
@dirk1 : dac pcb is made by my local store Bella-Audio
@ Nicoch58
Yes for more close and direct connection to drain
@ Gadut
I see on first L profile photo one part more flat if
compare to other but it was optical illusion.
Have fun
thiagomogi: Simple: reverse the polarity of the entire circuit and use the 2SJ28 in place of 2SK82.
I did an amplifier with 2SK82 (using an current source instead of the inductor) and I can say with confidence that is one of the best amplifiers I made for listening at low to moderate volumes! And I am an tube fan... So bring an 2SJ28 amp!
I did an amplifier with 2SK82 (using an current source instead of the inductor) and I can say with confidence that is one of the best amplifiers I made for listening at low to moderate volumes! And I am an tube fan... So bring an 2SJ28 amp!
Or if you have both you can make something like: http://www.diyaudio.com/forums/pass...e-sit-pp-amp-baf-sit-beast-thousand-psus.html
I have made them with 2SK70/2SJ20 from NEC
I have made them with 2SK70/2SJ20 from NEC
2SJ28 need change components for 7812
positive bias voltage regulation
Excellent diy project congratulations
What about heat sinks temperature ?
Any background noise in speakers & low end bass ok ?
I see your build are made to keep short wire connections & signal path
Great work build with care by passionate diyer
Bravo
Christophe
Wow, beautiful work! Parabéns! (Congratulations)
I would change just one thing: I would put the SIT in the middle of aluminum bracket in order to better distribute the heat. The heatsink seems to be Ok in size, because only the SIT dissipes on them (he uses inductor and not current source). If you like to listen at low/moderate volumes, the SIT SE should sound better, but they are my ears; you should decide on.
Another thing, if you have left the 2SJ28 you can also sell it, as surely there will be a DIY eager to know the SIT's (not me, I already know them).
I would change just one thing: I would put the SIT in the middle of aluminum bracket in order to better distribute the heat. The heatsink seems to be Ok in size, because only the SIT dissipes on them (he uses inductor and not current source). If you like to listen at low/moderate volumes, the SIT SE should sound better, but they are my ears; you should decide on.
Another thing, if you have left the 2SJ28 you can also sell it, as surely there will be a DIY eager to know the SIT's (not me, I already know them).
Very nice work. Great wiring. Wish I could do that.
I recently went back to the 6 watt SIT with CCS. So hard to beat. Too good.
Also have the L'amp with 193v choke.
Nice work!
Vince
Heatsink size...
For minimum heatsink size reference, an picture from my 2SK82 stereo testing: the current source are attached in an CPU heatsink, and the two SITs are bolted to a "car amp module" lying in my lounge ground. It's size is insuficient, contrasting thiagomogi work (and my work are also far more messy...). My building here is an "in an hurry"... This heatsink size will work for only one SIT (mono). Bigger is better, for less chip/die temperature and long life.
Also attached an FFT analysis near 8R/1W, showing spectral results (excuse the bad line interference; I measured this amp before using CLC in the supply and better place things).
This amp is with an friend now, in different heatsink.
Since I are an "tube man" and trafo designer, I use valve amplifiers, but this SIT SE is very very good and special, better than some tube amps I made.
For minimum heatsink size reference, an picture from my 2SK82 stereo testing: the current source are attached in an CPU heatsink, and the two SITs are bolted to a "car amp module" lying in my lounge ground. It's size is insuficient, contrasting thiagomogi work (and my work are also far more messy
...). My building here is an "in an hurry"... This heatsink size will work for only one SIT (mono). Bigger is better, for less chip/die temperature and long life.Also attached an FFT analysis near 8R/1W, showing spectral results (excuse the bad line interference; I measured this amp before using CLC in the supply and better place things).
This amp is with an friend now, in different heatsink.
Since I are an "tube man" and trafo designer, I use valve amplifiers, but this SIT SE is very very good and special, better than some tube amps I made.
Attachments
A little suggestion (for all SE amp users) : if yoy have at hand one xover inductor near 2mH or higher, with low wire rdc (less than 1R), you can use in place of R1 (from your schematic). Or if you have some spare money...
R1 use is good and cheaper (far better than using none), but when I put an 2mH inductor from an failed xover project in place of it, my circuit become far more silent, especially at high freq. The supply line become far less poluted from HF harshness from rectifiers. Beacuse of new silent operation, the sound becomes more detailed and relaxing.
Even with so low inductance, the results are good, hence the suggestion.