Lazy Singing Bush

[Zen Mod]

don't forget, it all started here (Mr. MR's ootoobe vid on bottom)

2SK77B shown on pics/screen

btw, exact specimen, according to 66081 serial, is right behind my back, along with his brother ........ still having residue of thermal goop Pa smeared on

 

[Zen Mod]

Ok, so a 2SK77B has same "form factor" as the "puck" MOSFETs?
It is nice to see distortion profiles with dominating 2nd and a bit of 3rd and then other harmonics almost zero.

go back to page 1
in first several posts you can see exact performance of pure MOS, Schade MOS, and SIT iterations

all 3 laid out with all necessary graphs, sans Papa's most beloved giglywigly showing superimposed main and residue - I'm too lazy to arrange that test, too much hassle

 

[Zen Mod]

and difference between 2SK77B and IXYS puck form factors

 

[MEPER]

Yes, I have looked several times and got confused how good pure MOSFET looks.
Also that I have no idea what a Shade MOS is.......

 

[MEPER]

and difference between 2SK77B and IXYS puck form factors

Thanks! .....then I only need a translation of Shade MOS 🙂

 

[Zen Mod]

I believe it is shown on Schade schematic, again page 1 (whatever your browser posts/page setting is)

shown in several threads around, trick to emulate SIT with Mosfet

not all goodies, but most

final result depends of arrangement and surrounding circuitry, but certainly useful trick

 

[codyt]

I think in any form, this is a very, very worthy amp

 

[Zen Mod]

Thanks! .....then I only need a translation of Shade MOS 🙂

there is an easy way ....... and easy way

https://www.google.com/search?q="sc...BVYgBVZIBATGYAQCgAQHAAQE&sclient=gws-wiz-serp

 

[MEPER]

Thank you.......something to study.
My iteration will be with THF51s but still busy with mechanical work.....

 

[Zen Mod]

Cody, impressions after few days more?

What is going to stay in cases - SB , or LSB ........ or you're going to make another pair of MonoBlocks?

 

[codyt]

Its an unbelievable, emotional, three-dimensional, pleasure machine. The sound is huge and palpable. UNREAL. Gonna have to build another big SIT amp I guess.

I've continued experimenting with mu values. Attached screenshot for .3/.13. Listened to .35/.07 earlier, and now working back up. Listening to .35/.1 right now. Granted I'm throwing most of the mu-fo advantage away, but its fun to play and listen.

 

[Zen Mod]

yeah, I told ya - all my amps are sounding the same

 

[codyt]

We need one big ZM SIT amp with a giant switch on the front – flip up for common source; flip down for common drain.

 

[Zen Mod]

no............
ya know old saying ..... "what's better than one good amp? ........ 2 good amps!"

 

[Zen Mod]

besides ........ Pa so spoiled Greedy Boyz of lately, with all those Swiss Knife little blingies

easy to build, one Iq for morning, second Iq for noon, third Iq for evening, fourth Iq for night, one THD for morning, second THD for noon, third THD for evening, fourth THD for night, one phase for morning, second phase for noon, third phase for evening, fourth phase for night, one PSU for morning, second PSU for noon, third PSU for evening, fourth PSU for night ...............

in short, even if I came to some novel idea to spoil Greedy Boyz further, inevitable to find later that Pa already covered it, 6 months ago

 

[codyt]

Very true. I'm just kidding anyways – if there was just one amp to rule them all, I'd be bored to tears. I'd much rather build and try 20 different amps 😀

 

[Plott]

Its an unbelievable, emotional, three-dimensional, pleasure machine. The sound is huge and palpable. UNREAL. Gonna have to build another big SIT amp I guess.

Cody, you perfectly understand how to trigger the "want to have" feeling
I like your build very much 👍

 

[codyt]

Thanks! And, yeah, I know what you mean. I'm cautious to not oversell an amp, but at the end of the day, I prefer to be honest about what I'm what I'm hearing.

Of course, it probably appears that I really love everything I've built, and that's largely true. But that's also because I'm selective about what I'm building and there are a ton of amazing amps to be built around here 🙂

 

[Zen Mod]

Luckily, not everything is candidate for Babelfishing ....... so I can still catch some sleep in my life

 

[codyt]

Ok, one more measurement. This one .35/.07 – practically straight CCS. You can start to see more 3rd. and even some 4th creep in. So far, .35/.1 has been a sweet spot for my tastes.

Second image is an animated GIF showing the four measurement frames – starting with largest mu 'action' and ending with near CCS.