Il Penitente

[Zen Mod]

yup, as I said , bad influence of Cyclotron emanation , all the way from Bubba Bob's Davis ...... 'Talian names popping as mushrooms after the rain

anyway, what's better to put on pizza than mushrooms .......

So, last one in series of autoformer gain amps (you can call them all - M2 on Mushrooms ) , this one differing on outputs being classic BJT complementary pair, so sorta blasphemy in Papaland ......... he sinned heavily eons ago ....... while my Sin is recent........

Anyway, here's funny diagram, showing nothing else than bunch of multilegged fuses and some nice iron

hm, yes, my prototype equipped with first genuine ones I snatched from drawer - 2SA1491/2SC3855 ....... but pretty much any "for Audio amp" complementary pair should work well ........ 2SA1943/2SC5200 , TTA/TTC (newest Toshiba incarnation of 2SA/2SC)

rails +/-23V, Iq 1A5

2nd is clearly neg phase, not seen from my gigglywiggly, but I stumbled on nice routine in LTSpice showing just that behavior and didn't yet found reason to doubt it

edit on 20.01.2022. - C109 and C110 are not fitted, neither here nor in schm in post #6, so ignore them; these were "precautionary parts"...... which I initially forgot they're needing investigation (with or without); measurements shown were made with them in place, but after trying without, I can happily toss them out; as result, Freq. linearity (logically) being better without them ..... for instance , 8R load - everything stays in 1db envelope

 

[Zen Mod]

some funny pics from my workbench

 

[Zen Mod]

now, usual drill with 8R load

 

[Zen Mod]

usual drill with 4R load

 

[Zen Mod]

Ok , that's it .......

Pretty straightforward..... nice SETish THD spectra ....... but wait !!

There is also Il Penitente - Il Spettacolo!!!

 

[Zen Mod]

Now - Il Penitente Il Spettacolo is wakoo iteration with special parts in output stage

we can call them Insulated Gate Bastard Transistors ........ made simply by tossing out source resistors of TO220 mosfets, so mosfets are covering just base current of output BJTs

here's schm

 

[Zen Mod]

graphs, 8R load

difference to boring regular Il Penitente is - more uniform THD Spectra on all power levels

 

[Zen Mod]

graphs 4R load

 

[TungstenAudio]

Bad ZM!!

 

[Zen Mod]

that's all

I'm gone, watching Whales

 

[ra7]

Bella!

 

[tombo56]

Yup, those Pannonian Sea whales were incredible, almost like your amplifiers.

Pannonian Sea Whales

 

[dreamth]

Didn't we see all this pictures in another thread made also by yourself named Old Soul? Are we allowed to make two threads with the same content and different names?

 

[flocchini]

Superbo - lavoro fantastico
🙂

 

[Zen Mod]

Didn't we see all this pictures in another thread made also by yourself named Old Soul? Are we allowed to make two threads with the same content and different names?

nope

Old Soul is different .......... and yes - few teaser pics of Il Penitente shown in several last posts of Old Soul thread

but, there it is - detailed

 

[Robin De Wolf]

Very nice! less of a summer amp then Old Soul Ge, more similar to old Soul Bip, but with a nicer decline😀

 

[twitchie]

Il Spettacolo - bloody bastard gate resistors not fitted - means open or jumpered?

Where is Pico these days? He should be awake by now 🙂

 

[Zen Mod]

not fitted means empty position

and - source resistors are in question

Pico is all backwards, presently not fitted in Forum

 

[codyt]

Nice! Digging all the output options of late. MOS, SIT, JFET, BJT, GER… what’s next?? 😀

 

[indra1]

CFP mos to bjt. 🙂