Zen Mod

After successful realization of concept , I knew that few shortcomings of Iron Pre aren’t in necessity for Preputium made of parts , or Iron choice …… it is in fact of still having resistive attenuator …. and always tempting fact that somehow is possible to dispense scarce Toshibas for something you really can buy in nest Tobacco Store. So ,as a result of my day(night)dreaming, it came to prototyping of Iron Pumpkin , both SE and Bal iteration . Last one simply without suffix, while former obviously having SE as part of name. Due to intrinsic nature of balanced xformer ( fed ballanced , outputting signal also ballanced ) with necessary involvement of GND on either or both sides , it’s also having virtues of SUSY , as Papa patented it years ago. (Old Bull/Devil , always tongue in cheeks ). So , conclusion – to my ears – inductive attenuator is best sounding of all alternatives , and I really succeeded in dream of achieving (settable) gain with same device and , last but not least , natural conversion of SE to Bal , or other way around , in case of Iron Pumpkin (Bal) .

Anyway , what was main quality of (then) newly explored territory for Mighty ZM …. I couldn’t easy describe what that was , and only after few years I came with explanation how I understood it – what I was hearing ( and I hear that even after all these years) is result of important phenomena – Signal Energy Preservation. Simple – with resistive loading – efficiency of stage is always low , while with inductive loading it is way higher …… energy of signal isn’t dissipated along the chain (as with resistor) , it is being transformed in ratio of intrinsic values (voltage , current , thus impedance). Remember that I’m not formally educated in electronics , so I’m pretty much free to invent new postulates whenever I want . During the years , having direct contact with plenty of pro gear (in radio production), I started noticing signal iron in plenty of positions , my Guru discover to me how versatile can be all sorts of so called repeater coils , scavenged from old telephone equipment … To cut (some , not all ) story short – I started collecting all sorts of signal Iron , thinking how one day I should/could/would use them in something ( that behavior is , I believe , familiar to every Greedy Boy around). Besides my (very successful) experiments with xformers as main DAC I/V conversion elements , especially when used fully differential ,and numerous more or less successful attempts to include Iron everywhere in audio chain , I was (not worthy) given by pair of (so called basic ) Intact Audio 200$ AVCs; my own personal German ( known around as Golden Ear-ed Generg ) sent them as Geschenk . They’re ( realized as basic passive box) pretty good sounding , combined with papa’s Koan M2 : AVC & Input Selector for Papa’s Koan M2 ; temporary case ? | Zen Mod Blog So , What is Gain structure > What is Gain Structure? , I’m pretty happy with recippe – efficient and sensitive speakers ( not necessary synonims!) , good amp with power in regular FW bracket , few or none db of gain in box intended ffor selecting and adjusting signal source . However , during the years , playing with all sorts of signal attenuating devices ……resistive (P&G, Noble, TKD, ALPS,all sorts of stepped attenuators,blahblah) , LDR based Dropbox - PSM LS Cook Book.pdf inductive (Intact Audio , Sowter) , I came to conclusion that – besides principle of Signal Energy Preservation , impedances are also very critical , so buffer is conditio sine qua non ….. one step back , but that one step is what is necessary to achieve further two steps in front. It’s not easy to make both cheap and good soundiung buffer ; complementary Toshiba JFet buffer (see PSM LS CookBook) is becoming more and more PITA to make (money not being crucial , but hassle in obtaining them ) , while all other ones are either crude or bulky in comparison . To latest idea about no gain/small gain preamp I came by chance , already written here : What's wrong with the kiss,boy ? and Iron Pre | Zen Mod Blog , so I’m not going to repeat that.

Mda Objavih temu na Big Diya , ali me mrzi da kucam opet na naški, pa cu samo copy/paste kontam ce se snadjete ........... Well , it started long ago …. when I was really young(st)er, full with naivete and BS , came to pretty novel idea to make xformer loaded tube line stage … Result of first tests , hardly optimal ( using two halves of 6SN7 in parallel and loaded with ancient xformer from vertical section amplifier of ancient B-W tube TV set) , I was blown with ‘till then unknown dimension of sound – everything was so alive …. Later I made several iterations of line stage with same approach , being so proud for reinventing boiled water , until I got some xerox copies of Sound Practices , where I found that even in boiled water reinventing I wasn’t first ….. boyz from Italia already made Euridice preamp ; anyway , intermediate iteration was with two halves of 6DJ8 in parallel , latest one being with ubiquitous EC8010 and custom made xformer . That being even published on my old site – WOT preamp and battery charger

mediapan je daleko od mrtvog ......... a ono - da valja , ne valja

m..pa da ...... elem gotovo i sa bal modulom ....... dakle sve je gotovo - sastavljeno i isprobano sad da se pripremi dokumentacija , otvoriza proper tema i da se objave seme i slike

meni svidjava

aha, francuske fajle

koju dokumentaciju , kakvo oduzivanje ?

Iron Pumpkin SE pcb (selector , shunt reg , diamond buffer ..... mono pcb) sastavljeno , pusteno u rad , provereno

das stolaru ili bravaru crtez , ako treba pojasnis sta koga briga za cega je - za to sluze crtezi

javlja mi se da bi bilo zanimljivo zapoceti gledanje hronologije Clint Eastwood-a onda Rutger Hauer

Obisao Ikeu ? mozda ima i online katalog ili bravar u susednoj ulici

kakoj ti F7 sviri u kombinaciji ?

yup Cherry Iron (2000)

kako ne vidis? Cherry Harbeth

0db !!

naravno ...... kad nema fancy delova

evo mene kod Laze Lazarevica ..... al izgleda nisam sam.....

Svi smo mi Woland!

šinko , sočini ga li visočije?

jes , sa driverima nazivne snage oko 30W/16R (poenta je u sisama , a ne vatima )

neka , slatke su to muke

prica se po kuloarima da je M2 uparen sa AI L2 , i cujem neke kontradiktorne tvrdnje za gain ....... ?

custom je da customije ne moze ......... .......... a regularna ponuda ce biti i SE i Bal , sa ili bez pripadajuce elektronike