Zen Mod

yup, editovano

lepi

radi se na demo primerku , Iron Pumpkin SE ce gudi na FAK-u , ako svi loncici budu na broju

footprints

Iron Pumpkin preamplifier(s) kits Mrzi me da ponovo pisem (na srpskom) pa samo paste sa Big DiyA: cene za tuzemstvo/Otadžbinu/lokal - bez shipping i paypal troskova i jos 10% dole Well , everything explained and shown in technical thread : http://www.diyaudio.rs/topic/8681-iron-pumpkins/ on sale are several options : 1. Iron Pumpkin SE (yup , that one being for RCA inputs/outputs) ,consisting of : -Iron Turtle SE AVC , as assembled and tested unit (two irons on one common pcb ), rotary switch ,50cm flat cable finished, necessary stand-offs -two pcs of Iron Pumpkin SE mono pcbs (selector, shunt regs , buffer -all that on one pcb) , with all small SMD JFets presoldered , all BC bjt critters , voltage references , BD bjts for reg CCS ,all relays, Philips MKC 1uF caps , selector Lorlin switch with two finished flat cables, all multiturn trimpots , necessary 1-pin sockets for optional Borbely WCF buffer iteration, u22 cap for WCF price - measly 550E , plus 30E for Paypal , P&P expenses 2. Iron Pumpkin (Bal) (yup , that one being for XLR inputs/outputs , possible combination with RCAs, read threads for that) ; that one consisting of : -Iron Turtle (Bal) AVC , as assembled and tested unit (one iron on one pcb but two pcbs stacked having same footprint as previous one) , rotary switch,50cm flat cable finished, necessary stand-offs -two pcs of Iron Pumpkin (Bal) mono pcbs (selector, shunt regs , buffer -all that on one pcb) , with small SMD JFets presoldered , all BC bjt critters , voltage references , BD bjts for reg CCS ,all relays, Philips MKC 1uF caps , selector Lorlin switch with two finished flat cables, all multiturn trimpots , necessary 1-pin sockets for optional Borbely WCF buffer iteration, u22 cap for WCF price - measly 650E , plus 30E for Paypal , P&P expenses 3.Iron Turtle SE AVC (so no electronics), as assembled and tested unit (two irons on one common pcb) , rotary switch ,50cm flat cable finished, necessary stand-offs price - measly 450E , plus 30E for Paypal , P&P expenses 4.Iron Turtle (Bal) AVC (so no electronics) , as assembled and tested unit (one iron on one pcb but two pcbs stacked having same footprint as previous one) , rotary switch,50cm flat cable finished, necessary stand-offs price - measly 550E , plus 30E for Paypal , P&P expenses 5. Iron Pumpkin SE electronics ( so no AVC in package ) (yup , that one being for RCA inputs/outputs) ; that one consisting of : -two pcs of Iron Pumpkin SE mono pcbs (selector, shunt regs , buffer -all that on one pcb) , with all small SMD JFets presoldered , all BC bjt critters , voltage references , BD bjts for reg CCS ,all relays, Philips MKC 1uF caps , selector Lorlin switch with two finished flat cables, all multiturn trimpots , necessary 1-pin sockets for optional Borbely WCF buffer iteration, u22 cap for WCF price - measly 130E , plus 20E for Paypal , P&P expenses 6. Iron Pumpkin (Bal) electronics ( so no AVC in package)(yup , that one being for XLR inputs/outputs , possible combination with RCAs, read thread for that) ; that one consisting of : -two pcs of Iron Pumpkin (Bal) mono pcbs (selector, shunt regs , buffer -all that on one pcb) , with small SMD JFets presoldered , all BC bjt critters , voltage references , BD bjts for reg CCS ,all relays, Philips MKC 1uF caps , selector Lorlin switch with two finished flat cables, all multiturn trimpots , necessary 1-pin sockets for optional Borbely WCF buffer iteration, u22 cap for WCF price - measly 160E , plus 20E for Paypal , P&P expenses for all technical questions , visit linked thread for other questions - ask here or in PM considering prices from other vendors of AVC thingies , I believe this is pretty good bang for the buck shipping time from 1 to 4 weeks ......... sometimes things need to flow from Germany or China ...... and yes case/chassis needed : regular width , minimum 3HE

eve prvi oglas ....... http://www.diyaudio.com/forums/swap-meet/311916-iron-pumpkin-preamplifier-kits.html da prevodim za ovde ? popust za tuzemstvo .....

typo veliko opterecenje

turis bookshelf zvucnjak na stalak , turis po metra knjiga na bookshelf zvucnjak em zvuci bolje , em je istinito

I kako prosao danasnji brm-brm dan ? eve kako meni bilo : Vreme sugavo , kisa stane pa pocne od jutros skontam utanjilo se u kuci sa filter kahvom, a ja ovisnik ; gledim ceznjivo napolje da skontam kad ce shower da prekine bar na malo , da mogu da idem sa (bilo koja ) dva tocka umesto cetiri prestade , ja jedva docekah ...... ogrnem tanku jaknicu i turim kacigicu (za lokal) na glavu , odzujim do prve prodavnice ..... "tvoja kahva stize u utorak , sad nema!" odzujim do druge prodavnice istog lokalnog koncerna .......... same story izadjem iz prodavnice ..... kontam - isti lokalni koncern ima prodavnicu u seocetu 7km dalje ....... odzujim tamo , mmcu mu hladnjikavo u jaknici i kacigici sa 80 ....... tamo nema kahve moje izadjem iz prodavnice ..... kontam - isti lokalni koncern ima prodavnicu u sledecem seocetu 10km dalje ....... odzujim tamo , mmcu mu hladnjikavo u jaknici i kacigici sa 80 ....... tamo nema kahve moje izadjem iz prodavnice , krenu kapi kisice ......... 17km do kuce a ja u jaknici i kacigici zuj ..... 80....90.....100..... zuj stignem kuci , skinem kacigicu i jaknicu , obucem dzemper i skuvam crnu kavu

so , schmtcs are here both Pumpkins ( meaning - what's on electronic pcbs ) are completely compatible to be used as (still MIA) Iron Pre , not yet visible in DiyA Store so , selector - pot - buffer - autoformer ( be it everything SE or Bal) is good and certainly cheaper way , even if definitely few notches down. schematics are proven , so there is one (little more complicated ) possible substitution for Toshiba/LS approach. feel free to try it , on protoboard or PtP , your choice how it sounds ? well - foot-tapping , music is there ..... no thoughts about spectrum dividing , music is simply there and - I'm not responsible for that ( even if Genius) ..... that's simply nature of Good Iron ....... remember M2, F6 , Ultrasimple BAF Sony amp ?

did I forgot something ..... ? obviously - didn't uploaded some pics where applicable

bunch

more of Turtle

Iron Turtle details ....... if you see two Irons (pcb sandwiched in between) that's stereo pack Iron Turtle SE ; if you see one Iron on pcb , that's mono (Balanced) Iron Turtle

more of Bal

Now , on to Iron Pumpkin (Bal) ; block schematic similar , except few facts : -two buffers per channel -AVC/autoformer connected in differential manner ; again – there is intrinsic SUSY -error correction , whatever you choose to call it . Facts about construction written for SE, applies here also . -One AVC Iron on one pcb , so two pcbs for stereo ; Newest iteration of I. Turtle pcbs optimized for stacking , so footprint stays the same as for SE. -There is option for using any of 5 inputs as SE ; put RCA instead of XLR , mount 1N4148 diode in adequate position for energizing one additional relay and that’s it . Trick is to energize additional relay , to break connection between negative side buffer ( now being without signal ) and negative side of AVC; that way buffer’s output is not acting as virtual zero to negative VAC winding , thus not choking it. AVC is now fed solely through positive side winding , producing ( naturally) output on both sides/phases . So – you can use SE inputs from none to 4 …….. in case that you want all 5 of them being SE inputs , having Bal output …….. then either use SE amp , so choose Iron Pumpkin SE instead , or use Iron Pumpkin with your Bal input amp , but skimp on neg. buffer elements .

few pics

Time for few block schematics ; first Iron Pumpkin SE ( chinch, RCA , whatever) What’s shown are basic blocks – input selector , single buffer ( single phase , yup) fed with Good Gemini shunt reg , then AVC , with selectable input tap ; when fed to top – possible gain is odb , with chooice of tapping in to -2 to -8 db , respectively , so possible gain from 2 to 8db. Selector – simple 5-position rotary switch operating with 5 Takamisawa relays ; they’re good for industrial and medical instruments , so …. Good Gemini – simplified but also hot-rodded iteration of well known Shunty. Buffer – current mirror biased Diamond Buffer …… nothing new , but painstakingly to achieve same THD spectra as with Toshibas , luckily with even beter behavior under heavier loads. AVC – called Iron Turtle SE ,based on Toshiba Metglas (AMCC008) cores. Coil – 10H/100Rdc jobbie , as (always!!) compromise between needed Good Inductivity and several Bad Factors (known as Bad Capacitances , Bad Inductivity etc. …. in fact , using AVC instead of TVC is Bad Inductivity non existent ); insulation between layers is Teflon based , bobbins are/will be custom ones , everything PVC coated after assembly. Disclaimer – as for difference to almost all AVCs on market , these aren't intended to be Swiss Knife universal jobbies , they are constructed to be driven with buffer or , at least , pretty potent signal source apparatus. Two AVC Irons on one Iron Turtle pcb , so that’s enough for stereo. Switching again through Takamisawa relays ; flat cable going from Turtle pcb to front plate mounted 24 position Chinese Switch . Chinese Switch – even if made by carefully chosen group of Chinese Virgins , only during full moon nights , each one is gladly disassembled then greased with graphite grease then assembled again , by Mighty ZM himself.

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

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