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PAPA'S KOAN ....... was Papa's Surprise
PAPA'S KOAN ....... was Papa's Surprise
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Old 2nd October 2010, 08:15 PM   #1
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PAPA'S KOAN ....... was Papa's Surprise
Default PAPA'S KOAN ....... was Papa's Surprise

as some of you already know for preceding story : http://www.diyaudio.com/forums/pass-...ml#post2264960 ...... I'm blessed with Papa's Suprise ...... ( where is that "notworthy" smiley when you need it ..... ) .

there is rest of story .
I'm certainly one of not many , having opportunity to dismantle FW chassis in pieces ; as Papa likes AR2 , he didn't put usual Donut and caps in it , probably counting on fact that Vladimir will bring it all the way on his shoulder ( not having enough trust in Air baggage departments ) ......
anyway - little jewel box is even without these few parts heavy enough ...

so - to have Papa's Surprise Amp in working condition I had to do few things :

.... install new Donut ; what I already had on my shelf is just right (to squeeze in ) size - 4x18Vac/800VA ; according to that - decision to use 2 Graetzs per channel is logical , same as dedicated filter bank per channel .
so - 2x18Vac windings , two bricks , 4x 33mF/25 Panas , along with 2x 0R1 in CRC ; all that per channel
I didn't want to make new holes in bottom plate , so nice Cu plate is cut and bent , to serve as donut and bricks holder . I also made new filter pcb ( wisely sprayed in black ) , while Papa's original one , along with two finest original FW Chinese Porcelain 35A bricks will end in some less demanding project ( maybe some HP amp ) .

power wiring is made from finest quality cut-in-dust LS cable , produced by local factory

Donut squeezed in sandwich (top & bottom ) of soft rubber ; my usual praxis for all toroids ; you can rotate it few degrees and move about 5mm side wise , but it's secured completely

so - few pics for start ( I'm lazy bstrd , so random order is my native state)
Attached Images
File Type: jpg back.jpg (29.7 KB, 2197 views)
File Type: jpg bottom blur.jpg (48.8 KB, 2150 views)
File Type: jpg front.jpg (44.0 KB, 3360 views)
File Type: jpg Graetzs.jpg (74.0 KB, 2166 views)
File Type: jpg IEC2.jpg (70.8 KB, 2121 views)
File Type: jpg IEC.jpg (77.2 KB, 1153 views)
File Type: jpg PSU.jpg (85.3 KB, 741 views)
File Type: jpg shield.jpg (84.8 KB, 751 views)
File Type: jpg side blur.jpg (40.0 KB, 1678 views)
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clean thread; Cook Book;PSM LS Cook Book;Baby DiyA ;Mighty ZM's Bloggg;Papatreasure;Papa... by Mighty ZM
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Old 2nd October 2010, 08:38 PM   #2
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PAPA'S KOAN ....... was Papa's Surprise
so......

Papa sez that pcbs are from early pre-production ; meaning that pcb itself is right as schematic posted in first post in famous F4 thread ; later and final iteration have few changes - mainly with goal to save and secure tiny fragile input Jfets from excessive input signal which , in case of amplitude greater than actual F4 working voltage , will burn them in silent puff

I had dilemma few days - leave it as is , counting on fact that I don't need much of input amplitude for my spks ...... or to tweak pcb a little and make it according to final schematic ; naah ....... as Papa sez in one e-mail - " I though that you will put something else in that case " , decision was made - I'll leave present as is , but I must play with it a little ; so - every butcher detail you'll see on pics is made as change to that schm .

electrolytics are my fave - Elna 470uF/35V/125C , maybe because I have few kilos of them ;
bypasses on two Elnas in power filtering are 100n/some-film-who-really-care-which-type ; bypasses on two signal carrying Elnas are 10n MKC - polycarbonats

one funny thing is - major-trouble issue for Vladimir , and also major-laughing issue for me - fact that front plate was badly scratched in transport (probably bubble-wrap slipped and back side of zip in Samsonite made those scratches ) ,exactly where Papa's Surprise sticker is put , on pics in linked post above ;
I had instantly cunning plan ( I'm pretty often in Baldrick mode) to send front plate in capable hands of local Metal Guru - Leonardo ( nick on Baby Diya) ;
said and later managed - Leo cleaned existing elox , brushed , made new elox and Fugly! new logo .
possible similarity with existing FW logo is pure coincidence , of course , and your's Mighty ZM is responsible for that coincidence

I know that my fave Dutchie Jaccovitty is dumb as Dutchie Whale , so here is link to wikipedia - meaning of Koan ..... for his eyes and education only : K?an - Wikipedia, the free encyclopedia

why "Koan" ?

just because Papa's crumbs , thrown in ZM's direction , are usually 3 times stiffer than his usual PassDiyA crumbs ......
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Old 2nd October 2010, 08:44 PM   #3
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PAPA'S KOAN ....... was Papa's Surprise
Default as I said - I'm lazy bstrd ......

so - 'nuff typing ; now random pics
Attached Images
File Type: jpg channel.jpg (36.1 KB, 1137 views)
File Type: jpg channel-both-2.jpg (46.6 KB, 838 views)
File Type: jpg channel-both.jpg (54.9 KB, 733 views)
File Type: jpg channell-part.jpg (36.4 KB, 773 views)
File Type: jpg front.jpg (15.0 KB, 727 views)
File Type: jpg front-WS2.jpg (67.5 KB, 594 views)
File Type: jpg front-WS.jpg (38.7 KB, 638 views)
File Type: jpg full.jpg (24.4 KB, 3966 views)
File Type: jpg pc-setup.jpg (57.6 KB, 652 views)
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Old 2nd October 2010, 08:49 PM   #4
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PAPA'S KOAN ....... was Papa's Surprise
Default more.....

pics
Attached Images
File Type: jpg PK-action.jpg (24.2 KB, 1375 views)
File Type: jpg PK-off.jpg (27.6 KB, 142 views)
File Type: jpg topless-2.jpg (48.2 KB, 338 views)
File Type: jpg topless-3.jpg (67.0 KB, 590 views)
File Type: jpg topless.jpg (64.2 KB, 705 views)
File Type: jpg tweak-1.jpg (57.6 KB, 514 views)
File Type: jpg tweak-2.jpg (42.9 KB, 280 views)
File Type: jpg tweak-3.jpg (41.6 KB, 328 views)
File Type: jpg tweak-4.jpg (51.2 KB, 380 views)
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clean thread; Cook Book;PSM LS Cook Book;Baby DiyA ;Mighty ZM's Bloggg;Papatreasure;Papa... by Mighty ZM
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Old 2nd October 2010, 08:52 PM   #5
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PAPA'S KOAN ....... was Papa's Surprise
Default more more

pics pics
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File Type: jpg tweak-5.jpg (62.0 KB, 409 views)
File Type: jpg tweak-6.jpg (71.0 KB, 372 views)
File Type: jpg tweak-7.jpg (48.5 KB, 398 views)
File Type: jpg tweak-8.jpg (54.6 KB, 294 views)
File Type: jpg tweak-9.jpg (67.9 KB, 276 views)
File Type: jpg tweak-10.jpg (59.6 KB, 310 views)
File Type: jpg wires.jpg (53.2 KB, 363 views)
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my Papa is smarter than your Nelson !
clean thread; Cook Book;PSM LS Cook Book;Baby DiyA ;Mighty ZM's Bloggg;Papatreasure;Papa... by Mighty ZM
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Old 2nd October 2010, 08:57 PM   #6
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PAPA'S KOAN ....... was Papa's Surprise
now ZM in brokenrecord-mode -

tnx to Papa ....... AR2 .........

final touch was Leo's gesture - he didn't want to take any money for refurbishing front plate and beautiful gravure job ........

where's that "notworthy" smiley when Humble ZM need it



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Old 2nd October 2010, 08:58 PM   #7
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PAPA'S KOAN ....... was Papa's Surprise
and yes ..... sound ?

it sounds exactly as F4




( bummer is that now I'm forced to make that bloody )
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Old 2nd October 2010, 09:18 PM   #8
osscar is offline osscar  Latvia
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one word - fugly

p.s. ZM special edition or something...Very nice
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My DIY so far: two Leach amps, Pass AB100, Pass F5, B1 buffer, Hiraga le monstre, two LM3875, LM1875, OPA549, 6C33C SE, GU32 PP, 6p3c-e PP, Marsh headphone amp.Phono - OBH-8se, Pacific RIAA, inDiscreet Phono, Whammy headphone amp.
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Old 2nd October 2010, 09:19 PM   #9
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PAPA'S KOAN ....... was Papa's Surprise
tip :

if you want to save surface around screw holes from damage , use plastic washers ;

if you don't have plastic washers handy - DIY them - from roentgen foils

all you need are ( what's proper word) - hole making tool and scissors .

funny - I have full box of these foils in A3 format, scavenged from local health center ...... they're good for many things in electronic
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Old 2nd October 2010, 09:52 PM   #10
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Fuuuuuugly!

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