PAPA'S KOAN ....... was Papa's Surprise - diyAudio
Go Back   Home > Forums > Amplifiers > Pass Labs

Pass Labs This forum is dedicated to Pass Labs discussion.

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 2nd October 2010, 07:15 PM   #1
Zen Mod is offline Zen Mod  Serbia
diyAudio Member
 
Zen Mod's Avatar
 
Join Date: Jan 2003
Location: ancient Batsch , behind Iron Curtain
Default PAPA'S KOAN ....... was Papa's Surprise

as some of you already know for preceding story : The Pass Pub: The High-End Off Topic Thread ...... 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, 1754 views)
File Type: jpg bottom blur.jpg (48.8 KB, 1715 views)
File Type: jpg front.jpg (44.0 KB, 2222 views)
File Type: jpg Graetzs.jpg (74.0 KB, 1723 views)
File Type: jpg IEC2.jpg (70.8 KB, 1682 views)
File Type: jpg IEC.jpg (77.2 KB, 954 views)
File Type: jpg PSU.jpg (85.3 KB, 584 views)
File Type: jpg shield.jpg (84.8 KB, 603 views)
File Type: jpg side blur.jpg (40.0 KB, 825 views)
__________________
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
  Reply With Quote
Old 2nd October 2010, 07:38 PM   #2
Zen Mod is offline Zen Mod  Serbia
diyAudio Member
 
Zen Mod's Avatar
 
Join Date: Jan 2003
Location: ancient Batsch , behind Iron Curtain
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 ......
__________________
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
  Reply With Quote
Old 2nd October 2010, 07:44 PM   #3
Zen Mod is offline Zen Mod  Serbia
diyAudio Member
 
Zen Mod's Avatar
 
Join Date: Jan 2003
Location: ancient Batsch , behind Iron Curtain
Default as I said - I'm lazy bstrd ......

so - 'nuff typing ; now random pics
Attached Images
File Type: jpg channel.jpg (36.1 KB, 900 views)
File Type: jpg channel-both-2.jpg (46.6 KB, 668 views)
File Type: jpg channel-both.jpg (54.9 KB, 587 views)
File Type: jpg channell-part.jpg (36.4 KB, 601 views)
File Type: jpg front.jpg (15.0 KB, 568 views)
File Type: jpg front-WS2.jpg (67.5 KB, 502 views)
File Type: jpg front-WS.jpg (38.7 KB, 545 views)
File Type: jpg full.jpg (24.4 KB, 3122 views)
File Type: jpg pc-setup.jpg (57.6 KB, 546 views)
__________________
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
  Reply With Quote
Old 2nd October 2010, 07:49 PM   #4
Zen Mod is offline Zen Mod  Serbia
diyAudio Member
 
Zen Mod's Avatar
 
Join Date: Jan 2003
Location: ancient Batsch , behind Iron Curtain
Default more.....

pics
Attached Images
File Type: jpg PK-action.jpg (24.2 KB, 1095 views)
File Type: jpg PK-off.jpg (27.6 KB, 123 views)
File Type: jpg topless-2.jpg (48.2 KB, 279 views)
File Type: jpg topless-3.jpg (67.0 KB, 488 views)
File Type: jpg topless.jpg (64.2 KB, 573 views)
File Type: jpg tweak-1.jpg (57.6 KB, 407 views)
File Type: jpg tweak-2.jpg (42.9 KB, 214 views)
File Type: jpg tweak-3.jpg (41.6 KB, 259 views)
File Type: jpg tweak-4.jpg (51.2 KB, 310 views)
__________________
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
  Reply With Quote
Old 2nd October 2010, 07:52 PM   #5
Zen Mod is offline Zen Mod  Serbia
diyAudio Member
 
Zen Mod's Avatar
 
Join Date: Jan 2003
Location: ancient Batsch , behind Iron Curtain
Default more more

pics pics
Attached Images
File Type: jpg tweak-5.jpg (62.0 KB, 333 views)
File Type: jpg tweak-6.jpg (71.0 KB, 293 views)
File Type: jpg tweak-7.jpg (48.5 KB, 314 views)
File Type: jpg tweak-8.jpg (54.6 KB, 230 views)
File Type: jpg tweak-9.jpg (67.9 KB, 213 views)
File Type: jpg tweak-10.jpg (59.6 KB, 242 views)
File Type: jpg wires.jpg (53.2 KB, 288 views)
__________________
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
  Reply With Quote
Old 2nd October 2010, 07:57 PM   #6
Zen Mod is offline Zen Mod  Serbia
diyAudio Member
 
Zen Mod's Avatar
 
Join Date: Jan 2003
Location: ancient Batsch , behind Iron Curtain
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



__________________
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
  Reply With Quote
Old 2nd October 2010, 07:58 PM   #7
Zen Mod is offline Zen Mod  Serbia
diyAudio Member
 
Zen Mod's Avatar
 
Join Date: Jan 2003
Location: ancient Batsch , behind Iron Curtain
and yes ..... sound ?

it sounds exactly as F4




( bummer is that now I'm forced to make that bloody )
__________________
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
  Reply With Quote
Old 2nd October 2010, 08:18 PM   #8
osscar is offline osscar  Latvia
diyAudio Member
 
osscar's Avatar
 
Join Date: May 2009
Location: Riga, LV
one word - fugly

p.s. ZM special edition or something...Very nice
__________________
If time is money then I'm out of time
  Reply With Quote
Old 2nd October 2010, 08:19 PM   #9
Zen Mod is offline Zen Mod  Serbia
diyAudio Member
 
Zen Mod's Avatar
 
Join Date: Jan 2003
Location: ancient Batsch , behind Iron Curtain
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
__________________
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
  Reply With Quote
Old 2nd October 2010, 08:52 PM   #10
diyAudio Member
 
zeonrider's Avatar
 
Join Date: Mar 2004
Location: Belgrade RS
Fuuuuuugly!

  Reply With Quote

Reply


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Papa's new toys Holger Barske Pass Labs 14 15th January 2007 10:21 AM


New To Site? Need Help?

All times are GMT. The time now is 07:50 PM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright 1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2