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The Singing Bush
The Singing Bush
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Old 6th February 2020, 09:12 PM   #1
Zen Mod is offline Zen Mod  Serbia
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The Singing Bush
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Well , we all know funny Laws of Life .......... to achieve Plethora of Pinjatas , one must find The Singing Bush , and fathom real role, place and importance of said Phenomena in search for Greater Pastures



so , let's refresh a memory ........ The Singing Bush

as you probably know , I was on Pilgrimage (end of last year) to Sea Ranch .... to have few walks by the Open Ocean , collect some wood flown to shore ..... and to remind Pa that life isn't serious thing at all

who sez that patience and good eye are not things good to have ?

good eye spotted that Pa is not having a Loo in ( or by) his workshop;

patience is needed to catch a moment when Pa must go to Loo ( in da House) , while forgetting to shoot me outa Workshop and lock ..........

so - result is - I came back home with pair of 2SK77B Tokins , being so damn lucky that Pa didn't count them in da Shoe-box , prior to packing me in Variac's car .... ( he drove me to Snoopy Airport)

anyway , what to do with just a pair of them ...... I can't make just one Digital Domain channel ...... still using stereo in my systems ; have no money left for another Pilgrimage so fast and , besides , Pa would say "we are not home!!" even without counting what's left of Tokins in shoe-box...

so , must be some SE ........

luckily , eye and patience again - I recollect watching funny vid , Pa's Lecture at BAF 2015 , where he presented ZM's 50W SE Amp , and also Peasant (rest of Greedy Boyz) iteration , where he cheated , forcing one vulgar mos puck to behave SIT-like ,, with help of some Schade feedback , obtained with nice input xformer

coincidentally - we recently had some fun in 2sk77b

I already posted some pics and back'o'napkin sketches there , but here we go again , posting everything here , to have it complete in one place

to start with , for your amusement , picture of Alcatraz Federal Penitentiary

edit on 13.02.2020: I forgot that all Pa's BAF 2105 Lecture slides, due M. Rothacher's nicety , are available here for download (besides some other interesting things from Mr. MR) :

Articles | AudioMaker
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File Type: jpg IMG_20191110_135118.jpg (81.3 KB, 1086 views)
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clean thread; Cook Book;PSM LS Cook Book;Baby DiyA ;Mighty ZM's Bloggg;Papatreasure;Papa... by Mighty ZM

Last edited by Zen Mod; 13th February 2020 at 06:27 AM.
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Old 6th February 2020, 09:18 PM   #2
Zen Mod is offline Zen Mod  Serbia
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see , ZM's 50W SE Amp , as Papa kindly constructed it ......

it's clever to watch entire vid I linked in previous post ....... you can learn few things , especially about heat
Attached Images
File Type: jpg Baldrick.jpg (13.8 KB, 1052 views)
File Type: jpg ampp.jpg (73.5 KB, 1073 views)
File Type: jpg 09 2SK77B-DAMP.jpg (69.3 KB, 1070 views)
File Type: jpg 10 2SK77B-DFRQ.jpg (84.6 KB, 1033 views)
File Type: jpg 11 2SK77B-RESP-1.jpg (81.4 KB, 146 views)
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Old 6th February 2020, 09:22 PM   #3
Zen Mod is offline Zen Mod  Serbia
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making amps simply by schematic ( even drawn by Papa ) is boring ....... while making it absolutely and utterly unnecessary more complicated is ......fun ; besides , there is just one M2 amp , which (we all know) is best amp ever made and sole one which is sacrilege to change

so , what I concocted is something as this (broken in two halves, upper and lower , so easier to combine common upper Mu-block with different lower halves)

so , Mu first
Attached Images
File Type: png The Singing Bush Mu schm.png (44.7 KB, 507 views)
File Type: png The Singing Bush Mu pcb sshot.png (55.4 KB, 510 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 6th February 2020, 09:24 PM   #4
Zen Mod is offline Zen Mod  Serbia
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then, ZM's half
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File Type: png The Singing Bush gain schm.png (54.3 KB, 483 views)
File Type: png The Singing Bush gain pcb sshot.png (58.6 KB, 468 views)
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Old 6th February 2020, 09:27 PM   #5
Zen Mod is offline Zen Mod  Serbia
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then Peasant half


as already habit - when using nice signal repeater coil , I'm putting footprints for all 3 usual suspects - Edcor, Jensen, Cinemag
Attached Images
File Type: png The Singing Bush PMEgain schm.png (57.0 KB, 404 views)
File Type: png The Singing Bush PME gain pcb sshot.png (84.7 KB, 376 views)
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Old 6th February 2020, 09:29 PM   #6
Zen Mod is offline Zen Mod  Serbia
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The Singing Bush
I started populating pcbs probably a week ago
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File Type: jpg IMG_20200124_134514.jpg (129.2 KB, 211 views)
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File Type: jpg IMG_20200128_002114.jpg (68.1 KB, 184 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

Last edited by Zen Mod; 6th February 2020 at 09:35 PM.
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Old 6th February 2020, 09:34 PM   #7
Zen Mod is offline Zen Mod  Serbia
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then few days ago , finally did first thing - testing in vivo Mu block

it behaves , Iq set at 30V (half of rail in amp) , steady 3A , behaving nicely .... no hiccups and surprises

10K trimpot enabling fine setting of Iq

observe fuse holder

T4A , keeper of good mood
Attached Images
File Type: jpg IMG_20200205_142859.jpg (112.2 KB, 264 views)
File Type: jpg IMG_20200205_142904.jpg (70.4 KB, 254 views)
File Type: jpg IMG_20200205_143312.jpg (74.7 KB, 220 views)
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Old 6th February 2020, 09:39 PM   #8
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Fugly!!!
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Old 6th February 2020, 09:43 PM   #9
twitchie is offline twitchie  Canada
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The Singing Bush
3.2A * 28V = 89.6W on the lower device, minimum 180W Tdp or is this only for hockey pucks?

Did you have the upper half connection to OUT fixed at the middle point or is it still possible to connect at different points in the resistor string?
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Old 6th February 2020, 09:43 PM   #10
Zen Mod is offline Zen Mod  Serbia
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Patience ,my dear Watson ........ and Courage!!



that's what's needed when playing with rare and precious toobz

yesterday I followed connecting ZM's half to Mu , enabling full 60V rail , and testing how entire shebang behaves in DC domain

can't be more satisfied .......

voltage potential at output node ( inner side of output cap) ramps up to some 17V nicely fast , then hesitates a little , and goes smoothly to 31V (where I decided to set it) , as Mu starts conducting

3m3 across Opto- Governor is seriously slow to be charged , exactly as intended
Attached Images
File Type: jpg IMG_20200205_145530.jpg (52.6 KB, 253 views)
File Type: jpg IMG_20200205_145906.jpg (86.9 KB, 221 views)
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File Type: jpg IMG_20200205_182717.jpg (82.4 KB, 160 views)
File Type: jpg IMG_20200205_183340.jpg (134.3 KB, 207 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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