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The Singing Bush Tips 'n' Tricks
The Singing Bush Tips 'n' Tricks
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Old 18th July 2020, 03:43 PM   #1
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The Singing Bush Tips 'n' Tricks
Default The Singing Bush Tips 'n' Tricks, so even Cheerleader Girlie can build it ...

....OK , here it is

ORIGIN THREAD : The Singing Bush


First few posts with graphical info, then I'll write separate posts for both amps, explaining few details


////////

however , most important thing when starting, applicable for both amps:

be sure that trimpot in buffer negative rail (lower JFet group source) is set to max position, prior to first powering up - check that measuring across parallel 39R resistor - reading must be close to 28R

/////////

another thing - remove that silly blue collar from needle wire terminal you got from me - either use heat gun or heat it with solder or lighter ...... then pull it

all wires need to be crimped then soldered in wire terminals, then heatshrinked, to look nice

///////// ( you can see from these slashes that I spent some time recently struggling with Arduino )

for 2SK77B - lucky bstrdz having these - all 3W resistors in Mu part of amp - they are still 1R/3W , no change ........... Iq 3A2, output node or SIT Drain (what's easier to reach for measurement) set at approx U/2

///////////

edit 27.07.2020. - SIT Singing Bush startup procedure , post #29
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Last edited by Zen Mod; 27th July 2020 at 08:48 PM.
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Old 18th July 2020, 03:46 PM   #2
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The Singing Bush Tips 'n' Tricks
Default The Singing Bush SIT iteration

yup, this one is with THF51/2SK182/2SK180 in lower position

I know that few lucky bstrdz are having 2SK77B , to use there ....

I didn't drew input RCA and twisted pair of thin wires for that , you'll manage
Attached Images
File Type: png The Singing Bush THF51_2SK180_2SK182 MU schm.png (51.2 KB, 2550 views)
File Type: png The Singing Bush THF51_2SK180_2SK182 Gain schm.png (55.9 KB, 2545 views)
File Type: jpg SIT-AMP-arrangement.jpg (271.8 KB, 2988 views)
Attached Files
File Type: pdf SIT AMP arrangement.pdf (120.7 KB, 170 views)
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Old 18th July 2020, 03:48 PM   #3
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do not reply - yet!

I'll finish later (evening, my time) with all MOS iteration, then you can ask/yell/complain/tease/praise/curse

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Old 18th July 2020, 04:05 PM   #4
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This is what the A+B+C kit looks like.
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File Type: jpg Singing Kit.jpg (462.1 KB, 2530 views)
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Old 18th July 2020, 04:20 PM   #5
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The Singing Bush Tips 'n' Tricks
Default The Singing Bush Schade, All MOS, Poor Man Edition, whatever

pics self explanatory
Attached Images
File Type: png Singing Bush Mu part schm.png (47.9 KB, 2392 views)
File Type: png Singing Bush Schade lower part schm.png (57.3 KB, 483 views)
File Type: jpg MOS-AMP-arrangement.jpg (289.6 KB, 553 views)
Attached Files
File Type: pdf MOS AMP arrangement.pdf (97.9 KB, 67 views)
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Old 19th July 2020, 06:28 PM   #6
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Default Trial Placement

It's going to be a tight squeeze. More so than the Zen v4 boards were.
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File Type: jpg Trial Placement1.jpg (342.8 KB, 637 views)
File Type: jpg Trial Placement2.jpg (347.0 KB, 652 views)
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Old 19th July 2020, 06:44 PM   #7
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you need different set of 3W resistors , for THF

what you did solder is - all 1R/3W, adequate for Schade or 2SK77B SIT
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Old 19th July 2020, 06:57 PM   #8
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Oops. Ok, let's get this corrected. What do I need to run the big THF part?

I haven't found any info on the schematics, though the parts list had two lines crossed out, I could not understand what the preferred installation was.
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Old 19th July 2020, 07:37 PM   #9
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I think I figured out what I need for the THF-51. According to post #97 in the Singing Bush thread, we are trying to create the equivalent of a string of six 0R1 resistors, with the tap point 0R2 from the bottom, and 0R4 from the top.

So my bottom resistors are correct, but the top resistors need to be 3x 1R5 and 1x 2R2 for a total of 0.407 Ohms. Yes?
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Old 20th July 2020, 01:20 AM   #10
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schm in very first post of this thread.....


oops, very second post of this thread

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