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The Singing Bush
The Singing Bush
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Old 6th February 2020, 08:53 PM   #11
Zen Mod is offline Zen Mod  Serbia
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The Singing Bush
now , show time !!

ZM's half pcb removed from my Preciousssss, made some security cover for same , took random THF51ES and connected with short wires , so Poor Man's ZM's amp ( you can call it Vienna Boy's Choir amp , if you like )

was lazy to organize isolator sheet for THF , so entire heatsink is sorta live , at SIT drain potential - approx 30Vdc
Attached Images
File Type: jpg IMG_20200206_191704.jpg (68.4 KB, 796 views)
File Type: jpg IMG_20200206_191700.jpg (110.9 KB, 801 views)
File Type: jpg IMG_20200206_191656.jpg (97.7 KB, 903 views)
File Type: jpg IMG_20200206_191648.jpg (86.4 KB, 776 views)
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File Type: jpg IMG_20200206_191617.jpg (125.4 KB, 217 views)
File Type: jpg IMG_20200206_191603.jpg (135.4 KB, 258 views)
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Old 6th February 2020, 08:56 PM   #12
Zen Mod is offline Zen Mod  Serbia
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now, sole pic - explanation later

see - 35Vdc , set at output node ........ so THF Ugs is a smidge lower (3A x 0R2)

DVMs showing - 60Vdc rail , 600mV across 0R2 , output node potential
Attached Images
File Type: jpg IMG_20200206_191549.jpg (115.8 KB, 385 views)
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Old 6th February 2020, 09:04 PM   #13
Zen Mod is offline Zen Mod  Serbia
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Default The Singing Bush - THF51ES - yelling!!! at 8R

night was young ........... ok , it wasn't even night yet

so , why not inducing few Greedy Boyz smiling tonight ..... simply because I know that Regular Greedy Boy expects daily dose of graphs , to sleep peacefully

see few things :

- Singing Bush THF thinks ........ no - it's convinced that he is Toob amp!! (10% THD at full power is normal thing)

-THD ( 1W@8R) , keeping 30V5-31Vdc at output node is nearly doubled , comparing to where I moved it - at 35Vdc

-visible clip at scope starts at 32W/8R

- good to have ballsy buffer - it shows in FR , also in THD vs. Freq. graph
Attached Images
File Type: png Singing Bush THF 1W 8R.png (44.1 KB, 404 views)
File Type: png Singing Bush THF 5W 8R.png (50.7 KB, 214 views)
File Type: png Singing Bush THF 10W 8R.png (51.7 KB, 155 views)
File Type: png Singing Bush THF 20W 8R.png (54.2 KB, 135 views)
File Type: png Singing Bush THF 30W 8R.png (58.9 KB, 125 views)
File Type: png Singing Bush THF cliping at 32W 8R.png (62.1 KB, 131 views)
File Type: png Singing Bush THF 40W 8R.png (66.9 KB, 130 views)
File Type: png Singing Bush THF 50W 8R.png (67.7 KB, 118 views)
File Type: png Singing Bush THF FR 8R.png (50.4 KB, 134 views)
File Type: png Singing Bush THF51THD vs. Freq 8R.png (47.3 KB, 125 views)
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Old 6th February 2020, 09:10 PM   #14
Zen Mod is offline Zen Mod  Serbia
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Default The Singing Bush -THF51ES - yelling!!!!!! cheerfully at 4R

I have no intention to pursue finer tuning than this ( 60V/3A/35VUds) , I'm happy as is

from these graphs you can see:


- Singing Bush THF is convinced that he's Toob amp with Big Cojones , and 4R tap , besides

-slipping is around 40W , and I wasn't in the mood to eek my eyes at that softness ..... nice and easy soft rounding of sine crest .... who cares
Attached Images
File Type: png Singing Bush THF 1W 4R.png (47.7 KB, 175 views)
File Type: png Singing Bush THF 5W 4R.png (49.1 KB, 144 views)
File Type: png Singing Bush THF 10W 4R.png (50.7 KB, 96 views)
File Type: png Singing Bush THF 20W 4R.png (51.7 KB, 96 views)
File Type: png Singing Bush THF 30W 4R.png (52.0 KB, 96 views)
File Type: png Singing Bush THF 40W 4R.png (54.3 KB, 90 views)
File Type: png Singing Bush THF FR 4R.png (50.0 KB, 109 views)
File Type: png Singing Bush THF THD vs. Freq 4R.png (47.7 KB, 102 views)
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Old 6th February 2020, 09:11 PM   #15
hirscwi is offline hirscwi  United States
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The Singing Bush
I'm afraid if I tried this, it would be "burning bush" without Moses...
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Old 6th February 2020, 09:13 PM   #16
Zen Mod is offline Zen Mod  Serbia
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Tomorrow I'll repeat same battery of tests with random 2SK182ES ( now I'm confused - is ES with 182 , or is it with THF51 ....... or is it with both ? .... lazy to check on pics)

will post that , and then maybe day later , will repeat same battery of tests with Schade Mos Puck .......... and then maybe day later , will repeat same battery of tests with My Preciousssssssssssss




time for some reading and nap

.......
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Old 6th February 2020, 09:16 PM   #17
Ben Mah is offline Ben Mah  Canada
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Muy Bueno, Amigo!!
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Old 6th February 2020, 09:52 PM   #18
Zen Mod is offline Zen Mod  Serbia
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The Singing Bush
Default I forgot some numbers ......... THF51 down:

rail 61Vdc

output node set to 35V

Iq 3A

8R clip at 16V2rms= 32W

4R clip approx 40W

gain for 5Vrms out :

4R - 468mVrms ; 10.68V/V , 20.57db

8R- 355mVrms ; 14.08V/V , 22.97db
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Old 6th February 2020, 10:23 PM   #19
cubicincher is offline cubicincher  Germany
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Clapping hands!


Greets
Dirk


p.s.: my 50W- SE- Schade- amp is also alive....
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Old 6th February 2020, 10:34 PM   #20
Nelson Pass is offline Nelson Pass  United States
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