The Singing Bush

Official Court Jester
Joined 2003
Paid Member
OK ........ I've been wowking on the waiwwoad ......

YouTube

still THF51S at heatsink , tried 2A4 Iq , measurements at 1W comparable with 3A Iq, both for 30v and for 35V set at output node;

tried 2A Iq , same thing ........


Removed THF51S , took random 2SK182ES and did some playing ......

at 2A and 2A4 for Iq , opposite behavior comparing to THF - smaller THD at lower voltage at node

dialed back to 3A Iq and made set of measurements for 30V and 35V at output node ..........
 
Official Court Jester
Joined 2003
Paid Member
Singing Bush 2SK182ES , 8R load , 30V output node

........
 

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  • Singing Bush 2SK182ES 30W 8R 30V node.png
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Official Court Jester
Joined 2003
Paid Member
Singing Bush 2SK182ES , 8R load , 35V output node

see 3rd !!!
 

Attachments

  • Singing Bush 2SK182ES THD vs.Freq 8R 35V node.png
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  • Singing Bush 2SK182ES 30W 8R 35V node.png
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Official Court Jester
Joined 2003
Paid Member
Singing Bush 2SK182ES , 4R load , 30V output node

.......
 

Attachments

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  • Singing Bush 2SK182ES FR 4R 30V node.png
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  • Singing Bush 2SK182ES 41W 4R 30V node 10%.png
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  • Singing Bush 2SK182ES 40W 4R 30V node.png
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  • Singing Bush 2SK182ES 30W 4R 30V node.png
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  • Singing Bush 2SK182ES 1W 4R 30V node.png
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Official Court Jester
Joined 2003
Paid Member
Singing Bush 2SK182ES , 4R load , 35V output node

......
 

Attachments

  • Singing Bush 2SK182ES THD vs.Freq 4R 35V node.png
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  • Singing Bush 2SK182ES FR 4R 35V node.png
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  • Singing Bush 2SK182ES 39.5W 4R 35V node 10%.png
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  • Singing Bush 2SK182ES 30W 4R 35V node.png
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  • Singing Bush 2SK182ES 20W 4R 35V node.png
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  • Singing Bush 2SK182ES 10W 4R 35V node.png
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  • Singing Bush 2SK182ES 5W 4R 35V node.png
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Official Court Jester
Joined 2003
Paid Member
The Larch! 8R load

removed wires from puny 2SK182ES , removed protecting cover form The Larch , mounted gain pcb again on The Larch, and put The Larch in good use ......

The Larch!

my EMU1212 setup didn't had enough cojones to move The Larch to 10% THD , so that's why I stopped at lower
 

Attachments

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  • Singing Bush 30W 8R.png
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  • Singing Bush 1W 8R.png
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Official Court Jester
Joined 2003
Paid Member
The Larch! 4R load

for this , Cojones for 10% were there
 

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  • Singing Bush 30W 4R.png
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  • Singing Bush 10W 4R.png
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  • Singing Bush 1W 4R.png
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  • Singing Bush THD vs. Freq 4R.png
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Official Court Jester
Joined 2003
Paid Member
Conclusions .....

Is it worth to make Lesser Larch/slightly Hysteric Singing Bush, either with THF51S or 2SK182ES ?

Having an eye on last lhquam's musings - he's Da Man when Math and Scientific approach are needed - SIT measurements, Mu Follower, and amplifier build ........ I'll put back TH51S these days and play little more with basic factors (rail voltage, Iq .... dunno what can be done varying Mu gain) trying to find most satisfactory combo of THD vs. power and Cojones

Anyway , even with presented/tried basic factors , I would go and build any of these - whatever you have in drawer

if you don't have it and you intent to - maybe is little better to opt for THF

as I said the other day , I have pair of monoblocks to make for my Polish guy ...... old cases of his (now) defunct Aleph X monoblocks are crying for some heat ...... :)