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Old 6th January 2013, 05:33 AM   #901
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Thanks OS for clarifying about this amp, some members exibit blown transistors, maybe because of faulty parts. This amp is real God like..!!.. if built properly and nicely...
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Old 6th January 2013, 06:28 AM   #902
naf is offline naf  Indonesia
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wow thank you kean, your expalanation will take time for me to fully understand.
but when i build this honey badger i try to match as i could following part
q1/q2
q7/q8
q5/q6
r3/r6
r8/r9
r15/r16
r20/r21
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Old 7th January 2013, 01:12 AM   #903
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Quote:
Originally Posted by ostripper View Post
Member Keentoken also has a point about the current mirrors.

Replacing Q 5/6 would be simple , only the pair would be back-back instead of face-face. This improved current balance would indeed reflect on the sonics .. even if only by a small amount. This is explained in Hugh Dean's AKSA threads.
This is wrong information. Q5/6 are installed facing the same way on the board. Also KSA992 are ECB layout and BC560 CBE layout so it is not as simple to mirror them around as one has Collector center pin and other has a base center pin.
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Old 7th January 2013, 01:21 AM   #904
naf is offline naf  Indonesia
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Quote:
Originally Posted by niss_man View Post
This is wrong information. Q5/6 are installed facing the same way on the board. Also KSA992 are ECB layout and BC560 CBE layout so it is not as simple to mirror them around as one has Collector center pin and other has a base center pin.
correct niss_man, i have to bend my bc560 leg and isolate using heatshrink tube.
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Old 18th January 2013, 07:55 PM   #905
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Sorry for wrong info.
To redeem myself , here is a pin for pin equivalent:
http://www.mouser.com/ds/2/149/KSA1015-61942.pdf
KSA1015.

These match the BCxxx's typical characteristics almost exactly. http://www.mouser.com/ds/2/149/BC556-193550.pdf
Use the GR gain group. Buy extra's to match as Keen suggests (.10c at mouser).

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Old 18th January 2013, 08:10 PM   #906
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That's a great find! They are probably even better, as you can see in the Fairchild BC560 datasheet there is a droop at 1V/50uS, but not for the japanese part. Only drawback is the lower Hfe. I will have to try these in my Kmultipliers whenever I have the chance.

Unfortunately the NPN part, KSC1815 doesn't show Vcesat comparable to the BC550. Possibly, the BC327-40 and KSC1015 are the ultimate BJT pair for low-Vce linearity. If Ft match is desired, BC550/KSC1015 both should still work great. However I want to test this to make sure.
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Old 18th January 2013, 08:16 PM   #907
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I was a little rusty(wrong info). But since I was going to order some (ksa1015's) , I thought it should be "shared".

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Old 1st February 2013, 06:26 PM   #908
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Can you see if this is correct?
Click the image to open in full size.
R7+R8 constrained the dial to block overcurrent settings (did I do it right?)
R29+R30 constrained the dial to block overcurrent settings (did I do it right?)
R27 changed per information in this thread (and from there I just guessed)
Q5,Q6 changed per information in this thread (does it affect Q3, Q4?)
Q14,Q15 changed to avoid severe mismatch (onsemi's low HFE new China fab NPN)
Q16,Q17,Q19,Q20 per information in this thread, 50,50v rails, 8 ohm speaker
Marked all higher current resistors
C4, changed to a reasonable value for higher resolution bass with non-ringing treble
D3 indecipherable, "different compensation options" indecipherable and therefore these need checked out too.
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Last edited by danielwritesbac; 1st February 2013 at 06:31 PM.
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Old 1st February 2013, 09:16 PM   #909
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If someone could send me some xSA1015 I could confirm whether they will be best here. That would be nice since Dan has already posted a huge schematic showing them. However I don't expect to see any significant deviation from the datasheet.
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Old 2nd February 2013, 11:08 AM   #910
cod3gen is offline cod3gen  Norway
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Not sure if its the right place,
but i wanted to give this amp a try. However, my PSU is at +-85v on load.. Would maybe be a bit too much when running this on 4r speakers? How would the amp handle it, do i need to change something, maybe add a pair or two of output transistors?
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