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Old 23rd June 2012, 07:29 AM   #811
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There are already 3 pairs of output transistors, are you asking for a 4th pair?
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Old 23rd June 2012, 07:38 AM   #812
Harry3 is offline Harry3  Australia
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Yes I would like to use 4 pairs - for 4ohm or less loads.

Last edited by Harry3; 23rd June 2012 at 07:50 AM.
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Old 23rd June 2012, 07:53 AM   #813
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With a substantial amount of heatsink, the original 3 pair output can already drive 4 ohms loads with gusto as long as your psu can also handle it. I did try it for home hifi only though, not for a party rig. It also used the recommended output transistors, I did not upgrade to the big ones.
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Old 23rd June 2012, 08:10 AM   #814
Harry3 is offline Harry3  Australia
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Re-reading Andrew's post 751 - he was refering to two pairs of output transistors, only being able to drive 6 ohms. So I assume 3 pair would be enough for 4 ohms. However I would prefer to have 4 pairs on the ouput.
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Old 23rd June 2012, 10:16 AM   #815
AndrewT is offline AndrewT  Scotland
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Yes, I was referring to a 2pair output stage using those transformer voltages.
The actual load capability will depend on how you build the amplifier and how hot you run it and what PSU you use and what your view on reliability vs de-rated SOAR you have.

Personally, I would carry out a modeling of the amplifier PSU+Output stage & Driver stage to assess what it's load capability could be. That is beyond many Members here, so I posted a quick and easy guide.
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Old 23rd June 2012, 10:42 AM   #816
naf is offline naf  Indonesia
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Would it still good performance if i build HB using mje340/350 instead of ksc3503/ksa1381?
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Old 23rd June 2012, 10:44 AM   #817
AndrewT is offline AndrewT  Scotland
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If you don't know, then don't modify.
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Old 23rd June 2012, 10:56 AM   #818
naf is offline naf  Indonesia
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Sir, i.m not modify it. I read on build guide there is alternative for 3503/1381.
If still good using 340/350 i would like to build, if don't i'll try another
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Old 23rd June 2012, 11:23 AM   #819
AndrewT is offline AndrewT  Scotland
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I would not recommend 340/350 as substitutes for 1381/3503
The only parameter they have in common is 300Vceo.

D1 & D2 are not 1n914 @ 1A as stated in the BOM. These should preferably be rectifier diodes, 1n4001 or similar.
1n914 are signal diodes.
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Old 23rd June 2012, 12:04 PM   #820
Harry3 is offline Harry3  Australia
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Andrew thanks.
If I build this amp I would use 500VA transformers for each channel and large heat sinks. So the power supply should not be an issue. I would like the amp to be able to drive 4ohm or less drivers and hence my question of using 4 pairs on the output.
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