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Old 22nd February 2013, 12:19 PM   #1851
44250 is offline 44250  Serbia
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100r 2W should send smoke,at that place you should place about 20R 5 - 10W with voltmeter connected in parallel so that you could monitor the voltage across the resistor. it may be that bias trim. was set to adjust say 250mA of current so 100r and 250mA would produce 6,26W and 25V at that resistor,but on 20r that would be 1,25W and 5V on voltmeter.
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Old 22nd February 2013, 12:35 PM   #1852
olafk is offline olafk  Germany
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You are right. I will test it on the weekend. I had lately only little time for hobbies.
regards Olaf
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Old 22nd February 2013, 12:56 PM   #1853
cjkpkg is offline cjkpkg  United States
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Originally Posted by apexaudio View Post
with this circuit add to AX14 no need to set bias and no need for bias transistor on heatsink with outputs.
I am still learning - so forgive the noob question but is this auto bias scheme "fixed" or "variable"?

How do you set the target value?
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Old 22nd February 2013, 01:33 PM   #1854
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I am still learning - so forgive the noob question but is this auto bias scheme "fixed" or "variable"?

How do you set the target value?
Bias is fixed but you can change resistor 3k3 with 3k6, 3k9, 4k3... to set target value.
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Old 27th February 2013, 09:45 PM   #1855
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Hello apexaudio.

Can you give me some advice in what transistors i can us instead of the mje340/mje350 pair?

I can't find this transistors (the mje 340 i found only at my local parts store)

I tried using BD139/BD140 but the amplifier distorts a lot at even about 10% of the ouput power.

So i have mounted some KTA1023/KTC1027 found in an auto amplifier.
the 2sc4793/2sa1837 (can't find them either) i have replaced with bd243c/bd244c.

The suply voltage i am using is +/- 42v.

Thanks.
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Old 28th February 2013, 09:27 AM   #1856
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Originally Posted by mrdevil83 View Post
Hello apexaudio.

Can you give me some advice in what transistors i can us instead of the mje340/mje350 pair?

I can't find this transistors (the mje 340 i found only at my local parts store)

I tried using BD139/BD140 but the amplifier distorts a lot at even about 10% of the ouput power.

So i have mounted some KTA1023/KTC1027 found in an auto amplifier.
the 2sc4793/2sa1837 (can't find them either) i have replaced with bd243c/bd244c.

The suply voltage i am using is +/- 42v.

Thanks.
There is some eror on your amp, it must work with BD139/140 and BD243C/244C.
Regards
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Old 28th February 2013, 09:24 PM   #1857
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D12 made in Serbia
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Last edited by apexaudio; 28th February 2013 at 09:26 PM.
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Old 2nd March 2013, 07:34 PM   #1858
cjkpkg is offline cjkpkg  United States
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OK I changed out the PSU I etched in favor of peter Daniel's universal PSU with vishay GBC rectifiers. 22,000uF x2 per rail and voltage has settled in at about 42.

I decided to try biasing the crap out of it and have been running 1.6A per channel for a couple hours and holy cow this amp ROCKS.

Preamp is an aikido 6cg7 input 5687 output.

The iPod, vinyl, and satellite music all sound fabulous.

I will have to debug my diy PSU...I thought it would have been quiet but it hummed like a mutha.
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Old 2nd March 2013, 08:06 PM   #1859
olafk is offline olafk  Germany
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Originally Posted by apexaudio View Post
Do you use wire jumper?
Regards
Amplifier is running. I made the complete wiring (PSU, Amp...) new and had to changed R16 from 1k to 1k5 to adjust the bias. Layout seems to be correct.

regards Olaf
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Old 3rd March 2013, 06:08 AM   #1860
panggih is offline panggih  Indonesia
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Mr, Mike ax14 I've completed three times, but I have a problem, when I turned, shouted directly ax14 mixed humm.please help me.
ax14 mine exactly with this picture.
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