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DIY Class-A 2SK1058 MOSFET Amplifier Problem
DIY Class-A 2SK1058 MOSFET Amplifier Problem
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Old 8th June 2019, 07:25 AM   #21
hifisucks is offline hifisucks  Germany
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Forgot where I purchased the k1058s... but I will now never again buy from eBay or such areas...
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Old 8th June 2019, 02:04 PM   #22
ivanlukic is offline ivanlukic  Serbia
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hifisucks,

I am inclined to believe that everything is OK with your amp and the problem is that you don't understand the circuit you are using. With 24VDC it is perfectly OK to have 11VDC (around one half of supply voltage) on the amp side of output cap. The loudspeaker cone movement at turn on is also OK for most amps, not only single supply kind.

If you are "dazed and confused" (like Led Zeppelin once was) play your amp on some cheap speaker for test.

It's easy to conclude if your K1058 is original. Only lateral MosFETs like K1058 have GSD pinout. See the pic in the original project.
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Old 8th June 2019, 02:34 PM   #23
hifisucks is offline hifisucks  Germany
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Yes, I didnt understand the curcuit ... but I knew how to set Bias for each channel...
One guy on the analog-forum here in germany said to controll the offset output...
And I didnt think right... so I just stuck the meters in + and - without load... :-)
Not thinking about the curcuit... :-)
I have original Hitachi 2SK1058... :-)
All the best!
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Old 14th June 2019, 02:11 PM   #24
soundbrigade is offline soundbrigade  Sweden
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Quote:
Originally Posted by hifisucks View Post
Forgot where I purchased the k1058s... but I will now never again buy from eBay or such areas...
REICHELT!
That's next door to you ....
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Old 14th June 2019, 02:39 PM   #25
hifisucks is offline hifisucks  Germany
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You are right, I buy lot at Reichelt... be at that time he had no k1058s... :-)
All the best!
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Old 14th June 2019, 02:53 PM   #26
soundbrigade is offline soundbrigade  Sweden
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I am into the exact same project but with a slight modification, a triode driver.

2SK1058 Hybrid Amp

But lack of ideas for a suitable chassis has stopped the project so far.
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Old 15th June 2019, 07:11 AM   #27
thimios is offline thimios  Greece
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Quote:
Originally Posted by soundbrigade View Post
REICHELT!
That's next door to you ....
Buy Exicon from Profusion.
Original for sure.

Last edited by thimios; 15th June 2019 at 07:20 AM.
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