Build hybrid amp but with 2sk1058 compli

mikefromaus · 2nd March 2008, 01:35 PM

Hi,

I wish to build the hybrid valve+fet amp on the following page http://digilander.libero.it/essentia...id_circuit.htm but using 2 pairs of 2sk1058/2sj162 instead of the irf9540/540 as per the diagram.
Is there any major modification required? Also will changing the output stage affect the response or linearity?
Also do I connect the second pair with its own source and gate resistor to the same point or do I just share the gate resistor and add only a source resistor?
I am looking to get about 35 watts output, but anything over 20 would be acceptable.
Thank you for your suggestions, I am looking at using this amp to replace my main listening amplifier.

AndrewT · 2nd March 2008, 03:26 PM

Hi,
the hybrid + schematic shows the paralleled FET output stage.
The BUZ alternatives shown are Lateral FETs similar to the 2sk/j devices.

What temp compensation keeps the vertical FET CCS at near constant current.

mikefromaus · 3rd March 2008, 07:31 AM

Hi again,

How do you mean? Is there a problem with this design?

Thank you.

dexter · 3rd March 2008, 08:39 AM

you should look at john broskie site,
He wrote about the problem with tha design.

2nd March 2008, 01:35 PM	#1
mikefromaus diyAudio Member Join Date: Dec 2007	Build hybrid amp but with 2sk1058 compli Hi, I wish to build the hybrid valve+fet amp on the following page http://digilander.libero.it/essentia...id_circuit.htm but using 2 pairs of 2sk1058/2sj162 instead of the irf9540/540 as per the diagram. Is there any major modification required? Also will changing the output stage affect the response or linearity? Also do I connect the second pair with its own source and gate resistor to the same point or do I just share the gate resistor and add only a source resistor? I am looking to get about 35 watts output, but anything over 20 would be acceptable. Thank you for your suggestions, I am looking at using this amp to replace my main listening amplifier.

2nd March 2008, 03:26 PM	#2
AndrewT diyAudio Member Join Date: Jul 2004 Location: Scottish Borders	Hi, the hybrid + schematic shows the paralleled FET output stage. The BUZ alternatives shown are Lateral FETs similar to the 2sk/j devices. What temp compensation keeps the vertical FET CCS at near constant current. __________________ regards Andrew T.

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3rd March 2008, 07:31 AM	#3
mikefromaus diyAudio Member Join Date: Dec 2007	Hi again, How do you mean? Is there a problem with this design? Thank you.

3rd March 2008, 08:39 AM	#4
dexter diyAudio Member Join Date: Apr 2001	you should look at john broskie site, He wrote about the problem with tha design.

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