Hi Juma,
Greetings. I was searching for a power amp to build. I like JFET input stage and I want to use Lateral Mosfet for output. I found Zenquito then this one using K2013/J313 as VAS. Everything fits the bill. This seems like another gem of yours.
Hard to believe this thread was buried this deep.
My diy buddy helps draw a pcb for this version of F5 as the attachment. Do you think it worth using regulated ps for input and VAS stages?
Greetings. I was searching for a power amp to build. I like JFET input stage and I want to use Lateral Mosfet for output. I found Zenquito then this one using K2013/J313 as VAS. Everything fits the bill. This seems like another gem of yours.
My diy buddy helps draw a pcb for this version of F5 as the attachment. Do you think it worth using regulated ps for input and VAS stages?
Attachments
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Of course - as every gain stage does, this front end will also appreciate clean and Low Z power supply.... Do you think it worth using regulated ps for input and VAS stages?
Hard to believe this thread was buried this deep.
digging deep
Built the amp. Worked very well, sounded very nice I've asked my friend to rework the pcb layout for 3 pr of output devices, cascode the input stage, balanced operation, and etc. ![Big grin :D :D](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)
digging deepany progress ?
Sorry, forgot the attachment
is that a cascoded input for higher voltage/output ?
while you're fresh with it - will you try it in B class ?
...... with small bias current the amp sounds a bit "thin". With 0.5A it's really good and marginally better with 1A per MOSFET.
if lower bias current, maybe it would help with higher voltage
![scratch2 :scratch2: :scratch2:](https://files.diyaudio.com/forums/images/smilies/scratch2.gif)
Yes, it's so that I can use higher voltage supply for higher output with 1.2A~1.5A bias.
is that a cascoded input for higher voltage/output ?
would it work in high biased class AB
it will
remember original Hitachi schematics , and all other derivatives .......
![scratch2 :scratch2: :scratch2:](https://files.diyaudio.com/forums/images/smilies/scratch2.gif)
beware of output mosfets polarity !
(sources to out )
noted, thanks
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