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. 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?
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 any progress ?
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.
digging deep any 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
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 .......
would it make sense to try classAB with Toshiba 2sk1530/2sj201 ?
beware of output mosfets polarity !
(sources to out )
noted, thanks
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