Which amp is better for sound quality, one of these SR or 100W Ultimate Fidelity Amplifier AX14?
OK no problem ..... 🙂
Regards Alex
Dear Alex, I see D7 wrong polarity on the PCB board in post # 1625 🙂
Regards,
Yassud
Good catch! That explains the odd voltages I saw. I will change that today and retest.
Thanks, Terry
Thanks, Terry
I wonder if a moderator can help you replace the file in that post or at least add a note in that post to refer to a corrected file. I spent a few hours trying to get the amp working properly and somehow I got it to play but not well enough so it ended up on a shelf. I have replaced the diode but didn't have time to test. I will get to it later today.
Blessings, Terry
Blessings, Terry
My sr200 copyright by apex, pcb design by me

An externally hosted image should be here but it was not working when we last tested it.
An externally hosted image should be here but it was not working when we last tested it.
Nice work,
Regards
Hi all.
I'm trying to make psu of sr50
but It's my first time making amp
and there's something I need your help
1. i see two 2SC5200 in schematic
but there's only one in pcb
is this pcb wrong? or is this ok?
2. and.. what is that 2k2 resistor tie to MPSA42//MPSA92 ?
just simple resistor or something else?
i don't know what to buy..
3. my hometown use 220v AC,
what transformer i should buy?
is this ? ( 220v AC primary // 2x40v AC secondary )
4. right side of trans, 4 diode making diamond
and the number 35A/400V
what is this?
I'm trying to make psu of sr50
but It's my first time making amp
and there's something I need your help
1. i see two 2SC5200 in schematic
but there's only one in pcb
is this pcb wrong? or is this ok?
2. and.. what is that 2k2 resistor tie to MPSA42//MPSA92 ?
just simple resistor or something else?
i don't know what to buy..
3. my hometown use 220v AC,
what transformer i should buy?
is this ? ( 220v AC primary // 2x40v AC secondary )
4. right side of trans, 4 diode making diamond
and the number 35A/400V
what is this?
Attachments
Hi all.
I'm trying to make psu of sr50
but It's my first time making amp
and there's something I need your help
1. i see two 2SC5200 in schematic
but there's only one in pcb
is this pcb wrong? or is this ok?
2. and.. what is that 2k2 resistor tie to MPSA42//MPSA92 ?
just simple resistor or something else?
i don't know what to buy..
3. my hometown use 220v AC,
what transformer i should buy?
is this ? ( 220v AC primary // 2x40v AC secondary )
4. right side of trans, 4 diode making diamond
and the number 35A/400V
what is this?
Start with some simple like AX6 for your first amp,
Regards
SR100F
Some picture of my SR100F, singing very good, relaxing....
Offset can be set to zero with trimpot, testing only with 25 mA bias because heatsink is too small.
Some picture of my SR100F, singing very good, relaxing....
Offset can be set to zero with trimpot, testing only with 25 mA bias because heatsink is too small.
Attachments
Some picture of my SR100F, singing very good, relaxing....
Offset can be set to zero with trimpot, testing only with 25 mA bias because heatsink is too small.
Nice work, what FET is used?
Regards
I use 2SK117.
Regards
VAS transistor is not MJE340/350 on your amp?
VAS transistor is not MJE340/350 on your amp?
Yes, it's KSE, hard to find genuine MJE340/350 here.
Yes, it's KSE, hard to find genuine MJE340/350 here.
Ok, can you share your SR100F final schematic?
Regards
Final schematic on post #1700.Ok, can you share your SR100F final schematic?
Regards
I will share pcb later.
Regards
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