100W Ultimate Fidelity Amplifier

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#1,023
apexaudio said:
This pcb is OK,
Regards
Click to expand...
Ok, then continue...
some pictures
this is how I made my "hand made PCB" :scratch2::scratch2:
maybe useful to someone else
made it with steel needle, permanent marker & scratch :scratch2::scratch2::scratch2:
scratch with a piece of cutter blade that I tied in a pencil to correct the drawing
I hope that picture enough to explain what I'm doing

@dodoet
if we add another 2 pair it is not AX14 anymore, maybe you can make AX20 instead, don't forget to share
see page 92...
I'm also have a plan to add 1 pair more to AX17 but maybe it not necessary
made same or close to the schematic first then we can modifies later


Regards
 

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#1,029
My AX17s duel

apexaudio said:
Use 47uF and 47pF,
Regards
Click to expand...
ok, almost done...
for testing I will use "bulb tester"
It is same as testing AX14?
And for bias
2 volt on 100nF or 15 mV on 0R33? What is the ideal voltage there?
I will supply 32v from transformer or better with lower voltage first?

I make 2 AX17 with different transistor, hope that not any problem happen 🙂

Regards
 

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#1,030
JOHN BALI said:
ok, almost done...
for testing I will use "bulb tester"
It is same as testing AX14?
And for bias
2 volt on 100nF or 15 mV on 0R33? What is the ideal voltage there?
I will supply 32v from transformer or better with lower voltage first?

I make 2 AX17 with different transistor, hope that not any problem happen 🙂

Regards
Click to expand...

Nice work, yes testing is same as AX14 and set 15mV on 0R33 for bias (50mA)
Regards
 
#1,034
passed 1st test

apexaudio said:
Voltage 2x32vac on transformer will be OK, but you must disconnect transistors from heatsink, use liskun isolator.
Click to expand...
Like this picture?

I'm happy now, thanks to Apex
🙂🙂🙂
These AX17s just passed the test easily
the sound is very clear even I use ugly speaker without enclosure
just for first test...
both of AX17's offset are very low, I try to hear any hum but nothing on that speaker just like it was disconnected from the amp
maybe my cheap digital tester was broken, I also can't measure voltage on 0R33.

my AX17s not use trimpots, because i don't trust trimpot that I bought.
I replace 220 + 1k trimpot with single 330ohm resistor & I got about 2.30volt on C7(100nF)
Is this voltage need to be increase or decrease?
AX17 using TEF right, or just similar look?
so if I increase to 3,2volt(with big heatsink & enought supply) it is possible?
because there was someone told me that he run the TEF amp with 3,2volt bias voltage, even more..

For other DIYer you also need to try this AX-series
I also want to make the AX14 like what Apex recommended 🙂 to compare with this AX17.
As usual with new way hand made PCB(my version)


Thanks again

Regards
 

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#1,036
JOHN BALI said:
Like this picture?

I'm happy now, thanks to Apex
🙂🙂🙂
These AX17s just passed the test easily
the sound is very clear even I use ugly speaker without enclosure
just for first test...
both of AX17's offset are very low, I try to hear any hum but nothing on that speaker just like it was disconnected from the amp
maybe my cheap digital tester was broken, I also can't measure voltage on 0R33.

my AX17s not use trimpots, because i don't trust trimpot that I bought.
I replace 220 + 1k trimpot with single 330ohm resistor & I got about 2.30volt on C7(100nF)
Is this voltage need to be increase or decrease?
EAX17 using TEF right, or just similar look?
so if I increase to 3,2volt(with big heatsink & enought supply) it is possible?
because there was someone told me that he run the TEF amp with 3,2volt bias voltage, even more..

For other DIYer you also need to try this AX-series
I also want to make the AX14 like what Apex recommended 🙂 to compare with this AX17.
As usual with new way hand made PCB(my version)


Thanks again

Regards
Click to expand...
Any sound difference SanKen vs Toshiba
 
#1,037
Okay, so I need to increase it to 3,2volt & also measure voltage on both 0R33
the more important is the voltage on those resistor. Ok, I get it

apexaudio said:
TEF for 4 ohm load.
Click to expand...
I just go back on this page, TEF for 4 ohm load
If there any possibility to try this amp on 2 ohm load?
Maybe on 2 x 25 vac
I just want to know 🙂
my plan is used this amp on 8ohm speaker

Any sound difference SanKen vs Toshiba

When I test it at first time I don't use good speaker
but I hear a little sound difference SanKen vs Toshiba
Toshiba seems clearer (mid high) than SanKen, but the bias not really fair I guess
since Sanken maybe need a more bias (my guess)
I will set proper bias then
I will make it sure when I finish this project
Perhaps I also can make visual measurement with any PCscope

Regards
 
Last edited:
#1,038
JOHN BALI said:
Okay, so I need to increase it to 3,2volt & also measure voltage on both 0R33
the more important is the voltage on those resistor. Ok, I get it


I just go back on this page, TEF for 4 ohm load
If there any possibility to try this amp on 2 ohm load?
Maybe on 2 x 25 vac
I just want to know 🙂
my plan is used this amp on 8ohm speaker

Regards
Click to expand...

For 2 ohm add another pair of outputs, and VI limiter is recomanded, but for home audio it's work without changes.
 
#1,039
AX14

I have made PDF file, if someone want print more PCB in one page A4, everything is a mirror reflection for thermo-transfer.
 

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