100W Ultimate Fidelity Amplifier

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#6,661
xrk971 said:
ApexAudio,
How many watts is this design good for and what size power supply do you suggest? (VA rating)
I just got a shipment of 10 pairs of 2SC5200 and 2SA1943's for $7 😀
Might be the perfect place to put them to work. Is their a PCB layout for this amp by anyone on the forum yet?
This design uses matched input LTP's to avoid having offset adjustment pot?
Thanks for all your contributions to new amp designs which we are having a good time building.
Since their are so many amps, which ones are your personal favorites for good sound quality at the 50w class? I have heard someone say it is the FX8. Is that true?
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500VA for mono or 1000VA for stereo, power is 600W/2R maximum.
PCB you can find in post #6628.
A40 is my favorite amp and P30 preamp.
Regards
 
#6,663
xrk971 said:
That PCB on that post does not appear to be the same as the AX10 schematic and is a work in progress still by Sonal Kumar.
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Vbe multiplier with BD139 instead 4x1N4148 is only diference compare to BX20.
 

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#6,666
apexaudio said:
500VA for mono or 1000VA for stereo, power is 600W/2R maximum.
PCB you can find in post #6628.
A40 is my favorite amp and P30 preamp.
Regards
Click to expand...

Thank you Mr. Mille for your statement on your preference (favorite APEX amp) 🙂😀
I was sure FX8 your favorite but it look like you still prefer the A40 over that. (Maybe from a simple small amp FX8)?
I would love to build your favorite to!
I know FX8 is a simple small amplifier compare to A40 , to me the final result more important even if cost $$$ more or I have to invest more time and energy , I do have most of the semis at hand you use at A40 just need to find the layout and the build instruction or information .😀
Cheers gabor
 
#6,667
gaborbela said:
Thank you Mr. Mille for your statement on your preference (favorite APEX amp) 🙂😀
I was sure FX8 your favorite but it look like you still prefer the A40 over that. (Maybe from a simple small amp FX8)?
I would love to build your favorite to!
I know FX8 is a simple small amplifier compare to A40 , to me the final result more important even if cost $$$ more or I have to invest more time and energy , I do have most of the semis at hand you use at A40 just need to find the layout and the build instruction or information .😀
Cheers gabor
Click to expand...

Yes FX8 is my favorite simple small amp, and if you compare complexity vs sound quality it is beter than A40.
I like simple amps there is A9, AX9, FX9, AX10, AX11...
 
#6,668
gaborbela said:
Thank you Mr. Mille for your statement on your preference (favorite APEX amp) 🙂😀
I was sure FX8 your favorite but it look like you still prefer the A40 over that. (Maybe from a simple small amp FX8)?
I would love to build your favorite to!
I know FX8 is a simple small amplifier compare to A40 , to me the final result more important even if cost $$$ more or I have to invest more time and energy , I do have most of the semis at hand you use at A40 just need to find the layout and the build instruction or information .😀
Cheers gabor
Click to expand...

Hi gaborbela,
Its like asking a parent which of his/her child is better😀. But answer given by Mr. Mile is perfect!! :up::up:
reg
Prasi
 
#6,670
apexaudio said:
Yes FX8 is my favorite simple small amp, and if you compare complexity vs sound quality it is beter than A40.
I like simple amps there is A9, AX9, FX9, AX10, AX11...
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Thanks for the clarification. FX8 is still best small amp (good news because I have some PCB's ordered and arriving soon).

Can you please point me to where AX40 schematic and PCB layout is?

Thank you.
 
#6,671
prasi said:
Hi gaborbela,
Its like asking a parent which of his/her child is better😀. But answer given by Mr. Mile is perfect!! :up::up:
reg
Prasi
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Yes you right . But so many times parents have favourite child.
And sometime in real life they do have!
A do not say that is correct but we are humans.
I do not care about the complexity (I will build it ones and I have a lot of semis at hand, I etch my own PC boars) I care about the final result.
Also Mr. Mile is right (I can understand his statement) if the sound difference (too) small better to chose the simple one (easier to build)
Usually like the CF symmetrical amplifiers but I read so many time LTP front end with Voltage feedback can have some advantage over the mentioned CF. I know on these people has different opinion.. So hard to decide
Al do I like the CF I (I would always pick the CF) give a chance to the FX8 and after the CF FX9.. 😀 To get some experiment. 😀
Greetings
 
#6,676
apexaudio said:
FX8 and LinePre with OPA2134 is my favorite simple VFA amp and preamp, FX9 is favorite simple CFA amp,
SR250 and SR PP12 is favorite VFA amp and preamp,
A40 and P30 is favorite CFA amp and preamp...
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Hi Mile,

I don't think I had ever tried the A40 together with the P30 so this morning I hooked them up. OH MY!!!! Talk about a power house. This thing was rattling my windows. I don't remember the last time I felt bass like that. Like someone was punching me in the chest. I have got to get this in a cabinet. Too good to reside in the amp pile. Thanks for suggesting it.

Blessings, Terry
 

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#6,678
I have got to get this in a cabinet. Too good to reside in the amp pile. Thanks for suggesting it
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Aren't you guys glad I asked? Can't believe no one has asked Mr ApexAudio all this time. I was wondering what it takes for an amp to get past the "I soldered it up and it's now singing" stage, destined for Still4given's amp "heap", to getting a real case with connectors and knobs. 🙂
 
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