Class A Amplifier/Topology

[Tukkar]

yep mas efficient nga yung push pull kesa dito...kaya lang sabi kasi ni Mr. nelson pass mas maganda pa rin daw tunos ng SE yun nga lang 25% efficent lang sya....

[tony]

SE produces 2nd harmonics which are cancelled in a push-pull stage...

[Tukkar]

yun nga siguro and wala sa PP kaya yung iba mas preffered nila ang SE even in Tube amps...

[Johannah Aleksandria]

nakita ko sa Pass, for a 10W amp, it includes 4 active output and 4 for current source, so 4 pairs for each channel.
Ilan ba ang gamit mo sis?
Fewer output results in higher temp. Dapat kasing iwasan na tumaas yung temp sa isang component.

[Tukkar]

2 pairs of 150w power mosfet( 4 nmos per channel)..2 hrs running after 2 hrs d mo na mahawakan hsink kahit 5 second lang. binawasan ko na lang yung bias sa 1.5 amp pero bumaba lang ng kaunti yung init...lastly sa 1 ampere na lang sya kaso mga mahina na...

[Johannah Aleksandria]

Kung TO-220 yan, mganda cguro kung palitan mo ng bigger profile.
Ang mganda kasi sa heatsink ay yung fins, to give more exposed surface, kagaya ng sa processor.
Kaya kung chassis lang, ok kung napakalaki ng thermal mass(makapal), pero limited pa rin ang exposed surface.

[roltex_rohit123]

use it as transformer coupled load. or iin a push pull configuration. It will give nearly 50% efficiency.

[Tukkar]

T0=247 ang power mosfet, heatsink fins ang kulang kaya dadagdagan,

CCS loaded ito kaya medyo mataas na rin ang effeciency nya compared sa resistor or choke loaded...

[ricdelros]

SE produces 2nd harmonics which are cancelled in a push-pull stage...

In some amount, second harmonics aren't objectionable -- they're the octaves of the notes going in, and contribute to a "Sweetening" or "Thickening" of the sound. A single-ended amp (if no negative feedback is used) will produce a lot of 2nd harmonics before it even starts clipping.

[tony]

^yes, that is the "magic" of single ended designs, the 2nd harmonics......that is what makes those amps euphonic.....http://www.thefreedictionary.com/euphonic

[efren]

How's that 6C33C single ended going sir tony, i would love to hear that beast sing!

[tony]

How's that 6C33C single ended going sir tony, i would love to hear that beast sing!

2 weeks pa siguro..i will invite you for a listening session...

[ricdelros]

^yes, that is the "magic" of single ended designs, the 2nd harmonics......that is what makes those amps euphonic.....http://www.thefreedictionary.com/euphonic

...and one of my books that explains some of the Vacuum Tubes situations...

[efren]

2 weeks pa siguro..i will invite you for a listening session...

ayos, sir tony i will bring a few CD's if u don't mind

[tony]

ayos, sir tony i will bring a few CD's if u don't mind

yes, please do....

[Tukkar]

we will wait and see the final outcome of these russian triodes at work....

[sub1sec]

subs po, very very interested po...

thank you...

[Tukkar]

siguro nabuo na ni sir tony yung 6c33c amp nya...that's a triode amp na mas maganda daw kesa pentodes and tetrodes...let us hear and see....

[tony]

ssssssshhhhh....... a few more days.....working on the soft-start and delay controllers.....

[Johannah Aleksandria]

Sir Efren i'm planning for a Class a on a guitar amp, gaano mo ba ginawa ang JLH? gaano kalaki ang heatsink at operating voltage.