after a long year, i just now got one "some what" button up so here's the update.
PP KT88 IT phase splitter MONO BLOK, cathode bias for now, 6n6p driver tube.
B+1 = 573v
cathode V = 63v (573v-63v = 509v plate Voltage) @ 126ma / 2 = 63ma per tube.
B+2 = 123v
cathode v = 3.39 @ 23ma
im hoping this is pretty close to my goal of running class A.
if im missing something please let me know.
as of firing it up there were no hum what so ever, sounds clean and tight, i only play it long enough for testing.
BTW: i hve the tube rec on pic but are using Solid state Rec for now, have not yet decide till its all done.
PP KT88 IT phase splitter MONO BLOK, cathode bias for now, 6n6p driver tube.
B+1 = 573v
cathode V = 63v (573v-63v = 509v plate Voltage) @ 126ma / 2 = 63ma per tube.
B+2 = 123v
cathode v = 3.39 @ 23ma
im hoping this is pretty close to my goal of running class A.
if im missing something please let me know.
as of firing it up there were no hum what so ever, sounds clean and tight, i only play it long enough for testing.
BTW: i hve the tube rec on pic but are using Solid state Rec for now, have not yet decide till its all done.
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That's a very nice looking amplifier. A traditional style that's right up my alley. But in my book, 500 volts at 63mA is class AB not A, assuming you're talking about the output stage. You would have to increase the current substantially and lower the voltage to run class A and stay within the KT-88's dissipation. But that sort of defeats the advantage of a PP output stage.
the meter is "bias meter". the amp is Cathode bias right now but will be "Fix bias" as soon as i get the pair build.
Push-Pull Amplifier
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Thank you all for the great comments!
@Tim, Very nice amplifiers you got there
thanks for sharing the pictures, schematics look very simple, just what I need for a starter amplifier and with no negative feedback
Anyone know more about rectification?
@Eli Duttman wrote that I could get slight more bass from using diode's instead of tube.
Is there more I should know about this? i'm not sure yet whether I should go for silicon or tube rectifier.
@TheGimp, I'm going to drive Bowers & Wilkins CM7 loudspeakers I just like to have some overkill in the amplifier.
I'm not listening loud, and lots of music styles so I want an amplifier that is not limited since i'm going to build it why not have some power reserve
@Tim, Very nice amplifiers you got there
thanks for sharing the pictures, schematics look very simple, just what I need for a starter amplifier and with no negative feedback Anyone know more about rectification?
@Eli Duttman wrote that I could get slight more bass from using diode's instead of tube.
Is there more I should know about this? i'm not sure yet whether I should go for silicon or tube rectifier.
@TheGimp, I'm going to drive Bowers & Wilkins CM7 loudspeakers I just like to have some overkill in the amplifier.
I'm not listening loud, and lots of music styles so I want an amplifier that is not limited since i'm going to build it why not have some power reserve
The pp are now playing for about 6 month and are not tube rec anymore, I use solid state diodes and like it better, as for the amp underneath its indeed the abdellah design. I don't have the SE kt88 anymore it found a new home.
The difference in sounds between the two amps to me is that the SE have a slight mellower sounds, the PP just rocks!
The difference in sounds between the two amps to me is that the SE have a slight mellower sounds, the PP just rocks!
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