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Old 29th February 2012, 12:01 AM   #1
tim614 is offline tim614  United States
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Default pp KT88, IT phase splitter

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.
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Old 29th February 2012, 02:15 AM   #2
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Quote:
Originally Posted by tim614 View Post
im hoping this is pretty close to my goal of running class A.
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.
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Old 29th February 2012, 03:36 AM   #3
tim614 is offline tim614  United States
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Thanks hollow!
Well AB it is, I'm not too worry about it being class a, just wanted to build a bad *** pp amp.
Being new at this I want to confirm with the fellow diyer.
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Old 29th February 2012, 04:36 AM   #4
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That is a very contemporary design and look you have going on there. It's a great balance with the tubes.
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Old 29th February 2012, 04:57 AM   #5
tim614 is offline tim614  United States
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Quote:
Originally Posted by overtheairbroadcast View Post
That is a very contemporary design and look you have going on there. It's a great balance with the tubes.
Thanks!
I'll post my progress as I go
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Old 29th February 2012, 05:59 AM   #6
jam is offline jam  United States
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Tim,

Nice looking design.

Any schematics possibly for us to look at?

Jamv
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Old 29th February 2012, 01:42 PM   #7
tim614 is offline tim614  United States
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this amp is base on the andrea ciufolli shchematic on audiodesignguide
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Old 29th February 2012, 06:53 PM   #8
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this amp is base on the andrea ciufolli shchematic on audiodesignguide
Can you post up the picture here please?
Also what does the meter measure?
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Old 29th February 2012, 07:21 PM   #9
tim614 is offline tim614  United States
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Originally Posted by Globulator View Post
Can you post up the picture here please?
Also what does the meter measure?
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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Old 10th May 2012, 02:01 PM   #10
tim614 is offline tim614  United States
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Default update

finally got them hook up, been playing for about a month now (50-60hrs) sound very good so far.
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