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-   -   pp KT88, IT phase splitter (http://www.diyaudio.com/forums/tubes-valves/207770-pp-kt88-phase-splitter.html)

tim614 28th February 2012 11:01 PM

pp KT88, IT phase splitter
 
2 Attachment(s)
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.

HollowState 29th February 2012 01:15 AM

Quote:

Originally Posted by tim614 (Post 2927092)
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.

tim614 29th February 2012 02:36 AM

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.

overtheairbroadcast 29th February 2012 03:36 AM

That is a very contemporary design and look you have going on there. It's a great balance with the tubes.

tim614 29th February 2012 03:57 AM

Quote:

Originally Posted by overtheairbroadcast (Post 2927335)
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

jam 29th February 2012 04:59 AM

Tim,

Nice looking design.

Any schematics possibly for us to look at?

Jamv

tim614 29th February 2012 12:42 PM

this amp is base on the andrea ciufolli shchematic on audiodesignguide

Globulator 29th February 2012 05:53 PM

Quote:

Originally Posted by tim614 (Post 2927699)
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?

tim614 29th February 2012 06:21 PM

1 Attachment(s)
Quote:

Originally Posted by Globulator (Post 2928061)
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

tim614 10th May 2012 01:01 PM

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


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