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RE: differential phase splitter for the PP power ampilifier

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Allen Wright

In Reply to: RE: differential phase splitter for the PP power ampilifier posted by RCA805 on September 15, 2009 at 22:11:55

>>I am your fans. I need to spend more than ten years to understand your pre-amp cook book & your article on Sound Practice.And I am still keep reading to learn more<<

Great, keep on it!

>>I saw the circuit. Is it OK to use E288CC instead of 6H30?<<

THe 6H30 is better, because you can use a lot more current, and to directly drive output tubes, you need LOTS of current.

> It should be better than ECC88<<

Maybe, but not much. 6H30 is a far better choice.

> BTW, why the circuit need to have current source loading instead of a resistor <<

It doesn't. All my circuits use resistive loading.

Are you confusing this with the CCS in the cathodes? That's NOT the loading, and is used because it sounds far better than using a resitor to a high negative voltage.

>>( just like the text book differential amplififer). Is it enough gain of a signle stage drvier? In fact, I agree that only one stage should be better than two stage 6SN7 differential driver design<<

It is far better, by actual test. And it has enough gain.

Regards, Allen (Vacuum State)

Follow Ups:

RE: differential phase splitter for the PP power ampilifier - RCA805 06:16:39 09/17/09 (1)
Hi Allen

> > I saw the circuit. Is it OK to use E288CC instead of 6H30? < <

THe 6H30 is better, because you can use a lot more current, and to directly drive output tubes, you need LOTS of current.

How about 5687 or E182CC? they has more power dissiplation. I don't have 6H30 on hand.

> BTW, why the circuit need to have current source loading instead of a resistor < <

It doesn't. All my circuits use resistive loading.> > >

I saw the lower ECC88 has connected with upper ECC88 with Fixed biase on the gride. SO, I guess the 2nd ECC88 is a current source. What is this circuit? I don't see on the text book.

Wilson
- It's called a CASCODE circuit. - Allen Wright 08:48:35 09/17/09 (0)
  If it's not in your text book, you need a better text book!
  
  Try Valley & Wallmann "Vacuum Tube Circuits". That's where the cascode was first revealed. (Page 440)
  
  The cascode is a series connection of a common cathode stage under a common grid stage.
  
  Very wide bandwidth, high gain, low noise and very linear. Similar to a pentode but quieter,and no screen current.
  
  Regards, Allen (Vacuum State)

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