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RE: differential phase splitter for the PP power ampilifier

59.152.202.231

In Reply to: RE: differential phase splitter for the PP power ampilifier posted by Allen Wright on September 16, 2009 at 05:25:46

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

Follow Ups:

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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