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A Matter of Class...

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AB8IF

Post subject: A Matter of Class...

Posted: Sun Jul 31, 2011 3:14 pm

Joined: Wed Oct 20, 2010 2:58 pm
Posts: 213
Location: Ohio

I'm looking for recommendations of amplifier class for a 6AG7 RF pentode. It will drive a 40m class C 807 final running at 350v / 100mA. Input to the 6AG7 comes from a VFO-Buffer that can output up to 15 volts peak-to-peak. I have budgeted 10mA at 255v for the 6AG7 plate. Should I bias the the 6AG7 for Class A, B, or C operation?

Thanks.
Roger

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XtalHWJ

Post subject:

Posted: Sun Jul 31, 2011 6:09 pm

Joined: Thu Mar 12, 2009 4:09 pm
Posts: 918
Location: Sonoma County, CA

Didn't know there was a choice?

Class C.

Rich
Viking Adventurer Transmitter from the 1950s.

http://www.boberdmann.com/w7tqj/Adventurer/OEM_Schematic.jpg

_________________
Homebrew Radio ex-Silicon Valley

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AB8IF

Post subject:

Posted: Tue Aug 02, 2011 1:12 am

Joined: Wed Oct 20, 2010 2:58 pm
Posts: 213
Location: Ohio

Hi Rich,

I think you have the right answer...

I don't need the power gain of Class A. There's plenty of input drive available to the 6AG7. But I'm limited on the power available to the 6AG7 plate. So plate efficiency is the driver... so to speak... (i.e. Class C is the way to go).

73, AB8IF

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