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Old 21st August 2009, 09:28 PM   #1
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Default PCF801 Suggestions

Hi,
I have a bunch of PCF801 (combined pentode/triode w. common cathode) lying around and would like to build my first tube preamp with them.
Thought about a buffer+grounded grid circuit with heavy negative feedback.
Should I use the triode connected pentode as buffer or the triode?
The frame grid triode may be less affected by low anode voltages, so it may better be used as the grounded grid part.
I want as much open loop gain and less open loop distortion as possible.
Any suggestions?

AND would it work at all?
simplified schematic attached....
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Old 21st August 2009, 09:47 PM   #2
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You could get some inspiration here:
http://webpages.charter.net/dawill/t...Compound2.html
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Old 28th August 2009, 09:19 PM   #3
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thank you, I already hate this tube...connected cathode...grrrr
Regards
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Old 29th August 2009, 06:55 AM   #4
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Looks like that guy in the link is thinking in the same direction as you are with the GG configuration.

Just try it... you would have something unique...!
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Old 8th September 2009, 02:50 PM   #5
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It is great if you build it with Mu stage schem. Easy to drive the next power tube.
Try it so you will happy on it.
Good luck.
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Old 8th September 2009, 08:41 PM   #6
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Default anti-triode, anyone?

swinging around a CCS tail, triode input side, pentode as anti-triode in a p-p VERY low output amp or a headphone amp?
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Last edited by aardvarkash10; 8th September 2009 at 08:54 PM.
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Old 9th September 2009, 12:33 AM   #7
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Here's a good starting point for ya. I based it on the standard operating points from the datasheet so it should work out fairly close.
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