PCF801 - pentode section has remote or sharp cut-off?

ilimzn · 31st January 2006, 05:04 PM

I know this ube is of limited use to begin with, being a triode-pentode with common cathode, but the documentation i have remains unclear wether the pentode section is remote or sharp cut-off. Can anyone help?

Tom Bavis · 31st January 2006, 05:15 PM

Sharp cutoff. See also 6GJ7, 8GJ7. And of course Fred's paraphase circuit... http://www.dogstar.dantimax.dk/tubestuf/paraph.htm

wa2ise · 31st January 2006, 05:15 PM

Taking a look at Frank's website, http://www.mif.pg.gda.pl/homepages/f...0/p/PCF801.pdf
the pentode curves look to be somewhat remote cutoff. Also at frank's, http://www.mif.pg.gda.pl/homepages/f...4/p/PCF801.pdf it says that it's a remote cutoff pentode.

Unless you want to use it for guitar work, it's probably not usable for audio.

ilimzn · 31st January 2006, 07:39 PM

Thanks, you are rightm the mazda datasheet in French says it's a remote cut-off. Well, I suppose I should find a radio uy that can use the dozen or so NOS I have here along with the EF183 and EF85...

31st January 2006, 05:04 PM	#1
ilimzn diyAudio Member Join Date: Feb 2005 Location: Zagreb	PCF801 - pentode section has remote or sharp cut-off? I know this ube is of limited use to begin with, being a triode-pentode with common cathode, but the documentation i have remains unclear wether the pentode section is remote or sharp cut-off. Can anyone help?

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31st January 2006, 05:15 PM	#2
Tom Bavis diyAudio Member Join Date: Jun 2002 Location: Macedon NY	Sharp cutoff. See also 6GJ7, 8GJ7. And of course Fred's paraphase circuit... http://www.dogstar.dantimax.dk/tubestuf/paraph.htm

31st January 2006, 05:15 PM	#3
wa2ise diyAudio Member Join Date: Apr 2005 Location: NJ	Taking a look at Frank's website, http://www.mif.pg.gda.pl/homepages/f...0/p/PCF801.pdf the pentode curves look to be somewhat remote cutoff. Also at frank's, http://www.mif.pg.gda.pl/homepages/f...4/p/PCF801.pdf it says that it's a remote cutoff pentode. Unless you want to use it for guitar work, it's probably not usable for audio.

31st January 2006, 07:39 PM	#4
ilimzn diyAudio Member Join Date: Feb 2005 Location: Zagreb	Thanks, you are rightm the mazda datasheet in French says it's a remote cut-off. Well, I suppose I should find a radio uy that can use the dozen or so NOS I have here along with the EF183 and EF85...

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