The Red Light District - another PP EL84 amp - Page 9

SY · 17th June 2006, 08:09 PM

Poobah, that's exactly right.

Crowhurst discusses this in detail in his book "Understanding Hifi Circuits." It may be easier to find his shorter treatment in the article, "Puzzled About Amplifiers?" from Audio in 1959.

poobah · 17th June 2006, 08:20 PM

Thanks SY... I'll dig around.

lndm · 18th June 2006, 09:57 AM

This wouldn't be it??? http://www.diyaudio.com/forums/showt...943#post941943

SY · 18th June 2006, 12:51 PM

No, that's not the one, but I goofed and the article I cited wasn't, either; it was more relevant to the anti-blocking measures that I took.

The book citation is correct, however. And it's a book that anyone serious about tubes should own.

lndm · 18th June 2006, 12:56 PM

I don't mean to get off track, but Pete Millett has some new scans, including some by Crowhurst.

SY · 28th June 2006, 02:30 AM

The complete article on this amp has now appeared in Bas Horneman's diy magazine:

http://basaudio.net/diymag.htm

anatech · 28th June 2006, 02:58 AM

Hi SY,
Your MJE340 is looking the wrong way in the HV regulator diagram.

It's a well written article. Still reading.

-Chris

SY · 28th June 2006, 03:16 AM

That's curious because there's no MJ340 in the reg! And the TIP50 is pointing the right way.

Andrewbee · 28th June 2006, 06:27 PM

Just read the article Sy. Great writing!
With your writing style I imagine I could understand just about anything, even how the female mind works (or does'nt).
Thanks very much.

Andrew

Giaime · 28th June 2006, 06:41 PM

I read the article too Stuart.

Aside from the usual compliments for the great work, I would like to know more about the issue of overload recovery.

A simple question for now: what do you think of driving a power tube (not extreme ones) in a PP with a cathode follower, dc coupled? Are there really advantages in DC coupling (assuming that I don't need necessary A2 drive)?

And if I drive power tubes with a cathode follower, would be cathode bias an option or would you consider only fixed bias? Leds are not applicable here because I would need an insane amount of them

Thank you very much.

17th June 2006, 08:09 PM	#81
SY diyAudio Moderator Join Date: Oct 2002 Location: Austin, TX Blog Entries: 1	Poobah, that's exactly right. Crowhurst discusses this in detail in his book "Understanding Hifi Circuits." It may be easier to find his shorter treatment in the article, "Puzzled About Amplifiers?" from Audio in 1959. __________________ "...we stumble and get up, we are sad, confident, insecure, feel loneliness and joy and love. There is nothing more; but I want nothing more.” - Christopher Hitchens 1949-2011

18th June 2006, 12:51 PM	#84
SY diyAudio Moderator Join Date: Oct 2002 Location: Austin, TX Blog Entries: 1	No, that's not the one, but I goofed and the article I cited wasn't, either; it was more relevant to the anti-blocking measures that I took. The book citation is correct, however. And it's a book that anyone serious about tubes should own. __________________ "...we stumble and get up, we are sad, confident, insecure, feel loneliness and joy and love. There is nothing more; but I want nothing more.” - Christopher Hitchens 1949-2011

28th June 2006, 02:30 AM	#86
SY diyAudio Moderator Join Date: Oct 2002 Location: Austin, TX Blog Entries: 1	The complete article on this amp has now appeared in Bas Horneman's diy magazine: http://basaudio.net/diymag.htm __________________ "...we stumble and get up, we are sad, confident, insecure, feel loneliness and joy and love. There is nothing more; but I want nothing more.” - Christopher Hitchens 1949-2011

28th June 2006, 03:16 AM	#88
SY diyAudio Moderator Join Date: Oct 2002 Location: Austin, TX Blog Entries: 1	That's curious because there's no MJ340 in the reg! And the TIP50 is pointing the right way. __________________ "...we stumble and get up, we are sad, confident, insecure, feel loneliness and joy and love. There is nothing more; but I want nothing more.” - Christopher Hitchens 1949-2011

28th June 2006, 06:27 PM	#89
Andrewbee diyAudio Member Join Date: Apr 2002 Location: Cayman Islands	Just read the article Sy. Great writing! With your writing style I imagine I could understand just about anything, even how the female mind works (or does'nt). Thanks very much. Andrew __________________ None of us are leaving this world alive. Enjoy it responsibly as you may.

17th June 2006, 08:20 PM	#82
poobah diyAudio Member Join Date: Nov 2005	Thanks SY... I'll dig around.

18th June 2006, 09:57 AM	#83
lndm diyAudio Member Join Date: Mar 2006 Location: nsw	This wouldn't be it??? http://www.diyaudio.com/forums/showt...943#post941943

18th June 2006, 12:56 PM	#85
lndm diyAudio Member Join Date: Mar 2006 Location: nsw	I don't mean to get off track, but Pete Millett has some new scans, including some by Crowhurst.

28th June 2006, 02:58 AM	#87
anatech diyAudio Moderator Join Date: Jun 2004 Location: Georgetown, On	Hi SY, Your MJE340 is looking the wrong way in the HV regulator diagram. It's a well written article. Still reading. -Chris

28th June 2006, 06:41 PM	#90
Giaime diyAudio Member Join Date: Oct 2004	I read the article too Stuart. Aside from the usual compliments for the great work, I would like to know more about the issue of overload recovery. A simple question for now: what do you think of driving a power tube (not extreme ones) in a PP with a cathode follower, dc coupled? Are there really advantages in DC coupling (assuming that I don't need necessary A2 drive)? And if I drive power tubes with a cathode follower, would be cathode bias an option or would you consider only fixed bias? Leds are not applicable here because I would need an insane amount of them Thank you very much.

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