Single Ended Amp

scott17 · 16th November 2012, 02:45 AM

Is this a mistake? Equating the EC88CC with the 6N1P as a driver? What type of feedback is that from the OT primary side, 33K/100uF through 47K, from the low side of the OT to the plate of driver?

KT88 Tube Power Amplifier Class A

astouffer · 16th November 2012, 04:45 AM

Can't speak for the EC88CC and 6N1P (people claim they are similar) but that is not feedback from the transformer. Its a low pass filter. Pretty much all amplifiers use it.

dgta · 16th November 2012, 05:34 AM

That schematic also calls for 6DT8 besides the other 2 you mentioned. 6DT8 is nothing like E88CC, not even close. I would take anything they say with a large grain of salt and verify with other sources.

DF96 · 16th November 2012, 10:36 AM

That whole web page is a mistake. Audiophile myths repeated using poor English, and a circuit which is little better than a high power version of a 1950's radio set audio stage.

gokite · 16th November 2012, 11:39 AM

Its a low pass filter. Pretty much all amplifiers use it.

It passes all frequencies above 0.05Hz.

It's also a smoothing filter for the driver plate for the B+ Supply.

I would think aside from other issues, the 100 electro from the OT to cathode ground would be better if terminated at the cathode rather than ground.

scott17 · 16th November 2012, 12:03 PM

Quote:

Originally Posted by gokite

Its a low pass filter. Pretty much all amplifiers use it.

It passes all frequencies above 0.05Hz.

It's also a smoothing filter for the driver plate for the B+ Supply.

I would think aside from other issues, the 100 electro from the OT to cathode ground would be better if terminated at the cathode rather than ground.

Yeah, I can see that now, I was looking at it wrong by the way it's drawn. Thanks.

TheGimp · 16th November 2012, 12:56 PM

An EL3N, with very few exceptions, is not a KT88. I can't see swapping it with an EL156 either.

16th November 2012, 02:45 AM	#1
scott17 diyAudio Member Join Date: Aug 2009 Location: JFK	Single Ended Amp Is this a mistake? Equating the EC88CC with the 6N1P as a driver? What type of feedback is that from the OT primary side, 33K/100uF through 47K, from the low side of the OT to the plate of driver? KT88 Tube Power Amplifier Class A

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16th November 2012, 04:45 AM	#2
astouffer diyAudio Member Join Date: Jun 2004 Location: Pittsburgh, crumbling wasteland	Can't speak for the EC88CC and 6N1P (people claim they are similar) but that is not feedback from the transformer. Its a low pass filter. Pretty much all amplifiers use it.

16th November 2012, 05:34 AM	#3
dgta diyAudio Member Join Date: May 2011	That schematic also calls for 6DT8 besides the other 2 you mentioned. 6DT8 is nothing like E88CC, not even close. I would take anything they say with a large grain of salt and verify with other sources.

16th November 2012, 10:36 AM	#4
DF96 diyAudio Member Join Date: May 2007	That whole web page is a mistake. Audiophile myths repeated using poor English, and a circuit which is little better than a high power version of a 1950's radio set audio stage.

16th November 2012, 11:39 AM	#5
gokite diyAudio Member Join Date: Oct 2011	Its a low pass filter. Pretty much all amplifiers use it. It passes all frequencies above 0.05Hz. It's also a smoothing filter for the driver plate for the B+ Supply. I would think aside from other issues, the 100 electro from the OT to cathode ground would be better if terminated at the cathode rather than ground.

16th November 2012, 12:56 PM	#7
TheGimp diyAudio Member Join Date: Aug 2009 Location: Johnson City, TN	An EL3N, with very few exceptions, is not a KT88. I can't see swapping it with an EL156 either.