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scott17 16th November 2012 02:45 AM

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

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 (Post 3243720)
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.


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