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Old 16th November 2012, 02:45 AM   #1
scott17 is offline scott17
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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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Old 16th November 2012, 04:45 AM   #2
astouffer is offline astouffer  United States
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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.
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Old 16th November 2012, 05:34 AM   #3
dgta is offline dgta  United States
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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.
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Old 16th November 2012, 10:36 AM   #4
DF96 is offline DF96  England
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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.
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Old 16th November 2012, 11:39 AM   #5
gokite is offline gokite
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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.
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Old 16th November 2012, 12:03 PM   #6
scott17 is offline scott17
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Quote:
Originally Posted by gokite View Post
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.
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Old 16th November 2012, 12:56 PM   #7
TheGimp is offline TheGimp  United States
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An EL3N, with very few exceptions, is not a KT88. I can't see swapping it with an EL156 either.
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