Single Ended Amp

[scott17]

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]

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]

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]

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]

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]

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]

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