cathode bypass on opt secondary

[alexg]

I came across a schematic of an EL84 SE, the cathode bypass is connected to the 8 ohm tap of the OPT secondary.

Haven't encountered this before, so, why is it connected to the 8 ohm tap of the OPT's secondary?

Thanks.

 

[e_fortier]

Hi,

It's called cathode feedback, just like in the attache file.

Basically it reduces distortion greatly, increases damping factor (tighter bass) but needs more input voltage ( just because it's feedback).

I did this on my RH807 and it plays very good.

Rgds,
Eric

 

[alexg]

Hi,

It's called cathode feedback, just like in the attache file.

Basically it reduces distortion greatly, increases damping factor (tighter bass) but needs more input voltage ( just because it's feedback).

I did this on my RH807 and it plays very good.

Rgds,
Eric

Eric,

Thanks.

BTW, the schematic you posted is the one I was looking at!

 

[dsavitsk]

Tubelab does this on the Simple SE Simple SE schematic

I tried it on a pentode headphone amp, and was not happy with the sound: ecp.cc

 

[the_manta]

My 1625 amp works this way.

An externally hosted image should be here but it was not working when we last tested it.

A member here gave me a good hint to connect it like in your schematic which doesn't have DC on the speakers (but it is a very small amount, about 10mV). I like the sound.