4 or 8 ohm connection for a 6 ohm speaker?

Bill: 80% of the sound of a conventional tube amp is the quality and configuration of the output transformer... in essence you switched transformers and in essence amplifier so a change in sound makes sense.

I suspect you will like the 8 Ohms more. 

Pay particular attention to the brightness/harshness and detail in the mid to treble region vs. bass.

Tomic601, that makes sense to me as well...thank you. So glad I made the change to the 4 ohm taps today on everyone's recommendation because all around I now have a very pleasing sound output with a boost in the bass and a less hot high end. 

Next change will be the input stage on both mono blocks. 

Bill from Nova Scotia

Eric_Squires...the 4 ohm taps worked best for my setup. 

OP:

Glad you experimented!! :)

Best,

E