4 ohm or 8 ohm tap on old tube amps?

I tried the different outlet taps on my tube amps with the speakers I was going to use and simply listened for the sound I liked best. It has worked out very well in a couple of different, amp/speaker combinations, without damage to amp or speaker. My advice use the tap that sounds the best

I agree with Mechans here...Using a 4 ohm tap won't hurt anything with 8 ohm speakers...I have usually found 8 ohm taps work best, even with 4 ohm speakers...but your milage will very much vary on this...just try it..

I find in general the higher the impedance tap used the better the sound. As Mechans says just try both taps, your opinion may differ.Trust what you hear.
Regards,

You can decide which tap you like better based on person taste, but you should also listen for which tap gives better power transfer. One tap should sound more powerful and that is the tap that matches best with your speakers.