tone differences with different primary Z ???

[HTH]

Just wondering what tone/feel differences you all notice with various primary Z's.

I've got a Mercury Magnetics O45-RS OT in an AC30 and it has taps for 6K6, 8k and 9k.

AC30s have a typical primary Z of 4k (afaik), so 6K6 will be fatter and more compressed right? 8k and 9k will be even more of that same tone, right?

[Bruce / Mission Amps]

Just wondering what tone/feel differences you all notice with various primary Z's.

I've got a Mercury Magnetics O45-RS OT in an AC30 and it has taps for 6K6, 8k and 9k.

AC30s have a typical primary Z of 4k (afaik), so 6K6 will be fatter and more compressed right? 8k and 9k will be even more of that same tone, right?

Why ask?... just do it and answer this yourself.
You might be surprised at what YOU can hear rather then listen to what others, with little to no real world experience, say, "think" or "expect" they or you should hear, .... especially when their opinion is based on regurgitating countless previous opinions of others who also had or have very little real world experiences!

[mikeboone]

I agree... Expected outcome from theory and sonic performance are not always a 1:1 deal in the tube world.

If you have the means, you should record each configuration with all things being equal on your amp settings. This way you can go back and listen objectively. My ears tend to get fatigued after a few hours of tinkering and testing.

If you just simply record the same passage over and over you will get a better sense of the subtle differences at a later time.

[BJosephs]

I have a similar question about primary impedance. Mercury Magnetics specced a replacement OT that is double the impedance I would have expected (9K as opposed to 5K for a SE EL84).

My concern is really safety for the amp. Would this obligate re-biasing or does the Impedance of a winding have little effect of Direct Current?

[tubeswell]

I have a similar question about primary impedance. Mercury Magnetics specced a replacement OT that is double the impedance I would have expected (9K as opposed to 5K for a SE EL84).

That sounds like a primary load resistance for a Single-Ended 6V6GT (i.e. 8k2)

[Old Tele man]

...Zpri affects tube/OT frequency response and roll-off