Sirius & FM

[sled108]

Alright, here's one for you guys...Why is it that while burning-in and biasing a new quad of JJ KT77s I listened to my best FM and CDs, but found their sound not as I expected....Bass shy and a little too much treble...I was saving my Vinyl till I was sure things were 'Right'. That is until I tuned in my Sirius on the FM, and Wow, Way better...Normally, through the Clarion's output jack the sound is light, to say the least....But tuned in on my Pioneer TX-9100 it sounds better than my best local FM station or CD. Fuller, more balanced, much nicer Bass and Head turning Mids..better than a straight Aux. input connection too.
Why is this so?

[leadbelly]

How about telling us non-psychics what your amp is?

[sled108]

Sorry.....But you still need to be a Psychic... It's a True One of a Kind... A ST70 with KT77's, 6U10's and no rectifier tube...See Pic..

[leadbelly]

Well then give us a schematic if you want meaningful replies. Don't mean to be rude but isn't this common sense?

[sled108]

I did'nt build it...I've had it for at least 25 yrs. and have seen none like it...Here's the insides....
Have you seen anything like it? I would really like to know something about it, because as it is I'm on my own with it...But it does sound Marvelous...

[leadbelly]

Well, I'd be willing to believe your Sirius beats FM, even though popular opinion is to the contrary. However, Sirius beating a quality CDP seems far fetched to me. I'd suspect a technical problem like impedance mismatch before accepting that.

[sled108]

But why would the Sirius FM sound so much more full bodied and dynamic than full signal local FM? I thought that the Tubes were running low bias until I tuned in the Sat. Radio...Now I'm starting to wonder about what to use as a reference source....Maybe it's time for the Vinyl..

[mashaffer]

Well if you are running the sirius "on FM" then I suspect that the FM modulator is messing with the frequency response.

mike