tube upgrade for first sound


Has anyone been able to improve on the stock tubes in the First Sound preamps? I was thinking about trying the Russian 6H23. Any thoughts? thanks
84audio
Thanks men. This really does feel like being a member of a club.
:-) It's funny how something like audio gear can bring people from all around the country together.

I'll be patient and I'll keep you posted. BTW - I already picked up a Mini Khan power cord for after break in! :-)

Be well guys.

Paul
>I already picked up a Mini Khan power cord for after break in! :-)

And you thought tubes were expensive!
Question....According to Emmanual, (and the owners manual) the break in period for an FS is 2 weeks. But alot of you fellow FS owners advise a month, before Tube and power cord experimentation. Any reason for this?

BTW - Yes the power cord was expensive. If it doesn't make a difference in my system....it will be up for sale. :-)

Thanks guys

paul
Give it a month so that you really get to know the sound of the broken in unit before you start experimenting.
Ok Fellas....What are the signs of a tube going bad? I am getting a distortion in the upper frequencies in the right channel of my new FS Pres. Deluxe MkII. It has happened within th past two days. Certain High pitches (piano music, flute/piccolo) Cause a slight fuzziness in the sound. It also sometimes sounds as though, a single note is seperating into 2 pitches.
I've ruled out the speakers - swapped them and it still does it. Ruled out the source - 2 different scources do the same thing. When I play my HT preamp (Lexicon MC8) on the same music, the distortion goes away. :-(
Besides a tube, going bad, I don't know what else it could be.
Do any of you fellow FS owners have any Ideas?
Any thoughts would be appreciated.

thanks

Paul