Top resistors

@Sherod- If the NOS Sylvanias are the bottom-gettered, VT-231 type(from the 40's); they are already excellent tubes. Very natural and transparent, like the Tung-Sols. The biggest noticeable difference, would be in the sound stage depth. That would be highly dependent on how well the rest of your system performs. Regarding the price: everyone has different takes on what's important and valuations, regarding presentation. If the Sylvanias aren't the above mentioned, get a pair of those(or bottom-gettered Ken-Rad VT-231s) to compare with the ones supplied. They aren't as salty as the Tung-Sols and may satisfy any desire to further roll your tubes. Hope the OP doesn't mind us hijacking the thread!

@ Sherod- The site wouldn't let me add this info: (http://www.ebay.com/sch/i.html?_trksid=p2055119.m570.l1313.TR0.TRC0.H0.Xsylvania+vt231+vt-231&_nkw=sylvania+vt231+vt-231&_sacat=0&_from=R40) or(http://www.ebay.com/sch/i.html?_odkw=sylvania+vt231+vt-231&_osacat=0&_from=R40&_trksid=p2045573.m570.l1313.TR0.TRC0.H0.XKen-Rad++vt231+vt-231&_nkw=Ken-Rad++vt231+vt-231&_sacat=0)

Thanks Rodman99999,
I haven't yet received the preamp, but as soon as I find what style of NOS Sylvania 6sn7 they use, I will be able to compare.

As for the TF020. The leads can be soldered out and replaced with some nice wire for a much improved sound.

Aa very nice balanced resistor, but felt the TX2575 to have a more incisive hifish character which can be too much of a good thing. I balanceda TX2575 with nichicon caps for my cdp output. It was perfectly balanced.

Now, with the TX2575 with rubycon zl, the sound became bright, hard and super etched. Here where the TF020 can sound nice with with the zl caps.

I have bad experience with zl caps...sounds harsh -- horrible for me
I more prefer using TX2575 with better caps such as Elna cerafine or silmic or with blackgate