12ax7 vs 5751


hi all,
i need some advice. i`m very new to tube amplifiers and i`ve been doing some tube rolling.

i currently have a pair of grant fidelity matched psvane 12ax7t`s in my amp which sound fantastic.

what i`d like to know is which are the better tubes, 12ax7`s or 5751 tubes. i`ve been looking at forums and there are folk out there that say 5751 tubes are better than 12ax7 tubes.

can i have your thoughts on this please and also which are the good 5751`s to go for.

i really like the psvanes but if they can be bettered i`d go for it as my next line up of replacement tubes.

my amp is a yaqin mc100b. the tubes i have installed at the moment are.....
2 x psvane 12ax7t`s
2 x brimar 6sn7gty/cv1988`s
2 x sylvania 6sn7gtb`s
4 x electro harmonix kt88eh`s

many thanks in advance guys.
grayf
Thanks for the info GrayF. If you decide to sell the Sylvania give me a shout out. Best!
i just hope i have enough funds in the bank to get them! but yes i`ll certainly let you know if i decide to part with them if they`re not suited in my system. it`s going to be a thrilling time once the treasures have broken in. 242 hours to go!!! and counting! how sad am i!!!
Grayf
Glad you liked them. Both of those cds are good beginning to end which is rare...at least for me!
Grayf,

As you can obviously tell from all of my posts, I have found it very difficult to get past the Telefunkens too.

JBS
Grayf,
I have a hunch that given your current delight with the Tele 12AX7s that you might really like the Raytheon windmill getter 5751s. Since those are very rare and costly, you can almost approximate them with Raytheon mid 60s 2 mica regular getter BPs. They have a red painted label and some are yellow label. I was fortunate to aquire some WNDMills a while back and have some of the 2 mica non WNDMills as well. They have the strong presence you seem to prefer with excellent articulation but have a noteable increase in soundstage IME.
No I am not selling. BTW allways snatch up Sylvania TMBPs when avail at a low price- some might be only "OK" but you eventually hit on some good ones and then you are in for a treat. I can give you a little tube hunting hint. In the long run it is worth buying singles at a very reduced prices and collecting enough to match or approximate pairs. I was able to put together several different tube sets this way I couldn't find in pairs at least not at a price I could pay. Good Luck