Preamp Deal of the Century

Hello all , I have a Cortese 3-4 years old and need a pair of tungsol pearl 12B4A cryo-vac tubes. Anyone know where I can get a pair ?
Does this tube have a large impact on the sound ?
Is there a better or more common tube to get ?

Thank you for the help

Abill

I get some microphonics if I tap on the chasis but this settles down quickly and certainly does not intrude on the music.My speakers are 98db sensitivity so show up problems like this.I used to have a Lux power amp that had bad microphonics.I sold this and later discovered my power supply was running up to 266 volts when it was meant to be 240 volts-this may have been a cause.It might pay to get your power supply checked.I had mine lowered at the transformer.Also stevem60 has a type of 300b which he reckons has very low microphonics.I'll ask him to post info on this.
What 300b valves do you find sound best in the Cabernet?I have tried the TJ meshplate which sounds nice tonally but I think the EH has much more precise imaging and tighter bass.I remember comparing the EH and the Western Electric and I prefered the EH!.
Does tube rolling just involve dunking the tubes in liquid nitrogen or does it have to be done when the moon is right and with the tube in a special cow horn- bio dynamic style?I have access to liquid nitrogen.

JT

I have a pair, cyoyed even, brand new. Shoot me an e mail with your info and you can have them. I moved up to the Cabernet, so I don't have any need for them

my response was to abill about the 12b4a's he needed

JT,

My power supply is okay. I like the sound of the PX4 tubes more than 300B so I did not do any 300B tube rolling even though Cabernet has this option. I tried TJ 300B once but the bass was too much for my ears and switched back PX4 tubes.

Kenji