Need tube 101 info


Ok I'm new to this tube preamp world and I'd like to know a few things. I've acquired a BAT Vk-3ix that needs new tubes but I'm not sure I understand what tubes do what and how to properly "roll" them. I don't want "bright" tubes but I'm completely at a loss as to which brands I should be looking at.

Also what do the two tall inboard tubes do, and what do the small pairs to the left and right do?

When you get a matched pair of the small tubes does one go on the left and one go on the right?

Can you mix brands on the left and right. For example can you have brand x and y on the left and x and y on the right? Will that hurt anything? Or should all be the same brand?

I know these may be simple questions but I gotta start somewhere I suppose.
last_lemming
As your current tubes are not up to snuff purchase a complete retube kit for $90 online (thetubestore) in order that you will have a basis for comparison once you start experimenting with more exotic tubes.
Thank you for your time and information. I have been to tubestore.com and tubedepot.com. I did a lot of reading and ordered the OEM package of Electro-harmonix - evidently the Sovtek's are not made anymore. This set will be my "base" from which to compare others with. I am also looking for a matched pair of Mullards to replace the bad one currently in the pre amp.

As for the left/right issue, I didn't mean one brand on the left and one brand on the right, I meant one of each on the left and one of each on the right.

Sorry if that was confusing.
Hi Last Lemming.

I would also recommend familiarizing your self with which tubes do what. In a tube amp, certain parts of the tube layout will alter the sound of the amp more than others.
Rosco,

That is one of my questions in my original post. I would like to know what and why on my specific piece.
Last_lemming...with regards to your last question, I would recommend calling BAT's customer service/technical support folks to walk you through what the difeerent tubes do and if they have recommendations on which sets impact the sound more than others. Also ask them if they have recommendations for certain NOS tubes in each of the slots. You will likely get an explanation of the first question for sure (what the tubes in different slots do and which to tube roll first for bigger impact on sound) and less likely to get specific recommendations on what NOS tubes to try out (although you never know).

The other respected source you will find often talked about on Agon when it comes to tube rolling (although somewhat controversial) is Upscale Audio. They carry BAT and the owner will have strong opinions about what tubes to roll. He sells NOS and current production tubes and he may be another good source to talk to. Good luck.