Question about different tubes


I have a BAT VK30 tube preamp and a VK200 SS amp. The preamp has 6-6922 tubes and presently has upgraded tubes from upscale audio that say -Russian mill gray plate. The original tubes from BAT were Sovtek 6922's. I am driving a pair of Martin Logan SL3's, and the midrange is a little lacking.

My previous gear was Parasound, and the SL3's were so bright it could make your ears bleed!! From prior recommendations on Audiogon, I picked up the BAT equipment and the SL3's are so warm, its unbelievable. The midrange now however, is a pushed back or a little lacking, if you can understand what I'm explaining.

My question is: will a tube change to the original Sovteks or another tube improve my situation? or are there any other recommendations.

I am using a Nordost red dawn xlr between the amp & pre. Speaker cables are Innersound, coaxial biwire which consists of 2 separate runs to each speaker.

I was also wondering if the BAT amp rated at 100wpc @ 8 ohms / 200 wpc @ 4 ohms, and capable of driving to 1 ohm, is enough power for the 4 ohm Martin Logans. Before, I had two Parasound amps in a horizontal biwire doing 400 wpc.

sfrounds

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I really appreciate your help with this. I wish I could get my preamp to sound the way I'd like it to. I'd like to try the tubes you recommended but after a conversation last night and a small test at home, I'm having second thoughts.

I hope someone can comment on what I was told, by a reputable someone last night. Please let him be wrong. He told me "tube gear cannot produce sound as good as solid state gear - period!" He says, its electronically impossible for tubes to produce music in its fullest. Further, he says the warmth people describe is from the lack of what is supposed to be there and is not.

After talking with him, I took a good but inexpensive SS pre and hooked it up to my BAT amp. The sound was definately much bigger and really forward. Things that were kind of hidden because of my tube pre, now, were right out there.

So again, I'm not feeling well. Just bought the BAT amp and pre. The amp however solved a bigger problem that I had with excessive brightness, but didn't realized that the tube pre was going to bring me to the opposite extreme. I am considering selling the pre and picking up a SS pre. I dont however want to, but are a little skeptical on spending more money for new tubes when this guy says it will basically always be lacking something. HELP!
I just called Upscale audio to see if I could get a set of the Amperex 6dj8 bugle boys, and they told me they only sell them with new equipment sales. Anywhere else I can get them?....Steve