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Lack of Bass from my BAT VK-5i Preamp...

I'm running BAT VK-5i tube preamp with Jeff Rowland Model 5 SS amp with really good result but kind of thin in lower frequencies. Here is my comparison in my system between using BAT Tube preamp and EAD Signature SS Preamp with my JR 5 amp to feed B&W 802S3.

With BAT VK-5i Tube: Music is more refined with no grain. Image and soundstage are really excellent. You can spot each of instruments in the band in exact location. More than that, Highs are so sweet and Mids are full and rich. By the way, it lacks the excitement from bass in lower frequencies. I'm in process of getting new Amperex/Tungsol tubes to replace Sovtek tubes. I hope this upgrade would bring some improvements in lower frequencies.

With EAD Signature SS: More excitement from transient attacks than the BAT but image and sound stage are not as good.

Is it a typicall characteristic of tube gears. Or anyone have compared BAT VK-5i with other SS preamps, please give me your result.
ted263
marakanetz's avatar
marakanetz
5,473 posts
 
One of my friends once bought BAT VK-60 amp with VTL preamp(do not remember a precise model) No matter of impedance values on both ends which were good enough to match, he had the same problem as you do. He was advised to go onto BAT completely meaning having BAT source, preamp etc...
He did buy BAT VK5i and CD-player and than phono and he isn't complaining. He said to me that once you buy a single component of BAT, you'll have to eventually get a BAT complete system meaning that BAT can work with BAT. Does maybe anyone know if there is any problem with connecting BAT with non-BAT components? If you're about to answer than find my thread on amps-preamps forums to share some thoughts.
abecollins
219 posts
 
Might be just a characteristic of tubes to some extent. I have experimented with the following tube vs ss preamps and my results were similar to yours.

Adcom GFP-750 SS Preamp
CJ PV-14L tube preamp
CJ PV-12 tube preamp
Audio Research LS16 tube preamp

Other gear: CJ Premier 11a tube amp. Thiel CS 1.5 speakers. Cary 306/200 CD player.

Adcom: Had the the best frequency range with low, tight, and fast bass and higher treble extension than any of the tube preamps I've compared. Not quite the air, soundstage, or transparency of the tube preamps.

CJ PV-14L: The sweetest sounding of the preamps listed here but seemed to roll off the lows and highs a bit more than I liked in my system. Might be a nice match for a somewhat dry or sterile sounding system.

CJ PV-12: Similar to PV-14L above.

A.R. LS16: Broader frequency response vs CJ, a bit better bass with punch, faster transients, better treble. Not as sweet as CJ. Doesn't sound as "tubie" as CJ. Not quite the low end punch or high frequency extension as the Adcom GFP-750 but still retains some of that tube magic missing in the Adcom.

I mostly use my A.R. LS16 but still own the Adcom GFP-750. For me in my system, A.R. LS16 has the best sound. Best value would go to Adcom GFP-750.
tubeguy4599a9
15 posts
 
Set the Amps input impedance to 20k ohms.
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