Well, the 2L is not a warm sound, IMO (neutral is more like it). Because of this I would guess that this is the type of sound that you prefer from your preamp. If you go to the FAQ section @ audioasylum.com and research your "Amperex" tubes under Joe's Tube Lore you may be able to verify and/or identify them. Amperex 6922 types are not generally shy in the bass region, though new ones do require anywhere from 25-60 hours of playing time for the bass to kick in. Other than bogus Amperex's the namesake has been owned by Richardson Electronics for years and they can re-brand any tube that they like as Amperex, perhaps this is what you purchased?
There are also many different Sovtek 6922's. I received a pair of 1970's versions (boxes marked Upscale Audio) with a used preamp that I purchased and they have an entirely different sound than later production (early 90's on) Sovteks. I also have some 80's Relector 6H23-EB's from ATSI tube that I feel are much better than the later productions.
I myself prefer Amperex/Philips/Mullard types and and am not a Telfunken fan though I have never used their CCA's. As far as Siemens go I find the two Russian varieties mentioned above to be competative sound wise for a lot less money (Siemens are dryer and less warm than Amperex and the like).
Keep in mind that any new tube needs to burned in for X amount of hours and that any tube (new or used) that has been shipped through the mail will sound odd for the first 24-48 hours (regardless of burn in) due to some sort of charge or static that is picked up during transit).
There are also many different Sovtek 6922's. I received a pair of 1970's versions (boxes marked Upscale Audio) with a used preamp that I purchased and they have an entirely different sound than later production (early 90's on) Sovteks. I also have some 80's Relector 6H23-EB's from ATSI tube that I feel are much better than the later productions.
I myself prefer Amperex/Philips/Mullard types and and am not a Telfunken fan though I have never used their CCA's. As far as Siemens go I find the two Russian varieties mentioned above to be competative sound wise for a lot less money (Siemens are dryer and less warm than Amperex and the like).
Keep in mind that any new tube needs to burned in for X amount of hours and that any tube (new or used) that has been shipped through the mail will sound odd for the first 24-48 hours (regardless of burn in) due to some sort of charge or static that is picked up during transit).