is our ultra high-end model of UPRE (Universal pre-amplifier) series,
which consists of a total of 8 tubes to make this superior performance
pre-amplifier. The total tube rolling combinations have more than
1,000,000 possibilities. The first row of tubes
use both 12AU7/12AX7/12AT7/ECC81/ECC82/ECC83/5751/5814A or
equivalent + 6SL7/6SN7/6SU7/ECC32/ECC33/ECC35 as the front end amplification
stage. This section contributes about 40 % of the tonal quality.
The 2nd stage also
uses a similar set of tubes which can be used in the 1st stage. This
section contributes around 30% of the overall tonal quality.
The tube rectifier
can use a standard 5U4G or any equivalent tube.
There are 6 different
ways to play around with the tube placement, you can omit some tubes
in a certain section and the unit can still work without problem.
This move can let you further fine-tune the system blending the small
9 pin tubes and medium 8 pin tube sound. This could be the world's
first pre-amp which can have this type of superb flexibility. Any
future products offered by other manufacturers should be just inferior
By using the correct
tube combinations to match the rest of your system, this unit should
easily surpass competitor offerings. With the ultimate flexibility
in fine-tuning, the better your opportunity to approach perfection.
You will find those other pre's in the market with their inflated
prices can't give you any flexibility to alter the tonal quality.
Their boasts of superiority seem like empty promises.
This pre-amp uses
the purest "ORGANIC" design, no negative feedback, no circuit board(
PCB), no transistors, all component-to-component hand wiring with
very high grade and musically selected components. Fully balanced
input and output capability as well as single-ended operation.
The above photo
set is the standard version in a silver metallic MDF chassis.
Now available is
a super rectifier tube up-grade for the rectifier section. This super
rectifier can greatly enhance the dynamics, high and low frequency
extension, and bass punch. A stand-by switch for pre-heating of rectifier
tubes ensures the longest operation lifetime. (Rectifier tubes are
replaceable with high quality ceramic sockets installed).
Feedback from Ralph: (UPRE-101 with built-in STR-104)
I've only played a few pieces from my lp collection. Cannot believe the sound of this preamp! Biggest improvement I think I've ever heard from any system upgrade.. and that's from over 48 years of being a 'stereo/phono' hobbyist. I've got items in my system that cost over twice what I paid you for this pre, and none of those did Not make near the difference when I first implemented them ... from what I am hearing now with your preamp. The 866 make huge sound, sharp, clear, just cuts through the foggiest recordings, like a thermite torch! Just like you told me!
Of course I am using all other tubes as received from you. No need to start any tube rolling this year, lol, certainly not from how good the sound is with your tubes.. just sounds too good to mess around with any changes; what would be the point?